Calibration Information
All gauges are factory calibrated on NIST traceable calibra-
tion equipment. No calibration is required before placing the
gauge into service.
Gauges can be returned to Omega Engineering for factory
certified recalibration. NIST traceability is available. Gauges
can also be recalibrated by any metrology lab with pressure
calibration equipment at least four times more accurate
than the gauge.
Absolute reference models display atmospheric pressure if
the gauge port is open to the ambient. It is normal for the
reading to constantly change in response to atmospheric
pressure changes. Vacuum generation and atmospheric
pressure measurement equipment for accurate calibration
and thus these are more difficult to calibrate in the field.
Calibration Preparation – All Models
All gauges are factory calibrated using NIST traceable cali-
bration equipment. Calibration is not required before using
the gauge. Calibration intervals depend on your quality
standards, but annual re-calibration is customary.
Calibration equipment is not required to zero gauge refer-
ence ranges. Absolute reference ranges may be zeroed with
application of full vacuum.
Span calibration should only be performed using appropriate
calibration procedures with calibration standards that are
at least four times more accurate than the gauge being
calibrated.
The calibration system must be able to generate and mea-
sure pressure/vacuum over the full range of the gauge. A
vacuum pump able to produce a vacuum of 100 microns
(0.1 torr or 100 millitorr) or lower is required for vacuum
and absolute gauges.
Connect gauge to a 8-24 VAC 50/60 Hz or 9-32 VDC power
supply.
Allow the gauge to equalize to normal room temperature for
approximately 20 minutes before calibration.
Calibration of Ranges up to 1999
For DPG1000AD and DPG1100AD models remove the front
covers to access the zero and span calibration potentiom-
eters.
For DPG1100AD models unscrew the nylon cover screws to
access the zero and span calibration potentiometers.
Gauges may be re-zeroed without affecting the span cali-
bration. For gauge reference models the gauge port must
be open to the ambient. For absolute reference models full
vacuum must be applied.
Adjust the zero control until the gauge reads zero with the
minus (–) sign occasionally flashing.
Zero calibration must be done before span calibration.
Using the appropriate pressure standards, record readings at
three to five points over the range of gauge and adjust span
control to minimize error and meet specifications.
Calibration of Ranges 2000 and up including
3000 psi, 5000 psi
Entering Calibration Mode
Remove the rear cover to gain access to the UP and DOWN
buttons located near the lower right and left corners of the
circuit board.
With the gauge off, press and hold the DOWN calibration
button, and also press the front button.
The full-scale pressure range and display test is shown, and
then CAL is displayed to indicate that the calibration mode
is enabled.
Release all buttons. The gauge enters and remains in
the calibration mode until restarted manually or power is
removed. Features not related to calibration are disabled.
If the power is removed during calibration, settings will not
be saved.
The display will indicate the current pressure reading,
updating approximately 3 times per second.
Each press of the UP or DOWN button makes a small
correction, which may not always be indicated on the
display. Press and hold the button for one second or longer
to make larger corrections. The gauge’s display is adjusted
to match the calibrator’s reading.
Gauge Reference Ranges (3 Points)
With the gauge port open to atmosphere, the character
display will alternate between ZERO and CAL. Press the UP
and DOWN buttons to obtain a display indication of zero.
Apply full-scale pressure (or vacuum for vacuum gauges).
The character display will alternate bSPAN and
CAL. Press the UP and DOWN buttons to obtain a display
indication equal to full-scale pressure.
Apply 50% of full-scale pressure. The character display will
alternate bMID and CAL. Use the UP and DOWN
buttons to obtain a display indication equal to 50% of full-
scale pressure.
Absolute Reference Ranges (3 Points)
Apply full vacuum to the gauge. The character display will
alternate between ZERO and CAL. Press the UP and DOWN
buttons to obtain a display indication of zero.
Apply full-scale pressure. The character display will
alternate bSPAN and CAL. Press the UP and
DOWN buttons to obtain a display indication equal to full-
scale pressure.
Apply 50% of full-scale pressure. The character display will
alternate bMID and CAL. Press the UP and DOWN
buttons to obtain a display indication equal to 50% of full-
scale pressure.
Bipolar (±) and Compound Ranges (4 or 5 Points)
With the gauge port open to atmosphere, the character
display will alternate between ZERO and CAL. Press the UP
and DOWN buttons to obtain a display indication of zero.
Apply full-scale positive pressure. The character display
will alternate bSPAN and CAL. Press the UP and
DOWN buttons to obtain a display indication equal to full-
scale pressure.
Apply 50% of full-scale positive pressure. The character
display will alternate bMID and CAL. Press the UP
and DOWN buttons to obtain a display indication equal to
50% of full-scale pressure.
Apply full vacuum. The character display will alternate
between –SPAN and CAL. Press the UP and DOWN buttons
to obtain a display indication equal to the full vacuum
reading.
Gauges using a ±15 psig sensor have a –MID calibration
point. Apply 50% of the full-scale vacuum range (for
example, –7.4 psi for a ±15 psi gauge). The character
display will alternate between –MID and CAL. Press the UP
and DOWN buttons to obtain a display indication equal to
50% of full-scale vacuum.
Exit Calibration Mode and Verify Calibration
Exit the calibration mode and save the calibration data
by pressing and holding the front button until the display
indicates OFF.
Verify readings at 0%, 25%, 50%, 75%, and 100% of full
scale.
Replace the rear cover and screws, taking care not to pinch
the wires between the case and the rear cover.
DPG1000AD, DPG1001AD, DPG1000ADBL, DPG1100AD, DPG1100ADBL
3
DOWN
UP
DPG1100AD, DPG1100ADBL
Ranges above 2000
NOTE:
DPG1000, DPG1001
DPG1100
DPG1000AD, DPG1001AD,
DPG1000ADBL Ranges above 2000
