Model 2180A
9
• Acid Vapors
• Caustic liquids or vapors
The presence of such materials in an area does not preclude the use of a sensor. The
feasibility of using a sensor in such areas must be determined by an analysis of the
specific factors in each application. Consult General Monitors before attempting any such
installation.
Sensors used in these areas usually require more frequent calibration checks than
normal and typically have a shorter life. In many such applications the normal two-year
warranty does not apply.
CAUTION: General Monitors discourages the painting of sensor assemblies. If the
sensor head is painted-over, gas will not be able to diffuse into the sensor
and many paints contain lead, which can poison a sensor.
2.7 Sensor Installation
The standard sensor assembly consists of a sensor housing (GMI P/N 10252-1) and
sensor (P/N 50445-1, -5, or -9), (Figure 4).
NOTE: When installing the sensors be sure to leave enough clearance from the ground
and walls to be able to fit the calibration bottles supplied with the system onto the
sensor head.
The dash (-) numbers correspond to full-scale ranges of 0-100, 0-50 or 0-20 ppm,
respectively. The sensor assembly is recognized safe for United States National Electric
Code Class I, Division 1 and Division 2, Groups B, C, and D hazardous areas, and is
approved by the Canadian Standards Association (CSA).
NOTE: Each H
2
S Sensor is shipped with a red plastic cap fitted over the sensing head.
Inside the cap is a desiccant. DO NOT remove this cap until power has already
been applied to the system. Save the cap and re-cap the sensor when powering
down the system or if the system power is off for an extended period of time. The
desiccant packs may be saved and reused providing that they have been stored
in a dry area.
CAUTION: Sensors should ALWAYS be mounted pointing downward to prevent the
collection of moisture or contaminants.
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