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5.7 Oxygen Sensor
Type
Range
Resolution
Repeatability
(within 30 minutes)
Accuracy
T90 Response Time
Cross Gas Effects
Pressure Compensation
Anticipated Life
Calibration
5.8 Carbon Monoxide Sensor
Type
Range
Resolution
Repeatability
(within 30 minutes)
Accuracy
T90 Response Time
Cross Gas Effects
Drift
Pressure Compensation
Anticipated Life
Maximum Overload
Humidity Range
Calibration
5.9 VOC Detector
Type
Range
Resolution
Repeatability
(within 30 minutes)
Accuracy
T90 Response Time
Lifetime
Substances detected
5.10 Pressure
Type
5.11 Pump
Type
Flow
Vacuum
Page 12
Acid electrolyte
Range 0-21% calibrated. Will read up to 100%
0.1%
±2% of reading or ±0.2% – whichever is greater
±4% of reading or ±1% by volume – whichever is greater, over measurement and
temperature ranges within 8 hrs of calibration
Approx. 40 seconds
Unaffected by CO2 or CO
Pressure compensated by separate pressure transducer
900,000 % Hours (5 years @ 21%)
User zero/span re-calibration facility
Electrochemical cell
0-50ppm
1ppm
±5% of reading or ±1ppm – whichever is greater
±20% of reading or ±3ppm – whichever is greater over
temperature ranges within 8 hrs of calibration
<20 seconds
Unaffected by CO2
<5% signal loss / year
Diffusion sensor – atmospheric ±10%
Two years in air
1,500ppm
10% - 90% non condensing
User zero/span re-calibration facility
Photoionisation detector
0 – 20ppm isobutylene equivalent
1ppm
±5% of reading or ±0.5ppm – whichever is greater
±20% of reading or ±2ppm – whichever is greater over measurement and
temperature ranges within 8 hrs of calibration
<40 seconds
6000 Hours operation, cleaning may be required before this time, depending on
sample gas.
Any VOC with ionisation potential <10.6 eV
Silicon bridge transducer
Absolute pressure type (barometric pressure measurement)
DC motor, diaphragm
Average 350cc/minute
Maximum – 400mbar
Geotechnical Instruments
measurement and
CODAOM002 Iss.06
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