BEKA BA527C, Manual

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14
Symptom Cause Solution
No display, No power Check that a current
and 0V supply is flowing in the loop.
between
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.
7.3 Servicing
BA527C and BA528C indicators are difficult to
service to component level on-site. All standard
BA527C and BA528C indicators are
interchangeable, and a single spare assembly can
be used to replace any instrument that fails.
We recommend that, except under exceptional
circumstances, suspect instruments are returned to
BEKA associates or our local agent for repair.
7.4 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.
7.5 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.
7.6 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.
8. Accessories
8.1 Scale card
The BA527C and the BA528C have a window on
the right hand side of the display to hold a card
showing the units of measurement e.g. °C, mBar,
RPM. Indicators can be supplied with a printed
scale card showing any units specified at the time
of ordering. If a printed scale card is not requested,
a blank card will be supplied.
Scale cards can easily be marked on site as
follows:
a. Remove the rear terminal block and the rear
panel as shown in Fig 7.
b. Carefully pull the indicator assembly from
the enclosure.
c. Gently pull and then slide the blank scale
card towards the display window until it is
free. Mark the card with the required legend
and replace in the slot.
8.2 Tag strip
The BA527C and the BA528C can be supplied
with a thermally printed tag number on the rear
panel. This tag number is not visible from the front
of the instrument after installation.
8.3 Alarms
The BA527C and BA528C can be supplied with
two solid state single pole alarm outputs that may
be independently programmed as high or low
alarms with normally open or normally closed
outputs in the non-alarm condition. Fig 8 illustrates
the conditions available and shows which are fail
safe, i.e. in the alarm condition the output is open.
When an alarm is activated the indicator display
alternates between the measured value and a
alarm identification.
Fig 8 Alarm outputs