液態氮充填程序說明液態氮充填程序說明液態氮充填程序說明液態氮充填程序說明

LiquidLiquidLiquidLiquid Nitrogen refilling procedure Nitrogen refilling procedure Nitrogen refilling procedure Nitrogen refilling procedure

注意注意注意注意!!!!

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接近磁場時請勿持有磁性物質接近磁場時請勿持有磁性物質接近磁場時請勿持有磁性物質接近磁場時請勿持有磁性物質, , , , 信用卡信用卡信用卡信用卡, , , , 磁性儲存媒體磁性儲存媒體磁性儲存媒體磁性儲存媒體, , , , 手錶等手錶等手錶等手錶等....

裝有人工心臟及心率調整器者請勿接近磁場五高斯範圍內裝有人工心臟及心率調整器者請勿接近磁場五高斯範圍內裝有人工心臟及心率調整器者請勿接近磁場五高斯範圍內裝有人工心臟及心率調整器者請勿接近磁場五高斯範圍內....

WARNING!WARNING!WARNING!WARNING!

(A(A(A(Any ny ny ny metallicmetallicmetallicmetallic materials around the magnet will become a projectile and may cause serious materials around the magnet will become a projectile and may cause serious materials around the magnet will become a projectile and may cause serious materials around the magnet will become a projectile and may cause serious

injinjinjinjuries. DO NOT bring any metallic materials (e.g. magnetic uries. DO NOT bring any metallic materials (e.g. magnetic uries. DO NOT bring any metallic materials (e.g. magnetic uries. DO NOT bring any metallic materials (e.g. magnetic card, credit cards, metal card, credit cards, metal card, credit cards, metal card, credit cards, metal

parts, watchesparts, watchesparts, watchesparts, watches etc.) when working near the magnet. Patient with artificial heart or etc.) when working near the magnet. Patient with artificial heart or etc.) when working near the magnet. Patient with artificial heart or etc.) when working near the magnet. Patient with artificial heart or

pace maker should not come near the 5 gauss line.) pace maker should not come near the 5 gauss line.) pace maker should not come near the 5 gauss line.) pace maker should not come near the 5 gauss line.)

液態氮 LN2 充填作業之目的在於將磁體保

溫並防止液態氦 LHe 揮發率過高, 正常使

用下, 液態氮需於每 14 天內或液氮液位計

讀值 1 變為 0 時進行進行充填作業, 每次

液態氮需求量約 51 公升.

The purpose of refilling liquid N2 is

to maintain the temperature of the

magnet and to prevent the boil off

rate of liquid He too high. In normal operation, refilling is done every

14 days or when the liquid N2 monitor reads from 1 to 0. Each filling

require 51 L of liquid N2.

為了能安全快速的充填, 請於充填前將液

氮桶的壓力由 VENT 處釋放至 20PSI 以下

For a safe and fast refilling, release the pressure of the liquid N2 dewar

to below 20 psi through the VENT valve.

液態氮充填前要先將防震磁腳的氣壓降低.

Reduce the pressure of the anti-vibration supply gas before refilling.

防震磁腳氣源開關正常時壓力顯示值為 80psi 順時針轉動可加壓當要進行液氦

及液氮充填時逆時針針轉動可減壓要減壓至 30psi

Anti-vibration regulator nominal pressure is 80psi

Turn clockwise to increase pressure. During refilling of liquid He or N2, turn the regulator counter clockwise

to decrease to 30psi.

移除磁鐵上黑色散熱座, 將橡膠軟管

一端連接於液態氮桶上的液態氮出口

另一端連接於磁鐵液態氮充填入口.

Remove the black heatsink. Connect

one end of flexible tubing to the

liquid N2 dewar outlet and the other

end to the liquid N2 inlet of the

magnet.

移除磁鐵液氮桶上安全洩壓閥並裝上

短的橡膠軟管.

Remove the liquid N2 safety valve of

the magnet and connect a short

flexible tubing.

安全洩壓閥 黑色散熱座

safety relief valve black heatsing

所有管路連接圖如下:

Connection as shown below:

打開液氮桶上 liquid 出口控制閥使液

氮開始流向磁鐵, 此時可觀測到液位計

上的讀值開始上昇.待液氮由橡膠軟管

流出時關閉液氮桶上 liquid 出口控制

開關完成液氮充填作業.

Open the outlet valve of the

liquid N2 dewar to let liquid N2 flow

into the magnet. Observe the value

at the liquid N2 monitor increases. Fill until liquid N2 spill out of the

outlet of the magnet. Close the outlet of the dewar to stop the filling

procedure.

完成液氮充填作業後, 取下液氮傳輸軟管, 裝回黑色散熱座及安全洩壓閥, 完

成作業.

After finish the liquid N2 refill process, remove the liquid N2 transfer

tube then put back the black heatsink and liquid N2 safety valve to

complete this procedure.