Doc No. 105408 Rev C, RMLD-CS Operator Manual
RMLD-CS
Operator’s Manual
Manual
© 2021 Heath Consultants Incorporated. All rights
reserved.
32
Audio Modes
DMD (Digital Methane Detection)
The Digital Methane Detection (DMD) mode is a highly sophisticated detection algorithm that greatly
enhances the use of the RMLD-CS. In most situations, the operator should survey with the DMD mode
turned on. To turn on the DMD mode, press the MENU button, select AUDIO MODE, then select DMD.
While using the DMD, no gas detection sound will be heard and the display will not respond until a
detection of methane above the alarm level occurs. When methane is detected, the audible alarm will
sound and the display readings / bar graph will change color to red.
DMD detection is possible when the PPM-M reading is high and there is a low light warning. While the low
signal warning is sounding, the RMLD-CS may still be able to detect high gas concentrations.
The Alarm Level controls the response of the DMD. The operator can adjust the Alarm Level. Your
company’s survey procedure may require the use of a specific value
or procedure to set it. Set the Alarm
Level such that the false detection rate is low, while not too high that leaks are missed.
Real Time (Geiger)
The Real Time mode of the RMLD-CS emits a continuous yet variable beep rate that is relative to the
concentration reading. The faster the instrument beeps, the higher the methane concentration level. Note
that the beep frequency increases as you scan at a further distance due to the ambient amount of methane
in the air. The usable concentration range used by Real Time is 10
–
1000 PPMM. Real Time is very
convenient to use for leak spread and leak centering.
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