RMLD-CS
Operator’s
Manual
Doc No. 105408 Rev C, RMLD-CS Operator Manual
© 2021 Heath Consultants Incorporated. All rights
reserved.
8
Definitions
Beam Skip:
Occurs when the IR beam jumps between a near object and a far object. This may cause a false
detection. This can also occur on highly reflective surfaces (windows, water, ice, etc.).
Dark Zone:
An area not being scanned due to an obstruction. This may be an elevation change, the side of a
building, behind a curb, etc.
DMD (Digital Methane Detection):
An advanced detection mode which, when activated, will only
alert the operator when there is a probable detection of methane.
Footprint:
The surface area covered by the IR beam, which increases with distance. At 100 ft., this area is
22” in diameter
when shined against a vertical background.
Infrared (IR):
Optical radiation with wavelengths longer than those of the visible spectrum.
Laser Calibration Drift:
A normal characteristic of tunable diode lasers is that the wavelength calibration
can drift slowly over time. The RMLD-CS has a built in Self-Test/Calibration feature to automatically
maintain proper calibration.
PPM-M (Parts Per Million Meter):
The product of the methane concentration times the thickness of the
plume.
Real Time:
An audible mode that will continuously emit a variable beep rate relative to the concentration
of gas. The response range covers 10
–
1000 PPMM.
Spotter Laser:
The green, blinking laser which guides the operator as to the location of the IR beam. This
laser can be activated through the left button located on the keypad.
Tunable Diode Laser Absorption Spectroscopy:
A method of gas detection that utilizes a laser that,
when directed through a cloud of methane, will be partially absorbed by the gas and the return
signal can then be analyzed for gas concentration.
Summary of Contents for HPN105354
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