ATI Technologies B12-70 O & M Handbuch - Seite 16

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Model B12-70 Wet Acid Gas Transmitter

SENSOR RESPONSE TEST

While zero and span adjustments are required only periodically, gas sensors should be checked

regularly for proper response. The response test can be done using powdered calcium hypochlorite

(HTH) available from any swimming pool supply.

The sensor response test will create a condition where alarm relays will be activated unless

they are inhibited. To observe the response at the transmitter without display, it is necessary to connect a

DVM to the test points indicated in Figure 6. If the transmitter is supplied with the LCD option, no DVM is

required.

Place a teaspoon of calcium hypochlorite into a plastic bottle and keep the bottle capped until

ready to test the sensor. Open the bottle and place the mouth near the sensor. The DVM reading will

rise rapidly. Immediately remove the bottle as it is best to expose the sensor to the high concentrations

as briefly as possible. If the sensor does not respond when the bottle is held near the sensor, the sensor

membrane and electrolyte should be replaced.

O & M Manual

-Release E, 7/15

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