Hach-Lange POLYMETRON 9500 pH_ORP Sensors User Manual - Manual (Page 8)

1. Unscrew the measurement chamber (No. 6).
2. Remove the protector covering the pH bulb and rinse with deionized water or pH buffer and store
in a safe place for future use.
3. Gently shake the sensor downward in the same manner as a clinical thermometer to remove any
trapped air bubbles.
4. Record the installation date on the label (No. 10).
5. Screw the measurement chamber back in place.
6. Assemble the 1/8" NPT input/output connections and connect the sample inlet to position No. 8
and the outlet to position No. 9.
7. Circulate the sample and check visually through the chamber for the absence of bubbles which
could affect the measurement.
8. Adjust the flow rate to approximately 150 mL/minute.
9. To avoid back pressure it is advisable to discharge the sample at atmospheric pressure into a
drain.
10. The device should be grounded (No. 4) to avoid any external electrical noise interference.
11. To avoid damage to the sensor, make sure the flow chamber is never empty. Make sure the glass
bulb is always immersed in water or buffer solution.
8417 sensor
The sensor can be installed in any position. Mount the sensor using a standard PG13.5 threaded
cap.
To avoid damage to the sensor, make sure the glass bulb is always immersed in water or buffer
solution.
Maintenance
D A N G E R
Multiple hazards. Only qualified personnel should conduct the tasks described in this section of the manual.
Controller
Refer to the Maintenance section of the controller documentation.
Maintenance schedule
The maintenance schedule shows minimum times for regular maintenance tasks. Perform
maintenance tasks more frequently for applications that cause electrode fouling.
Maintenance task 90 days Annually
Clean the sensor X
Inspect sensor for damage X
Calibrate sensor Set by regulatory agencies or experience
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