American Magnetics 160 Liquid Helium Level Superconducting Dipstick - Manual (Page 3)

binder clip. Very slowly raise the dipstick until the audible signal is heard and the red
ALARM LED illuminates indicating the sensor is slightly above the surface of the liquid
helium. Mark the position with a second binder clip.
NOTE: The dipstick can be raised and lowered much faster
than the response time of the instrument. Therefore, in order to
assure the most accurate reading the dipstick should be slowly
lowered and raised at the liquid interface two or three times or
until a very small movement causes the audible signal to turn on
and off.
5. Place the toggle switch in the OFF position to de-energize the instrument.
6. Remove the dipstick, measure the distance between the two binder clips and use the
conversion charts provided on the helium container.
NOTE: Be sure to turn the power off when not in use. Failure
to do so will result in a short battery life.
CAUTION: Do not bend, flex or impact a cold sensor or
extension tube. While cold, the sensor and tube are very brittle
and may be damaged unless handled carefully.
V. MAINTENANCE
The Model 160 will provide years of useful service if operated in accordance with these
instructions. The only maintenance required is replacement of the battery when a low power
condition is indicated (see Section IV, Item 1, Note).
BATTERY REPLACEMENT-
1. Open the battery compartment on the back of the unit by sliding the compartment door in
the direction indicated. Lift out and unclip the battery.
2. Replace the battery with a Duracell MN 1604 or equivalent commercially available
battery.
3. Replace the cover and briefly turn the toggle switch to the GAS DETECT position and
ensure the red ALARM LED and the green POWER LED is illuminated and the audible
alarm is sounding.
NOTE: The sensor and extension is a sealed unit and internal
repair or service is not feasible. Replacement sensors are
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Rev. 4/28/2003