data sheet probes fa - 한백교역€¦ · · 2016-05-26data sheet probes fa vane wheel flow...

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Data Sheet Probes FA Vane Wheel Flow Sensors + Accessories

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Vane Wheel Flow Sensors FA

Prices for adapter cable on request. An adapter cable may be necessary when using probe extension tubes should the appropriate plug for connection to the evaluation unit not fit through the probe extension tube.


Cylindrical probes The following standard prices apply to cylindrical probes with handle

Art. no

v-Sensor

Probes of an exact length Ø14/15 mm

ZS14/15-110GA-mc40/100/p2 B005/011

ZS14/15-360GA-mc40/100/p2 B005/013

Extendable probes Ø18 mm

ZS18GE-mc20T/100/p10 B005/112

ZS18GE-mc20T/240-2/p10 B005/115

ZS18GT-mc20/100/p10 B005/412

ZS18GT-mc20/240-2/p10 B005/415

Extendable probes Ø25 mm

ZS25GA-mn20/140/p6 B002/000

ZS25GE-mn20/100/p10 B002/100

ZS25GE-mn20/260-2/p10 B002/112

ZS25GE-mn20/370-2/p0 B002/124

ZS25GE-mn20/450-2/p0 B002/132

ZS25GE-mn20/500-2/p0 B002/136

ZS25/27GE-mn20/370-2/p6 B002/140

ZS25/27GE-mn20/450-2/p6 B002/148

ZS25/27GE-mn20/500-2/p6 B002/152

ZS25GT-mn20/100/p10 B002/400

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Cylindrical Probes ZS = Cylindrical probes FT = Cylindrical probes with PT100 ZSR = Cylindrical probes sensing ± direction of flow

Cylindrical probes

Art. no

v-Sensor

Extendable probes Ø 30 mm

ZS30GA-md20/140/p6 B014/000

ZS30GE-md20T/100/p10 B014/100

ZS30GE-md20T/260-2/p10 B014/101

ZS30GE-md20T/350-2/p10 B014/102

ZS30GT-md20/100/p10 B014/300

Probes of an exact length Ø 16 mm

sensing + direction of flow

ZSR16/16-340GA-mc20/100/p3 B005/500



ZSR25GA-mn20/140/p6 B002/500

ZSR25GE-mn20/100/p6 B002/504

ZSR25GT-mn20/100/p6 B002/508

ZSR25GT-mn20/240-2/p6 B002/516

Extendadble probes Ø 30 mm


ZSR30GA-md20/140/p6 B014/500

ZSR30GE-md20T/100/p6 B014/501

vt-Sensor

Vane wheel flow sensor with integrated temperature sensor PT100 4-wire configurated


FT25GA-mn20/140/p3 B002/600

FT25GE-mn20/100/p6 B002/604

FT25GE-mn20/260-2/p6 B002/608

FT25GT-mn20/100/p6 B002/612

FT25GT-mn20/260-2/p6 B002/616

Extra charge for other

models Please pay attention to our delivery range (see page 4)

Art. no

Ex design in protective system

ATEX Ex ia IIC T6 ATEX Ex ia IIC T4 für HFA-Ex

FAEX1 FTEX1

Special cable lengths

Standard price FAKL

for probes designed for 100 °C or 140 °C or behind cable amplifier, longer than standard length

for each additional meter FAKL_M100

for probes designed for 240 °C or 260 °C, longer than standard length


for probes designed for 350 °C ... 450 °C, longer than standard length


for probes designed for 500 °C, longer than standard length


Probe extension tubes VS = extension rod SR = probe tube (for use with probe guide pieces)

Art. no

VS16A-350 B099/000

VS16E-350 B099/001

VS18E-350 B099/002

VS25A-350 B099/003

VS25A-1000 B099/004

VS25E-350 B099/005

VS25E-1000 B099/006

SR18E-400 B099/500

SR27E-400 B099/502

SR27E-1000 B099/503

SR27E-400/ Pure graphite seal B099/506

SR27E-1000/ Pure graphite seal B099/507

VS30A-350 B099/007

VS30E-350 B099/008

VS30E-1000 B099/009

SR32E-400 B099/504

SR32E-1000 B099/505

Direction Indicator RZ ..... B099/9xx

Probe guide pieces SF.... SFZ = SF probe attachment with collet chuck SFS = SF probe attachment by cutting ring fitting SFB = SF probe attachment by clamping bush

VS 16 A-350 SR 27 E-400

Type of extension tube

Diameter of extension tube in mm

Material

Rod length

Seal material

Art. no

SFZ 18 E-200 / G1“ ZG21) B004/200

SFB 25 E-54 / G1 1/4” ZG54) B004/510

SFK 25 E-100 / G2” ZG23) B004/210

SFB 25 E-70 / F-DN50 PN16 ZG15) B004/110

SFZ 27 E-220 / G1 1/4” ZG21) B004/202

SFZ 27 E-220 / G1 1/2” ZG21) B004/203

SFB 27 E-70 / F-DN50 PN16 ZG12) B004/102

SFB 27 E-50 /G1 1/4“ ZG54) B004/502

SFZ 27 E-240 / F-DN50 PN16 ZG31) B004/302

SFB 30 E-50 / G1 1/2” ZG54) B004/508

Seal materials ® DuPont trademark

1) VITON® O-Ring,

2) TEFLON®

3) VITON® lip seal

4) VITON® , PTFE clamping bush 5) Graphite

ZS25/27 GF E-mn40 /370- 2/ p6

FT30 G E-md20 T/100 / p6

Sensor

Probe diameter

in mm

Diameter in mm

from sensor

Medium

G = air/gases

F = Water/liquids

Probe material

A = aluminium

E = stainless Steel

T = titanium

Typ of vane wheel

Vane wheel material

Working temperature range

Length of cable in m

up to cable amplifier

Working pressure above

Atmospheric

SFZ 18E-200/G1” ZG2 SFB 20E-65 /F-DN50PN16 ZG1 Type of probe Guide piece

Through hole Ø in mm

Material SF E=stainless steel

Installation length L in mm

Connection F = Flange G = Thread

Design of drawing ZG...


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Probes

Probe guide pieces SF

SFZ SF Probe attachment with collet chuck for any repeated positioning at subatmospheric / above atmospheric pressures of up to 10 bar SFB SF Probe attachment by clamping bush for any repeated positioning at lower subatmospheric / above atmospheric pressures SFS SF Probe attachment by cutting ring fitting for non-recurring positioning at higher subatmospheric / above atmospheric pressures and higher temperatures

Drawing 1 Drawing 2

G1 ¼ G 1

Drawing 3

Drawing 5

G 1 G 1 ¼

Measurements A ... D: see page 4

240 °C

.....

500 °C

Cable amplifier

Sensor Handle Probe extension

Drawing 1

Drawing 2

Drawing 3

Thread

Thread

Thread

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Höntzsch GmbH Gottlieb-Daimler-Straße 37 D-71334 Waiblingen (Hegnach) Telephone 07151/1716-0 Facsimile 07151/5 84 02 eMail [email protected] Internet www.hoentzsch.com

Subject to alteration

Other models available on request

Type of sensor ZS 14

ZS16

ZS18 ZS25 ZS30 ZSR 16

ZSR25 ZSR30 FT25 FT30

Medium G: air/gases GA • • • • • • •

F: water/liquids GFA • • •

Sensor material: GE • • • • • • •

A = aluminium GFE • • • • • • • E = stainless steel GT • • • • • •

T = titanium GFT • • • • • •

Probe diameter in mm 14 •

16 •

18 • • • •

25 • • • • • • • • • • • • • • • • • •

3L = 3 conductors 30 • • • • • • • • • • • • • • • • G:0,6-20 F:0,06-7,5 mc20A •

Measure- 0,6-40 0,06-10 mc40A • •

ing range 1,2-80 mc80A

In m/s, 1,4-20 mc120A

type of 0,8-20 0,08-7,5 mc20T • • • •

vane 1,0-40 0,1-10 mc40T • • • •

wheel, 1,6-80 mc80T • •

material, 0,3-20 0,03-7,5 mn20A • • • •

medium 0,4-40 0,04-10 mn40A • • • • • •

G: 0,8-80 mn80A • • •

air/gases 1,2-120 mn120A • • •

F: 0,4-20 0,04-7,5 mn20E • • • • • •

water/ 0,5-40 0,05-10 mn40E • • • • • •

liquids 1,0-80 mn80E • • •

1,4-120 mn120E • • •

0,3-20 0,03-7,5 mn20T • • • • • •

0,4-40 0,04-10 mn40T • • • • • •

0,8-80 mn80T • • •

1,2-120 mn120T • • •

0,2-20 0,01-3 md20A • • • • • •

0,3-20 0,01-3 md20T • • • • • • • • • • 100 • • • • • • • • • • • • • • • • • • • • • • • • • • • • 140 • • • • • • • • • • • •

Working temperature, 240-2 • • • • • • • • • • • • • • • • standard length of cable in m 350-2 •

up to cable amplifier 350-2 3L

370-2 •

3L = 3 conductors 450-2 3L •

500-2 3L •

240 4 4 4 4 6 6 6 6 6 6 4 4 4 4 4 4 4 4 4 4 4 4

Max. length of cable in m 240 3L 6 6 6 6 8 8 8 8 8 8

up to cable amplifier 350 5

350 3L

3 L = 3 conductors 370 6

450 3L -10

500 3L 4

P0 • • • •

Max. working pressure in bar, P2 •

(1 bar = 100 kPa) P3 • • • • •

Impermeability P6 • • • • • • • • • • • • • • • • • • • • • • • • P10 • • • • • • • • • • • •

Protective system Ex ia IIC T6 Ex • • • • • • • • • • • • • • • • •

Protective system Ex ia IIC T4 Ex • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Design as drawing ZG.... ZG1 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • In conventional design ZG2 • •

ZG3 • • • •

Measure-

ments 3 3 4 4 5 5 5 5 1 1 2 2 2 2 7 7 7 7 7 7 8 8 9 9 9 9 7 7 7 7 7 7 6 6 2 2 2 2 7 7 7 7

cable for 450 °C on probe from 11/2001 with strain relief, twist-proof

contain POLYIMIDE which comes into contact with the medium: not ammonia resistant! Probes with PVDF are available, but only resistant up to +100 °C

connection cable water-protected:

available as option -10 from 6m half measurement range of the nominal value

Measurement in mm Meas. ZG.... Connec- tion thread

Sensors

A B C D

18,2 13,4 60 170 1 1 M 22 x 1,5 ZS25

18,2 14 81 170 2 1 M 22 x 1,5 ZS25 + FT25

9,7 11 65 163 5 3 M 16 x 1,5 ZS18

18,2 13,4 60 160 6 1 M 22 x 1,5 FT25

24 18 90 170 7 1 M 26 x 1,5 ZS30+ZS30+FT25

18,2 13 66 166 8 1 M 22 x 1,5 ZSR25

18,2 13 66 154 9 1 M 22 x 1,5 ZSR25

18,2 13,4 48 315 2 2 M 22 x 1,5 ZS25/27

http://www.hoentzsch.com U117_FA_D_e_100726 1/8

Vane Wheel Flow Sensors FA 07/2010 Probes ⋅ Probe Extensions ⋅ Probe Guide Pieces ⋅ Measuring Tubes

Flow · Flow rate Also combined with temperature · Pressure

Specifications Designs Information for the user


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The principle of measurement is based on the fact that a vane wheel rotates at a speed propor-tional to the flow velocity v of a fluid into which it is immersed. The rotational speed is almost independent of density, pressure and temperature of the medium. The sensing of the vane wheel rotation is carried out by an inductive proximity switch. By fitting a further inductive proximity switch, sensing of the direc-tion of the vane wheel rotation and the indication of the ±direction of flow is made possible. This form of measurement of rotational speed is carried out without the slightest braking effect on the vane wheel. Soilage does not effect the impulse re-cognition. The light weight of the vane wheel makes it most suitable for adapting its rotational speed in millisecond range to intervening velocity changes. All vane wheel flow sensors are calibrated on the same frequency, so that sensors of the same type are interchange-able.

The length of cable between sen-sor and electronic evaluation unit can measure up to several hun-dred meters. Types of sensor with vane wheel • v-sensors for measuring the flow velocity v • vt-sensors for measuring the flow velocity v and also the temperature t • v-sensors for sensing the ±direction of flow: FAR • v-sensors FA/FAR also in protective system Ex ia IIC T6 Ex • vt-sensors FT for HFA-Ex also in protective system Ex ia IIC T4

Designs • cylinder probes with Ø from 14/15 mm • cylinder probes with Ø from 16 mm also sensing ±direction of flow • cylinder probes with Ø from 25 mm also as vt-sensors • probes of fixed length and extendable probes

Measuring tubes FA·Di... for direct, independent of position, stationary installation in pipelines with inside diameters Di from 9.7...150 mm. Measuring tubes

Probe ZS 18 GE


Probe FT

FA Di... are designed for the smallest possible blockage. Tube connection by flange, cutting ring fitting, pipe fitting, connecting nipple, etc.

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Customer-specific designs, special designs

T-probes and T-probes with cone for higher indifference to indirect oncoming flow

and others, for example cylinder probe with integral flange as well as lapped flange cylinder probes ZS25 or ZS30 with integrated transducer


Cylinder probe with protective mesh for measuring water velocity up to max. 1.5 m/s

Cylinder probe with 90° elbow Cylinder probe of an exact length with connector box

T-probe withvery small size, 16 mm long, shaft diameter 8 mm, sensing ±direction of flow

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Types of sensor ZS cylinder probe, v-sensor FA ZSR cylinder probe sensing ±direction of flow, v-sensor FAR FT cylinder probe with integrated temperature sensor Pt100, Flowtherm sensor, vt-sensor: v-sensor FA t-sensor Pt100, DIN IEC 751, tolerance class B, 4-wire configurated

Probe diameter Ø Ø14/15, Ø16, Ø18, Ø25 or Ø30 mm Probe tube diameter from sensor in mm The description of a conical expansion on the handle or on the probe tube directly screwed on to the sensorcan be found in the sensor identification (e. g. ZS25/27...), handle identification HG (e. g. ZS25G... + HG25/27...) or probe tube identification SR (e. g. ZS16G... + SR16/18E...). The conical expansion protects the sensor during feed through the through hole of a probe guide piece; besides this increased demands on impermeability and maximum working pressures can be met.

Should details of the conical expansion be missing then probe extension and sensor have the same diameter. Medium G air/gases GF water/liquids and air/gases Vane wheel flow sensors FA are primarily intended for measure-ments in single-phase flow streams. Slight medium impurities, especially the usual dust content in the air, are of no impairment to the fatigue stren-gth for infinite time. When mea-suring gases with a solids content a reduction in the fatigue strength of the vane wheel axle tips must be reckoned with depending on type and quantity of the solid particles. Likewise moisture in gases is of no disadvantage, as long as con-densation does not set in. In the case of slight condensation a self-cleaning effect can be reckoned with, as long as the velocities are greater than 10% of the nominal value. Drops of condensationmust not come in to contact with the vane wheel. Höntzsch vane wheel flow sensors are calibrated in air. GF sensors calibrated in air can also be used

for measuring in liquids, as research has shown that in the case of measurements in water the sensor characteristic which is deposited as a straight line simply causes parallel shift. GF commutable evaluation units take into account the respective corresponding characteristic. When measuring in liquids with a viscosity greater than 10 cSt or less than 1 cSt measured value divergencies must be reckoned with. Nevertheless, positive experience has been made, for example, when measuring with fuel. In all cases the mediums must not contain fibres.

Sensor materials A aluminium E stainless steel, antirust and acidproof T titanium The material reference given to a sensor is the principal material used. Vane wheel material As a rule a vane wheel is made of the same material as that referred to in the sensor identification. Should another material be used for the vane wheel then this material will be referred to separately in the sensor identification. The vane wheels in Höntzsch vane wheel flow sensors are pivot suspended. The materials used for vane wheel axes and jewel bearings guarantee highest quality with regard to fatigue strength for infinite time, temperature stability and corrosion resistance. Axes: sintered hard metal Stones: synthetic sapphire


Probe ZS25/27

ZS25/27 GFE-mn40 /370-2/p6/Ex FT30 G E-md20 T /100 /p6

Sensor

Probe diameter in mm

Diameter in mm from sensor Medium G = air/gases F = water/ liquids

Probe material

A = aluminium E = stainless steel T = titanium

Type of vane wheel

Vane wheel material

Working temperature range

Length of cable in m up to cable amplifier

Working pressure above atmospheric

Protective system

Type of vane wheel / Measuring range The vane wheels differ in sizemicro = mc, mini = mn, midi = md and the designated measuring range up to 20, 40, 80 or 120 m/s when measuring in air/gases (G) or up to 7.5 or 10 m/s when measuring in water/liquids (F).

The measuring operation only up to 25 % of the nominal value should also be favoured in contin-uous use when the temperatures of the medium continually exceed +300°C. Probes with a midi vane wheel should only be put into continuous use when the velocity lies in a range of up to 20% of nominal value.

vspezif0

vreal0, ,

kg m 31 2, /≅

realρ

Working temperature range 100 -20 °C ... +100 °C C also -30 °C ... +100 °C C 140 -20 °C ... +125 °C C also -30 °C ... +140 °C S 240 -20 °C ... +240 °C C -25 °C ... +240 °C S 260 -40 °C ... +260 °C C -40 °C ... +300 °C S also 260 0 °C ... +260 °C C 0 °C ... +300 °C S 350 -40 °C ... +350 °C C -40 °C ... +400 °C S 370 -40 °C ... +370 °C C -40 °C ... +400 °C S 450 -40 °C ... +450 °C C 500 -40 °C ... +500 °C C -40 °C ... +550 °C S C = continuous operation S = short-time operation The respective sensor working temperature range is especially influenced by the internal connection system, the materials, the proximity switch, the cable as well as the seals.

Smallest measurable value, density influence The smallest measurable value for measurements in air/gases specified in our documents results from a measuring medium density ρ ≅ 1,2 kg/m³. The smallest measurable value v0 is also increased / decreased negligibly even with a considerably different medium density ρ ≅ 1,2 kg/m³ and follows in good approximation the relation

The characteristic is displaced by the difference v0, spezif - v0, real = ∆v.

Readout of measured values is too great by the amount ∆v when measuring in gases of a density of ρ

real > 1,2 kg/m³, and too small

by the amount ∆v when measuring in gases of a density of ρ

real < 1,2 kg/m³. ∆v is to be ad-

ded to or subtracted from the re-spective output value. High endurance with vane wheel flow sensors can also be attained by choosing the sensor with higher nominal value, but using it only in the range of up to 25 % of the nominal value. In such cases we recommend optimum calibration of the measuring probe up to 25 % of terminal value or the linearizing of characteristics. Case example: sensor with vane wheel mn80A, clean air at +20 °C, flow velocities 5...15 m/s; in these conditions 5 years continuous operation can be altogether expected. Of course the increased smallest measurable value resul-ting from this must be acceptable.

Measurements at temperatures for which short-time operation is specified should only last for a few minutes. If this advice is adhered to, then the measuring probe cannot be damaged.



Temperature testing facilities for Höntzsch proximity switches

In the case of vt-sensors the working temperature range corresponds to the temperature measurement range.

Cable amplifier in a bush Cable length up to cable amplifierStandard length 2 m. For example, the sensor identification 260-2 means that the sensor is resistant up to +260 °C and the length of cable between sensor and bush with cable amplifier is 2 m. Type of cable up to cable amplifierThis connection cable is TEFLON-coated for +260 °C sensors. The connection cable for the 350 °C ... 450 °C sensors is temperature resistant up to 450 °C. This cable withstands atmospheric influences; it is resis-tant to almost all chemical sub-stances and is corrosion-proof. The connection cable for the 500 °C sensors is temperature resistant up to 600 °C. This cable is not moisture-proof. Warning: frequent movement and bending of cable for 350 °C should be avoided. Observe large bending radius whenever possible. Cable after cable amplifierStandard length 1.5...2 m. SILICONE-coated and temperature resistant up to +125 °C. Sensors for +100 °C and +140 °C also have as standard a 2 m long SILICONE-coated connection cable for max. +125 °C. When ordering please name the accompanying evaluation unit so that the appropriate connector plug /connection identification can be supplied.

Continuous working temperature range at temperatures higher than +125 °C or rather lower than -30 °C is moreover achieved by the active electronic compo-nents of the proximity switch = cable amplifier being positioned at a distance from areas with high/low temperatures. The cable amplifier can be found in a bush on the sensor connection cable or in the connection housing. Permissible temperatures at the cable amplifier: -30... +125 °C. In order to keep to these regula-tions, in particular cases ambient temperature, the heat flow above the sensor connection cable or probe tube up to connection hou-sing as well as eventual thermal radiation must be paid attention to. A cable length of 0.5 m is suffi-cient between the place at which a sensor connection cable comes out of a zone of for example +350 °C up to the bush with cable amplifier, when the cable amplifier is in surroundings with tempera-tures of no more than +40 °C. Neither liquid nor aggressive gasmust be allowed to penetrate the cable amplifier.

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Seal materials are, depending on sensor, VITON®, PFTE / TEFLON®, pure

graphite. KALREZ® or SILICONE on request. Working temperature range of the seal materials: VITON® -20°C ... +240 °C C

-25°C ... +240 °C SKALREZ® 0°C ... +300 °C C PTFE/ TEFLON® -40°C ... +260 °C C -40°C ... +300 °C SPure graphite -200 °C ... +600 °C C

C : continuous operation, S : short-time operation ® : DuPont trademark

Protective system Explosion protection Exv-sensors FA and FAR are also available in protective system Ex ia IIC T6, electric circuit intrinsically safe. Protection against mediumNeither liquids nor corrosive gases must be allowed to penetrate the sensor from the cable connection side. In this respect please enquire about protected sensors, e. g. for use under water, before ordering.


Maximum working pressure p0 sensor is not tight, not pressure resistant p... sensor is structurally designed for pressures above atmospheric of up to ...bar (1 bar = 100 kPa). When necessary a leak test should be carried out. ZS25/30-200 with lapped flange

+260 °C +370 °C +500 °C

Seal materials on the screw fittings of extension tubes. The tube walls of the ex-tension tubes are as thin as possible. As a result, the sealing functions of the normally used VITON O-rings at high temperatures can only be guaranteed up to a certain limit. Extension tubes with pure graphite seals fulfill high requirements of tightness and corrosion resistance. Besides this they are also tem-perature resistant between -200 °C ... +600 °C. PTFE / TEFLON and KALREZ O-rings on request. PTFE O-rings can only be recommended if the corrosion resistance of VITON should not be adequate and the temperatures are not too high. KALREZ O-rings are temperature resistant for certain mediums, according to DuPont, in a range from 0 °C ... +300 °C.

Probe extensions are used for deeper insertion of probes in mediums, when the standard probe length is not suf-ficient for the required insertion depth. Extendable cylinder probes have, for this purpose, a con-nection thread onto which extension tubes can be fitted which are also suited for feed-through of sensor connection cable, if neces-sary bush with cable amplifier and connector plug. In addition they are protected against mediums - water or corrosive gases - which should not be allowed to penetrate the sensor from the cable connection side. Probe tubes are suitable for use with probe guide pieces, even in corrosive mediums or at high temperatures and offer a mechanically steady probe support. Probe tubes made of titanium can be manufactured only together with a complete order with the same diameter. The diameter of these tubes may differ slightly from the respective nominal dia-meter. Probe guide pieces must be manufactured to match these probe tubes. The mechanical burden of the tubes on the connection threads (burden due to weight of probe and extension tube as well as force of the flow- ing medium) limits the number of extension tubes which can be screwed together. Besides this, the sensor must not be allowed to undergo anyvibration. For the most cases we recommend that not more than 4 extension tubes of 350 mm or 400 mm in length or rather 2 ex-tension tubes of 1000 mm in length should be screwed together without additional support.

Probe guide pieces SF are used for inserting and retrac- ting probes in and out of pipelines and ducts. The fixing device of the probe tube is to be chosen taking the temperature and pressure operating conditions into conside- ration.



Probe guide piece with clamp


PF = 1.000. As a result of this examination an optimal measurement point is to be determined and the corresponding coefficient is to be set. For further information please consult VDI/VDE 2640, “Measurement of velocity area methods in flow cross-sections”.

Höntzsch GmbH P.O. Box 1324 D-71303 Waiblingen Gottlieb-Daimler-Straße 37 D-71334 Waiblingen (Hegnach) Telephone 07151/1716-0 Facsimile 07151/58402 E-Mail [email protected] Internet www.hoentzsch.com

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Measurement uncertainty Vane wheel probes ZS, TS, ZSR and TSR are specified with a measurement uncertainty of <1.5 % of measured value + 0.5 % of termi-nal value. Validity of this measurement uncertainty specification is limited for FT sensors and sensors with a measuring range terminal value value greater than 60 m/s. For these sensors, a linearising of characteristics with pairs of values is essential in order to achieve the lowest possible measurement uncertainty. An application with the standard characteristic (available in each evaluation unit with FA-input) is possible, but results in an uncertainty of <5% of measu-red value + 2 % of terminal value.

Coefficient / Profile factor In larger free jet as well as in lar-ger ducts and measuring tubes the local velocity vp will be dis-played with PF = 1.000. PF is also used to calculate the local velocity vp to the average velocity vm in a measurement cross-section:

vm = vp ⋅ PF

When measuring with cylinder probes in circular measurement cross-sections with interior dia-meter Di • centric positioning of the sensor • irrotational flow

• developed flow profile (measurement cross-section so chosen, that 20 Di straight, unhindered input section amount to 10 Di straight, unhindered output section)

following coefficients are to be taken as a basis:

Di PF (ZS16) PF (ZS18)40 0.914 0.898

50 0.933 0.916 60 0.950 0.932 70 0.964 0.948 80 0.976 0.962 90 0.987 0.975 100 0.994 0.986 120 1.004 1.004 170 1.008 1.021 180 1.008 1.021 220 1.008 1.021 ... 1.008 1.021

Di PF (ZS25, ZS30)50 0.735

60 0.760 70 0.784 80 0.807 90 0.829 100 0.849 120 0.882 170 0.935 180 0.945 220 0.955 ... 0.955


If these conditions for application of the coefficients are not prevai- ling then a pre-examination of flow should be carried out in the greater measurement cross sec-tion with

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User’s Information FA Probes

Supplementary to this User’s Infor-mation we refer to the correspondingTechnical Data Sheet with thespecific data relating to your orderand details of the Manual as well asto Data Sheets Vane Wheel FlowSensors FA and Flow VelocityCalibration FA. The data in thesedocuments supplements thefollowing User’s Information.

Fitting instructionsThe probes should be so fittedthat

In the case of probes without con-nection housing an adjustable‘direction indicator’ can be used todetermine the sensor flow directionand insertion depth.

•

•

®

Installation deviating from thenominal position

v0 = 1 m/sv0 = 5 m/sv0 = 10 m/sv0 = 15 m/s

• the probe mounting device doesnot affect the flow if possible.

• they are fitted vibration-free and notin the immediate vicinity of electro-magnetic sources of interference.

when using several probes to-gether, two probes should not beplaced in too short a distance fromeach other. A space of 1 m in thedirection of flow is always “good”;however, the space between twoprobes on the measuring planemay be 15 cm.

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• no drops hit the sensor.

Probe alignmentVane wheel flow sensors FA are to bealigned in the direction of flow.

Flow direction

ò

ñ

In the case of ZSR probes sensingthe ±direction of flow the allocation ofthe direction is to be undertaken bythe customer during initial operation.

In the case of probes with connectionhousing the screwed cable gland onthe connection housing is to bealigned to the direction of flow or thedirection indicator on the housing isto be aligned to the direction of flow.

In the case of flowtherm probes FT adirection indicator on the probe cappoints in the intended direction offlow.

• flow is according to the flow direc-tion provided for.

Alignment estimated by sightdoes not interfere with the meas-urement. Rather more deviationsfrom the nominal position canhowever affect the measurement.

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Probe in pressurized pipeline:- insertion or retraction of probe in

depressurized conditions only!- In the case of probe guide

pieces with probe attachment byTEFLON clamping bush: in-crease the tension on the clamp-ing bush from time to time(TEFLON runs causing theclamping fixture to lose initialgripping power)

Probe with probe guide piece: after positioning a probe in the pipeline fix the probe tube!

Warning

twist

twisting angle α in °

-40 -20 0 +20 +40

1.05

1.0

0.95

0.9

v /v0α

0.85

0.8

The diagram shows, taking a cylinderprobe with Ø25 mm as an example,how the measured velocity values vin a wind tunnel with uniform velocityin blower stream v0 can change bytwisting the probe. Typical of this isthat probes with a smaller diameterdemonstrate a stronger directionaldependance. On the other hand, inthe case of T-shaped probes, themeasured values v remain almostconstantly up to ≈ ±20 °, even bytwisting and tilting the probe.

α

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Greater measurement cross sec-tionsTo determine the average flow veloc-ity vm in greater measurement crosssections a preliminary examinationis to be carried out to determine theflow profile/measurement crosssection topography. As a result of thisstudy an optimum measuring pointis to be fixed and the associated co-efficient for the conversion of thelocal velocity vp to the average velocityvm to be stipulated.

For further information see forexample

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Data Sheet FA, ‘Coefficient /Profile factor’

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Result report of the Hessian StateInstitute for the Environment, ‘Envi-ronmental Planning, Protection ofLabour and Environmental ProtectionPamphlet 167’: Überprüfung derRepräsentativität von Messpunktenbei der Ermittlung der Emissionenluftfremder Stoffe unter Anwendungvon Messquerschnittstopographien,MQT-Verfahren.

• VDI/VDE 2640-3 ‘Measurement ofgas flow... velocity area method’

Input/output sectionsWhen measuring in a measurementsection of inside diameter Di it mustbe observed that optimal accuracywhen converting the local velocity vpto the average velocityvm

vm = vp · PF

(PF, CF = Profile Factor, Coefficient)is only guaranteed wheninput/output sided irrotational flowprevails and moreoversufficient straight, unhindered inputsection as well as sufficient straight,unhindered output section is avail-able.

The illustrations show the recom-mended minimum pipe length, givenas a multiple of Di. The use ofgreater lengths is always advisable.

Should a suitably long, straight sec-tion line not be available then themeasurement cross section is to beso placed that 2/3 of the straight pipesection are upstream and 1/3downstream of the measurementcross section.

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Standard designs of flow straight-eners, see for example DIN ISO5167-1 ‘Measurement of fluid flowby means of pressure differentialdevices’

upstream downstream

15·Di 5·Di

reduction

enlargement

18·Di 5·Di

90° elbowor T-form pipe

20·Di 5·Di

2·90° elbow

25·Di 5·Di

2·90° elbow3-dimensional

40·Di 5·Di

with flowstraightener

8·Di 5·Di

FA sensorðv

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in the case of a transducer withoutkeypad and display please makesure that the type of vane wheeland type of medium shown on thetransducer match the connectedsensor.

Instrument settingsin the case of an evaluation unitwith keypad and display: check theeffective parameter settings byusing the è key (inquiry mode)and if necessary enter type of vanewheel and type of medium apper-taining to the sensor via thekeypad.

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double-shielded line is recom-mended: lay inner shield on oneside of the evaluation unit, lay outershield on both sides covering alarge area and of low impedance atsensor and evaluation unit.

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In the case of lines over 30 m orlines with severe electromagneticinterference - lines between sensorand evaluation unit - the use of a

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FA sensor

RF-shielded housing evaluation unit

2...4 mx m

Connection recommendation for a FA, FT or FAR sensor with longer lines orlines with severe electromagnetic interference

Connection recommendation for a FA, FT or FAR sensor with shorter lineswith no electromagnetic interference

FA sensor2...4 m

RF-shielded housing

x m

evaluation unit

Circuit diagramFA sensor with evaluation unit only tobe connected according to appropri-ate circuit diagram.

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Connection lineFor the connection between sensorand evaluation unit - in the case ofshorter lines with no electromag-netic interference - a line with sim-ple copper shielded braid can beused: LiYCY. In the case of longerlines or lines with severe electro-magnetic interference a double-shielded line only is to be used:LiYCY-CY. Number of wires and crosssection in mm2 for each wire: forFA sensor 2 conductors 2·0.25,FA sensor 3 conductors 3·0.25,FAR sensor 2 conductors 3·0.25,FAR sensor 3 conductors 4·0.25,FT sensor 2 conductors 6·0.25.Maximum conductor resistance foreach wire: 25 Ω. Maximum operatingcapacity between the wires with 2conductors: 1.5 nF. Resistances forfine-strand wires according to VDE0295 / IEC 228:79 Ω/km with wire cross section

0.25 mm2,39 Ω/km with wire cross section

0.50 mm2,26 Ω/km with wire cross section

0.75 mm2

EMC informationfor installation in facilities withinterference emitting components:

• Special attention should be directedto the motor wire. The motor wirebetween converter and motor shouldbe shielded, the shielding being onboth sides.

• When using frequency converters theinfluence of RF interferenceemittance must be taken into consid-eration from the outset and in-creased active and passive anti-interference measures must betaken: Decouple the mains input ofthe frequency converter by means ofa spark filter against active interfer-ence emittances. In addition thisincreases the passive resistance tojamming of the facility.

• Spacial separation of lines emittinginterference from measuring cablesand evaluation units.

• Metallic parts in the service cabinet -as for instance sub-rack with controlelectronics or mounting plates - verygood large area and RF-likeconductive connection.

All lines to be kept short! Loops in theline can destroy protective measures.Lay non-reserved wires in a cable onboth sides on earthed wire potential.Lay cables and wires close to thereference potential, for instance sidepanels, mounting plates or steelgirders.

Relays, contactors, electro valves in-stalled in the same circuit to be wiredby means of spark arrester combina-tions or excess-voltage limitingcomponents.

Lay shieldings from digital signallines on both sides over a large area.In the case of potential differencesbetween these points: lay separatepotential equalization lines.

Lay the shielding from analog signallines only on one side - if possible atthe evaluation unit - and of low im-pedance. Twist non-shielded lines: iseffective against balanced interfer-ence to source terminals.

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For connections on connection cablepoints of separation use preferredshielded plug connector. When usingterminals: place terminals in an RF-shielded housing and use EMC-correct cable lead-ins. Contact outershielding of the connecting line to thecable leadins.

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Höntzsch GmbHP.O. Box 1324 D-71303 WaiblingenGottlieb-Daimler-Straße 37D-71334 Waiblingen (Hegnach)Telephone 07151/1716-0Facsimile 07151/58402


Causes of trouble

MaintenanceIn applications where dirt can set-tle on the sensor, sensor should becleaned at regular intervals!

Corrective maintenanceto be carried out by Höntzsch GmbH.Please enclose a description oferrors when returning faultyinstruments. If the instruments havebeen used in hazardous materialsplease inform us of any safetyprecautions to be taken duringcorrective maintenance. We see it asa conscientious duty to our staff torequest you to furnish us with this in-formation.

ServicePlease contact Höntzsch GmbH

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Measured value fluctuates:time constant set at too low a valueexpected measured value fluctua-tion does not correspond to theactual measured value fluctuationeffective electromagnetic interfer-ences

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other causes of troubleall parameters altered: effectiveelectromagnetic interferences. Un-like incorrect parameter settings bythe user, electromagnetic interfer-ence usually results in parametersettings which cannot be effectedby operating error. In the case ofan evaluation unit with keypad anddisplay: use the è key for param-eter inquiry. This inquiry modedoes not change the settings.expected measured value fluctua-tion does not correspond to the ac-tual measured value fluctuation:time constant set too high

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no measured value:coefficient set at 0.000sensor not connected(display EEEE or FFFF)parting of connection cable orshort in the connection cable(display EEEE or FFFF)

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Measured value too high:coefficient set too highcoefficient too high for the measur-ing position. See ‘Greater Meas-urement Cross Sections’: Flow pro-file other than expected, e.g.caused by subsequent structuralalterations to the measurementsection. Please note: the flow pro-file can change dependent on ve-locity when the input/output sec-tions are too short.volumetric display: pipe inside di-ameter Di setting too greateffective electromagnetic interfer-encessensor not optimumly aligned tothe flowwrong setting of type of vanewheel or type of fluid in the case ofevaluation unit with keypad anddisplay.

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Cleaning the sensorSoiled probes can be rinsed in acleaning agent (e.g. etyl alcohol,isopropanol or washing-up liquidwith warm water) which does notleave a dry residue. Please checkcompatibility of cleaning agent withsensor material.

The measuring probe should only beimmersed in the cleaning agent asfar as the vane wheel and its boring.On no account must liquid beallowed to penetrate the probe fromwhere the cable emerges.

An ultrasonic cleaning applianceshould not be used! After cleansing,blow through the vane wheel fromboth sides with a hair-dryer. Purpose:to achieve self-cleaning effect of axletips and bearings!

Warning: do not clean or direct air-flow against the probe with com-pressed air.

Vane wheel flow sensors should becleaned at regular intervals when be-ing used where dirt can be depositedon the sensor. Start by checking thenecessity for cleaning at short inter-vals by close inspection in order toestablish an optimal cleaninginterval.

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measured value too low:coefficient set too lowcoefficient too low for the measur-ing position. See ‘Greater Meas-urement Cross Sections’: Flowprofile other than expected, e.g.caused by subsequent structuralalterations to the measurementsection. Please note: the flow pro-file can change dependent on ve-locity when the input/output sec-tions are too short.volumetric display: pipe inside di-ameter Di setting too smallrotational flow with centric posi-tioning of the sensorsensor not optimumly aligned tothe flowvane wheel no longer smooth run-ning as a result of lengthy use,strong vibration or impact(sensor dropped, for instance)vane wheel sluggish as a result ofsoilage or worn out axle tipseffective electromagnetic interfer-encesburden at current output greaterthan permissible according toTechnichal Data Sheet. Effect: cor-rect output values in a lower part ofthe measuring range, no longerincreasing output values in an up-per part of the measuring range.setting of the scaling for the ana-log output not as expectedwrong setting of type of vanewheel or type of fluid in the case ofevaluation unit with keypad anddisplay.

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data sheet probes fa - 한백교역€¦ · · 2016-05-26data sheet probes fa vane wheel flow...

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