HPP-4 Positioner
Maintenance and Inspection
HPP-4
15
September 1999
HPP-4
15
September 1999
Model HPP-4 Single-Acting Positioner Annual Maintenance Checklist
1. __________
Soap test all diaphragm mating surfaces to check for leaks.
2. __________
Replace rubber goods utilizing Becker Model HPP-4 Single-Acting Posi-
tioner Repair Kit (Part # 30-9501) if necessary.
Refer to Pages 12-17, HPP-SB Assembly Procedures.
3. __________
Confirm Power Gas Supply Pressure is correct.
Refer to original Becker invoice paperwork for proper power gas setting.
4. __________
Observe operation of gages and replace if defective.
5. __________
Check integrity of HPP-4 positioner seats. Varying input signal 1 psig
should send one cylinder output gauge to full power gas.
Refer to Procedure 7 note, pages 9, Adjustment Procedure.
6. __________
Check response of HPP-4 positioner. Varying input signal 1/4 psig
should produce cylinder output gauge differential equal to 40% of
power gas.
Refer to Procedure 6-8, pages 8-9, Adjustment Procedure.
7. __________
Check range and bias of HPP-4 positioner and adjust if necessary.
Refer to Pages 9-11 of adjustment procedure.
8. __________
Inspect and Verify Proper Operation of all HPP-4 Positioner Accesso
ries.
Refer to technical manual included with each specific instrumentation ac-
ces-
sory for further instruction.
Note: It is not necessary to replace any rubber goods in Becker
instrumentation or instrumentation accessories on a regular basis. However, common
practice suggests that replacement of rubber goods on a 5-year cycle basis provides
adequate preventative maintenance.
