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Instruction 24-9351
PCA
5.10 Calibrate Draft
(For PCA Models 15, 25, 35, 45, 55 & 65)
Material Required:
• Calibration Fixture (Section 5-2)
• Bellows (adjustable)
• Micromanometer Range: ±20 mb (±8 in. H
2
O column)
Accuracy: ±0.025 mb (±0.01 in. H
2
O column)
Procedure:
IMPORTANT! In Step 1, do not connect the draft calibra-
tion fixture to the analyzer until the Calibrate Draft Screen
has been selected and displayed.
1. Enter the Calibrate Menu Screen per Section 5.3. Then choose to
calibrate the draft sensor.
2. With the Calibrate Draft Screen displayed, connect the hose from the
calibration fixture to the analyzer’s DRAFT port; then adjust the
bellows for a micromanometer reading of –10 mb (–4" H
2
O column).
3. Wait until the MEASURED reading on the screen stabilizes. Then use
the st and keys to enter an APPLIED reading* which equals the
Micromanometer reading.
Typical CALIBRATE DRAFT Screen During Calibration Procedure:
CALIBRATE DRAFT
MEASURED - 9.00 MB
APPLIED -10.00 MB
4. Press the key to calibrate the analyzer’s MEASURED value to
that of the APPLIED value. At this time the Calibrate Menu Screen is
redisplayed.
5. When all desired calibrations have been completed, press to exit to
the Combustion Test Screen.
* The calibration range for this screen is –5 to –15 mb, any attempt to
calibrate outside this range will cause the unit to display an error
message.
Calibration
5-11