BEKA BA374NC, Manual

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9. MAINTENANCE
9.1 Fault finding during commissioning
If the BA374NC 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.
BA374NC 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.
BA374NC 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 should only be
performed when there is no risk of a
flammable atmosphere being present,
and dust or water can not enter the
enclosure. Before replacing the
instrument front cover ensure that the
sealing gasket is undamaged and is
free from dirt and foreign bodies.
If a BA374NC fails after it has been functioning
correctly, the procedure shown in section 9.1
should be followed.
9.3 Servicing
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
Live maintenance should only be
performed when there is no risk of a
flammable atmosphere being present,
and dust or water can not enter the
enclosure. Before replacing the
instrument front cover ensure that the
sealing gasket is undamaged and is
free from dirt and foreign bodies.
We recommend that faulty instruments are
returned to BEKA associates or our agent in your
area for repair.
9.4 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 routine maintenance 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.
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