Iq force™ Gas Detector Reference Manual

A.2 Time Weighted Average (TWA)

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A.2 Time Weighted Average (TWA)
The maximum average concentration to which an unprotected worker maybe exposed over an eight hour working day is called the Time Weighted Average or TWA value. TWA values are calculated by taking the sum of exposure to a particular toxic gas in the current operating session in terms of parts-per-million-hours and dividing by an eight-hour period.

Toxic Gas Measurement – Warning, Danger, STEL, and TWA alarms
IQ Force™ Gas Detector Reference Manual Appendix
A.3 Short Term Exposure Limits
Toxic substances may have short term exposure limits which are higher than the eight hour TWA. The STEL is the maximum average concentration to which an unprotected worker maybe exposed in any fifteen minute interval during the day. During this time, neither the eight hour TWA nor the ceiling concentration maybe exceeded. Any fifteen minute periods in which the average STEL concentration exceeds the permissible eight hour TWA must be separated from each other by at least one hour. A maximum of four of these periods are allowed per eight hour shift.


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
Appendix b calibration frequency rec-
Verification of accuracy & related terminology
Lengthening the intervals between calibration checks or bump tests
One button automatic full calibration and calibration docks
Iq force sensor information

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