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DC Powered Digital Pressure 

Gauge with Dual Alarms

DPG104

INSTRUCTION

SHEET

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Introduction

DPG104 is an integrated pressure 
gauge with display and control 
used to monitor hydraulic fluids.  
It monitors the pressure via the 
resistance measured on an isolation 
membrane.  The output signal 
is amplified by a high-precision, 
low-temperature drift amplifier.  
The signal is then fed into a high 
accuracy A/D converter for the 
microprocessor to process and then 
show on the LED display.  

This flexible, simple to operate 
digital pressure guage is safe, 
reliable, and easy to debug.  The 
DPG104 is widely used in hydro-
power, water, petroleum, chemical, 
mechanical, hydraulic, and other 
industries.

Features

•  High resolution, 4-digit LED 
display
•  100mm standard gauge dial
•  220V / 3A relay output

Specifications

Note, if the fluid being measured 
exceeds 80ºC, select the high 
temperature accessory.

• Measuring Range

-0.1~0~100MPa

• Accuracy Range

 

±0.25% for gauge 

pressure >5psi

±0.5% FS for all others 

including absolute, 

compound gauge, and 

Vacuum ranges

• Overload Pressure

 

150%~200%

• Pressure Type

A/G/D

• Stability

0.1% FS per year

• Power Supply

13 to 30VDC

• Display

4 digits

• Screen Size

0.56”LED

• IP Rating

IP

40

• Relative Humidity

90%

• Operating Tem

p

-30ºC ~ 80ºC

• Fluid Temp

-40ºC ~150ºC

• Response Time

< 30ms

• Thread Size

1/4 NPT Male

• Thread Material

SS316

• Output (S) model

4-

20mA

Dimensions

Mechanical Installation

Install directly on the hydraulic pipe 
line.  Other size connectors can be 
ordered.  In high vibration / shock 
environments, pressure pipe joints 
can be mechanically decoupled 
through the use of hoses.  

NOTE: Vertical installation is required 
when the measuring range is less 
than 100kPA

.

Electrical Installation

Notes to prevent Interference
•  Keep connection as short as 
possible
•  Use shielded wire
•  Avoid direct access to the wiring 
of the user’s device or devices 
causing interference.
•  When using mini hoses, ground 
the shell separately

Alarms

 

The DPG104’s are provided with two 
SPDT relays that provide the user 
the capability to have each alarm 
have a normal acting(normally 
closed) and reverse acting (normally 
open) output.” As a fail safe in the 
event of a sensor power down, the 
normally closed relay output will 
enable the alarm.

Operating Instructions

The programming menu uses the 
following terms to describe the 
various settings

•  AL1H: Swtich 1 pull-on value
•  AL1L: Switch 1 drop-out value
•  AL2H: Switch 2 drop-in value
•  AL2L: Switch 2 drop-out value
•  FILt: Filter coefficeint to prevent 
spurious pulses triggering switch 
inputs

To make changes:

•  Press SET button until LED 
display says LOCK
•  Press 

or 

 to enter the 

password (0001)
•  Press SET to enter the selected 
menu (AL1H, AL1L, AL2H, AL2L, FILt)
•  Press 

or 

 to change the value.

NOTE: If you press and hold the SET 
button for 30 seconds while editing 
the settings, you will exit Setup 
mode and no changes will be saved.

M5703/

0

1

1

9

OUT + OUT -

RELAY 1

RELAY 2

POWER

+

-

AL1H

AL1F AL2H

AL2F

NOTE: 

In order to offset the gauge 

back to zero, press the middle button 
for 5 seconds, then the display will be 
back to zero.

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