BEKA BA374C, Manual

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9. MAINTENANCE
The instrument should only be maintained by
trained competent personnel.
9.1 Fault finding during commissioning
If the BA374C transmitter fails to function during
commissioning the following procedure should be
followed:
Symptom Cause Solution
No display Incorrect Check wiring
or output wiring or no and power
current power supply supply polarity
Check that voltage
between terminals
5 & 6 is between 10
and 30V with terminal
5 positive.
BA374C Positive The transmitter input
displays 1 display exceeds the upper
over-range operating range of the
selected THC or RTD.
For voltage inputs,
display is incorrectly
calibrated.
Check calibration.
BA374C Negative The transmitter input
displays -1 display is less than the lower
over-range operating range of the
selected THC or RTD.
For voltage inputs,
display is incorrectly
calibrated.
Check calibration.
Output fixed 4/20mA output The transmitter output
below 4mA current over, current is incorrectly
or above or under-range calibrated.
20mA. Check calibration.
9.2 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 BA374C fails after it has been functioning
correctly the procedure shown in section 9.1
should be followed.
9.3 Servicing
The BA374C cannot be serviced on-site. Electronic
assemblies may be exchanged between enclo-
sures, but sub-boards must not be interchanged
between electronic assemblies. All BA374C trans-
mitter functions are easily programmable on-site, a
single spare transmitter or electronic assembly
may therefore be used to replace any instrument
which fails.
Suspect instruments should be returned to BEKA
associates or to our agent in your area.
9.4 Routine maintenance
The mechanical condition of the instrument and
electrical calibration (see section 7.2) should be
regularly checked. The interval between inspec-
tions depends upon environmental conditions. We
recommend that initially this is performed annually.
9.5 Guarantee
Transmitters 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 and a list of error messages is provided.
9.6 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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