Self-Test A-4.4 Combustible Gas Indicators

Complete Self-Test A-4.4 and check your answers.

1. What type of gas detector requires a separate hydrogen gas cylinder to operate?
   1. Infrared
   2. Electrochemical
   3. Electrocatalytic
   4. Flame ionization

    

2. What type of sensor does not have to be placed into the gas to detect it and can be used for remote sensing at distances up to 30 metres?
   1. Infrared
   2. Electrochemical
   3. Electrocatalytic
   4. Flame ionization

    

3. To ensure proper zero, you must always start the detector in a clean-air environment.
   1. True
   2. False

    

4. For detectors that use Geiger-style ticks: as the sensor head moves closer to a leak source, the tick rate will decrease.
   1. True
   2. False

    

5. All gas leak detectors require the sensors to be replaced by an authorized service centre.
   1. True
   2. False

    

Answer Key: Self-Test A-4.4 is on the next page.