Chapter 7 - Maintenance and Calibration Procedures
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Chemical Equipment
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Figure 7-2: Bubbler Scale Zero and Span Adjust
7.2.3 Sump Dual Spill Sensors Verification
The Dual Spill Sensor(s) consist of hermetically sealed reed switches actuated by magnetic
floats. As the floats rise and fall with the liquid level, the magnetic field passing the switch
causes the switch to either open or close.
The CG050 uses Dual Float Sensors which are closed in the normally dry condition and open
when wet to generate Fault and/or Shutdown alarms depending on the operation mode.
During the Dual Float Sensors verification, the CG050 should be in an idle condition as a
Bubbler shutdown will occur and stop delivering the vapor mixture to the process tool.
NOTE
: The Dual Float Sensors do not require calibration. It is recommended to verify the
floats move freely by lifting each one up and it should freely fall down. Verify there is
no build-up of debris on the float and stem which could cause hang-up. The
assembly can be cleaned using isopropyl alcohol.
1. The Dual Float Sensors are mounted in the lower portion of the cabinet, mounted to front
right side below the bulk container shelf. Reach in and gently lift up one float at a time.
The test result should be a SPILL DETECTED or SPILL DETECTED 2 fault alarm.
2. Clear alarm and test other float.
3. Verify each float sensor movement several times to ensure the floats are free falling.
4. Gently lift up both floats at once. The test result should be a DUAL SPILL DETECT
shutdown alarm.
5. Verify that the DUAL SPILL DETECT alarm can be cleared
