Ametek 931S, Operator'S Manual

Page: 236 / 268

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 flow detected
A low sample gas flow has been detected. This alarm will be delayed by the time
(seconds) entered in the Flow Switch Alarm Time Delay field on the Alarm
Setting and Stream Switch Parameters dialog box.
Note: This alarm is used only by analyzers equipped with the optional flow
switch.
This alarm can be factory-set as a Warning or a Fault from the
Alarm
Type
field 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/off
mode. For a description of this alarm
if configured as a Warning, refer to the
w: Low flow 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 flow and there are no
plugs.
•
If your system uses an aspirator to move the sample gas, adjust the aspirator
air to ensure a proper flow rate, as indicated on analyzer drawings.
Also, check the aspirator air line for damage or bends.
•
Check the flow 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 flow switch output.

Setup (tab)

Alarm/
Stream Switch