Troubleshooting The Pressure Transducer Block; Table 20: Pressure Transducer Block - Honeywell ST700 User Manual

Troubleshooting the Pressure Transducer block

Problem cause
Transducer block
mode is in OOS and
does not change to
AUTO mode.
Transducer block does
not produce valid
primary Value.
Transducer block does
not produce valid
Secondary value.
Transducer block does
not produce valid
Tertiary value.
Transducer block does
not produce valid Fluid
Level value.
Transducer block
shows incorrect
Electronic Housing
temperature value.
Zero calibration failed.
LRV calibration failed.
URV calibration failed.
Block alarms are not
reported.
Page 98 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide

Table 20: Pressure Transducer block

Things to check
Read
MODE_BLOCK.PERMITTED
Read MODE_BLOCK.
ACTUAL of Resource block.
Check the Primary value
Range.
Read BLOCK_ERR.
Verify parameter:
PRIMARY_VALUE is not valid
STATUS = Good or Uncertain
VALUE = active
Read SENSOR_TEMP. Must
contain the sensor
temperature.
Check the Secondary value
Range.
Check the Tertiary value
Range.
Check the Level co-efficient
and Tank range.
Check the Electronic Housing
temperature units.
Check the Air Pressure
applied.
Check the Air Pressure
applied.
Check the Air Pressure input.
Read FEATURE_SEL.
Read LIM_NOTIFY.
Recommended action
Add AUTO mode to
MODE_BLOCK.PERMITTED.
If necessary, Set MODE_BLOCK.TARGET
to AUTO.
NOTE: If the mode is set to OOS for
maintenance, then do not change the mode
to AUTO.
Ensure that primary Value Range has valid
ranges and units assigned.
See Table 3 for details on BLOCK_ERR.
Isolate transmitter from process.
Perform Correct Reset calibration.
Recalibrate the transmitter.
Report information to Honeywell.
Ensure that Secondary Value Range has
valid ranges and units assigned.
Ensure that Tertiary Value Range has valid
ranges and units assigned.
Ensure that the Level co-efficient is
calculated properly. See Error! Reference
source not found..
Ensure that proper unit is assigned to
Electronic Housing temperature.
Ensure that the differential pressure input is
zero while using a tube to connect the High
Pressure (HP) and Low Pressure (LP) heads.
Ensure that Air pressure is applied as per the
CAL_POINT_LO value entered.
Ensure that Air pressure is applied as per the
CAL_POINT_HI value entered.
Reports are not selected in FEATURE_SEL.
If features do not include Reports then the
host must poll for alarms.
Set LIM_NOTIFY to a value higher than zero,
but not higher than MAX_NOTIFY.
Revision 2.0