Specifications

Instruction 24-9388

Fyrite Pro

5.6 CO Sensor Zero & Calibration

(Model 125E only)

Material Required: • Cylinder of 100 ppm (P/N 51-1994) or

500 ppm (P/N 24-0492) CO calibration gas

• Calibration Kit, P/N 24-7059

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 primarily used for ambient testing,

then calibrate using 100 ppm CO.

Procedure:

1. With the analyzer sampling fresh air, enter the Calibration Mode as

described in Section 5.1. Then repeatedly press the ENTER button

until “CO” appears in the upper-left side of the display.

CAL

p m

2. Allow the pump to run and sample fresh air for at least 1 minute.

3. Use the  and  buttons to set the displayed value to 0 ppm.

4. Do one of the following:

a. End this procedure and save the new zero value by holding down

the ENTER button for 2 seconds; after which, the analyzer enters

its Run Mode.

b. Continue with Step 5 to span the CO sensor on a known concen-

tration of carbon monoxide.

5. Set up the Calibration Kit with 100 or 500 ppm CO as described in

the instructions supplied with the kit.

6. Connect the tubing of the Calibration Kit to the GAS inlet of the

analyzer; then adjust the regulator for approximately 2 SCFH of

excess flow (see Figure 5.1).

7. After the analyzer has stabilized (2 to 3 minutes), use the  and

 buttons to set the displayed value to match the CO concentration

stamped on the gas cylinder.