56 3600 Analyzer for O
2
Measurement—Operator’s Manual
3600O2.OM.E9903
After you have determined the most likely location for the sensor socket, the
following recommendations, although not required, can enhance the versatility of
the installation. In most cases, the sensor socket will be located in a position where
a significant amount of liquid must be drained from the line before the oxygen
sensor can be inserted or withdrawn. By creating a meter-long spool piece, as
shown below, with butterfly isolation valves at either end, just a small volume of
liquid need be drained to gain access to the sensor.
It also allows for the critical installation of the sensor socket—where tolerances
within a millimeter are required—to be done in a workshop environment, and
allows the less critical welding of the pipe flanges to be done in the plant.
Spool piece recommendation
2.2.2 Model 32003 ProAcc Insertion/Extraction Valve Installation
The model 32003 ProAcc permits an O
2
sensor to be inserted or removed from a
pipe while the sample is still flowing. It clamps to the Tuchenhagen Varivent in-
line access unit. (This device is available from the manufacturer to fit from one- to
six-inch outer diameter pipe.) The ProAcc is held in place by a stainless steel
clamp.
Sensor installed in a ProAcc—cross sectional view
Since the sensor is mounted directly in-line, location requirements are as stated
above for the sensor socket (section 2.2.1).
To insert the sensor, screw on the sensor collar until coming to a stop. This places
the sensor in-line. Removal is accomplished by unscrewing the collar. This valve
can withstand line pressures of up to 20 bars, with or without the sensor in place.
2.2.3 Model 32001.x Flow Chamber Installation
The model 32001.x flow chamber is used to draw liquid and gaseous samples past
the oxygen sensor. It connects to 6-mm or ¼" stainless steel tubing by means of
two Swagelok fittings. If necessary, copper or plastic tubing with very low
permeability can be substituted.
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