Specifications

PCA

5.4 Pressure Sensor Calibration

This procedure calibrates the pressure sensor to a known pressure value.

Material Required:

• Bellows

• Manometer

• Range: ±8 in. of water column (±20 mb)

• Accuracy: ±0.01 in. of water column (±0.025 mb)

Procedure:

NOTE: The unit-of-measure for pressure is selected per

Section 3.7. In the following procedure inwc is selected, but

note that any unit-of-measure can be used for calibration

purposes.

1. Assemble the pressure sensor calibration equipment as shown in

Figure 5-1, but DO NOT connect the analyzer to the calibration

equipment at this time.

2. If not already done, turn ON the analyzer and display the

CALIBRATION LIST screen per Section 5.2.

3. Use the ▲▼ buttons to highlight

Pressure, and then press ENT to

display 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 4.8, 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.