Thermo Scientific AquaSensors
™
AnalogPlus
™
Differential pH Sensor User Guide
18
Detailed Union Mount Installation Instructions
1.
Wiring:
a.
Apply Teflon® tape to the front sensor body threads and pass the cable through
the adapter. Thread the adapter onto the sensor clockwise until it is secure.
b.
Pass the retaining collar over the cable and onto the adapter with the threads
facing the sensor.
c.
Route the cable either through conduit or on a cable tray.
d.
Insert the sensor cable into the controller through a watertight cord grip or a conduit.
e.
Connect the sensor wires into the controller terminal block as shown in the
controller manual.
2.
Calibrate:
a.
Apply power to the controller and allow the sensor to warm up for approximately ½
hour before calibrating the measurement.
a.
Remove the protective cap from the sensor head and make sure moisture is
present and that the salt bridge has not dried out. If the protective cap is dry, the
sensor should be hydrated in tap water for at least 1 hour prior to calibration.
b.
Calibrate the pH sensor as explained in the controller manual. It is recommended
to use a 2-point buffer calibration on installation of the sensor. Subsequent
calibrations should be scheduled based on process demands.
c.
If measurement response time is slow or if the sensor will not calibrate, refer to
Section 4 for maintenance, refurbishment and troubleshooting suggestions.
3.
Mount:
a.
Inspect the O-ring on the union-mounting threaded flange for imperfections or
particles of dirt that may prevent the O-ring seal from seating properly.
b.
Carefully insert the sensor into the Thermo Scientific AquaSensors union mounting
tee. Turning the retaining collar clockwise and hand tighten until snug. Be sure the
pipe remains full when the sensor is installed.
