Specifications

Instruction 24-9388
41
Fyrite Pro
5.7 Draft Calibration
Material Required: • Bellows
• Micromanometer
Range: ±20 mb (±8 in. H
2
O column)
Accuracy: ±0.025 mB (±0.01 in. H
2
O column)
Procedure:
1. Set the draft units to “mB” per Section 3.5.4.
2. Enter the Calibrate Mode per Section 5.1, and then
press the ENTER button until “mB” appears on the
right-hand side of the display.
3. If necessary, zero the draft channel by using the  and  buttons
to adjust the reading to 0.00 ±0.02.
4. Set up the analyzer and its test equipment per Figure 5-2.
5. Use the bellows to apply a positive pressure of 10.00 mB (4.00 in.
H
2
O), and then use the  and  buttons to adjust the analyzer’s
displayed value to match the reading on the manometer.
6. Remove pressure and repeat Steps 3 thru 5 until the desired read-
ings are obtained.
7. Press ENTER to store the new calibration values and move to the
next calibration screen, or hold down ENTER for 2 seconds to store
the new calibration values and enter the Run Mode, or press the
I/O button to exit the Calibration Mode and turn OFF the analyzer
without saving the changes.
Figure 5-2. Draft Calibration Equipment
1
2
3
1
Manometer
Bellows
Parts Shown:
1. Tubing*
2. Tee*
3. Fitting, “+” Pressure Port
* Contained in Calibration Kit