Diagnostics and repair
LFXG-H Installation and Operation Guide
73
C
H A P T E R
5
Chapter 5
D
IAGNOSTICS
AND
REPAIR
Software diagnostics
The level transmitter system can alert users to potential problems by:
• Posting messages on the Ohmview 2000 message screen
• Energizing the output relay
• Distinctly changing the current loop output
• Tracking the current status and history in the Gauge status screens
Table 5.1
Alarm types
Name
Description
Diagnostic
alarm
Provides information about the level gauge system and alerts
users when periodic procedures are due.
Analog alarm
Sets the current loop mA output to 2 mA or 22 mA when the
detector outputs 0 counts.
Process
alarm
The process alarm lets the relay output trip when the process
level is above (high limit) or below (low limit) a setpoint.
X-ray alarm
Distinctly changes the current loop mA output in response to a
marked increase in the radiation field. This prevents control
problems when external radiographic sources are in the area for
vessel inspections.
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