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Instruction 55-9002 23

Gas Pup

Gas Calibration Procedure

The Gas Pup has an auto-calibration feature that ensures proper calibra-

tion of the instrument. After setting up the calibration equipment as

previously described, proceed with the calibration procedure as follows:

1. Before turning ON the instrument, be sure that the calibration

equipment is not connected to the instrument, and that the instru-

ment is in an area of fresh air.

Important! Calibration should be performed in an area of fresh

air. If the quality of the surrounding air is unknown, then zero air

should be applied to the instrument's gas inlet port before the

instrument is turned on and allowed to flow during the auto-start

sequence (flashing “AS” in the READING window). This will

require a second regulator to be connected to a zero-air cylinder.

2. Press the key to turn ON the Pup. Before proceeding to Step 3,

wait until the instrument enters its auto-start period (flashing “AS”

appears in the READING window).

3. See Figures 19 and 20. Auto calibration is started by pushing

the key at any time while “AS” is being displayed. Observe that the

letter “C” appears in the RANGE window, indicating that the instru-

ment is ready for calibration at the conclusion of the auto-start

sequence. Calibration gas must not be supplied to the instrument

before this time, or the sensor’s zero setting will be in error.

4. Following the auto-start period, the instrument will display a steady

“AC” for about 10 seconds and display “L” (for LO%) in the RANGE

window. The default range is LO% (Figure 19), but if you are calibrat-

ing the HI% range (Figure 20), then press the key until “h” is

displayed.

WARNING: In the following steps, be sure to apply the correct

concentration of gas for the range being calibrated as listed

below. Failure to apply the correct gas will cause inaccurate gas

readings.

• LO%: apply 2.5% gas while showing “L” in the RANGE window

• HI%: apply 100% gas while showing “h” in the RANGE window

Calibration

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