CHART ULTRADOSER 2K - General Trouble Shooting

General Trouble Shooting
Below are a few general trouble shooting guidelines. If after reading this section, the condition does not
change or the condition is not covered in this section, please contact Chart’s service team at +1
408.371.4932.
Condition: The safety relief valve is venting.
Possible Causes
Actions
 The pressure of the LN
2
supply is greater than 50
psi (3.44 bar).
 Check the pressure of the LN
2
supply. If the
supply pressure is greater than 50 psi (3.44 bar),
reduce the supply pressure.
**Note: A dewar can be vented to reduce the
pressure.
 The vent is obstructed.
 Check the UltraDoser unit vent. If the vent is
obstructed, clear the obstruction.
If the vent is obstructed with ice, contact Chart’s
service team at +1 408.371.4932.
Condition: Liquid is coming out of the vent.
Possible Causes
Actions
 The LN
2
supply pressure is too high.
 Lower LN
2
supply pressure to 22 psi (1.5 bar) or
lower.
 Ice has developed inside the unit, causing the
internal float valve to malfunction.
 The UltraDoser unit must be drained of liquid,
allowed to warm up over a minimum of 24 hours
with a continuous purge of warm nitrogen gas.
Contact Chart’s service team at +1 408.371.4932
for a detailed procedure.
Condition: Liquid is coming out of the dosing head even though the valve is shut close.
Possible Causes
Actions
 The LN
2
supply pressure is too high.
 Reduce the LN
2
supply pressure.
 The valve seat is contaminated (ice or particles).
 The UltraDoser unit must be drained of LN
2,
The
dosing valve assembly must be removed and
cleaned.
Contact Chart’s service team at +1 408.371.4932
for a detailed procedure.
 Air supplied to the solenoid is reversed.
 Reverse the LN
2
lines that supply and vent to the
solenoid.