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If the unit enters an alarm condition, the motor, pump, and heater will all the
stopped automatically.
The three controllers on the unit can cause an alarm: pressure, temperature
and 15 VDC. Check the display on each of the three controllers. The one that
caused the alarm will display “1FSH” or “Sbr”.
Always address an alarm condition immediately. Failure to do so could
result is damage to the equipment or even operator injury.
If an alarm condition appears to be in error, follow these steps to diagnose
the problem:
1. Compare the reading on the three controllers to the three readings on
the chart recorder. If any of the three controllers shows a significantly
different reading than the chart recorder, there may be a problem with
the devices or the wiring. Make sure all devices are working and are
properly connected to each other.
2. Check the following, based on which controller is causing the alarm:
- Temperature: Make sure the thermocouple is plugged securely
into the jack on the unit cabinet.
- Pressure: Open the panel on the side and locate the shunt. The
shunt has three positions: out, middle, and in. If it is either out or
in (not middle), the controller will report the maximum pressure,
causing an alarm. Make sure the shunt is in the middle position.
Also, check the cable connection to the transducer inside the
cabinet. Make sure it is screwed firmly into the transducer.
- 15 VDC: Make sure the potentiometer is installed correctly inside
the test cell. The orientation of the electrical contacts must match
the nodes on the inside of the cell.
3. Check the alarm setting on the controller. If the alarm is set too low
(for example: if the temperature alarm is set to 32°F), the unit will
always be in an alarm condition. Refer to the documentation for each
controller for further instructions.