ABB Endura AZ40 Manual page 20

Setting up and recording pneumatic values
Referring to Fig. 22.
1. Perform a leak test on all pneumatic connections.
2. Attach a pressure measuring device to sensor assembly
instrument air supply tee fitting A. Verify that the instrument
air supply pressure is 207 ±3 kPa (30.0 ±0.5 psi) and adjust
the pressure if necessary.
3. Attach a pressure measuring device with a range of 0 to
–69 kPa (0 to –10 psig) to aspirator suction pressure port
B. Verify that the suction pressure is –51.7 to –65.5 kPa (–
7.5 to –9.5 psig).
Record the suction pressure in Table 4.
4. Attach a pressure measuring device (inches H
port C. Measure the pressure with instrument air on to
obtain the sample pressure.
Record the sample pressure in Table 4.
5. Measure the pressure at test gas port C with the instrument
air turned off to obtain the duct pressure. Verify that the
sample duct is –5 to 5 kPa (–20 to 20 inches H
Turn the instrument air back on after taking this
measurement.
Record the duct pressure in Table 4.
6. Calculate the filter pressure drop by subtracting the sample
pressure from the duct pressure. Verify that the filter pressure
drop is less than 2 kPa (8 inches H
Record the filter pressure drop in Table 4.
Parameter
Sample pressure
Duct pressure
Filter pressure drop
(duct pressure – sample pressure)
Aspirator suction pressure
Minimum sample gas flowrate
Table 4 Sensor assembly pressure and flow data
20
O) to test gas
2
O).
2
O).
2
Date
____________ kPa (in. H O)
2
____________ kPa (in. H O)
2
____________ kPa (in. H O)
2
____________ kPa (psig)
____________ SCFH (i/min)
Fig. 22 Pneumatic value check points on AZ40 sensor
New analyzer
_____
_____
0.5 kPa (in. H O)
2
55 to 69 kPa (8 to 10 psig)
3.5 to 4.5 SCFH (1.6 to 2.1 i/m)
–
+
+
–
Pressure and flow limits
_____
±5 kPa (±20 in. H O)
2
2 kPa (8 in. H O)
2
34 to 69 kPa (5 to 10 psig)
2.5 to 4.7 SCFH (1.2 to 2.2 l/m)
CI/AZ40-EN Rev. A