User guide

DMG200 User’s Guide
6
display. Prior to further use of the DMG200, clean the sensor as describe in the “Cleaning the
Vacuum Sensor” on pg. 9.
Units
Change the displayed units by pressing and releasing 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. The units cannot be changed in the Set Mode (see pg. 8) or the Run Mode (see pg. 9).
Range and Resolution
The DMG200 has a broad vacuum pressure measurement range, and the highest resolution of any
gauge. The display range and resolution depends upon the units displayed and the vacuum pressure
reading, according to the table below:
Vacuum
Range
Vacuum Pressure
Reading Resolution
1,000.0 — 3,333.1 0.1 Pa
Pascals (Pa)
0
— 3,333.1
0
— 999.99 0.01 Pa
10.000 — 33.331 0.001 mBar
Millibar (mBar)
0
— 33.331
0
— 9.9999 0.0001 mBar
10,000 — 25,000 1 mTorr
Millitorr (mTorr)
0
— 25,000
0
— 9,999.9 0.1 mTorr
10.000 — 25.000 0.001 mmHg
mmHg (mmHg)
0
— 25.000
0
— 9.9999 0.0001 mmHg
10,000 — 25,000 1 Micron
Microns (Microns)
0
— 25,000
0
— 9,999.9 0.1 Micron
“Analog” Vacuum Level Bar Graph
The DMG200 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
DMG200 User’s Guide
7
Backlight
To activate the Backlight temporarily, press once. The
indicator on the display will flash, and
the backlight will turn off automatically after 1 minute. To activate the Backlight permanently, press
again. The indicator on the display will show solid. Turn off the backlight by pressing
repeatedly until the indicator turns off. During Sleep Mode, the backlight will turn off to help
conserve battery power, but will turn on again automatically upon resumption of normal operation if it
was
previously set in the permanent-on mode.
Sound
The DMG200 has an internal speaker that will emit a beep for each valid key press, and also
functions as an alarm in the Programming (see pg. 8) and Calibration modes (see pg. 10). It will also
beep every 5 minutes in Sleep Mode. For silent operation, the sound can be muted by pressing and
holding the key. The alarm is not affected by the mute status. The indicator on the LCD display
indicates that the sound is on (not muted).
Alternate Numeric Display
The DMG200 has an Alternate Numeric Display that can indicate Vacuum Leak Rate, Ambient
Temperature, or Programming Time/Progress. Please refer to the “Programming” section (see pg. 8)
for programming instructions. During normal operation, the Alternate Numeric Display may show
either Vacuum Leak Rate or Sensor Temperature. Select the display mode by pressing the key
until either LEAK RATE or TEMP illuminates on the display.
Vacuum Leak Rate Indicator
The Vacuum Leak Rate Indicator displays the rate of change of vacuum per second in the selected
units when the LEAK RATE
indicator is illuminated. The reading is positive for increasing pressure and
negative of decreasing pressure. The Leak Rate Indicator is useful for determining the size of a
vacuum leak, if one exists. Under high-pressure conditions, the leak rate indicator shows .
Ambient Temperature Indicator
Internally, the DMG200 uses a very high accuracy temperature sensor to maintain proper calibration
throughout the entire operating temperature range. This temperature is shown on the Alternate
Numeric Display when the TEMP indicator is illuminated. The accuracy of the temperature sensor is
0.2°F or 0.1°C. The temperature display units can be toggled between Fahrenheit and Celsius by
pressing and holding the key while in the temperature display mode.
Swivel Hook
The DMG200’s removable stainless steel swivel hook enables hanging of the gauge and will allow it
to swivel freely in any direction. The gauge may be operated with or without the hook attached.
When fastening the hook to the gauge, turn it finger tight only. Use of a tool to tighten the hook may
result in damage to the DMG200 case.