User Manual

11
7. MAINTENANCE
7.1 Fault finding during commissioning
If a BR323AL or BR323SS fails to function during
commissioning the following procedure should be
followed:
Symptom Cause Solution
No display Incorrect There should be 2.3V
wiring between the +ve &
-ve terminals.
No display Incorrect Check that a current
and no volts wiring or is flowing in the
between no power loop.
+ve & -ve supply.
terminals.
Insufficient Check supply
loop voltage voltage and voltage
to operate drops caused by all
indicator components in the
loop
Indicator Positive The input current
displays Hi over-range is greater than
21.4mA.
Indicator Negative The input current
displays Lo under-range is less than 3.8mA.
Unstable 4/20mA Ensure loop supply
display input has a voltage is sufficient.
large ripple to operate the
content. Indicator.
Ensure that Filter
is set to frequency
of local mains
supply.
Increase indicator
damping time.
7.2 Fault finding after commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
Live maintenance is NOT permitted on
flameproof equipment. BR323AL and
BR323SS indicator maintenance should
only be performed in a potentially
hazardous area when an explosive
atmosphere is not present.
If a BR323AL or BR323SS fails after it has been
functioning correctly, the following procedure
should be followed:
Symptom Cause Solution
No display No power Check that a
and no volts supply current is flowing in
between +ve the loop.
& -ve terminals.
Unstable 4/20mA input Check loop supply
display has a large voltage.
ripple.
Ensure that Filter
is set to frequency
of local mains
supply.
Increase indicator
damping.
If this procedure does not reveal the cause of the
fault, it is recommended that the BR323 electronic
assembly is replaced.
Note: while the BR323 electronic assembly is
disconnected the 4/20mA loop will be open circuit.
7.3 Servicing
All standard BR323 electronic assemblies are
interchangeable, and a single spare may be used
to replace any instrument that fails.
We recommend that faulty BR323 electronic
assemblies are returned to BEKA associates or to
our local agent for repair.
7.4 Routine maintenance
The mechanical condition of the instrument and the
electrical calibration should be regularly checked.
The interval between inspections depends upon
environmental conditions. We recommend that
initially instrument calibration should be checked
annually.