Digital Pressure Switch User Guide

USER GUIDE

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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

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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.

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Engineering Specifications

Accessories

Panel Adapter and Cover: DPS-PA

5m Data Cable: DPS-C5M

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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

OK NO

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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

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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

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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

oE1

0.0

oE2

oE2

rES

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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/cm2 bar 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

L1

60.0 60.1

H1

65.0 64.9

CoL

Uni

0.0

H-1

L-1

0.0

10

L2

30.0 30.1

H2

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

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Setting the Max. and Min. Display Values Set the maximum and minimum display values to limit the range of pressures displayed on the DPS LCD display. To set the maximum display value, press and hold the “UP” button for at least three seconds. To set the minimum display value, press and hold the “DOWN” button for at least three seconds.

Setting ID Value

Measurement Mode

or >3s

PE*

100.0 99.9

Measurement Mode

*PE = Upper display limit, bo = Lower display limit

Setting Up the Key Lock Function

The key lock function prevents unauthorized users from making changes to the switch settings. To enable the key lock, press and hold the “SET” and “UP” buttons together for at least three seconds. Use the arrow keys to select “on”. Press “SET” to save and exit. To disable the key lock, repeat the process but select “off”.

Setting ID Value

Measurement Mode

+ >3s

Lock Setting

oFF on

0.0

0.0

PE

0.0

LoC

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Measurement Mode

Using the Copy Function The copy function permits quick transfer of settings from a previously configured DPS (master) to a new DPS of the same model (slave). Prior to executing the copy, set the master unit’s copy

setting to on or onL in the advanced settings menu. See the “Advanced Settings” section of this document for more information. Wire the master and slave switches together as shown in the wiring diagram and follow the procedure below. Wiring Diagram for Copy Function

Copy Function Execution Procedure

1) Simultaneously switch power on to the master and slave sensors. 2) Wait approximately five seconds for data to be transferred to the slave. The master and

slave displays may flash during data transfer. 3) When successful data transfer is complete, the master DPS display will alternate

between CPy and Good. The slave DPS display will alternate between 5Lu and

Good. If data transfer was not successful, the slave DPS will display Er8. Attempt the transfer again ensuring that power is switched on simultaneously to both master and slave.

4) Switch off power and disconnect wiring.

Advanced Settings The advanced settings menu allows the user to set system hysteresis, link display color to an output status, enable/disable power save mode, access the copy function settings, reset the DPS, and enter fine adjustment mode. To access the advanced settings menu, press and hold the “SET” button for five seconds.

0.0

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Advanced Settings Setting ID Setting Options

Measurement Mode

>5s

System Hysteresis

3 4 5 …

3 decimal places 4 places 5 places … See FAQ section for more information on system hysteresis and decimal places

Display Color Link

oE1 oE2

Output 1 Output 2 Linking the display color to an output permits the display color to change when the linked output is enabled. See “Basic Settings” for color options.

Power Save Mode

oFF on

Off On In power save mode, the DPS display will turn off after 30 seconds without a button input. Press any button to momentarily turn the display on.

Copy Function

oFF on onl Off On On* *Automatically enables key lock on slave when restarted

Factory Reset

oFF on Off On Resets DPS to original factory settings.

Fine Adjustment

Mode

oFF on

Off On Select “ON” to enter Fine Adjustment Mode. See “Calibration and Fine Adjustment Mode” for more information.

Measurement Mode

D5P

HY5

0.0

5LP

cPY

R5E

Fin

0.0

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Calibration and Fine Adjustment Mode Fine adjustment mode permits adjustment of the displayed pressure and analog output within 2.5% of the detected pressure. The adjustment is applied linearly over the entire pressure range. Enter fine adjustment mode via the advanced settings menu (see “Advanced Settings”) when a known air pressure is applied. Use the “UP” and “DOWN” buttons to adjust the display pressure until it matches the known pressure. Press “SET” to save the adjustment.

FAQ Q: What is the difference between the rated pressure range and the set pressure range? DPS series switches are designed to operate between 0 and 145 psi. However, it is possible to configure some settings between -14.5 and 145 psi. Q: What is system hysteresis and how can it be adjusted? System hysteresis is a stored value used to prevent output chattering. The system hysteresis value controls how digital outputs behave when in point set mode or window comparator mode. For more information on digital output modes, see the “Digital Output Modes” section of this document. System hysteresis can be set between 1 and 8 decimal places in the advanced settings menu (see “Advanced Settings”). For example, when display units are set to psi, selecting a value of 5 will set system hysteresis to 0.5psi. Q: What is the difference between the MFD DPS switches and the DG-06 or DG-08? DPS Series switches and MFD digital gauges (DG-06 and DG-08) all display system pressure but DPS switches are powered externally, offer programmable digital outputs, and an analog output or copy function. For an economical digital pressure display, choose a DG-06 or DG-08. For programmable output control and integration with a machine controller, choose a DPS digital pressure switch.

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Q: Digital output repeatability is listed as +/-0.2% F.S. +/-1 one digit. What does that mean? Repeatability is +/-0.2% F.S. In psi mode, for example, that translates to +/- 0.29psi. However, the DPS display is only readable to the tenths digit (0.X) after the decimal place and the DPS must round the measured value up or down accordingly.

Actual Pressure Measured Pressure

(+0.2% error) Display (0.2% + 1

digit error)

100.0psi 100.29psi 100.3psi

5.00bar 5.02bar 5.02bar

Q: Why is the voltage analog output range 1-5V? Isn’t 0-10V more common? DPS series switches are designed to operate with an input voltage of 12 to 24VDC. If powered by a 12VDC supply, a 10V analog output signal could be affected by variations in the supply voltage. As such, the analog output is limited to 5V.

Support For application support or information on MFD’s line of high-quality air preparation equipment, pneumatic valves, and actuators, contact MFD in Chicago, IL. Telephone: 877-MEAD-USA (877-632-3872) Email: sales@mead-usa.com Website: www.bimba.com/MFD/