Cooper Instruments DPG1000DRBL Installation Manual

DPG 1000DR

Digital Pressure Gauge

USER’S GUIDE

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Installation and Precautions

Install or remove the gauge-using wrench on hex fitting only. Do not attempt to tighten by turning housing or
any other part of the gauge. Use fittings appropriate for the pressure range of the gauge. Do not apply
vacuum to gauges not designed for vacuum operation. 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.

Electrical Connection

NEVER connect the gauge wires directly to 115 VAC or permanent damage not covered by warranty will

result.
The DPG1000DR and DPG1000DRBL can be powered by any 9 to 32 VDC or 8 to 24 VAC 50/60 Hz power

source. An inexpensive unregulated low voltag e 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 4-conductor cable at the gauge rear. This cable accommodates both the gauge
power supply and retransmission output. This cable has one RED and one BLACK lead. If using a 9 to 32
VDC power source, connect the (+) supply to the RED lead and the (–) supply to the BLACK lead. If using a
8 to 24 VAC 50/60 Hz power source, connect to the RED and BLACK leads. When using low voltage AC
power, there is of course, no polarity consideration.

The (+) retransmission output appears on the WHITE lead, and the (–) retransmission output appears on the
GREEN lead. Use of the shield (drain) wire of the retransmission output 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 output is a continuous analog signal based on the transducer output rather than the display. This output
is filtered to improve noise immunity and has a response time of about 50 milliseconds.

The power supply (–) lead 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.

Using the Retransmission Output

NEVER connect retransmission output wires together

or to an external power source or permanent damage
not covered by warranty will result.

For 4-20 mA output models, be sure to observe the
output compliance (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 at right for maximum loop resistance vs.
gauge 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. Also, avoid large capacitive loads (greater that
1000 pF) such as those caused by long runs of
shielded cable. For long retransmission runs, use the
4-20 mA output model instead.

CF 144 1 DPG 1000DR