DMG100 User’s Guide
3
LCD Display
Item
Function
A
Main Numeric Display
B
Alternate Numeric Display
C
“Analog” Vacuum Level Bar Graph
Backlight Indicator. Flashing: Temporary, Solid: Always On
Sound Indicator
Battery Level Indicator
Oil Sensor Indicator
Calibration Mode Indicator
Indicates that Temperature is Displayed on the Alternate Numeric Display (during
calibration)
Indicates degrees Celsius on the Alternate Numeric Display (during calibration)
Pascal Units Indicator
Millibar Units Indicator
Millitorr Units Indicator
Millimeters of Mercury Units Indicator
Micron Units Indicator
DMG100 User’s Guide
8
Calibration Test
The DMG100 should rarely require recalibration, though it may be necessary to know that your gauge
is calibrated properly for full accuracy. The Calibration Test mode assures you that the DMG100 is
calibrated to factory specifications. Test the calibration as follows:
1.
Turn the DMG100 power off.
2.
Important:
Expose the DMG100 to atmospheric pressure.
3.
Press and hold (do not release) the
key for about 5 seconds.
4.
The display will show
if the instrument is calibrated properly.
5.
The display will show
if the instrument requires calibration. Please see the
Calibration section below.
Calibration
If the Calibration Test indicates recalibration is required, the gauge may be recalibrated. Unlike any
other vacuum gauge, the DMG100 can be easily recalibrated to factory specifications without any
special equipment, with the following procedure:
1.
For best results, clean the sensor with alcohol prior to calibration. Ensure the sensor is
completely dry before proceeding.
2.
Turn the DMG100 power off. If necessary, install a fully charged battery into the gauge.
3.
Place the dust cap over the vacuum fitting.
4.
Hold
while pressing
. As soon as the power turns on, release
and
and then
press
quickly at least three times. The
CAL
indicator should illuminate, and
should show on the Main Numeric Display. If not, turn the power off again and repeat.
5.
Place the DMG100 in a clear Ziploc (resealable zipper storage) bag, press out any extra air, and
seal.
6.
Place the bagged DMG100 into a freezer with a temperature of less than –5
°
C (23
°
F).
7.
Allow the DMG100 to cool to below -2
°
C (28.4
°
F). At this point, the alarm will sound and the
display will change to
.
8.
Remove from freezer and press any key to silence the alarm.
9.
Place the DMG100 undisturbed in an area with a room temperature of at least 23
°
C (73.4
°
F) but
no greater than 30
°
C (86
°
F).
10. Allow the DMG100 to warm to 20
°
C (68
°
F). At this point, the alarm will sound, and
will show on the display.
11. Press any key to silence the alarm. The DMG100 is now calibrated to factory specifications.
Note:
For accurate calibration, it is necessary to allow the DMG100 to warm slowly. Attempting to
accelerate the warming by using a heat source will not provide satisfactory results. During the
cooling/warming process, the temperature will be indicated on the Alternate Numeric Display in
degrees Celsius. The calibration process may be canceled at any time by turning off the DMG100.
The previous calibration will be unchanged.
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