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Changing heater/temperature sensor
There is a heater fixed on the cap of the cryo tank.
The heater sticks into the cryo tank and heats up the liquid nitrogen inside
to generate cold flow. When you get too low a tank pressure (shown on the
control station), the heater might be bad if there is no leak. It's trivial
to change the heater except that you'll have to be careful with its connection
because the wire of the heater is in a special bentable metal hose, made
such a way that one can't turn it freely. Undo the nut of the heater rod
sticking the tank cap. When you do so, make sure not to twist the wire too
much. Also, this wire is bundled with the wire of the tip temperature sensor.
You need to figure out a way (it can be done) to completely undo the heater.
Then just pull it out the tank and change for a new one. Same caution applies
to changing the temperature sensor, which can be pulled out from the nozzle
tubing after undoing the nut at the top.
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