3M W-2806/07006 Petunjuk Pengguna - Halaman 13

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Calibration

Calibrate the monitor in the temperature range in which it will be used. After each adjustment

in the following steps, allow time for the changes to stabilize. Recheck all adjustments. Turn

monitor on and allow at least 5 minutes warm-up before calibration and adjustments are made.

Zero Adjustment

Remove sample tube from the black tube lock collar on top of the flow meter. Introduce a sample

of zero air to the sample tube (see User Instructions for the 3M

Calibration Kit 529-04-48 or

529-04-49). The sample flow should be between 0.5 and 1.5 scfh.

Verify that the green NORMAL light is on, the red ALARM light is flickering about once a second

and the display is showing "00". If the display is showing other than "00" , adjust the ZERO

potentiometer (next to the display) so that the reading is "00" . Clockwise adjustment increases

reading. Notice that the display jumps from 00 to +02 or to –02 (monitor does not display –01 or

+01). Try to set the potentiometer midway between the two extremes. Remove the zero air sample.

Span Adjustment

Introduce a known sample of 50 to 150 ppm CO to the sample tube (see User Instructions for the

Calibration Kit 529-04-48 or 529-04-49). The sample flow should be between 0.5 to 1.5 scfh.

Verify that the green NORMAL light is off, the red ALARM light is on full bright and the

stabilized reading, after approximately one minute, is equal to the known concentration of CO.

If the display is showing a difference, adjust the SPAN potentiometer (next to the display) to

obtain proper value. Turn clockwise to increase reading. If the span adjustment cannot be made

as indicated, the sensor needs to be replaced; make sure this is not happening due to an empty

span gas cylinder. See Replacement Part section of this User Instruction.

Remove the known sample of CO and reconnect the sample tube to the black tube lock

collar on top of the flow meter. The instrument is now properly adjusted for use.