72-900-06 Rev. F
Page 33 of 38
7. MAINTENANCE
The only recommended maintenance required on the controller is periodic inspection of
the conductivity sensor every 6 months. It is recommended to establish a regular
maintenance schedule designed to meet the needs of each particular application. All
other service should be performed by factory authorized personnel only. Modifications
to or tampering with the circuit level components makes all warranties, written or
implied, and/or manufacturer’s responsibility for this controller, null and void.
DISCONNECT POWER BEFORE OPENING THE UNIT TO ACCESS FUSES. MAKE SURE
THAT REPLACEMENT FUSES ARE OF SAME TYPE TO MAINTAIN SAFETY APPROVALS.
ALWAYS DEPRESSURIZE UNIT BEFORE REMOVING PROBES
5 X 20mm, 8A, 250V (Output power)
5 x 20mm, 1A 250 V (Input power)
7.1 Conductivity Sensor removal and cleaning
To remove the conductivity sensor from its tee for cleaning:
1. Remove power to the system.
2. Remove pressure from the system prior to unscrewing the sensor by closing the hand
valves located before and after flow assembly.
3. Open the sample port; this will facilitate removal of sensor.
4. Unscrew the coupling nut.
5. Remove the sensor.
To clean conductivity sensor:
1. Wipe the sensor with a clean cloth.
7.2 pH sensor Information
The combination pH sensor supplied with your controller is designed for maximum
reliability, accuracy, and ease of use. The reference half-cell is sealed and non-refillable.
The sensor is shipped with a protective boot or bottle filled with a junction wetting agent.
7.2.1 Preparation
Remove the lower portion of the protective boot and rinse the sensor tip with tap water. It
is possible that air bubbles may have migrated into the pH sensitive bulb during shipment.
The sensor is unable to function with air in the bulb. To remove air, gently shake the sensor
downward in the same manner as a clinical thermometer. Prior to first usage or after long-
term storage, immerse the lower end of the sensor in tap water for thirty minutes. This
hydrates the pH bulb and prepares the liquid junction for contact with the test solution.
Occasionally during long-term storage or shipment, the sensor may develop a film on the
pH bulb. The film may be removed by following sensor cleaning instructions.
To Next Page
Loading...
