Honeywell VA201T Calibration Handbook page 122

Calibration Handbook
5. Adjust the span at the control card to read the concentration of the gas applied.
6. Remove the Flow Housing and gas supply.
Gas
H2S
H2S
H2S
CO
CO
CO
Cl2
Cl2
O2
NH3
NH3
H2
H2
SO2
SO2
NO
NO2
NO2
If it is necessary to adjust the sensor set up because insufficient span or zero adjustment is available at the
control card, follow these instructions:
1. Open the sensor enclosure by unscrewing the sensor cap assembly from the sensor main body and
replace with a Gassing Cap (P/N: 2106D2114) and Flow Housing (P/N: 02000-A-1645).
2. If the output, with no gas applied, is not zero then adjust the zero potentiometer through the Gassing Cap
access holes (see following diagram) to obtain a zero indication.
3. Connect a gas cylinder of known gas concentration of approximately 50% FSD to the Flow Housing using
nylon or PTFE tubing.
Wind Speed Measured Speed
(mph) Using Pitot (m/s)
10
15
20
25
30
35
40
Test Gas Concentrations
Recommended
Range
Concentration
0 to 20ppm
0 to 50ppm
0 to 100ppm
0 to 100ppm
0 to 200ppm 100ppm
0 to 500ppm 250ppm
0 to 5ppm
0 to 15ppm
0 to 25% V/V 19% V/V
0 to 50ppm
0 to 1000ppm 500ppm
0 to 1000ppm 500ppm
0 to 10000ppm 3000ppm
0 to 15ppm
0 to 50ppm
0 to 100ppm
0 to 10ppm
0 to 50ppm
Test Gas Flow Rate
(L/min) Series 2000
4.4
6.7
8.9
11.1
13.4
15.6
17.8
Application
Test
Time
10ppm 3 min
20ppm 3 min
50ppm 3 min
50ppm 3 min
3 min
3 min
3ppm 10 min
10ppm 10 min
1 min
25ppm 10 min
10 min
3 min
3 min
10ppm 5 min
20ppm 5 min
50ppm 5 min
5ppm 5 min
20ppm 5 min
122
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Operating Temp.
Min. Max.
-20°C +50°C
-20°C +50°C
-20°C +50°C
-20°C +50°C
-20°C +50°C
-20°C +50°C
-20°C +50°C
-20°C +50°C
-15°C +40°C
-20°C +40°C
-20°C +40°C
-5°C +40°C
-5°C +40°C
-15°C +40°C
-15°C +40°C
-5°C +40°C
-15°C +40°C
-15°C +40°C
Sensepoint Toxic