new sensors and may vary after aging or poisoning.Unless otherwise stated, they refer to an ambient temperature of 20
°C. If using a reference gas to calibrate the gas detector the displayed values may vary by up to ±20% from the target
gas concentration.
Customers using the catalytic combustible gas sensors to detect hydrogen and hydrocarbons in an environment that
may contain polar solvents must:
• Calibrate their sensors with the target gas. Do not use a surrogate gas for calibration.
• After exposure to polar solvents, the sensor must be recalibrated using the target gas, independent of the
calibration interval, and a gas/ function check shall be performed 24 hours after calibration to verify sensor
response and accuracy.
Reference calibration example for 50% Acetone:
1. Relative response factor for Acetone from table in
Section 5.3.2 .
= 0.94
2. Propane calibration gas concentration being used = 0.89 vol% C
3
H
8
3. Propane volume concentration for 100% LEL = 1.7 vol%
4. Propane calibration gas concentration in % LEL
= 52.4% LEL
5. Gas detector span setting = 52.4% LEL x 0.94 = 49.3% LEL
5.3.1 47K-HT-PRP
Relative response factors of tested gases with reference to Propane.
These values are only valid for new sensors and may vary after aging or poisoning. Unless otherwise stated, refer to an
ambient temperature of 110 °C. In this case the displayed values may vary by up to ±20% from the target gas
concentration.
Sample Gas 100% LEL in
vol%
Propane relative
response factor
Response time
[secs] t
50
*)
Response time
[secs] t
90
*)]
Methane(pending) 4.4 0.52 < 8 < 14
*) Response times are with a flow through adapter and a gas flow of 1 l/min
5.3.2 47K-PRP
Relative response factors of tested gases with reference to Propane.
These values are only valid for new sensors and may vary after aging or poisoning. Unless otherwise stated, refer to an
ambient temperature of 20 °C. The response factors can have a deviation up to 20%. Response times stated in the
enclosed table may vary by ±20% depending on the tolerances of individual sensors.
Sample Gas 100% LEL in
vol%
Propane relative
response factor
Response time
[secs] t
50
*)
Response time
[secs] t
90
*)]
Acetone 2,5 0.94 < 14 < 27
2-Butanone 1,5 1.30 < 16 < 41
GB Series 47K 16
5 Maintenance and Service
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