Bimba MFD User manual

Digital Pressure Switch
User Guide
USER GUIDE

2
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

3
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.

4
Engineering Specifications
Accessories
Panel Adapter and Cover:
DPS-PA
5m Data Cable: DPS-C5M

5
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

6
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

7
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

8
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

9
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
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

12
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 andGood. 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

13
Advanced Settings
Setting ID
Setting Options
Measurement
Mode
>5s
System
Hysteresis
3 45 …
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

14
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.

15
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: [e-mail]
Website: www.bimba.com/MFD/