Specifications

Instruction 0024-9460

Fyrite

INSIGHT

5.7 CO Sensor Calibration

Material required:

• Calibration kit, P/N 0024-7059

• Gas cylinder: 500 ppm CO in air, P/N 0024-0492

To improve the accuracy of the CO reading, we suggest that if the analyzer

will be primarily used for flue gas testing, then calibrate using 500 ppm

CO. If the analyzer, however, will be pri ma ri ly used for ambient testing,

then calibrate using 100 ppm CO.

Procedure:

1. If not already done, turn ON the analyzer and

display the CALIBRATION LIST screen per

Section 5.2.

2. Use the

buttons to highlight CO, and

then press ENTER to display the CALI-

BRATE CO screen.

“Measured” is the current CO reading,

while “Applied” is a known CO level

that will be applied for calibration

purposes.

3. Attach a 500 ppm CO cylinder to the regula-

tor of the calibration fixture.

4. Use the

and buttons to enter an Applied value that exactly

equals the concentration stamped on the CO cylinder.

The calibration range is from 20 to 1,000 ppm. An attempt to

calibrate outside this range will cause the message “Applied

Value High” (or Low) to appear at the bottom of the screen.

5. Wait until the Measured reading stabilizes and then press ENTER

to calibrate the CO Measured value to that of the Applied value.

The message “Good Calibration” should briefly appear.

If the sensor’s output is low, but still usable, then the message

“Good Calibration WARNING Low Sensor” will appear. The

sensor will now be marked as being Low in the DIAGNOS-

TICS screen.