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DPG1000DAR Series Digital Pressure Gauges with Alarms and 4-20 mA Output
Installation 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 Do not exceed relay current and voltage ratings. Use an appropri-
ate contactor for larger loads. Inductive inrush currents may be up
to 5x normal current and may require an RC snubber.
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.
Avoid permanent sensor damage! Do not apply vacuum to non-
vacuum gauges or hydraulic vacuum to any gauges.
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.
NEVER connect the gauge wires directly to 115 VAC or perma-
nent damage will result.
Types of Gauges
Gauge reference models read zero with the gauge port open.
Compound ranges read vacuum in inches of Mercury, pressure in
psig, and zero with the gauge port open.
1000 psi and higher sensors 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 atmo-
spheric pressure with the gauge port open. Note that readings of
atmospheric pressure vary continuously.
Electrical Connections
The DAR 4-conductor cable with the RED and BLACK leads is for
the gauge power supply.
DAR Output
Green is com-
BLACK
mon with Black
RED
NC 1
Analog output wires
C
1
NO 1
GREEN
NC 2
C
2
6-conductor relay wires
NO 2
BLACK NC Normally Closed
RED
C Common
Alarm Contact
NO Normally Open
Ratings
GREEN
NC Normally Closed
0.5A/115VAC,
1A/24VDC,
BROWN
C Common
non-inductive
BLUE
NO Normally Open
Connect to 8-24 VAC, 50/60Hz or 9-32 VDC. The gauge will operate
on either AC or DC power and there is no need to observe polarity.
An unregulated power supply can be used. Note that standard 24
VAC transformers with small loads may operate at voltages over the
24 VAC limit. The supply voltage, when within the stated ranges,
has negligible effect on the gauge calibration. Operation below 9
VDC or 8 VAC may cause erratic or erroneous readings or output.
When operating multiple gauges from the same power supply, refer
to the mA rating in the specifications to ensure adequate power.
Route the wires away from heat sources and moving equipment.
Contact Rating and Protection
The alarm contacts are rated at 1A/24VDC or 0.5A/115VAC. Using
mechanical relay contacts above their rating, or with large inductive
loads, will shorten their life. For inductive loads, RC snubbers or arc
suppression devices are required to protect the contacts. For large
loads a higher capacity contactor is required.
No internal fusing is included in the alarm contact circuits. The
alarm outputs should be externally fused by the user in applications
where good design practice dictates.
Power
Up
The gauge is powered on whenever a supply voltage is applied.
Warm-up time is negligible. The gauge may be left on at all times.
All configuration information is stored in non-volatile memory.
When power is first applied, the gauge proceeds through a startup
sequence. During the startup sequence, relays are de-energized,
the status LEDs are off, and the retransmission output is low (0 mA).
1. The firmware version number is displayed briefly
2. All active display segments are turned on for approx. 1 second.
3. The full scale pressure is indicated for approx. 1 second while the
engineering units and FS (full scale) are indicated for 1/2 second
on the character display.
4. The display is tested again for approximately 1 second.
The gauge then proceeds to the normal operating mode.
For DAR models the retransmission output corresponds to the
applied pressure.
Alarm Types
The factory default configuration is 1% fixed deadband mode, zero
tare enabled, and no pass code required for test function.
Alarms may be configured to operate in fixed deadband mode or
adjustable hysteresis mode.
In the fixed deadband mode, the alarm set/reset point deadband is
factory set to 1% of full-scale. Each alarm may be configured as
either HI or LO with a user adjustable alarm set point for each relay.
In the adjustable hysteresis mode, two independent set and reset
trip points are user adjustable for each relay. The set or reset state
at power up when between trip points is user configurable.
Operation with Fixed Deadband Alarms
Each relay may be independently configured as a high or low alarm
in User Set-up and operate as shown in the table below.
Pressure
Relay coil
Alarm 1 continuity
Alarm 2 continuity
LED
Pressure
Relay coil
Alarm 1 continuity
Alarm 2 continuity
LED
Pressure
Power wires
Relay coil
8-24 VAC 50/60 Hz or
Alarm 1 continuity
9-32 VDC
Alarm 2 continuity
LED
+ Output
– Output
Pressure
Relay coil
Alarm 1 continuity
Alarm 2 continuity
SPDT
1
LED
The relevant LCD alarm icon will indicate an alarm condition.
SPDT
The relevant bi-color LED will be illuminated green for a normal
2
condition or red for an alarm condition.
The LED will blink at a slow rate until the alarm is acknowledged
unless the annunciator mode was disabled in set-up.
Alarms may be configured to be automatically acknowledged when
the alarm condition clears or configured to be manually acknowl-
edged by pressing the TEST button.
The applied pressure, the value of Trip Point 1, and the value of Trip
Point 2 may be selected for display as follows:
When the applied pressure is being displayed, press and release
the SEL button. The Trip Point 1 value will be displayed with TRIP1
on the lower display.
When the Trip Point 1 value is being displayed, press and release
the SEL button. The upper display will indicate the Trip Point 2 value
with TRIP2 on the lower display.
When the Trip Point 2 value is being displayed, press and release
the SEL button. The upper display will indicate the applied pressure
with engineering units on the lower display.
Normal acting, High alarm SP_H
< Set point – 1%FS
> Set point
On
Off
C-NO (Red-White)
C-NC (Red-Black)
C-NO (Brown-Blue)
C-NC (Brown-Green)
Green
Red
Normal acting, Low alarm SP_L
< Set point
> Set point + 1%FS
Off
On
C-NC (Red-Black)
C-NO (Red-White)
C-NC (Brown-Green)
C-NO (Brown-Blue)
Red
Green
Reverse acting, High alarm SP_H
< Set point – 1%FS
> Set point
Off
On
C-NC (Red-Black)
C-NO (Red-White)
C-NC (Brown-Green)
C-NO (Brown-Blue)
Green
Red
Reverse acting, Low alarm SP_L
< Set point
> Set point + 1%FS
On
Off
C-NO (Red-White)
C-NC (Red-Black)
C-NO (Brown-Blue)
C-NC (Brown-Green)
Red
Green
Operation with Adjustable Hysteresis Alarms
In the adjustable hysteresis mode, two independent set and reset
trip points used for each relay and operate as shown below.
Normal (Fail-safe) acting, RESET value less than SET
Pressure
< Low
RESET
point
Relay coil
On
Alarm 1 continuity
C-NO (Red-White)
Alarm 2 continuity
C-NO (Brown-Blue)
LED
Green
Normal (Fail-safe) acting, SET value less than RESET
Pressure
< Low
SET
point
Relay coil
Off
Alarm 1 continuity
C-NC (Red-Black)
Alarm 2 continuity
C-NC (Brown-Green)
LED
Red
Reverse acting, RESET value less than SET
Pressure
< Low
RESET
point
Relay coil
Off
Alarm 1 continuity
C-NC (Red-Black)
Alarm 2 continuity
C-NC (Brown-Green)
LED
Green
Reverse acting, SET value less than RESET
Pressure
< Low
SET
point
Relay coil
On
Alarm 1 continuity
C-NO (Red-White)
Alarm 2 continuity
C-NO (Brown-Blue)
LED
Red
Power-up relay state when between SET and RESET
Config. set to SP_L
RESET
Config. set to SP_H
The LEDs indicate green for a RESET state and red for a SET state.
Refer to the table for output states as a function of applied pressure.
If the gauge is configured for alarms, ALARM1 and ALARM2 will be
indicated when alarm conditions exist, and the associated LEDs will
blink to indicate unacknowledged alarm conditions.
Alarms may be configured to be automatically acknowledged when
the alarm condition clears or configured to be manually acknowl-
edged by pressing the TEST button.
The applied pressure, the SET trip points, and the RESET trip points
may be selected for display as follows.
While the applied pressure is being displayed, press and release the
SEL button. The upper display will indicate the value of set point 1
with 'SET_1' on the lower display.
While set point 1 is being displayed, press and release the SEL but-
ton. The upper display will indicate the value of reset point 1 with
'RST_1' on the lower display.
While reset point 1 is being displayed, press and release the SEL
button. The upper display will indicate the value of set point 2 with
'SET_2' on the lower display.
While set point 2 is being displayed, press and release the SEL but-
ton. The upper display will indicate the value of reset point 2 with
'RST_2' on the lower display.
While the reset point 2 is being displayed, press and release the
SEL button. The upper display will indicate the applied pressure
and engineering units.
DAR Output Types
DAR models have a 4-20 mA retransmission output that corre-
sponds to the applied pressure, except when in zero/tare mode,
test mode, or during setup. Characteristics of the output types are
listed below.
Sensor
Full vacuum
display
Gauge ref. pressure
n/a
Gauge ref. vacuum
20 mA
Absolute reference
4 mA
See specifications for output resolution. Note that analog output
resolution is always over the entire sensor range and is updated
approximately 16 times per second.
The 4-20 mA output provides power to the current loop and output
drive is determined by power source.
> High
SET
point
Off
C-NC (Red-Black)
C-NC (Brown-Green)
Red
> High
RESET
point
On
C-NO (Red-White)
C-NO (Brown-Blue)
Green
> High
SET
point
On
C-NO (Red-White)
C-NO (Brown-Blue)
Red
> High
RESET
point
Off
C-NC (Red-Black)
C-NC (Brown-Green)
Green
SET
"0" on
Full
pressure
4 mA
20 mA
4 mA
n/a
4 mA
20 mA
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