DMG100 User’s Guide
5
Battery Level Indicator
The battery level indicator shows the relative strength of the battery. Four bars indicate full power.
As the battery is depleted, the number of bars displayed decreases, until no bars are left. At this
point, it is necessary to replace the batteries (refer to the Battery Installation section above). If the
battery power drops to the point where the DMG100 can no longer function accurately, the alarm will
beep 10 times and the power will turn off automatically. When the battery is replaced, and the
DMG100 is turned back on, the DMG100 will resume operation with all previous settings intact.
Hi-Pressure Indication
If the sensed vacuum pressure exceeds 25,000 Microns (3333.1 Pa, 33.331 mBar, 25,000 mTorr, or
25.000 mmHg), the display will show
.
Sleep Mode
Unlike other Digital Micron Gauges, the DMG100 helps to conserve battery life through advanced
power management. After 5 minutes of displaying
, the DMG100 will enter “Sleep Mode” in
which the sensor and backlight are turned off, thus reducing the load on the battery and extending the
battery life up to 300 hours or more. While in this mode, the display will show
.
Approximately every 35 seconds, the gauge will automatically check the pressure and exit Sleep
Mode if the pressure is less than 25,000 Microns. The gauge can be manually brought out of Sleep
Mode by pressing any key on the keypad. While in Sleep, the gauge will beep twice every 5 minutes
to remind you that it is on. The DMG100 will not sleep in the Calibration Mode (see the Calibration
section on pg. 8).
Auto Power-Off
After 1 hour in “Sleep Mode” the DMG100 will automatically turn itself off to further conserve battery
power.
Oil Sensor
It is necessary to prevent oil from being drawn into the Vacuum Sensor. For HVAC/R service, always
recover refrigerant prior to attaching gauge. If possible, always close the blank-off valve on the
vacuum pump prior to turning the vacuum pump off. Over time, oil vapor and other materials may
contaminate the sensor. The DMG100 has a built in Oil Sensor that will detect this condition. If the
OIL
indicator on the display illuminates, this is an indication that the vacuum sensor has been
contaminated and is no longer functioning accurately. If the sensor becomes completely saturated
with oil to the extent that it cannot function properly at all, the message
will show on the
display. Prior to further use of the DMG100, clean the sensor as describe in the “Cleaning the
Vacuum Sensor” on pg. 7.
Units
Change the displayed units by pressing the
key on the keypad. The appropriate units indicator
on the LCD display will show
Pa
,
mBar
,
mTorr
,
mmHg
, or
Microns
depending on the units set.
DMG100 User’s Guide
6
Range and Resolution
The DMG100 has a broad vacuum pressure measurement range and very high resolution according
to the table below:
Vacuum
Range
Resolution
Pascals (Pa)
0
—
3,333.1
0.1 Pa
Millibar (mBar)
0
—
33.331
0.001 mBar
Millitorr (mTorr)
0
—
25,000
1 mTorr
mmHg (mmHg)
0
—
25.000
0.001 mmHg
Microns (Microns)
0
—
25,000
1 Micron
“Analog” Vacuum Level Bar Graph
The DMG100 also displays a Vacuum Level Bar Graph allowing for a quick visual determination of
the vacuum level achieved. Each bar corresponds to a vacuum pressure range depending on units
according to the following table:
Units
Bar
Value
Microns
Pa
Millibar
Millitorr
mmHg
10K
10,000 — ATM
1,000 — ATM
10 — ATM
10,000 — ATM
10 — ATM
5K
5,000 — 10,000
500 — 1,000
5 — 10
5,000 — 10,000
5 — 10
2K
2,000 — 5,000
200 — 500
2 — 5
2,000 — 5,000
2 — 5
1K
1,000 — 2,000
100 — 200
1 — 2
1,000 — 2,000
1 — 2
500
500 — 1,000
50 — 100
0.5 — 1
500 — 1,000
0.5 — 1
200
200 — 500
20 — 50
0.2 — 0.5
200 — 500
0.2 — 0.5
100
100 — 200
10 — 20
0.1 — 0.2
100 — 200
0.1 — 0.2
50
50 — 100
5 — 10
0.05 — 0.1
50 — 100
0.05 — 0.1
20
20 — 50
2 — 5
0.02 — 0.05
20 — 50
0.02 — 0.05
10
10 — 20
1 — 2
0.01 — 0.02
10 — 20
0.01 — 0.02
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