Heath Consultants Remote Methane Leak Detector Intrinsically Safe (RMLD-I) - Manual (Page 35)

Glossary
Beam Skip: Occurs when the IR beam jumps between a near object and a far away
object. This may cause a false detection.
Control Module: The portion of the RMLD-IS with the keypad and display that clips
onto a harness.
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, increasing with distance. At 100
ft., this area is 22” in diameter when shined against a vertical wall.
Infrared (IR): A wavelength of light just outside the range of the visible spectrum.
Laser Calibration Drift: A normal characteristic of tunable diode lasers is that the
wavelength calibration can drift slowly overtime. The RMLD-IS 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
width of the plume.
Pure Tones: A mode that will emit a continuous tone relative to the concentration of gas
detected.
Spotter Laser: The green, blinking laser attached to the top of the transceiver which
guides the operator as to the location of the IR beam. This laser can be activated through
the trigger located on the transceiver grip.
Transceiver: The hand-held portion of the RMLD-IS, which contains the invisible IR
laser transmitter/receiver and green spotter laser.
Tunable Diode Laser Absorption Spectroscopy: A method of gas detection that utilizes
a laser that, when shined through a cloud of methane, will be partially absorbed by the
gas which can be measured for gas concentration.
101296-0 RMLD IS MANUAL REV J
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