Michell Instruments Optidew User Manual

Optidew User’s Manual
Michell Instruments 31
OPERATION
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; you are looking to measure the Relative Humidity of a room
which is controlled by an HVAC vent at either end (see fi gure 25) you will
get very diff erent readings depending on whether the sensor is positioned
at point A, point B or point C. Point C provides the most representative
sampling point given that it won’t be disturbed by the vent or the door.
A
B
C
1
2
3
4
1. Door
2. HVAC Duct, air into room
3, 4. Ceiling Vents
Figure 25 Room measurement example
2. Gas speed – if you are planning on installing the sensor in a duct,
consider how fast the sample gas is moving through it. Excessive fl ow
speed will cause displacement of the condensate layer on the mirror,
leading to unstable measurement.
If this is the case, then a guard fi tted over the sensor can mitigate the
eff ects of excessive gas speed by dissipating the sample throughout
it’s surface area. An appropriate guard can be purchased from Michell
Instruments, contact your local representative.

Michell Instruments Optidew Specifications

General

Brand	Michell Instruments
Model	Optidew
Category	Measuring Instruments
Language	English