Iq force™ Gas Detector Reference Manual

Verification of Accuracy & Related Terminology

Download 339.9 Kb.
View original pdf
Size339.9 Kb.
1   ...   79   80   81   82   83   84   85   86   87
Verification of Accuracy & Related Terminology
With so many reasons why a sensor can lose sensitivity and given the fact that dependable sensors are critical to survival in a hazardous environment, frequent verification of sensor performance is paramount.
There is only one sure way to verify that a sensor can respond to the gas for which it is designed. That is to expose it to a known concentration of target gas and compare the reading with the concentration of the gas to ensure that it is within a manufacturer’s recommended tolerable limits. This is referred to as a calibration check or bump test. This testis very simple and takes only a few seconds to accomplish. The safest course of action is to do a calibration check or bump test prior to each day’s use.
The Canadian Standards Association (CSA) requires the instrument to undergo calibration when the displayed LEL value during a bump test fails to fall between 100% and 120% of the expected value for the gas.
It is not necessary to perform a full calibration (adjustment) unless readings for LEL and toxic gases/vapors are outside of the range of 90% to 120% of the expected value. For oxygen, the acceptable range is considered to be
±0.5% vol, so 20.4% to 21.4% O in ambient clean air or via application of zero air. Further for oxygen, for application of Honeywell Analytics 18.0% O balance gases, the reading should again be within ±0.5% vol, so 17.5% to 18.5% O2.

Iq force™ gas detector
Contacting honeywell analytics
Technical services
Appendix a toxic gas measurement – warning, danger, stel,
Appendix d toxic sensor cross-sensitivity .............................. 52
Operating temperature
Multi-sensor capability
Table 2. alarm logic
Iq force portable gas detectors have been designed for the
In the event of an lel over-range alarm, the iq force must be
A sensor that cannot be calibrated or is found to be out of toler-
Do not use the pump for prolonged periods in an atmosphere
Case: the instrument is enclosed in a solid pc (polycarbonate) case with tpe (rubber) overmold.2. front face:
On/off mode button:
Battery charger connector:
Turning the iq force on
Notethe bump test interval and bump test due reminder are
Notesample probe assembly and tubing must be attached when
Always verify that all sensors present in the instrument are
Turning the iq force off
The iq force is designed to detect potentially life threatening
The iq force must be located in a nonhazardous location during
A combustible sensor over-range alarm indicates a potentially
Pc connection via infrared port
Error messages
Manual sample-draw kit
Motorized sample-draw pump
The canadian standards association (csa) requires the lel
Calibration/accuracy verification
Figure 1. bump test/span calibration setup
Fresh air/zero calibration
Possible causes and solutions
Fresh air/zero calibrations may only be performed in an
Span calibration
Noteonce the calibration cycle is completed, the iq force will
Possible causes of span calibration failure and remedies:
A sensor that cannot be calibrated or is found to be out of
Noteto enable the h
Notehoneywell analytics recommends regular verification of
Notethe bump test interval and bump test reminder are used
Toxic gas measurement – warning, danger, stel, and twa alarms
A.2 time weighted average (twa)
Appendix b calibration frequency rec-
Lengthening the intervals between calibration checks or bump tests
One button automatic full calibration and calibration docks
Iq force sensor information

Share with your friends:
1   ...   79   80   81   82   83   84   85   86   87

The database is protected by copyright © 2017
send message

    Main page

Harley Davidson