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Instruction 24-9448 5-3
Calibration
play the CALIBRATE PRESSURE screen.
“Measured” is the pressure value currently
being detected by the pressure sensor, while
“Applied” is a known value of pressure that
will be applied for calibration purposes.
4. With both the –∆P and +∆P ports open to
the atmosphere, observe that the current
Measured pressure reading should be 0
±0.01 inwc. If necessary, zero the pressure
sensor per Section 4.6, and repeating Steps 2
thru 4.
5. Connect the hose from the manometer to
the +∆P port and apply a negative pressure
to this port by adjusting the bellows for a
manometer reading of –4.00 ±2.00 inwc.
6. Use the and buttons to enter an
Applied value that exactly equals the
manometer reading.
The calibration range is from –6 to –2 inwc
(–15 to –5 mb). An attempt to calibrate outside this range will cause
the message “Bad Calibration Wrong CAL Entry” to appear in the fol-
lowing step.
7. Wait until the Measured reading stabilizes, and then press ENT to cali-
brate the pressure sensor’s Measured value to that of the Applied value;
after which the message “Good Calibration” should briefly appear fol-
lowed by the CALIBRATION LIST screen being re-displayed.
8. Remove calibration equipment.
Figure 5-1. Pressure Sensor Calibration Equipment
POWER
P
T-STACK T-AIR
GAS
4
3
2
1
0
-1
-2
-3
-4
Parts:
1. 3/16" I.D. Tubing
2. Tee
3. Barbed Hose Connector
4. Bellows
5. Manometer
1
2
3
4
5
CALIBRATE PRESSURE
Measured 0.00 inwc
Applied -4.00 inwc
06/27/06 11:55:30 PM
PRINT
F1 F2 F3
CALIBRATION LIST
Pressure
T-Stack
T-Air
CO-LO
SO2
NO
NO2
(more)
MENU
F1 F2 F3