Thermo Scientific AquaSensors
™
AnalogPlus
™
Dissolved Oxygen Sensor (ppm) User Guide
20
Detailed Union Mount Installation Instructions
1.
Wiring:
a.
Apply Teflon® tape to the rear sensor body threads and pass the cable through
the adapter. Thread the adapter onto the sensor clockwise until it is secure.
b.
Pass the union 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 AV88 through a watertight cord grip. Conduit
holes are provided for the cord grip on the bottom of the AV88 Analyzer.
e.
Connect the sensor wires into the AV88 sensor terminal block as shown in the
AV88 manual.
2.
Calibrate:
a.
Power the AV88 Analyzer and let the sensor run for at least 1 hour before
calibration.
b.
Remove the protective cap from the sensor head and make sure moisture is
present and the membrane 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 Dissolved Oxygen sensor as explained in the AV88 manual.
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.
Assemble the lower portion of the mounting hardware by threading the pipe nipple
into the threaded flange and the tee. Apply Teflon® tape to the threads.
b.
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.
c.
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.
