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Q.E.D. ENVIRONMENTAL SYSTEMS LIMITED -
Cyan Park - Unit 3, Jimmy Hill Way, Coventry. CV2 4QP.
UNITED KINGDOM
Tel: +44 (0)333 800 0088
E-Mail:
Web:
www.qedenv.com
REGISTERED IN ENGLAND AND WALES NO. 1898734
OMLASERONE Iss. 01
7
SETTINGS
Measurement Range
Methane measurement
The LASER ONE measurement will be displayed on the main screen
The LASER ONE measurement is selective to Methane only and will not suffer from any cross-gas
contamination from other gases due to the Laser Diode technology used.
The dual range will display the measured Methane from 0-1% in ppmVol (0- 10,000ppm) and above
1% will automatically switch to display the measurement in %Vol up to the full-scale of 100%.
Measure in absolute mode (ABS) and relative mode (REL)
The ‘Absolute’ measurement (ABS), is the measurement of the ambient concentrations which will
include the background level of Methane present in the atmosphere, this is typically between 1.0
and 3.0 ppm.
It may be desirable for the user to remove this background level of Methane during the
measurement survey. The ‘Relative’ measurement (REL) allows for the user to see more easily a
change in the environmental concentration, it may also make a transient leak of gas more visible to
the user as it would act as a contrast between the ambient concentration and the magnitude of the
leak.
When the instrument is in ‘Relative’ (REL) mode, if the detected measurement exceeds a pre-defined
value of 5ppm, the instrument will automatically switch to ‘Absolute’ (ABS) mode. When the
measurement returns to a lower value (i.e. <5ppm), the instrument will automatically switch back to
‘relative’ (REL) mode.
Note:
The configuration or settings of the instrument when it is turned off will be remembered
and returned to automatically when next used.
ABS
MODE
REL
MODE
Summary of Contents for Laser One
Page 1: ...OPERATING MANUAL...