Kahn Optidew Series, User Manual

Page: 23 / 88

Optidew User’s Manual
14 October 2019
OPERATION
2.4.3 Integral Sensor mounting
If the sensor is to be positioned into a sealed but open environment (glove box,
environmental chamber or area to be monitored) a female thread of M36 x 1.5-6H is
required to suitably thread onto the sensors mail M36 x 1.5-6g thread. The bonded
seal provided will require a good surface finish (0.8 Ra) across a minimum sealing face
of DIA 46.0mm to insure leak free operation up to the max operating pressure of the
sensor (25barg). The bonded seal will also require a strong hand tightening to insure
leak free sealing of the two mating faces.
Insure that the sensor is suitably secured to prevent any movement and that it is
located in a position that will see a representative flow of the sample to be measured.
2.5 Temperature Probe Installation
The temperature probe is supplied pre-wired and simply requires fitting to the connector
on the Optidew control unit prior to use.
Take into consideration how you will use the readings from your temperature probe
before installing it. If the measurement will be used in combination with the dewpoint
measurement to calculate % RH, then the temperature probe should be installed in
a location which is most representative of the temperature of your environment or
sample.
Be aware that when depressing the mirror temperature by more than 40°F the Optidew
dewpoint sensor will generate a small amount of heat in the surrounding area. Try to
situate the temperature probe upstream of the dewpoint sensor and at least 6 inches
away.
Refer to section 4.4.5 for more information on calculated parameters and which
measured inputs are used to derive them.
2.6 Pressure Transmitter Installation
Pressure transmitters are available for the Optidew in several ranges. Any 4-20mA
pressure transmitter can be wired into the Optidew control unit via the 4-pin M12
connector.
Kahn can supply a pressure transmitter with the Optidew, which is installed via a 1/8”
NPT male thread.
For ease of use, the dewpoint sensor and pressure transmitter should be installed so
they are operating at the same pressure; i.e. either both at atmospheric pressure or
both at line pressure.
For information on the pressure compensation feature refer to section 4.4.5.