Chapter 4 Maintenance

Series 830/840/860 Instruction Manual

 

 

Caution!

Do not remove the sen- sor cover, this could shift transducer calibration.

Sensor Maintenance

The sensor tube is straight and has a relatively large, 0.031 inch ID, which makes inspection and cleaning easy. Sensor mainte- nance consists of:

inspecting and cleaning the sensor flow path

checking the sensor for proper electrical function

Caution!

When using toxic or cor- rosive gases, purge the unit thoroughly with inert dry gas before discon- necting from the gas line.

Sensor Cleaning and Inspection

Cleaning is accomplished by simply rodding out the sensor with the Sensor Cleaning Stylette, part number “CK”, available from Sierra for this purpose. (A 0.020 inch to 0.028 inch diameter piano wire may also be used.) To access the sensor for inspection or cleaning:

1.Remove the unit from the system.

2.Remove the two socket head ac- cess port plugs with a 1/4 inch Allen wrench.

3.Visually inspect the sensing ports and sensor.

4.Use a hemostat or tweezers to push the cleaning wire into the downstream opening of the sensor tube. Do not force the clean- ing wire; move it back and forth–DO NOT TWIST OR ROTATE.

5.Flush the sensor tube with a non-residuous solvent. In cases where solids are deposited in sensor, units should be returned to factory for complete cleaning and re-calibration.

6.Blow dry all parts with dry nitrogen and re-assemble.

7.When the transducer is re-installed in the system, leak test the connection.

8.Check transducer calibration.

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Sierra 840, 860, 830 instruction manual Sensor Maintenance, Sensor Cleaning and Inspection

840, 830, 860 specifications

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