Intec Controls PolyGard AT-3300 V3, User Manual

Page: 7 / 14

Example:
Measuring range 100 % LEL
Test gas concentration 40 % LEL (methane)
Control voltage: Signal start 2 V / 4 mA 104 mV
Control voltage: Signal start 0 V / 0 mA 80 mV
Signal start 2 V / 4 mA Signal start 0 V / 0 mA
160 (mV) x 40 (% LEL) + 40 (mV) = 104 mV 200 (mV) x 40 (% LEL) = 80 mV
100 (% LEL) 100 (% LEL)
5.2 Calculation calibration gas < >target gas (backup calibration)
ÜW
Gas
= KAL
Gas
x ( K
Gas
/ Ü
Gas
) ÜW
Gas
= Target gas % LEL
KAL
Gas
= Calibration gas % LEL
K
Gas
= Factor relative sensitivity % LEL calibration gas
Ü
Gas
= Factor relative sensitivity % LEL target gas
Example:
Calibration gas 30% LEL/Methane
Target gas Propane
30 % LEL/methane x (100/ 63 ) 47.6 % LEL/Propane
The factor of the relative sensitivity can be read from the table cross sensitivity data.
Cross-sensitivity data AT-3 3 XX V3
Type of gas/vapour Chemical mark
Sensitivity
1
%
% LEL/Methane
LEL/
% v/v
Gas Density
Air = 1
Mounting
high
Acetone (CH
3
)
2
CO 50 2.60 2.00 Floor
Acetylene C
2
H
2
47 2.00 0.90 Ceiling
Benzene C
6
H
6
44 1.30 2.70 Floor
Cyclohexane C
6
H
12
44 1.30 2.91 Floor
Ethylene CH
2
81 2.30 0.98 Ceiling
Ethane C
2
H
6
82 3.00 1.05 Floor
Ethyl Alcohol C
2
H
5
OH 75 3.30 1.59 Floor
Ethyl Acetate CH
3
COOC
2
H
5
46 2.20 3.04 Floor
Ethylene Oxide C
2
H
4
O 52 2.60 1.52 Floor
Hydrogen H
2
107 4.00 0.07 Ceiling
JP8 25 0.7
JET_A 46 0.7
Methane CH
4
100 4.40 0.55 Ceiling
Methanol CH
3
OH 84 6.70 1.11 Floor
n-Butane C
4
H
10
51 1.80 2.11 Floor
n-Heptane C
7
H
16
44 1.05 3.46 Floor
n-Hexane C
6
H
14
46 1.02 2.98 Floor
n-Octane C
8
H
18
38 0.95 1.66 Floor
Propane C
3
H
8
63 1.70 1.55 Floor
n-Pentane C
5
H
12
50 1.40 2.49 Floor
1
according to information of the sensor manufacturer.
The table does not claim to be complete. Other gases can have an influence on the sensitivity, too.
7KH indicated sensitivity data are only standard values referring to new sensor elements.
Specifications subject to change without notice. | USA 151203 | Page 7 of 14
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AT-3300_V3 – UserManual
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