UEi Test Instruments DMG200 - Manual (Page 4)

DMG200 User’s Guide
4
Keypad
Quick Start
To operate the DMG200 as a basic vacuum gauge:
1.
Install the battery as described in the “Battery Installation” section (see pg. 5).
2. Turn the power on by pressing . The display will show to indicate pressure greater
than 25,000 Microns.
3. Select the desired units by repeatedly pressing .
4. Attach the DMG200 to the system to be evacuated with a high quality vacuum hose. Start the
vacuum pump. Read the vacuum level from the Main Display.
5. Turn the power off by pressing and holding .
Item Function
Press to Turn Power On, Press and Hold to Turn Power Off
Press and Release to Change Display Units
Press and Hold to Change Temperature Display Units (°F or °C)
Press and Release to Enter RUN Mode
Press and Hold to Cancel RUN Mode
Press to Switch Between Temperature Display and Leak Rate Display
Press and Release to Activate Backlight
Press or Press and Hold to Change Programmed Pressure or Time in SET mode
Press and Hold to Enter SET Mode
Press and Release to Switch to Next Setting
Press and Hold to Exit SET Mode
Press and Hold to Mute/Un-mute Sound
DMG200 User’s Guide
9
Executing the Program (Run Mode)
1. Press and release . The RUN and TIME indicators will illuminate on the display.
2. Start the vacuum pump.
3. When the vacuum pressure drops to less than the target pressure, the timer will start.
Subsequently, if the pressure exceeds the target pressure, the timer will stop and resume
counting when the pressure again drops to less than the target pressure.
4. When the timer expires, the DMG200 will sound an alarm, flash the backlight, and blink the
DONE indicator. Press any key to silence the alarm. The program is complete.
5. At any time during the Run Mode, the program can be canceled by pressing and holding .
6. While in the Run Mode, the gauge may sleep after 5 minutes of high pressure. The gauge will
wake and continue the program normally once the pressure drops below 25,000 Microns. The
gauge may be manually wakened from sleep by pressing any key. In the Run Mode, the Auto
Power-Off feature is disabled.
Note: The units cannot be changed while in the Run Mode. Also, the Leak Rate and Ambient
Temperature Indicators are disabled.
Maintenance
The DMG200 should provide many years of service with no maintenance required. When not in use,
the dust cap should remain in place over the sensor port. Clean the plastic enclosure with a damp
(not wet) rag. Mild detergent is acceptable, but use no solvents. Take care not to expose the
vacuum sensor to oil. If the Oil Sensor (described above) indicates a contaminated sensor, follow the
Sensor Cleaning Procedure below.
Cleaning the Vacuum Sensor
If the vacuum sensor becomes contaminated with oil (as indicated by the Oil Sensor), carefully follow
this procedure:
1. Turn the DMG200 power off.
2. Shake the gauge to remove any large quantities of oil from the sensor.
3. Apply a few drops of rubbing alcohol inside the sensor vacuum port. ( DO NOT INSERT ANY
OBJECT INTO THE PORT, AS THIS WILL PERMANENTLY DAMAGE THE SENSOR).
4. Place your finger over the port and shake for a few moments.
5. Remove your finger and shake out the alcohol.
6. Repeat steps (3) – (5) at least three times.
7. Allow the sensor to air dry over at least an hour, or pull a vacuum on the sensor to dry it more
quickly.
8. Replace the battery and turn on the gauge. The Oil Indicator should be off. If it is still on, repeat
the cleaning procedure.
9. If full accuracy is desired, perform a calibration cycle as detailed in the Calibration section below.
Note: It is important to remove all alcohol vapors from the sensor, either through air-drying or via
vacuum. Any remaining vapors will cause an incorrect vacuum reading.