Ametek 931S

6-52 | Model 931S / Model 932S UV Analyzers
Decimal Alarm
Bit Value Type Alarm Condition / Description and Suggested Corrective Action
6 64 Fault f: Low ow detected
A low sample gas ow has been detected. This alarm will be delayed by the time
(seconds) entered in the Flow Switch Alarm Time Delay eld on the Alarm
Setting and Stream Switch Parameters dialog box.
Note: This alarm is used only by analyzers equipped with the optional ow
switch.
This alarm can be factory-set as a Warning or a Fault from the Alarm
Type eld in the Alarm Setting and Stream Switch Parameters dialog
box, based on customer requirements. A Fault indicates a serious failure
has been detected and the data is not valid – the analyzer will switch
the sample system to shut-in/o mode. For a description of this alarm
if congured as a Warning, refer to the w: Low ow detected alarm
description earlier in this section.
Corrective Action:
• Check the probe valves to ensure they are open.
• Check the sample system to ensure there is adequate ow and there are no
plugs.
• If your system uses an aspirator to move the sample gas, adjust the aspirator
air to ensure a proper ow rate, as indicated on analyzer drawings.
Also, check the aspirator air line for damage or bends.
• Check the ow switch for plugs and/or for an open circuit.
Take appropriate safety precautions, open the Upper Enclosure, and:
• Check the Micro-Interface board by simulating the low ow switch output.
Setup (tab)Alarm/
Stream Switch