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Digital Pressure Switch

User Guide

USER GUIDE

Contents

Product Overview and Features....................................................................................................3

Installation and Wiring ..................................................................................................................5

Digital Output Modes.....................................................................................................................6

Analog Output Characteristics.......................................................................................................7

Initial Settings ...............................................................................................................................8

Setting Digital Outputs ..................................................................................................................9

Setting the Zero Point ...................................................................................................................10

Setting Max. and Min. Display Values...........................................................................................11

Setting Up the Key Lock Function.................................................................................................11

Using the Copy Function...............................................................................................................12

Advanced Settings........................................................................................................................12

Calibration and Fine Adjustment Mode .........................................................................................14

FAQ..............................................................................................................................................14

Support.........................................................................................................................................15

Product Overview and Features

DPS Series digital pressure switches provide a compact and economical solution for monitoring system

pressure via an integral digital display, two programmable digital outputs and an optional analog output.

Designed for use with MFD FRL products, DPS Series switches can be mounted directly to MFD

regulators, filter/regulators, and soft start valves using available adapter kits. Or, the DPS can be

standalone mounted via the male center-back port, available panel adapter, or threaded mounting

holes.

Significant Features and Benefits

•Easy to read digital display

-Programmable display units: psi, bar, MPa, and kg/cm2

-Dual digital output indicators

-Two programmable display colors

•Multiple output options

-Two individually-programmed sinking (NPN) or sourcing (PNP) digital outputs standard

-One 1-5V or 4-20mA analog output optional

•Technical highlights

-Copy settings to a second pressure switch automatically with the available copy function

-User-selectable hysteresis and switching modes

-IP65 enclosure protection

-Adjustable response time to eliminate chatter

How to Order

Dimensions [mm]

4.4 DP.

Engineering Specifications

Accessories

Panel Adapter and Cover:

DPS-PA

5m Data Cable: DPS-C5M

Display Features

Installation and Wiring

Precautions

Apply tightening torque to the hex-shaped boss near the pressure port. Do not attempt to install

the pressure switch by turning the switch body. Serious damage to the switch may result.

Wiring Diagrams

Output 1 Indicator

Output 2 Indicator

UP Button

SET Button

DOWN Button

Pressure Display

Pressure Unit Display

Sensor Breather Port

DPS series switches include a vent port located on the bottom of the switch housing. The vent

port allows atmospheric pressure to the sensor for accurate measurement. To maintain IP65

enclosure protection, install the supplied tube and sintered breather on the vent port. Or, use a

2.5mm I.D. tube to pipe the breather port to a clean, dry location. Do not attempt to pressurize

the breather port, sensor damage will result.

Digital Output Modes

Each digital output has three field-programmable output modes and can be configured as

normally-open or normally-closed. In normally-open mode, the switch contact is made when the

output is active. In normally-closed mode, the switch contact is broken when the output is active.

For information on setting the output contact mode (NC or NO) see the “Initial Settings” section.

Point Set Mode

Point set mode enables the digital output when pressure increases above the setpoint (P1 or

P2) and disables the output when pressure falls below the setpoint minus system hysteresis.

See “Setting Digital Outputs” for information on setting P1 and P2. System hysteresis can be

adjusted between 1 and 8 decimal places. See “Advanced Settings” for further information on

adjusting system hysteresis.

Normally-Open Contact Mode

Normally-Closed Contact Mode

H = System hysteresis

Breather Port

Supplied Tube

Supplied Breather

Hysteresis Mode

Hysteresis mode operates similarly to point set mode but allows the user to set a wider

hysteresis band. The digital output is enabled when pressure rises above H1 or H2 and is

disabled when pressure falls below L1 or L2. For information on setting H1, H2, L1 and L2, see

“Setting Digital Outputs”.

Normally-Open Contact Mode

Normally-Closed Contact Mode

Window Comparator Mode

In window comparator mode, the digital output is enabled when pressure rises above L1 or L2

plus system hysteresis and disabled when pressure rises above H1 or H2 plus system

hysteresis. As pressure decreases, the output is enabled when pressure drops below H1 or H2

and disabled when pressure drops below L1 or L2. For information on setting H1, H2, L1 and

L2, see “Setting Digital Outputs”. To ensure proper function, the difference between H1 and L1

or H2 and L2 must be greater than the system hysteresis, H (see “Advanced Settings”).

Normally-Open Contact Mode

Normally-Closed Contact Mode

H = System hysteresis

Analog Output Characteristics

DPS series switches are available with either 1-5V or 4-20mA analog output signals. The analog

output signal is proportional to the full pressure range of the DPS series switch. Output signals

for 1-5V and 4-20mA models are plotted against pressure below.

1-5V Models

4-20mA Models

Initial Settings

The DPS basic settings menu allows the user to setup digital output options, change response

time, and configure the display color and pressure units. To access the basic settings menu,

press and hold the blue “SET” button for three seconds. Press the “SET” button momentarily to

step through the seven settings within the menu. When a setting is selected, the display will

alternate between the setting ID and its value. Use the “UP” and “DOWN” buttons to change a

value and press “SET” to save.

Basic Settings

Setting ID

Value

Measurement

Mode

>3s

Digital Output

1 Operating

Mode

oPS HYS Win

Point Set Hysteresis Window Comparator

See “Digital Output Modes” for more information.

Digital Output

1 Contact

Type

no nc

Normally-Open Normally Closed

Digital Output

2 Operating

Mode

oFF oPS HYS Win

Off Point Set Hysteresis Window

See “Digital Output Modes” for more information.

Digital Output

2 Contact

Type

no nc

Normally-Open Normally Closed

Response

Time

2.5 25 100 …

2.5mS 25mS 100mS …

Increase response time to reduce chatter when pressure fluctuates near the setpoint.

oE1

0.0

oE2

rES

Display Color

5oG 5oR Grn rEd

ON: Green ON: Red Constant Green Constant Red

ON: Green = Display turns green when the linked output is enabled

ON: Red = Display turns red when the linked output is enabled

See “Advanced Settings” for information on linking an output to color.

Display Units

PA GF bAR P5i

MPa kgf/cm2bar psi

Measurement

Mode

Setting Digital Outputs

Press the blue “SET” button momentarily to access the pressure setting menu. Press the “SET”

button repeatedly to step through the available pressure setting variables. When a variable is

selected, the display will alternate between the variable ID and its value. Use the “UP” and

“DOWN” buttons to change a value and press “SET” to save.

Digital Output Settings

Variable ID

Value

Measurement

Mode

60.0 60.1

65.0 64.9

CoL

Uni

0.0

H-1

L-1

0.0

30.0 30.1

35.0 34.9

Measurement

Mode

Note: If output 2 is disabled in the basic settings menu, pressure variables for that output will not

appear in the output setting menu. Additionally, outputs configured for point set mode in basic

settings will only show P1 and P2 variables.

Setting the Zero Point

The zero point of DPS series switches can be reset to counteract effects of changing

atmospheric pressure. This feature is not intended as an offset and the zero point should only

be reset when system pressure is relieved. To reset the zero point, press and hold the “UP” and

“DOWN” arrow keys simultaneously until the display reads zero pressure.

L-2

h-2

0.0

0.1

0.0

Press and Hold

Indice

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