Omega Engineering DPG1100B, DPG1000BBL Calibration Precautions, Calibration Information, Downup

DPG1000B, DPG1001B, DPG1000BBL, DPG1100B, DPG1100BBL 3

CAUTION:

Calibration Precautions

Install or remove gauge using wrench on hex fitting only. Do not attempt to tighten by turning housing or any other part of the gauge.

See label on back of gauge for range!

Use fittings appropriate for the pressure range of the gauge.

Do not apply vacuum to gauges not specified for vacuum operation. Permanent damage not covered by warranty will result to the sensor.

Due to the hardness of 316 stainless steel, it is recommended that a thread sealant be used to ensure leak-free operation.

NEVER insert objects into the gauge port or blow out with compressed air. Permanent damage not covered by warranty will result to the sensor.

NOTE:

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 – These 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

a. Calibration should only be performed by qualified individuals using appropriate calibration standards and procedures.

b.The calibration equipment should be at least four times more accurate than the gauge being calibrated.

c.Remove the screws on the back of the unit and remove cover.

d.It is good practice to install fresh batteries before calibrating battery- powered gauges.

e.Allow the gauge to equalize to normal room temperature before calibration.

DPG1000, DPG1001 - Pull out plastic	DPG1100 - Unscrew nylon screws to
plugs to access zero and span	access zero and span potentiometers
potentiometers

Calibration of Ranges up to 1999

Remove the calibration potentiometer covers on the front of the unit to access the zero and span controls.

Gauge reference units may be re-zeroed without affecting the span calibration. The gauge port must be open to the ambient with no pressure or vacuum applied. Adjust the Zero control until the gauge reads zero with the minus (–) sign occasionally flashing.

Span calibration should only be attempted if the user has access to a pressure reference of known accuracy. The quality of the calibration is only as good as the accuracy of the calibration equipment and ideally should be at least four times the gauge accuracy. Zero calibration must be done before span calibration. Record readings at three to five points over the range of gauge and adjust span control to minimize error and meet specifications.

DPG1000B, DPG1001B, DPG1000BBL	DPG1100B, DPG1100BBL
Ranges 2000 and up	Ranges 2000 and up

DOWNUP

Calibration of Ranges 2000 and up (with 4-digit 2-line display)

1.Entering the Calibration Mode

a.Remove the back cover and note the locations of the two internal calibration pushbuttons marked UP and DOWN. These buttons are disabled unless the gauge is in calibration mode.

b.With the gauge off, press and hold the DOWN calibration button, and also press the front button to power up the gauge in calibration mode.

2.Calibration Mode Functions

a.The display first indicates the gauge’s full-scale pressure range, tests all display segments, and then indicates CAL to indicate that the gauge is in the calibration mode. Release all pushbuttons.

b.The display will then indicate the current pressure reading, updating approximately 3 times per second. The gauge will remain in the calibration mode until powered down or reset manually. While in the calibration mode, the shutoff timer, One Touch Zero (gauge reference models only), Min/Max (for applicable models) are all disabled, and the calibration pushbuttons are active.

c.Each press of the UP or DOWN button makes a small correction, which may not always be indicated on the digital display. Press and hold the pushbutton for one second or longer to make larger continuous corrections. The display of the gauge being calibrated is adjusted to match the calibrator’s setting or readout.

d.If the battery pack is unplugged or the power removed during calibration, calibration settings will not be saved.

3.Gauge Reference Gauges (3 Points)

a.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.

b.Apply full-scale pressure. The character display will alternate between +SPAN and CAL. Press the UP and DOWN buttons to obtain a display indication equal to full-scale pressure.

c.Apply 50% of full-scale pressure. 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 pressure.

4.Exit Calibration Mode and Verify Calibration

a.Exit the calibration mode and save the calibration data by pressing and holding the front button until the display indicates OFF.

b.Verify pressure indications at 0%, 25%, 50%, 75%, and 100% of full scale.

c.Replace the rear cover and screws, taking care not to pinch the power leads between the case and the rear cover.