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7835
Hydrazine Monitor
8 Troubleshooting
8.1 Diagnostics Classification Codes
Diagnostic messages and icons conforming to the NAMUR NE107 classification code are used to define information during operation
– a typical diagnostic message is shown in Fig. 8.1.
Hydrazine µg/kg
80.0
20.0
Deg. C
In Recovery
Fig. 8.1 Diagnostic Status Bar
8.2 Diagnostics Messages
Icon
Message
Comms Failed
Pt1000 Failed
ADC Failed
Invalid Setting
In Recovery
Last Cal. Failed
Temperature Hot
Temperature
Cold
Cal. Near Fail
Table 8.1 Diagnostic Messages
20
CM30
Operator
Page
Failure
Maintenance
Out of Specification
Check Function
Possible Cause
Power supply unit has failed or cable between
transmitter and sensor unit is damaged.
Pt1000 has failed or the cable from sensor
terminal box to temperature sensor is broken.
Temporary or permanent failure of analog to
digital converter on the sensor terminal board.
Switch in sensor terminal box is set incorrectly.
After a calibration has been completed the
alarms and analog outputs are held for the
duration of the recovery period to allow the
sample to stabilize to the normal measurement.
Calibration has failed.
The temperature of the sample water has
exceeded 55 °C (131 °F).
The temperature of the sample water has fallen
below 5 °C (41 °F).
Sensor approaching the end of its life and is likely
to fail soon.
In Recovery
NAMUR (NE107)
Status Icons
High Process Alarm
Low Process Alarm
Suggested Action
Check wiring between transmitter and sensor
unit.
Check voltage across red and black wires is
approximately 24 V. If problem not resolved
contact local service organization.
Check wiring inside sensor unit. If problem not
resolved contact local service organization.
Cycle power to device. If problem persists
replace sensor terminal board/contact local
service organization.
Ensure switch adjacent to the terminals in the
sensor terminal box is in the up position.
Message disappears automatically once the
recovery period has expired. Alarms and
analog outputs become active.
Sensor needs replacing.
Hydrazine concentration is held automatically
at the last known value. Normal measurements
are resumed when the temperature falls below
55 °C (131 °F).
Hydrazine concentration is still displayed but a
fixed temperature compensation appropriate to
5 °C (41 °F) is applied.
Sensor (or system) requires attention soon.
8 Troubleshooting
Description of diagnostic
or alarm tag.
The highest priority diagnostic
or alarm is displayed.
IM/7835–EN Rev. P
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