Dräger Pac 7000 - Sensor Specifications and Instrument Configuration

7
12.3 Sensor Specifications and Instrument Configuration
Principle of measurement is an electrochemical 3-electrode sensor. Oxygen (O
2
) cannot be measured in the presence
of Helium (He)!
The Type-Examination-Certificate covers the measuring function for Oxygen enrichtment and defficiency.
CO H
2
S O
2
CO LC
Indication range 0 ... 1999 ppm 0 ... 200 ppm 2 ... 25 vol.-% 0 to 1999 ppm
Certified measuring range 3 to 500 ppm 1 to 100 ppm 2 to 25 vol. % 3 to 500 ppm
test gas concentration 20 to 999ppm 5 to 90ppm 10 to 25 vol.% 20 to 999 ppm
factory set calibration concentration 100 ppm 20 ppm 18 vol.% 100 ppm
Temperature range, operation –20 ... 50
o
C
–4 ... 122
o
F
–20 ... 50
o
C
–4 ... 122
o
F
–20 ... 50
o
C
–4 ... 122
o
F
–20 to 50 °C
–4 to 122 °F
Alarm Threshold A1
2)
30 ppm 5 ppm 19 vol.-%
1)
30 ppm
acknowledgeable Yes Yes No Yes
latching No No Yes No
Alarm Threshold A2
2)
60 ppm 10 ppm 23 vol.-% 60 ppm
acknowledgeable No No No No
latching Yes Yes Yes Yes
TWA Threshold A1
2)
30 ppm
8 hours
10 ppm
2 hours
No 30 ppm
8 hours
STEL Threshold A2
2)
60 ppm 10 ppm No 60 ppm
No. of STEL periods 4 4 No 4
Average STEL duration 15 minutes 15 minutes No 15 minutes
Warm up time (switch on) 20 seconds 20 seconds 20 seconds 20 seconds
Warm up time (sensor or battery change) 15 minutes 15 minutes 15 minutes 15 minutes
Reproducibility
Zero point:  ± 2 ppm  ± 0.5 ppm  ± 0.2 vol.-%  ±2 ppm
Sensitivity: [% of measured value]  ± 2  ± 2  ± 1  ±2
Drift (20
o
C)
Zero point:  ± 2 ppm/a  ± 1 ppm/a  ± 0.5 vol.-%/a  ±2 ppm/a
Sensitivity: [% of meas. value/month ]  ± 1  ± 1  ± 1  ±1
Response times t
0...50
/t
0...90
7/11 seconds 7/13 seconds 12/20 seconds 12/22 seconds
Zero error (EN45544) 6 ppm 2 ppm – – – 1 ppm
Capture range
5)
± 6 ppm ± 2 ppm – – – ± 1 ppm
Cross-sensitivities
6)
exist
7)
exist
8)
exist
9)
exist
7)
Standards, performance tests for toxic
gases and oxygen deficiency and
enrichment Type Certificate PFG 07 G 003
EN 45544
EN 50271
EN 45544
EN 50271
EN 50104
EN 50271
EN 45544
EN 50271
Sensor Order Number
3)
6810882 6810883 6810881 68 13 210
Sensor Data Sheet Order Number 9023816 9023819 9023820 90 33 454
Cross sensitivity
factors
4)
CO
CO LC
H
2
S O
2
Acetylene  2 negligible  –0.5
Ammonia negligible negligible negligible
Carbon dioxide negligible negligible  –0.04
Carbon monoxide negligible negligible  0.2
Clorine  0.05  –0.2 negligible
Ethane no value no value  –0.2
Ethanol negligible negligible negligible
Ethene no value no value  –1
Hydrogen  0.35 negligible  –1.5
Hydrogen chloride negligible negligible negligible
Hydrogen cyanide negligible negligible negligible
Hydrogen sulphide  0.03 negligible
Methane negligible negligible negligible
Nitrogen dioxide  0.05  –0.25 negligible
Nitrogen monoxide  0.2  0.03 negligible
Propane negligible negligible negligible
Sulphur dioxide  0.04  0.1 negligible