Thermo Scientific AquaSensors
™
AnalogPlus
™
Dissolved Oxygen Sensor (ppm) User Guide
16
Detailed Insertion Mount Installation Instructions
1.
Wiring:
a.
Route the sensor cable through the 1.5 inch extension pipe.
b.
Apply Teflon® tape to the sensor threads.
c.
Attach the sensor to the 1.0 inch NPT reducing coupling by turning the sensor in a
clockwise direction until secure.
d.
Either route the cable directly to the AV88 analyzer or splice the wires in a junction
box and use an extension cable.
e.
Insert the cable into the AV88 analyzer through a watertight cord grip. Conduit
holes are provided for the cord grip on the bottom of the AV88 Analyzer.
f.
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: Secure the pipe assembly so that the sensor is fully immersed in the process
a.
Side Wall Immersion Mounting: Use 2 inch U-bolts to secure the extension pipe to
the side wall.
b.
Immersion Mount with had rail swivel positioning: Refer to illustration notes on
pages 12 and 13 for hand rail mounting and positioning.
c.
Immersion Mount with ball float: Refer to illustration notes on pages 14 and 15 for
hand rail and ball float mounting and positioning.
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.
