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8. MAINTENANCE
8.1 Fault finding during commissioning
If a BA327C or BA328C fails to function during
commissioning the following procedure should be
followed:
Symptom Cause Solution
No display Incorrect There should be 1V
wiring. between terminals 1
& 3 with terminal 1
positive.
No display, Incorrect Check that a current
0V between wiring or is flowing in the loop.
terminals 1 no power
and 3. supply.
Insufficient Check supply voltage
loop voltage and voltage drops
to operate caused by all
indicator. components in the
loop.
Indicator Positive The indicator has
displays 1 over-range. been incorrectly
calibrated & is
trying to display a
number greater than
19999.
Indicator Negative The indicator has
displays –1 over-range. been incorrectly
calibrated & is
trying to display a
number less than
-19999.
Unstable 4/20mA input Check loop supply
display has a large voltage.
ripple content.
Unable to Incorrect Enter correct security
enter the security code or fit security
programme code link in override
mode. entered. position. See Fig 7.
8.2 Fault finding after commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
Live maintenance is permitted on
intrinsically safe equipment installed in a
hazardous area, but only certified test
equipment should be used unless a gas
clearance certificate is available.
If a BA327C or BA328C fails after it has been
functioning correctly, the following procedure
should be followed:
Symptom Cause Solution
No display, No power Check that current
0V between supply is flowing in the loop.
terminals 1
and 3.
Unstable 4/20mA input Check loop supply
display has a large voltage.
ripple.
Incorrect Digital filter Recalibrate
calibration FrE has been
changed after
indicator was
calibrated.
If this procedure does not reveal the cause of the
fault, it is recommended that the instrument is
replaced. This can be done without disconnecting
power, but while the indicator is disconnected the
4/20mA loop will be open circuit.
8.3 Servicing
All standard BA327C and BA328C indicators are
interchangeable, a single spare assembly may
therefore be used to replace any instrument which
fails.
We recommend that faulty instruments
and instrument assemblies are returned
to BEKA associates or to your local
BEKA agent for repair.
8.4 Routine maintenance
The mechanical condition of the instrument and
electrical calibration should be regularly checked.
The interval between inspections depends upon
environmental conditions. We recommend that
initially instrument calibration should be checked
annually.
8.5 Guarantee
Indicators which fail within the guarantee period
should be returned to BEKA associates or our local
agent. It is helpful if a brief description of the fault
symptoms is provided.
8.6 Customer comments
BEKA associates is always pleased to receive
comments from customers about our products and
services. All communications are acknowledged
and whenever possible, suggestions are
implemented.
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