APTech Series VS1000 - Manual (Page 8)

VS1000 Manual P/N 00-15000009 Rev 0
Page 8 of 8
6. TROUBLESHOOTING
The most common problem conditions and possible causes/corrections are described below. Please
contact the factory for assistance with other problem conditions.
6.1. Leak
Possible causes:
Connection not assembled properly with Teflon tape.
Connection not tightened properly.
Inspect equipment to determine the source of the leak. If the leak is from the bonnet of the regulator, then
AP Tech recommends that the regulator be sent back to the factory for repair. Repair other leaks by
disassembling the connection, inspecting parts, and reassembling using good shop practice.
6.2. Process fluid is not being vaporized
Possible causes:
Steam supply is shut off.
Steam heat is not sufficient to vaporize the process fluid or process gas flow rate is too high for heat
transfer rate from steam tube.
A number of factors can contribute to this problem such as inlet pressure, delivery pressure, regulator
insulation, process line insulation, and process gas thermodynamic properties that are too complex to
describe in this manual. Please contact the factory to discuss a particular application.
6.3. Loss of outlet pressure
Possible causes:
Process fluid source is shut off.
Regulator stem is adjusted fully counterclockwise.
Contamination is restricting the process fluid flow.
6.4. Unstable outlet pressure
Possible causes:
Contamination is on the regulator internal parts (poppet or seat).
Equipment being supplied by regulator is starting and stopping flow.
6.5. High outlet pressure
Possible causes:
Contamination is on the regulator internal parts (poppet or seat).
Liquid is forming in process delivery line and vaporizing.