UEi Test Instruments DMG200 - Manual (Page 5)

DMG200 User’s Guide
8
Programming
The programming feature of the DMG200 allows for unattended evacuation of large systems, and will
sound an audible/visual alarm when the evacuation program has been completed. The program
consists of both a target pressure (vacuum level) and a time period through which the system must
remain at or below that pressure. There are 16 possible target pressures, depending upon the units
displayed, as shown in the table below:
Units
Microns Pascal Millibar Millitorr mmHg
50 5.0 0.050 50 0.050
75 10.0 0.100 75 0.075
100 15.0 0.150 100 0.100
150 20.0 0.200 150 0.150
200 30.0 0.300 200 0.200
300 50.0 0.500 300 0.300
500 75.0 0.750 500 0.500
750 100.0 1.000 750 0.750
1000 150.0 1.500 1000 1.000
1500 200.0 2.000 1500 1.500
2000 300.0 3.000 2000 2.000
3000 500.0 5.000 3000 3.000
5000 750.0 7.500 5000 5.000
7500 1000.0 10.000 7500 7.500
10000 1500.0 15.000 10000 10.000
15000 2000.0 20.000 15000 15.000
The evacuation time period may be programmed between 0 seconds and 100 minutes. To program
the DMG200:
Programming (Set Mode)
1.
Turn the power on by pressing .
2. Select the desired units by repeatedly pressing .
3. Activate the Program Set Mode by pressing and holding . The indicator will show on the
display, as well as the currently programmed target pressure and time.
4. While the pressure display is flashing, press and/or hold the or keys to increase or
decrease the target pressure. When compete, press and release the key.
5. While the minutes display is flashing, press and/or hold the or keys to increase or decrease
the minutes. When compete, press and release the key.
6. While the seconds display is flashing, press and/or hold the or keys to increase or
decrease the seconds. When compete, press and release the key. The gauge will beep
three times (if sound is enabled), and return to normal mode.
7. At any point in the Program Set Mode, pressing and holding the key will result in saving the
current program and returning to normal mode.
8. Once programmed, the DMG200 will remember the settings until changed again, even if the
power is turned off or the battery removed.
Note: The units cannot be changed while in the Set Mode.
DMG200 User’s Guide
5
Battery Installation & Replacement
1. Remove the battery cover from the rear of the DMG200 by compressing tab at the base of the
battery cover.
2. If necessary, remove and detach old battery from battery clip.
3. Attach battery clip to new battery and insert into battery compartment. Replace battery cover by
aligning tab and snapping back into place.
IMPORTANT: TO PREVENT DAMAGE FROM LEAKING BATTERIES, DO NOT LEAVE A DEAD
BATTERY INSIDE THE DMG200. REMOVE BATTERY IF THE DMG200 IS NOT TO BE USED FOR
AN EXTENDED PERIOD OF TIME.
Battery Level Indicator
The battery level indicator shows the relative strength of the battery. Full power is indicated by four
bars. 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 DMG200 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
DMG200 is turned back on, the DMG200 will resume operation with all previous setting 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 DMG200 helps to conserve battery life through advanced
power management. After 5 minutes of displaying
, the DMG200 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 DMG200 will not sleep in the Set Mode (see pg. 8) or the Calibration
Mode (see pg. 10).
Auto Power-Off
After 1 hour in “Sleep Mode” the DMG200 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 DMG200 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