ONICON System-10 BTU - Manual (Page 32)

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System-10 BTU Meter Manual 03/15 - 0651-16 / 18323 Page 32
5.1.3 Temperature Test Signals
Temperature Test
As you are facing the component side of the Btu computer board, the temperature test
pushbutton is along the top edge of the board just to the left of the flat ribbon cable. It is
labeled TEMP TEST. When pressed, a fixed voltage will be applied to each temperature
sensor input. Both the supply and return temperature menu pages will display a
temperature between 98° F to 102° F (36.6° C to 38.9° C). This test confirms the operation
of the Btu computer board input circuitry for temperature measurement.
5.2 ALARM STATUS MENU PAGE
Alarm Status Menu Page
STATUS NORMAL indicates normal operation. The display will indicate STATUS ALARM when
any one of the 5 alarms listed below is present.
Volume (Flow) Scale Overrun – This alarm is present whenever the volume flow rate causes the
incremental volume total to accumulate at a rate that is too fast.
To clear this alarm message, first confirm that the flow rate data and pipe diameter data on the tag
attached to the meter corresponds with the actual flow rate and actual pipe diameter. Any
mismatch between the calibrated and actual flow rates or the calibrated and actual pipe diameter
will cause this alarm message to appear. Contact ONICON for assistance in correcting this
condition.
Heat (Energy) Scale Overrun – This alarm is present whenever the energy flow rate causes the
incremental energy total to accumulate at a rate that is too fast.
To clear this alarm, first confirm that the actual temperature sensor readings and the actual flow
reading are within expected norms and match the calibration data provided for the System-10
BTU Meter. Either an excessively high delta temperature or an unexpectedly high flow rate can
cause this alarm message to appear. Contact ONICON for assistance in correcting this condition.
Pulse Overrun – This alarm is present whenever the incremental energy total is accumulating at a
rate that exceeds the time interval required for the 50% duty cycle of the pulse.
This alarm will normally coincide with either the volume scale or heat scale alarms. That
message must be cleared before this message can be cleared. Contact ONICON for assistance in
correcting this condition.
Volume (Flow) Scale Overrun: OK=0; Alarm=1
Heat (Energy) Scale Overrun OK=0; Alarm=1
Pulse Overrun: OK=0; Alarm=1
Top Turbine: OK=0; Alarm=1
Bottom Turbine: OK=0; Alarm=2
System Reset Count: Number of system resets=0-255