Instructions
DPG1000DR, F4DR
Types of Gauges
Gauge reference types read zero with the gauge port open.
Bipolar ranges read positive pressure and vacuum in the same
units, and zero with the gauge port open.
1000 psi and higher sensor are a sealed reference type. They read
zero with the gauge port open are internally referenced to 14.7 psi.
They are functionally similar to gauge reference sensors.
Absolute reference gauges read zero at full vacuum and atmospheric
pressure with the gauge port open. With an open gauge port, read-
ings will vary continuously due to fluctuating barometric pressure.
Calibration Preparation
Gauges are calibrated at the factory using equipment traceable to NIST.
There is no need to calibrate the gauge before putting it into service.
Calibration should only be performed by qualified individuals using
appropriate calibration standards and procedures. Gauges can
be returned to factory for certified recalibration and repairs. NIST
traceability is available.
Calibration intervals depend on your quality control program
requirements and as-found data. Many customers calibrate their
equipment annually.
The calibration equipment should be at least four times more accu-
rate than the gauge being calibrated. The calibration system must
be able to generate and measure pressure and/or 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.
Use a stable DC power supply and an accurate mA meter for
calibration of 4-20 mA transmitters and an accurate volt meter for
calibration of voltage transmitters.
Allow the gauge to equalize to normal room temperature for at least
20 minutes before calibration.
Calibration
NEVER connect retransmission output wires together or to an
external power source or permanent damage not covered by war-
ranty will result.
For 4-20 mA output models, be sure to observe the output compli-
ance (voltage drive) capabilities of the gauge. The compliance, and
therefore the maximum loop resistance the output can drive, is a
function of the supply voltage to the gauge.
Consult the graph shown below for maximum loop resistance vs. power
supply voltage. Too large a loop resistance will cause the gauge output
to “limit” or saturate before reaching its full 20 mA output.
When using the 0-2 volt retransmission output, do not allow the
resistive load on the output to fall below 5K ohms. Avoid large
capacitive loads (greater that 1000 pF) such as those caused by
long runs of shielded cable. For long cable runs, use a 4-20 mA
output model.
The DPG1000DR and F4DR are designed for continuous operation.
The gauge is powered on whenever a supply voltage is applied.
Warm-up time is negligible. During normal operation the system
pressure is displayed on the LCD and a corresponding output signal
is present.
DPG1000DRBL and F4DRBL display backlighting are on whenever
the power is on. The display backlighting will not be apparent under
bright lighting conditions.
The output is a continuous analog signal based on the transducer
output rather than the display. The output is filtered to improve
noise immunity and has a response time of about 50 msec.
Characteristics of the output types are listed below. Values are
factory set. Note that –15 psi, –100 kPa, etc. are not achievable, but
prevents running out of range at whatever full vacuum is reached.
Electrical Connection
The DPG1000DR and F4DR series can be powered by any 9 to
32 VDC or 8 to 24 VAC 50/60 Hz power source. An inexpensive
unregulated low voltage source can be used. The magnitude of the
supply voltage has negligible effect on the gauge calibration as long
as it is within the stated voltage ranges.
Do not allow the gauge supply voltage fall below 9 VDC or 8 VAC RMS.
Operation below these values may cause erratic or erroneous readings
or output. Models with 4-20 mA output power the current loop. Use a
power source with sufficient voltage to operate the current loop.
Connection is made with the four conductor cable at the gauge
rear. This cable accommodates both the gauge power supply and
retransmission output.
Connect power as shown below. When using low voltage AC
power, either polarity may be used. Use the correct polarity with
a DC supply.
Connect the retransmission output as shown below. Use of the
shield (drain) wire is optional. It is not generally needed for 4-20 mA
current loops unless very long cable lengths are used in electrically
noisy environments.
The power supply (–) l ead is tied to the retransmission output
ground. Therefore, if a DC supply is used, the power supply (–) lead
should be considered common with regard to the retransmission
output (–) connection.
If the analog output is not required, the transmitter will function as
a low voltage powered gauge. Protect the output wires to prevent
a short circuit.
Using the Retransmission Output
Operation
Test Function
1. See rear label of gauge for range.
2. Remove the covers on the Zero and Span controls on the front of
the gauge. Zero calibration must be done before span calibration.
If desired, gauges can be zeroed without doing span calibration.
3. Connect gauge to a 9-32 VDC or 8-24 VAC 50/60 Hz power
source. The magnitude of the supply voltage has negligible
effect on the gauge calibration as long as it is within the stated
voltage ranges. Over voltage may result in damage.
4.
Zero for gauge reference pressure or vacuum gauges:
With
the gauge port open to atmosphere, adjust the Zero potenti-
ometer for a display indication of zero with the minus (–) sign
occasionally flashing. Output should be 4.0 milliamps for mA
output models or 0 volts for voltage output models.
Zero for absolute reference gauges:
Apply full vacuum to the
gauge. Adjust the Zero potentiometer for a display indication of
zero with the minus (–) sign occasionally flashing. Output should
be 4.0 milliamps for mA output models or 0 volts for 0-2 volt
output models.
Zero for bipolar gauges:
Apply full vacuum to the gauge.
Adjust the Zero potentiometer for a display indication of full
vacuum. Output should be 4.0 milliamps for mA output models
or 0 volts for 0-2 volt output models.
5.
Span for gauge reference pressure, absolute reference, and
bipolar gauges:
Apply full-scale pressure and adjust the Span
potentiometer for a display indication equal to full-scale pres-
sure. Output should be 20.0 milliamps for mA output models or
2 volts for voltage output models.
Span for gauge reference vacuum gauges:
Apply full vacuum
to the gauge. Adjust the Span potentiometer for a display indica-
tion equal to full-scale vacuum. Output should be 20.0 milliamps
for mA output models or 2 volts for voltage output models.
6. Verify pressure indications at 0%, 25%, 50%, 75%, and 100%
of full scale and repeat calibration as needed to achieve best
accuracy over desired operating range.
7. Internal Zero and Span potentiometers adjust the analog out-
put to agree with display. These normally do not need to be
adjusted. If the output does need adjustment, remove the rear
cover to access the potentiometers. See image below. Adjust
output Span and then Zero after gauge calibration is complete.
8. Replace the potentiometer covers, rear cover and screws, taking
care not to pinch the wires between the case and the rear cover.
When the front-panel TEST button is held depressed, the display
and analog output are switched, independent of the system pres-
sure, to a test level determined by the setting of the Test potenti-
ometer. This test mode will allow setup and testing of the output
by switching to this test level whenever desired without having to
alter the system pressure.
To set the test output level, see gauge label for location of Test
potentiometer. Remove the Test potentiometer cover. Press and
hold the front-panel TEST button and adjust the Test potentiometer
to set the display and output to the desired test level.
8 12 16 20 24 28 32
Supply Voltage (DC or AC RMS)
Voltage Compliance for 4-20 mA Retransmission Output
1400
1200
1000
800
600
400
200
0
DC Backlit & Non-Backlit
AC Backlit
AC
Output
Span
Output
Zero
Precautions
4
Read these instructions before using the gauge. Configuration may
be easier before installation. Contact the factory for assistance.
4
These products do not contain user-serviceable parts. Contact us
for repairs, service, or refurbishment.
4
Gauges must be operated within specified ambient temperature ranges.
4
Outdoor or wash down applications require a NEMA 4X gauge or
installation in a NEMA 4X housing.
4
Use a pressure or vacuum range appropriate for the application.
4
Use fittings appropriate for the pressure range of the gauge.
4
Due to the hardness of 316 stainless steel, it is recommended that
a thread sealant be used to ensure leak-free operation.
4
For contaminated media use an appropriate screen or filter to
keep debris out of gauge port.
4
Remove system pressures before removing or installing gauge.
4
Install or remove gauge using a wrench on the hex fitting only. Do
not attempt to turn gauge by forcing the housing.
4
Good design practice dictates that positive displacement liquid
pumps include protection devices to prevent sensor damage from
pressure spikes, acceleration head, and vacuum extremes.
p
Avoid permanent sensor damage! Do not apply vacuum to non-
vacuum gauges or hydraulic vacuum to any gauges.
p
Avoid permanent sensor damage! NEVER insert objects into
gauge port or blow out with compressed air.
Gauges are not for oxygen service. Accidental rupture of sensor dia-
phragm may cause silicone oil inside sensor to react with oxygen.
p
NEVER connect the gauge wires directly to 115 VAC or perma-
nent damage will result.
RED +
BLACK –
GREEN –
WHITE +
Optional
shield
connection
Power (+)
Power (–)
Remote Device
–
+
com.
Range Type
Output
Option –15 psi
“0” on
display
Full
pressure
Gauge reference
pressure
-I
n/a
4 mA
20 mA
-V
n/a
0 V
2 V
Gauge reference
vacuum
-I
20 mA
4 mA
n/a
-V
2 V
0 V
n/a
Absolute reference
-I
4 mA
4 mA
20 mA
-V
0 V
0 V
2 V
Gauge reference
vacuum/pressure
-I
4 mA
12 mA
20 mA
-V
0 V
1 V
2 V
Output Ranges
cecomp.com
1220 American Way Libertyville, IL 60048
800-942-0315
CECOMP
Div. of
A
BSOLUTE
P
ROCESS
I
NSTRUMENTS
Cecomp maintains a constant effort to upgrade and improve its products.
Specifications are subject to change without notice. See cecomp.com for
latest product information. Consult factory for your specific requirements.
WARNING:
This product can expose you to chemicals including
lead, nickel and chromium, which are known to the State of
California to cause cancer or birth defects or other reproductive
harm. For more information go to www.P65Warnings.ca.gov
