18
8.
MAINTENANCE
8.1
Fault finding during commissioning
If an indicator fails to function during
commissioning the following procedure should be
followed:
Symptom
Cause
Solution
No display
Incorrect
wiring
Check wiring
There should be
0.6 to 1.2V
between terminals
1 & 3 with terminal
1 positive.
With an optional
backlight loop
powered, there
should be 3.4 to 5V
between terminals
3 & 12 with terminal
12 positive.
No display
0V between
terminals 1 & 3.
Incorrect
wiring or no
power supply
Check supply
voltage and voltage
drop caused by all
the instruments in
the loop.
All decimal points
flashing.
Overrange or
underrange if
-ve sign is
displayed.
Recalibrate the
numerical display.
Unstable display 4/20mA input
is noisy.
Eliminate ripple on
4/20mA power
supply and/or
decrease indicator
resolution.
Unable to enter
configuration
menu.
Incorrect
security code
entered.
Enter correct
security code, or
contact BEKA if the
code has been lost.
8.2
Fault finding after commissioning
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
Live maintenance within a Zone 2
hazardous area should only be performed
when it is permitted by risk analysis or
when there is no risk of a flammable
atmospjher being present.
If an indicator fails after it has been functioning
correctly, follow the procedure shown in section
8.1. If this does not reveal the cause of the fault, it
is recommended that the instrument is replaced.
8.3
Servicing
All BA304NG and BA324NG loop powered
indicators are interchangeable if the required
optional backlight and alarms are fitted. A single
spare instrument may quickly be recalibrated to
replace any instrument that is damaged or fails.
No attempt should be made to repair instruments
at component level.
We recommend that faulty instruments 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.
