Optidew User’s Manual
Michell Instruments 13
OPERATION
2.4.3 Integral Sensor mounting
If the sensor is to be positioned into a sealed but open environment, e.g. glove box,
environmental chamber or area to be monitored, tap a hole for fitment of the widest
thread (M36 x 1.5-6g), and seal using the bonded seal provided.
Ensure 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 dew point
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°C, the Optidew
dew-point sensor will generate a small amount of heat in the surrounding area. Try to
situate the temperature probe upstream of the dew-point sensor and at least 150mm
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.
Michell can supply a pressure transmitter with the Optidew, which is installed via a 1/8”
NPT male thread.
The pressure source should be installed with consideration to the calculated values
which will be used. For example, if the dew-point sensor is installed at process pressure,
then the pressure sensor should be installed into the sample block. However if the if the
dew-point sensor is installed at a different pressure to the process, the pressure sensor
should be installed in a different location which is at full process pressure.
For information on the pressure compensation feature refer to section 4.4.5.
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