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Instruction Manual 0 6.1 Gas Sensor Module Locations The gas sensor module is a diffusion type sensor that should be located close to the anticipated source or destination of the gas hazard. For heavy gases such as H 2 S install the module within 24 inches of the ground. For lighter gases such as CO and com- bustible gases use a higher elevation. After optimum locations are determined based on the above recommendations, consideration should be given to placing the sensors in locations that are accessible for calibration service. Slight adjustments to the location of the sensor may have little impact on effectivity but major effect on accessibility. y. 1. Model 20X Series Where possible sensor modules should be installed with the sensor facing vertically down. The lid of the sensor module should face out for easy access. Sensors may be mounted directly onto the end of a vertical conduit, or bracketed to a vertical surface using the two mounting flanges. Insure that the body of the enclosure is at least 1" from the wall so that the sensor assembly can be rotated for removal and replacement. 2. Model 20OX Series Where possible sensor modules should be installed on a vertical surface. The module can be mounted either using screws through the mounting flanges or using an adhesive tape provided with the unit. These modules are intended for use with the plug-in AC/DC power supply shipped connected to the unit. The module should be mounted in an area conve- nient for the plug-in power supply. The power sup- ply is removed if connecting the module to a Sierra Monitor Alarm Panel. If the power supply provided by Sierra Monitor is not used, user must employ any wiring methods according to the US NEC and the Canadian CEC and Class 2 power source re- quirements. 6.3 Wiring For installations where the distance from the con- troller to the sensor is greater than 500 feet, 18 AWG cable is recommended. The terminal strip on the electronics board in the module. The wiring must be connected as indicated in Figure 6.1 depending upon the controller or relay configuration being used. 6.4 Power Supply The power supplied by the controlling device or an external power supply must meet the following speci- fications: Voltage: 9 - 24 VDC (It must be a Listed/Certified Class 2 output power source. Current: 250 mA The Model 20OX Series includes a plug-in AC/DC power supply. Terminal Function T131-1 + VDC 9 — 24 T131-2 GND OVDC TB2-1 Relay NC (Normally Closed) or Out ut to Model 2102 Safe TB2-2 Relay Common T132-3 Relay NO (Normally Open) or Output to Model 2102 Alarm Table 6.1 Interconnect wiring from the controller to the module is by 4 conductor 22 AWG (or lower AWG) cable, conduit as necessary. Shielding is not required. Page: 9 20X/20OX Gas Sensor Modules (08/04)