Vega DSGH, Quick Reference Manual

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Maintenance and Diagnostics
Maintenance and Diagnostics
The transmitter system alerts you to detector problems by:
•
Posting messages on the Ohmview 2000 message screen.
•
De-energizing the output relay.
•
Distinctly changing the current loop output.
•
Tracking the current status and history in the Gauge status screens.
Alarm Types
Name Description
Diagnostic Diagnostic alarm provides information about level gauge system and alerts users
when periodic procedures are due.
Analog Analog alarm sets the current loop mA to 2 mA or 22 mA when detector outputs zero
(0) counts.
If analog alarm is on, check the following:
•
Is source holder shutter in On or Open position to create the required radiation
field?
•
Is there extreme build-up on walls or other material that is shielding detector
from radiation field?
• Are electrical connections from sensor assembly to CPU board damaged or
disconnected?
Process Process alarm triggers when process level is above or below a set point (high limit or
low limit).
Enter choice of low or high limit and set point on
Alarm | Relay Setup tab. This
alarm only works for output relay.
The gauge acknowledges or resets process alarm when process value returns to set
point value.
X-ray X-ray alarm changes current loop mA output in response to marked increase in
radiation field. This change prevents control problems when external radiographic
sources are in the area during vessel inspections. Gauge sets current loop output at
value measured 10 seconds before condition. Gauge cycles until radiation field is
back to normal level or until a time-out period of 60 minutes passes.
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