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INSTALLATION
2.5
Sensor Installation
The dew-point sensor contains the optical system and the chilled mirror. It is fi tted with
a bayonet connector to allow easy and secure connection to the instrument using the
supplied sensor cable.
The available options for sensor installation are:
•
via a permanently installed sample port into which the remote sensor can
be inserted or
•
via a sensor block immediately attached to the sensor around which the
sample circulates or
•
in an ambient environment where the sample is diffusing through the
sensor.
If the instrument is to monitor the conditions in an environment, the sensor must be
located in a representative position, i.e. not under an air conditioning vent. NOTE: It is
recommended that the sensor is fi tted with either an HDPE or stainless steel
sintered guard to baffl e it from fl owing air currents.
If the sensor is to be mounted directly into the process, tap a hole for fi tment of the
widest thread (M36 x 1.5-6g), and seal using the Dowty washer provided.
1.
Before connecting ensure that the sensor mirror surface is fully cleaned.
See Section 5 (Maintenance) for cleaning details.
2.
If the sensor is installed within a sealed gas system it must be fi xed
securely without any possibility of leaks. Ensure that the sample fl ow
across the sensor is correctly regulated.
3.
The gas connections for the remote sensor are either via a permanently
installed sample port into which the remote sensor can be inserted or via
a sensor block (see Figure 3) immediately attached to the sensor around
which the sample circulates. Gas sample entry into the sensor block is
via couplings that can be installed via ⅛" NPT female threads. A Dowty
washer is provided to seal the connection between the sensor and the
block.
4.
If the sensor is to be positioned into a sealed but open environment, e.g.
glove box, environmental chamber or area to be monitored, ensure that
the sensor is suitably secured to prevent any movement and that it is
located in a position that will see a representative fl ow of the sample to
be measured.
5.
Connect the remote sensor cable to the sensor and to the instrument via
the connector on the rear panel. The connector is a 2-part bayonet fi tting.
Insert the cable part and rotate until the polarization lugs engage. Rotate
the outer collar of the cable-mounted part in a clockwise direction, and, at
the same time, push the connector halves together to assist the mating.
The connection is made in a ¼ of a turn of the outside collar part.
10
Optidew Series User's Manual
97430 Issue 2, March 2017
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