Michell Instruments SF82 Series, Руководство пользователя

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SF82 Transmitter User’s Manual
7 Michell Instruments
The basic considerations for each measurement type are as follows:
In-Situ
1. Dew-Point Sensor Position – will the sensor see an area of the environment that is
representative of what you want to measure?
For example, if the sensor is to be mounted into a glove box, there are three different positions
in which it could be installed – each giving a different measurement:
• Position A is on the purge inlet. In this position the sensor will confirm the dew point of the
gas entering the glove box but will not detect any leaks in the glove box itself, or any moisture
released from the work piece.
• Position B is on the gas outlet. In this position the sensor will be exposed to the gas leaving
the glove box and will therefore be detecting any moisture which has entered into the system
(e.g. ingress/leaks) or has been released by the work piece.
•
Position C is in the glovebox itself, in this position the sensor will be only detecting any moisture
in its immediate vicinity. Leaks not in close proximity to the measurement point may not be
detected as this moisture could be drawn directly to the outlet.
If the transmitter is to be mounted directly into a pipe or duct, then consider that the installation
point should not be too close to the bottom of a bend where oil or other condensate may collect.
Figure 8 Installation Location