Heath Consultants Remote Methane Leak Detector (RML) - Manual (Page 18)

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i. Press Up button to turn on or to turn off the display backlight.
Fig. 3-5
Although the ppm-m readout will not be updating, the instrument will still operate
properly while in a menu option other than the run display.
Using the DMD Mode
The Digital Methane Detection (DMD) mode is a highly sophisticated detection algorithm
that greatly enhances the use of the RMLD. In most situations, the operator should survey
with the DMD mode turned on. To turn on the DMD mode, press the DMD button (the
DMD icon will appear on the display). This mode can only be activated while in the main
survey screen.
DMD icon is on
Fig. 3-6: DMD icon is displayed when in DMD mode.
While using the DMD, no sound will be heard until a detection of methane occurs. The
pitch of the sound will be relative to the methane concentration. The higher the pitch, the
stronger the methane concentration is.
A low-pulsating or continuous sound will indicate a warning due to an infrared laser low
light level condition or instrument fault. The warning icon will also be displayed
indicating that the light level is too low (See Long Range Scanning Pg. 23). The operator
needs to move in closer to get in range.
Should the warning persist, it could be due to a fault in the instrument. Check the error
code being displayed and follow the instructions in the troubleshooting guideline.
The DMD will indicate detection when the ppm-m exceeds the average background plus
Alarm Detection Threshold level, or when the reading is excessive. While the low light
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101515-0 RMLD MANUAL REV E