Bacharach GDC-350 Operation Manual

Contents

Bacharach GDC-350 Operation Manual Manual pdf 27 page image

GDC-350 Operation Manual5909-9000 Rev 1 214.5. Adjusting Alarm SetpointsThe GDC-350 is configurable as a single or dual channel detector as such there aretwo ascending gas alarm set points and two descending gas alarm set points. Almostall installations of the GDC-350 will use the factory default alarm set points. Defaultset points are as follows.SENSOR LOW ALARM HIGH ALARM RANGECaron Monoxide (CO) 25 ppm 100 ppm 200 ppmNitric Oxide (NO) 35 ppm 50 ppm 100 ppmNitrogen Dioxide (NO2 ) 0.7 ppm 1.5 ppm 10 ppmSulfur Dioxide (SO2 ) 1.0 ppm 5.0 ppm 20 ppmPropane (C3 H8 ) 10% LEL 20% LEL 50% LELMethane (CH4 ) 10% LEL 20% LEL 50% LELRefrigerants 500 ppm 1000 ppm 2000 ppmTemperature °C 30 °C 40 °C 60 °CTemperature °F 75 °F 90 °F 100 °FIf the GDC-350 has been equipped with an LED digital display, set values accordingto what is displayed. If the GDC-350 does not have a digital display, you will need toattach volt meter leads to the two test points (TP1 and TP2) located just below thehigh alarm relay (RLY2) on the main circuit board.Figure 4-3. Locations of Test Points TP1 and TP2Move the jumper on the lower bank (J6) from its resting position (P1) and place it onthe appropriate jumper position as indicated in the table on the previous page. Next,move the J7 jumper from its resting position to the desired position. Then use the UPor DOWN push-buttons to set the desired alarm value.To make additional changes to the sensor selected via J6, repeat the following steps: move J7 to the appropriate position use the UP or DOWN push-buttons to set the desired alarm value.