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The concentration of the span gas must be equal to the alarm point desired. The equivalent substitute gas is 80 ppm Hydrogen (H2) for the Model 2050 and 150 ppm Carbon Monoxide (CO) for the Model 2060. Calibration requires application of the span gas to the sensor and adjustment of the sensitivity adjustment potentiometer. Warning: During calibration the alarm will turn on and remote alarms connected to the alarm relays will be activated. Disable the remote alarm if necessary. Fig. 4-1 Location of Calibration Voltmeter Connections and Adjustments Page: 5 2050/2060 Gas Monitors (5/04) Instruction Manual 4.4Equipment Required The following tools and equipment will be required for calibration: -Jewelers Screwdriver -Calibration Gas -Calibration gas delivery system For accurate calibration use a gas mixture at the required concentration mixed in an air balance, rather than with an inert gas like nitrogen. This gas and the required delivery equipment such as the Model 120026 Calibrator is available from Sierra Monitor Corporation. 4.5Alarm Calibration Procedure 1. The monitor should be in the safe condition prior to calibration (green LED “ON”). -Be sure that the area is non-hazardous before proceeding. 2. With the monitor in operation, expose the sensor to a sample of calibration gas. Apply calibration gas directly to the sensor insuring that the delivery cup loosely covers the sensor. Use 80 PPM H2 for the Model 2050 and 150 PPM CO for the Model 2060. 3. The red LED on the face of the monitor should turn "on". If the alarm occurs within 18-20 seconds and stops within one minute of the removal of the calibration gas, the monitor is in calibration and requires no further adjustment. 4. If the monitor fails to alarm within 90 seconds of the application of the gas adjust the potentiometer counter clockwise until the alarm turns "on". 5. If the monitor fails to stop alarming within one minute of the removal of the gas adjust the potentiometer clockwise until the alarm stops. 6. After adjustment, repeat steps 4 and 5 to verify calibration. 7. When the calibration is complete, reconnect any alarm equipment as necessary. 2050/2060 Gas Monitors (5/04) Page: Instruction Manual 5.0 SERVICE 5.1 Sensor Replacement The gas sensor needs replacement when: -It is no longer possible to obtain correct calibration -The failed sensor alarm (oscillating red/green LED) is on -The sensor output signal is noisy, causing incorrect gas alarms. To replace the sensor: 1. Confirm that the system power has been removed. 2. Remove the cover from the main enclosure. 3. Unplug the sensor connector on the lower right hand corner of the electronics board. 4. Unscrew the sensor assembly from the end of the enclosure. 5. Reverse the preceding steps to install the new sensor assembly. 6. Restore power and allow a minimum of 24 hours for stabilization before recalibration. The calibration should be re-verified after 6 days of continuous operation. Figure 5-1 Model 2050/2060 Electronics Board Connections Page: 7 2050/2060 Gas Monitors (5/04) Instruction Manual 6.0 INSTALLATION 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 H2S install the module within 24 inches of the ground. For lighter gases such as CO and combustible 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. 6.2 Mounting To mount the monitor, remove the four svrews in the cover plate and move the cover plate aside. Use screws through the monitoring holes visible in the four corners of the housing to mount the monitor to a wall. -The installation must meed any hazardous environmental codes for AC/DC electrical instrumentation. 6.3 Wiring 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. For installations where the distance from the controller to the sensor is greater than 500 feet, 18 AWG cable is recommended. Terminal Function TB1-1 + VDC (9 – 24) TB1-2 GND (0VDC) TB2-1 Relay NC (Normally Closed) or Output to Model 2102 Safe TB2-2 Relay Common TB2-3 Relay NO (Normally Open) or Output to Model 2102 Alarm Table 6.1 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 mu...

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