Thermo Fisher Scientific ECFP21A1A1 Differential pH Sensor - Manual (Page 12)

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Detailed Insertion Mount Installation Instructions
1. Wiring:
c. Route the sensor cable through the 1.5 inch extension pipe.
d. Apply Teflon® tape to the sensor threads.
e. Attach the sensor to the 1.5 inch NPT coupling by turning the sensor in a clockwise
direction until secure.
f. Either route the cable directly to the Alpha pH2000D or splice the wires in a
junction box and use an extension cable.
g. Insert the cable into the Alpha pH2000D controller through a watertight cord grip.
Conduit holes are provided for the cord grip on the bottom of the Alpha pH2000D
controller.
h. Connect the sensor wires into the Alpha pH2000D sensor terminal block as shown
in the Alpha pH2000D manual.
2. Calibrate:
a. Power the Alpha pH2000D controller.
b. 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.
c. Calibrate the pH sensor as explained in the Alpha pH2000D 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.
d. 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. Secure the pipe assembly so that the sensor is fully immersed in the process.
Be sure that the wire colors of the sensor cable match those of the interconnect cable on
either side of the terminal strip.
Do not route the interconnect cable conduit where there are AC or DC power cables
which create electrical noise that may interfere with the sensor signal.
Route the interconnect cable through metal conduit to minimize electrical noise that
may interfere with the sensor signal.