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NOTE: Part Numbers 10001-1, 10058-1, and 10022-1 sensors are CSA C22.2 No. 152
certif ied and part numbers 10001-1 and 10058-1 are additionally certified to FM
6320. Part Number 10252-1 sensor housing is normally used in the Western
Hemisphere. Special ATEX approved housings are normally used in Europe.
7.7 Accessories
7.7.1 Calibration Equipment
Calibration accessories may be purchased from General Monitors. Contact the factory, or
your local representative, for technical or ordering information.
The Portable Calibration Chamber is used to calibrate sensors f or any specific
combustible vapor, which has a flash point below ambient temperat ure. The customer
must provide his own sample of the liquid to use with the chamber. GMI provides a micro-
liter syringe f or exact measurement of volumes to be used. Instructions f or use are
provided with the chamber.
The portable purge calibrators are available f or several common gases, including
hydrogen, methane, ethane, propane and butane. The portable purge calibrator is a
ready-f or-use assembly, including a lecture bottle containing approximately 50% LEL of
the gas ordered, plus regulator and an adapter, which fits o ver the sensor. Replac ement
cylinders are also available.
7.7.2 Sensor Covers
The inf ormation below is of a general nature. GMI, or your local representative, should be
contacted for specific recommendations:
NOTE: If sensor covers are used, they should remain in place during calibration. If they
are going to be cleaned, the sensor should be recalibrat ed af t er t he sensor
cover is re-installed. Although several of the available covers do not af f ect
sensitivity or response-time themselves, accumulations of dust, dirt, water, etc. ,
may do so.
7.7.2.1 Dust Guard Assembly (P/N 10110-1)
The Dust Guard assembly is a simple, threaded stainless steel (type 303) cylinder wit h a
disposable wire screen at one end. It is easily unscrewed for cleaning and/or replacement
of the screen. The screen material is stainless steel (type 316) with a nominal 40-micron
mesh. This accessory is specially designed to prevent dust and particulat e m at ter f ro m
reaching the sensor flame arrestor. Such debris can plug the screen and limit the amount
of gas reaching the active surface of the sensor. When the Dust Guard is inst al led, this
problem is minimized and sensor response is virtually unchanged. The Dust Guard is
also available in a kit with twelve replaceable screens. It can be used as an effective
windscreen, and is recommended for corrosive, windy or high temperature environments.
A typical application would be in the area surrounding a drying oven.
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