3600 Analyzer for O
2
Measurement—Operator’s Manual 55
3600O2.OM.E9903
2.2 Sensor Installation
The oxygen sensor may be mounted in a pipe via a sensor socket or ProAcc, or
into a sample by means of a flow chamber, described in the sections below.
The sensor and indicating instrument interface via a 10-pin LEMO connector. The
standard sensor cable length is three meters, but extension cables of up to 500
meters can be provided without any loss in signal sensitivity. If the model 28117
pressure sensor is used, note that its maximum cable length is 50 meters.
2.2.1 Model 29501 Sensor Socket Installation
The model 29501 sensor socket enables the sensor to be installed into any stainless
steel pipe with a diameter greater than 50 mm. The sensor, with protection cap,
extends 28 mm into the sensor socket. When cutting the sensor socket to fit the
radius of your pipe, you should allow for a 4-mm setback between the inner
diameter of your pipe and the top of the sensor.
Sensor socket mounting—side view
Be sure to remove the two O-rings from the sensor socket before pipe welding. In
addition, you should make sure you re-attach the sensor socket collar (included)
before welding begins. This prevents distortion of metal threads during welding.
You must make certain the sensor is mounted:
• perpendicular to the pipe;
• horizontally;
• on a horizontal stretch of pipe (or on flow-ascending vertical pipe); and
• on the pump’s discharge side and, if possible, at least 15 meters downstream.
Sensors should not be installed on the suction side of a pump, or close to valves or
bends in the pipe. In addition, the installation of sensors near air or carbon dioxide
injection is to be avoided, or it will require the installation of a frit that will
guarantee the complete dissolution of those gases. (There may be locations where
not every one of these conditions above can be met. If so, it is best to consult with
your Orbisphere representative to determine whether any compromises in
installation will result in serious oxygen measurement errors or other difficulties.)
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