Ametek 933S, Operator'S Manual

Page: 241 / 288

Maintenance and Troubleshooting
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6-65
Decimal Alarm
Bit Value Type Alarm Condition / Description and Suggested Corrective Action
6 64 Warning w: Sample gas pressure too low
The sample gas pressure is below 1 % of the full-scale range.
Note: This alarm is used only by analyzers equipped with the optional
pressure transducer.
This alarm can be factory-set as a Warning or a Fault, based on
customer requirements. A Warning indicates the data is suspect (the
analyzer requires service). For a description of this alarm if configured
as a Fault, refer to the “ f: Sample gas pressure too low ” alarm
description later in this section.
Corrective Action:
•
Check the sample gas pressure gauge and ensure that it is at an appropriate
flow and pressure, as recommended on system drawings.
• From the
Output Setup
dialog box, confirm the sample gas Low Scale and
High Scale pressure settings are correct.
• Check for leaks in the sample system (see “Sample System Leak Check” in
Chapter 3).
• Check the solenoids (backpan).
If this doesn’t correct the alarm, take appropriate safety precautions, open the
Lower Enclosure, and:
•
Check the pressure transducer.
•
Inspect the Check Valves in the Column Block Assembly for signs of wear (see
“Column Block Maintenance” in this chapter).
• Replace the Customer I/O board. Contact AMETEK to verify operation
before removing this board.
7 128 Warning w: 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 Warning indicates the
data is suspect (the analyzer requires service). For a description of this
alarm if configured as a Fault, refer to the “ f: Low flow detected ” alarm
description later 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

Setup (tab)

Output