Assessments - 1, GPA: 4
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The instrument contains a gas specific generator cell. Depending on the type of gas, the generator will produce, either electrochemically or thermally, a gas concentration above the TLV1-level. The response of a gas detector can be checked with the small gas concentration produced by the gas generator. However, since the gas generator does not produce a certifiable known gas concentration, it is not suitable for detector calibration. 3.2 How To Run a Gas Test • Insert the sensor of the gas detector into the adapter of the gas generator. • When the detector is pressed down, the generation of gas starts automatically. If you want to test the Compur Monitors gas detectors Monitox plus or Dositox, please use the switch pin extension included with the generator. Compur gas detectors Monitox S/SD and Minitox are tested without extension. If you want to check gas detectors of other manufacturers, please check whether it works with or without the switch pin extension. • The gas generator will produce gas for a period of 10 seconds. During gas generation, the green LED will turn on. If the red LED illuminates, the battery needs replacement. Note: .. If the generator cell is exposed to low humidity, it may dry out. Therefore, please cover the generator with the included humidity cap. Make sure the sponge inside the cap is always moist, but not dripping wet. Do not store or use a Compur gas generator in classified areas. 1 TLV = Threshold Limit Value 4. Maintenance In service is needed, please contact Compur Monitors Service in Munich or your local representative. Minor maintenance work such as battery replacement, or generator cell exchange, can be performed by observing the following instructions. Please observe the following notes: .. Use a grounded conductive pad. .. Wear a conductive wrist strap connected to your work pad. 4.1 Battery Replacement If the red LED turns on, the battery needs replacement. Internal battery (9V battery) 1 Remove the four screws on the backside of the instrument. 2 Separate the top and bottom halves of the generator housing. (Use caution as the LED wires are attached to the top case) 3 Remove the old battery. 4 Insert the new battery. 5 Attach the top cover and tighten the screws. External battery pack (COCl2 only) 1 Unplug the battery pack from the gas generator and remove the four screws on its backside. 2 Open the battery pack and remove the old batteries. 3 Insert the new batteries (4x1,5 V size C), close the battery pack and tighten the screws. .. For the 1.5 V size C batteries, it is recommended to only use Duracell Ultra M3 or Varta High Efficiency Alkaline. Use of other batteries may cause flashing of the battery LED during a gas test. 4.2 Generator Cell Replacement The generator cell has an approximate life time of 1 year or 2,500 tests. After this time it needs replacement. It also needs replacement, if a gas detector known to be good does not respond to a gas test. 4.2.1 H2S and HCN Generator (see Picture 1) 1 Loosen the 4 screws on the backside of the instrument and separate the two halves. (Use caution as the LED’s are attached to the top case) 2 Remove the battery. 3 Unsolder the 2 wires from the old generator cell and remove the tubing from the pump. 4 Unsrew the 4 screws securing the PCB and remove the PCB. 5 Unscrew the 3 screws of the generator cell, which secure it to the bottom case, and remove the old generator cell. Insert the new generator cell and tighten the 3 screws. 6 Reinsert the PCB and tighten the screws. Please make sure that the switch pin has not moved and that it easily activates the switch on the PCB. 7 Reconnect the battery. 8 If required, adjust the generator current to the following specifications: - Connect current meter to PCB pin 4 (center pin) and pin 7 (left pin). - Press switch S101 and adjust generator current with potentiometer R114 to the applicable current: H2S = 3,5 mA; HCN 100 ppm = 0,7 mA; HCN 20 ppm = 0,35 mA 9 Solder the wires of the generator cell to the PCB pins: - black cable to pin 4 (center pin) - yellow cable to pin 7 (left pin) Connect the tubing to the pump port marked “out”. 10 Close the housing of the generator and tighten the 4 screws in the back. Note: .. Whenever you have done maintenance work on a gas generator, test the function with a working gas detector. The detector should give an alarm within 10 seconds. 4.2.2 CO, Cl2 and NO2 Generator (see Picture 2) The CO, Cl2 and NO2 generator cells contain an internal fan. When replacing, please proceed as follows: 1 Loosen the 4 screws on the backside of the instrument and seperate the two halves. (Use caution as the LED’s are attached to the top case) 2 Remove the battery. 3 Unsolder the 3 wires from the old generator cell. 4 Unscrew the 4 screws securing the PCB and remove the PCB. 5 Unscrew the 3 screws of the generator cell , which secure it to the bottom case, and remove the old generator cell. Insert the new generator cell and tighten the 3 screws. 6 Reinsert the PCB an...