Sierra Series 830/840/860 Side-Trak™ and ... - Sierra Instruments

Chapter 4 MaintenanceSeries 830/840/860 Instruction ManualCaution!Do not remove the sensorcover, this could shifttransducer calibration.Caution!When using toxic or corrosivegases, purge theunit thoroughly with inertdry gas before disconnectingfrom the gas line.Sensor MaintenanceThe sensor tube is straight and has a relatively large, 0.031 inchID, which makes inspection and cleaning easy. Sensor maintenanceconsists of:• inspecting and cleaning the sensor flow path• checking the sensor for proper electrical functionSensor Cleaning and InspectionCleaning is accomplished by simply rodding out the sensor withthe Sensor Cleaning Stylette, part number “CK”, available fromSierra for this purpose. (A 0.020 inch to 0.028 inch diameter pianowire may also be used.) To access the sensor for inspection orcleaning:1. Remove the unit from the system.2. Remove the two socket head accessport plugs with a 1/4 inchAllen wrench.3. Visually inspect the sensing portsand sensor.4. Use a hemostat or tweezers to push the cleaning wire into thedownstream opening of the sensor tube. Do not force the cleaningwire; move it back and forth–DO NOT TWIST ORROTATE.5. Flush the sensor tube with a non-residuous solvent. In caseswhere solids are deposited in sensor, units should be returnedto 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 theconnection.8. Check transducer calibration.4-6 IM-83/84/86-H