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INSTALLATION

Assemble the adapter nut into the well and tightensecurely. (See Figure 3.)

Before installing the Bimetal Dial Thermometer into

the adapter and well, coat the lower 3 section of thethermometer with a layer of heat conducting medium.This will improve the temperature response of thethermometer.

The metal liner is then slipped over the end of thethermometer stem and a coating of heat conductingmedium is applied to the outside wall of the liner.

The thermometer and the liner are then inserted intothe well and tightened in position. Do not tighten morethan is necessary to prevent the thermometer fromturning.

Where service temperatures exceed 350F the heat

conducting medium may smoke when first subjectedto a high temperature.This is caused by the vehicle, inthe heat conducting medium, vaporizing and leavingthe dry solids behind. This should not be cause foralarm. The dry solids will act equally well as a heatconducting medium for temperatures up to 1000F.

The Type 91 Series Adapter Sets were designed toprovide a simple means of installing a bimetal dialthermometer into an existing industrial glass ther-mometer well.

The adapter set consists of:1. A metal liner and spring assembly.2. An adapter nut.3. A small supply of heat conducting medium.

METHOD OF SELECTING THE SET

The Adapter Sets are available in four different sizes,to cover various depths of wells. The Selection Chartshows the Adapter Set number and the Bimetal DialThermometer stem length to use for any well depthfrom 358 up to 2518.

To select the proper Adapter Set and Bimetal DialThermometer stem length, measure first the well

depth by inserting a pencil, or any small diameter rodor stiff wire until it reaches the bottom. (See Figure 1.)Be sure the rod does not hang up on any shoulderinside the well. Using your thumb as an index, with-draw the rod and measure the distance from the endof the rod to the index point. (See Figure 2.)

Then use the chart to select the Adapter Set and theBimetal Dial Thermometer stem length to fit the well.

Note that one stem length of thermometer covers severaldifferent well depths by using the correct Adapter Set.

For example, a thermometer with a 9 long stem canbe used for well depths between 718 and 1018, bychoosing the correct Adapter Set.

The liner is tapped with a 516 - 18 machine thread so itcan be removed from the well if desired.

Figure 1

Figure 2

WELLSTEM

DEPTH ADAPTERLENGTH

I N S ET N O.S

INCHES

3

491B

4

91A

5

91C

691B 6

91A7

91D

8

91C

99

91B

91A10

WELLSTEM

DEPTH ADAPTERLENGTH

I N SE T NO .S

INCHES

10

91D

11

91C

1212

91B

91A

13

91D

14

91C

1515

91B

91A16

91D

1718

91C

18

WELLSTEM

DEPTH ADAPTERLENGTH

I N SE T NO .S

INCHES

1891B

1891A

19

20

21

22

91D

23

91C

2424

91B

91A25

Figure 3

SELECTION CHART

Note: If the measured welldepth falls on the dividing linebetween two stem lengthsand/or two Adapter Sets choosethe stem and/or Adapter Setabove the line.

INSTALLATION AND MAINTENANCE

INSTRUCTIONS FOR ASHCROFT

TYPE 91 SERIES ADAPTER KIT

2007 Ashcroft Inc., 250 East. Main Street, Stratford, CT 06614-5145, USA Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.comAll sales subject to standard terms and conditions of sale. I&M008-10004K-11/05 AMR

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CAUTION:

Bimetal Thermometers operating below freezing musthave a perfectly tight case to prevent entrance of moisturewhich eventually will condense and freeze inside the stem.This condition shows up as a failure of the thermometer toread accurately below 32F or 0C. For this reason it is

important to avoid damage to the glass front while thestem temperature is at freezing or below. All thermometersare hermetically sealed in a dry atmosphere at the factoryand require no further maintenance.

CAUTION: Thermowells should be used on all pres-surized applications, to protect the thermometerfrom corrosion or physical damage, and to facilitateremoval of the thermometer without disturbing the

process.

TESTING

Ashcroft Bimetal Dial Thermometers are carefully cali-brated at the factory and under most operating condi-tions will retain their accuracy indefinitely. However, asin the case of all instruments, it is well to make period-ic checks for accuracy against known standards.

ADJUSTMENT

If it is necessary to make an adjustment to the ther-mometer proceed as follows:

On thermometers fitted with an External Adjustment

Use a small wrench, small screwdriver or a coin toturn the slotted hexagon head in the back of the caseuntil the pointer indicates the proper temperature onthe dial.

MAINTENANCE OF

DIAL THERMOMETERS

Aside from occasional testing, little or no maintenanceis required.

Be sure that the gasketed glass cover is on the case atall times, as moisture and dirt inside the case will even-tually cause the thermometer to lose its accuracy. (Seecaution note below.)

If the thermometer is used for measuring the tempera-ture of a material that may harden and build up aninsulating layer on the stem, the thermometer shouldbe removed from the apparatus occasionally, and thestem cleaned. Observe this precaution to ensure thesensitivity of the instrument.

GENERAL

In removing the thermometer out of the packing box,handle it by the case or case outlet. Avoid handling it bythe stem.

INSTALLATION OF THERMOMETERS

The thermometer should be mounted at any convenientlocation where it will be subjected to the average tem-perature variations to be indicated.

Avoid bending the stem as this will cause misalignmentof the internal parts, resulting in undue frictional errors.

To tighten the thermometer to the apparatus, use awrench applied to the hexagon head of the threadedconnection located just outside of the case.

INSTALLATION

Locate the stem so that at least two inches will be sub-jected to the average temperature to be measured.

Exposing the stem to a temperature in excess of thehighest dial reading should be avoided.

The thermometer is normally provided with a threadedconnection. To tighten the thermometer to the appara-tus or into the well, use an open-end wrench applied tothe hexagon head of the threaded connection.Turn untilreasonably tight, then tighten still further in the samemanner as a pipe elbow or similar pipe fitting until thescale is in the desired position for reading. DO NOTTIGHTEN BY TURNING THE THERMOMETER CASE.Install the dry type thermometer so that the maximum

case temperature is kept below 200F at all times.Install the liquid filled type thermometer so that themaximum case temperature is kept below 150F at alltimes.

When a thermometer is equipped with a well, the wellshould be installed onto the apparatus first. The stem ofthe thermometer should then be coated with a heatconducting medium (a mixture of glycerin and graphiteor vaseline or any other heavy lubricant may be used),after which the thermometer stem is inserted, and tight-ened into the well.

XC2 INSTALLATION

The XC2 variation meets the NSF/ANSI standard 2(2002E) guidelines for non-exposed applications.Please refer to the NSF guidelines for certified installa-tion instructions and approved materials.

INSTALLATION AND MAINTENANCE

INSTRUCTIONS FOR ASHCROFT

BIMETAL DIAL THERMOMETERS

2007 Ashcroft Inc., 250 East. Main Street, Stratford, CT 06614-5145, USA Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com

All sales subject to standard terms and conditions of sale. I&M008-10004K-11/05 AMR