Sierra Monitor Corporation 4501-XX, 4501-04, 4501-06, 4501-05 Installation, 20mA Connection, Page

Model 4501-XX Toxic Gas Sensor Module

4. INSTALLATION

4.1SENSOR MODULE LOCATIONS

The gas sensor module utilizes a diffusion type sensor which should be located close to either the expected source or destination of the gas hazard. If the gas is heavier than air, the sensor module should be installed within 24 inches of the ground or floor. If it is lighter than air, move it above 6’.

After optimum locations are determined based on the above recommendations, consideration should be given to placing the sensor modules in locations which are accessible for calibration service. Slight adjustments to the location of the sensor module may have little impact on effectiveness but major effect on accessibility.

•Modules should be placed in areas accessible for calibration.

•The cover should face out from the wall for easy access.

•Sensors should be pointed down and the conduit should include an inverse trap to reduce moisture (condensation) from accumulating in the electronics enclosure.

4.2WIRING

•Wire should be 16 AWG minimum at a maximum distance is 5,000 feet. Install conduit as required by local code or construction specifications.

•See figure 4-1 for typical 2 terminal and 4 terminal connections.

Figure 4-1

4-20 mA Connection

4.3ENCLOSURE INSTALLATION

To protect the transmitter and sensor assembly they should be removed from the enclosure and preserved until final installation and wiring termination.

Prior to installation and wiring:

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