UEi Test Instruments DMG100 User manual

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DMG100

Digital

Micron

Gauge

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Parts Diagram

DMG100 User’s Guide

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DMG100 User’s Guide

Calibration Test

The DMG100 should rarely require recalibration, though it may be necessary to know that y

our 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.

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.

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

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Keypad

to indicate pressure greater

BATTERY INSIDE THE DMG100. REMOVE BATTERY IF THE DMG100 IS NOT TO BE USED FOR

Item Function

Press to Turn Power On, Press and Hold to Turn Power Off

Press to Change Display Units

Press and Release to Activate Backlight

Press and Hold to Mute/Un-mute Sound

Quick Start

DMG100 User’s Guide

To operate the DMG100 as a basic vacuum gauge:

1. Install the battery as described in the “Battery Installation” section below.

2. Turn the power on by pressing than 25,000 Microns.

3. Select the desired units by repeatedly pressing

4. Attach the DMG100 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

. The display will show

Battery Installation & Replacement

1. Remove the battery cover from the rear of the DMG100 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

AN EXTENDED PERIOD OF TIME.

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DMG100 User’s Guide

As the battery is depleted, the number of bars displayed decreases, until no bars are left. At this

which the sensor and ba

Approximately every 35 seconds, the gauge will automatically check the pressure and exit Slee

After 1 hour in “Sleep Mode” the DMG100 will automatically turn itself off to further conserve battery

with oil to the extent that it cannot function properly at all, the message

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)

— 3,333.1 0.1 Pa

Millibar (mBar)

— 33.331 0.001 mBar

Millitorr (mTorr)

— 25,000 1 mTorr

mmHg (mmHg)

— 25.000 0.001 mmHg

Microns (Microns)

— 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

Battery Level Indicator

The battery level indicator shows the relative strength of the battery. Four bars indicate full power.

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

cklight 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

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).

, the DMG100 will enter “Sleep Mode” in

Auto Power-Off

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

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.

will show on the

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DMG100 User’s Guide

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)

— 3,333.1 0.1 Pa

Millibar (mBar)

Millitorr (mTorr)

mmHg (mmHg)

Microns (Microns)

— 33.331 0.001 mBar

— 25,000 1 mTorr

— 25.000 0.001 mmHg

— 25,000 1 Micron

“Analog” Vacuum Level Bar Graph

Bar

Value

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

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

Microns Pa Millibar Millitorr mmHg

Units

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DMG100 User’s Guide

was previously set in the permanent

Keypad

Quick Start

To operate the DMG100 as a basic vacuum gauge:

1. Install the battery as described in the “Battery Installation” section below.

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 DMG100 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 .

Battery Installation & Replacement

1. Remove the battery cover from the rear of the DMG100 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 DMG100. REMOVE BATTERY IF THE DMG100 IS NOT TO BE USED FOR

AN EXTENDED PERIOD OF TIME.

Item Function

Press to Turn Power On, Press and Hold to Turn Power Off

Press to Change Display Units

Press and Release to Activate Backlight

Press and Hold to Mute/Un-mute Sound

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

-on mode.

Sound

The DMG100 has an internal speaker that will emit a beep for each valid key press, and also functions as an alarm in the Calibration mode (see the Calibration section on pg. 8). It will also beep every 5 minutes in Sleep Mode. For silent operation, the sound can be muted by pressing and holding the the LCD display indicates that the sound is on (not muted).

key. The Calibration mode alarm is not affected by the mute status. The indicator on

Swivel Hook

The DMG100’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 DMG100 case.

Maintenance

The DMG100 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 (see pg. 5) 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 DMG100 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 (see pg. 8)..

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.

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DMG100 User’s Guide

our gauge

Place the DMG100 in a clear Ziploc (resealable zipper storage) bag, press out any extra air, and

F) but

Calibration Test

The DMG100 should rarely require recalibration, though it may be necessary to know that y 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

4. The display will show

5. The display will show Calibration section below.

key for about 5 seconds.

if the instrument is calibrated properly.

if the instrument requires calibration. Please see the

Calibration

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

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. 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° 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.

while pressing . As soon as the power turns on, release and and then

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DMG100 User’s Guide

A standard alkaline battey may not provide acceptable battery life at temperatures below 0

Parts Diagram

Restoring Factory Calibration

The original factory calibration can be restored at any time by the following procedure:

1. Turn the DMG100 power off.

2. Hold

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.

3. Press

4. The gauge will beep 5 times and return to normal operation. The DMG100 is now reset to the original factory calibration.

while pressing . As soon as the power turns on, release and and then

five times followed by .

Troubleshooting

Under certain conditions, the display may read or . Please use the table below to determine and fix the problem:

Display Mode Possible Problem Solution

Sensor Contaminated Clean the Vacuum Sensor

Normal

Operation

Calibration Sensor Contaminated

Calibration

Ambient Temperature too

Low

Gauged Warmed too

Quickly

Gauge Disturbed During

Calibration

Turn the BluVac off, warm the

vacuum port with your hand,

and turn the BluVac back on.

Clean the Vacuum Sensor

and Restart Calibration

Restart Calibration. Allow the

Gauge to Warm Slowly

Restart Calibration. Leave

the Gauge Undisturbed

During Warming Phase.

Low Temperature Operation

The DMG100 can operate accurately at temperatures as low as 10°F (-12°C). While operating below freezing (32°F/0°C), the display update rate will slow from 3.5 readings every second to one reading every two seconds.

For low temperature operation, a 9V Lithium battery is recommended.

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°C (32°F).

UEi Test Instruments DMG100 User manual

Specifications and Main Features

Frequently Asked Questions

User Manual