Calibration Information
All gauges are factory calibrated on NIST traceable
calibration 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
calibration 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
reference 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
measure 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.
It is good practice to install fresh batteries before
calibrating battery-powered gauges.
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
potentiometers.
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
calibration. 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.
DPG1000B, DPG1001B, DPG1000BBL, DPG1100B, DPG1100BBL
3
NOTE:
DPG1000, DPG1001
DPG1100
DOWN
UP
DPG1100B, DPG1100BBL
Ranges above 2000
DPG1000B, DPG1001B,
DPG1000BBL Ranges above 2000
