UE ONE Series User manual

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One Series Electronic Pressure
and Temperature Switches
Discrete Input and Loop-Powered
Models: 2W2D, 2W3A, 2W P
External Powered
Models: 4W3A, 8W2D
UNITED ELECTRIC
CONTROLS
Installation and Maintenance
Instructions
Please read all instructional literature carefully and thoroughly before starting. Refer to the final page for the listing of Recommended
Practices, Liabilities and Warranties.
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GENERA
MISUSE OF THIS PRODUCT MAY CAUSE E PLOSION AND PERSONAL INJURY. THESE INSTRUCTIONS MUST BE THOROUGHLY READ AND UNDERSTOOD
BEFORE UNIT IS INSTALLED.
WARNING: E PLOSION HAZARD - SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR USE IN HAZARDOUS LOCATIONS.
WARNING: SEE THE PRODUCT NAMEPLATE INFORMATION FOR SPECIFIC AGENCY CERTIFICATIONS APPLICABLE TO YOUR PRODUCT.
2W2D MODE S
THIS EQUIPMENT IS SUITABLE FOR USE IN CLASS I, DIVISION 2, GROUPS A, B, C AND D; CLASS II, DIVISION 2, GROUPS F AND G; CLASS III; CLASS I, ZONE
2 AEx nC IIC T5; CLASS I, ZONE 2 Ex nC IIC T5; OR CLASS I, DIVISION 1, GROUPS A, B, C AND D; CLASS II, DIVISION 1, GROUPS E, F AND G; CLASS III;
CLASS I, ZONE 0 AEx ia IIC T5; CLASS I, ZONE 0 Ex ia IIC T5; WHEN INSTALLED PER DRAWING #A-62174-19 (NORTH AMERICA); OR NON-HAZARDOUS
LOCATIONS ONLY.
THIS EQUIPMENT IS ATE CERTIFIED SUITABLE FOR APPROPRIATE USE IN GAS ZONE 2 & DUST ZONE 22 APPLICATIONS OR GAS ZONE 0 & DUST ZONE
20 APPLICATIONS WHEN INSTALLED PER DRAWING #A-62174-20 (EUROPE).
0539 DEMKO 03 ATE 0322281 0539 DEMKO 03 ATE 0322281
II 1 G EEx ia IIC T5 II 3 G EEx nL IIC T5
II 1 D T+ 90ºC II 3 D T+ 90ºC
-40ºC TAMB. +85ºC, IP66 -40ºC TAMB. +85ºC, IP66
2W3A MODE S
THIS EQUIPMENT IS SUITABLE FOR USE IN CLASS I, DIVISION 2, GROUPS A, B, C AND D; CLASS II, DIVISION 2, GROUPS F AND G; CLASS III; CLASS I, ZONE
2 AEx nC IIC T5; CLASS I, ZONE 2 Ex nC IIC T5; OR NON-HAZARDOUS LOCATIONS ONLY.
THIS EQUIPMENT IS ATE CERTIFIED SUITABLE FOR APPROPRIATE USE IN GAS ZONE 2 & DUST ZONE 22 APPLICATIONS.
0539 DEMKO 03 ATE 135585
II 3 G EEx nL IIC T5
II 3 D T+ 90ºC
-40ºC ≤ TAMB. ≤ +85ºC, IP66
2W P AND 8W2D* MODE S (* pending approvals)
THIS EQUIPMENT IS SUITABLE FOR USE IN CLASS I, DIVISION 2, GROUPS A, B, C AND D; CLASS II, DIVISION 2, GROUPS F AND G; CLASS III; CLASS I, ZONE
2 AEx nC IIC T4 CLASS I, ZONE 2 Ex nC IIC T4; OR NON-HAZARDOUS LOCATIONS ONLY.
THIS EQUIPMENT IS ATE CERTIFIED SUITABLE FOR APPROPRIATE USE IN GAS ZONE 2 & DUST ZONE 22 APPLICATIONS.
0539 DEMKO 03 ATE 0322281
II 3 G EEx nL IIC T4
II 3 D T+ 130ºC
-40ºC ≤ TAMB. ≤ +80ºC, IP66
4W3A MODE S
THIS EQUIPMENT IS SUITABLE FOR USE IN CLASS I, DIVISION 2, GROUPS A, B, C AND D; CLASS II, DIVISION 2, GROUPS F AND G; CLASS III; CLASS I, ZONE
2 AEx nC IIC T4; CLASS I, ZONE 2 Ex nC IIC T4; OR NON-HAZARDOUS LOCATIONS ONLY.

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MOUNTING
Tools Required
1-1/16" wrench for sensor hex fitting
Screwdriver for mounting bolts
2 mounting bolts (1/4" Max.)
BEFORE INSTALLING, CHECK THE SENSOR MODEL SELECTED FOR COMPATIBILITY TO THE PROCESS MEDIA IN CONTACT WITH THE SENSOR AND WETTED
PARTS.
FOR PRESSURE AND LOCAL TEMPERATURE MODELS ALWAYS HOLD A WRENCH ON THE SENSOR HE WHEN MOUNTING UNIT. DO NOT TIGHTEN BY TURNING
ENCLOSURE, THIS WILL DAMAGE THE CONNECTION BETWEEN THE SENSOR AND HOUSING.
INSTALL UNITS WHERE SHOCK, VIBRATION AND TEMPERATURE FLUCTUATIONS ARE MINIMAL. MOUNT UNIT TO PREVENT MOISTURE FROM ENTERING
ENCLOSURE. USE PROPERLY RATED SEALING FITTINGS FOR ELECTRICAL WIRE ENTRY. DO NOT MOUNT UNIT IN AMBIENT TEMPERATURES E CEEDING
PUBLISHED LIMITS. THIS IS ESPECIALLY CRITICAL FOR LOCAL MOUNT TEMPERATURE UNITS.
IN HIGH SHOCK AND VIBRATION APPLICATIONS, SECURE THE ENCLOSURE AS DETAILED ON THE NE T PAGE. DO NOT MOUNT VIA THE PROCESS
CONNECTION ONLY.
FOR DIFFERENTIAL PRESSURE MODELS (ESPECIALLY LOW RANGE UNITS), CARE SHOULD BE TAKEN TO MOUNT THE SENSOR LEVEL TO MINIMIZE ANY
PRESSURE READING OFFSETS. THE OFFSET COMMAND MAY BE USED TO ZERO THE DISPLAY, SEE PAGE 8 FOR ADDITIONAL INFORMATION.
Electronics Housing
Mount the unit using the two (2) 1/4" clearance holes in the mounting ears. Plumb sensor to the process port. See page 14 for dimensions.
The One Series product may be mounted in any position except with the electrical conduit connection facing up. Ensure the process connection is sealed to the
process port to prevent leakage. Care should be taken to minimize effects of shock and vibration.
PROCESS CONNECTIONS AND SENSOR INSTA ATION
Pressure and Differential Pressure Models
To pipe mount: Thread the pressure connection onto the pressure port, making sure that the mating threads are clean and free of debris. Use a wrench on the
hex pressure connection to tighten. Test for leaks. On Differential Pressure models, the Low (L) side pressure must NOT exceed the high (H) side pressure.
WARNING: NEVER INSERT ANY OBJECT INTO THE PRESSURE SENSOR OPENING. DAMAGE TO THE SENSOR WILL RESULT, AFFECTING ACCURACY.
ocal and Remote Temperature Models
For Remote Sensing (models C, H & R): Route the extension wire to avoid contact with live components. Avoid kinks, or excessive flexing.
For Surface Sensing (models C, H & R): Secure the sensor housing to the pipe or vessel using an adhesive or strapping method suitable for the application.
For Immersion Sensing (models C, H, R & L): Use of a thermowell is highly recommended to aid in maintenance, testing and preservation of the system integrity.
Insert the sensor housing (0.25" diameter) into the well ensuring that the housing bottoms out and will be completely immersed in the media (2.5" min.) Secure
the sensor using an appropriately sized compression fitting (PF73 or equivalent) or union connector (SA6213-348 or equivalent.)
For Local Ambient Sensing (model L): Mount using the mounting ears on the electronics housing. Mount the product to ensure that the sensor housing will not
be damaged and where the measured temperature is representative of the surrounding environment.
For best temperature measurements, the sensor housing must be in full contact with the surface or media being measured. Heat transfer compound may be
used to aid in fully transferring the media temperature to the sensor housing. Locate where the temperature is most representative of the system. Minimum
insertion depth is 2-1/2".
C EANING THE FACEP ATE
One Series models with ATE approvals have a urethane based conductive coating applied to the faceplate perimeter. The cleaning
of this surface should be performed with a damp cloth only. Should the surface exhibit signs of flaking or wear, the product should
be removed from service in hazardous locations where ATE approvals are required.

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WIRING
Tools Required
Phillips-head screwdriver
Small slotted screwdriver
Wire strippers
WARNING: E PLOSION HAZARD - DO NOT REPLACE COMPONENTS UNLESS POWER HAS BEEN SWITCHED OFF OR THE AREA IS KNOWN TO BE NON-
HAZARDOUS.
WARNING: E PLOSION HAZARD - DO NOT DISCONNECT EQUIPMENT UNLESS POWER HAS BEEN SWITCHED OFF OR THE AREA IS KNOWN TO BE NON-
HAZARDOUS
WARNING: TO MAINTAIN ENCLOSURE INTEGRITY FRONT DISPLAY SCREWS ARE TO BE TORQUED AT 4 IN-LBS (0.45 N-m) IN END USE APPLICATION.
WARNING: THE DEVICES SHALL BE PROPERLY GROUNDED IN THE END USE APPLICATION.
WARNING: LEADWIRES MUST BE RATED 75°C MINIMUM COPPER CONDUCTOR ONLY.
WARNING: MODEL 2W2D ACCEPTS 12-30 VDC AS ITS POWER SOURCE, DIRECTLY FROM DIGITAL INPUTS TO PLCS, DCSS AND OTHER LOW-POWER DC LOADS.
THE SWITCHED OUTPUT MA IMUM LOAD RATING IS 40 mA. (THE UNIT MUST NOT BE CONNECTED DIRECTLY TO A POWER SUPPLY WITHOUT AN APPROPRI-
ATE CURRENT LIMITING LOAD SUCH AS THAT PROVIDED BY A PLC/DCS DISCRETE INPUT. OVERLOADING THE S ITCH MAY CAUSE FAILURE.
WARNING: MODEL 2W3A ACCEPTS 90-130 VAC/VDC AS ITS POWER SOURCE, DIRECTLY FROM DISCRETE INPUTS TO PLCS, DCSS AND OTHER LOW-POWER
LOADS. THE SWITCHED OUTPUT MA IMUM LOAD RATING IS 100 mA. THE UNIT MUST NOT BE CONNECTED DIRECTLY TO A POWER SUPPLY WITHOUT
AN APPROPRIATE CURRENT LIMITING LOAD SUCH AS THAT PROVIDED BY A PLC/DCS DISCRETE INPUT. OVERLOADING THE S ITCH MAY CAUSE
FAILURE.
WARNING: MODEL 2WLP IS LOOP-POWERED AND OBTAINS POWER FROM THE 4-20 mA LOOP. THE 2WLP41 SWITCHED OUTPUT MA IMUM LOAD RATING
IS 0.6 A @ 140 VDC OR VAC AND 0.3 A @ 280 VDC OR VAC FOR MODEL 2WLP43. OVERLOADING THE SWITCH MAY CAUSE FAILURE. THE S ITCH MUST
NOT BE CONNECTED DIRECTLY TO A PO ER SUPPLY.
WARNING: FOR INTRINSICALLY-SAFE INSTALLATIONS, PLEASE REFERENCE THE CONTROL DRAWINGS (UE 62174-19 NORTH AMERICA OR 62174-20
EUROPE) FOR INTRINSIC SAFETY ENTITY PARAMETERS AND OTHER NECESSARY INFORMATION. UNIT MUST BE WIRED TO AN APPROVED I.S. BARRIER.
REFER TO PAGE 12 FOR ADDITIONAL INFORMATION ON SELECTING AN INTRINSIC SAFETY BARRIER. SUBSTITUTION OF COMPONENTS MAY IMPAIR
INTRINSIC SAFETY.
WARNING: MODEL 4W3A ACCEPTS 90-130 VAC/VDC AS ITS POWER SOURCE. THE SWITCHED OUTPUT MA IMUM LOAD RATING IS 10 A, 24-280 VAC AT
T(amb) 38°C (100°F). DERATE 1.8 A/10°C (18°F). OVERLOADING THE S ITCH MAY CAUSE FAILURE.
WARNING: THE ONE SERIES 8W2D MODEL ACCEPTS 12-30 VDC AS ITS POWER SOURCE. THE MA IMUM LOAD RATING FOR EACH SWITCH IS SHOWN IN
THE TABLE ON PAGE 5. OVERLOADING THE S ITCH MAY CAUSE FAILURE.
Remove the four (4) Phillips-head screws holding the faceplate to the enclosure. Gently remove the faceplate module. Exercise caution so that the wires going
between the sensor and the faceplate module are not damaged or removed. Locate field wires and strip carefully. Insert field wiring per the diagrams on page 4.
Carefully place the faceplate back on the enclosure and re-attach using the (4) Phillips screws (4 in-lbs or 0.45 N-m). DO NOT OVERTIGHTEN.
Terminal Block and Torque Details
The 2W2D terminal block is marked “+” and “-”, and includes a chassis ground symbol. These markings indicate the polarity of this polarized switch. Polarity
must be observed or the 2W2D will not work, making it necessary to reverse the wiring connections. The 2W2D is reverse polarity protected, so no damage
results from miswiring. The 2W2D terminal block accepts 14-22 AWG wiring and the recommended torque is 7 in-lbs.
The 2W3A terminal block is market “~” and “~”, and includes a chassis ground symbol. The 2W3A is a non-polarized switch, so connections can be made to
either terminal without observing polarity. The 2W3A terminal block accepts 14-22 AWG wiring and the recommended torque is 7 in-lbs.
The 2WLP has two terminal blocks, TB1 and TB2. TB1 has three positions, two marked with a switch symbol and one marked with a chassis ground symbol. TB1
terminal block accepts 14-22 AWG wiring and the recommended torque is 3.48 in-lbs. TB2 has two positions marked “4-20+” and
4-20-”. These markings indicate the polarity of the 4-20 mA analog signal. Polarity must be observed. TB2 terminal block accepts 14-26 AWG wiring and the
recommended torque is 4.38 in-lbs.

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Model 2W2D is intended for direct connection to a 24 VDC PLC or DCS discrete input, or other
suitable load (see page 11). Power is obtained and the switch is provided by the same two-wire
connection. Polarity must be observed. Refer to the Switch Ratings Table for the switch ratings.
Do not connect this model directly to a power supply.
Model 2W3A is intended for direct connection to a 115 VAC or VDC PLC or DCS discrete input,
or other suitable load (see page 11). Power is obtained and the switch is provided by the same
two-wire connection. Refer to the Switch Ratings Table for the switch ratings. Do not connect
this model directly to a power supply.
Model 2W P is loop-powered and is connected directly to an analog input of a PLC or DCS via
TB2 providing a 4-20 mA analog signal (see page 11). Polarity must be observed. The auxiliary
solid-state relay is connected via TB1. Refer to the Switch Ratings Table for the switch ratings.
Model 4W3A requires a 90-130 VAC @ 15 mA external power supply. Connect the leads from
the power supply to TB1 L1 and L2 terminals. Connect the potential-free solid-state relay at TB1
to an appropriate load. Refer to the Switch Ratings Table for the switch ratings.
The 4W3A has one terminal block labeled TB1. TB1 has four positions, marked with “L1”, “L2” and a switch symbol covering the remaining two positions. TB1
terminal block accepts 14-22 AWG wiring and the recommended torque is 3.5 in-lbs.
The 8W2D has three terminal blocks, one located on the back of the display module and two, labeled TB1 and TB2, located on circuit board permanently mounted
inside the enclosure. The display module terminal block accepts 14-22 AWG wiring and the recommended torque is 7 in-lbs. TB1 has two positions marked “4-
20+” and 4-20-”. These markings indicate the polarity of the 4-20 mA analog signal. Polarity must be observed. TB1 terminal block accepts 14-26 AWG wiring
and the recommended torque is 4.38 in-lbs. TB2 has five positions, four marked with a switch symbol and one marked with a chassis ground symbol. TB2 terminal
block accepts 14-22 AWG wiring and the recommended torque is 3.48 in-lbs.
NOTE: The sensor wiring harness must be connected to the module with the red wire oriented to the arrow on the label. Reversing this connector will result in
measurement errors or failure.
WIRING DIAGRAMS

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Model 8W2D requires a 12-30 VDC @ 30 mA external power supply. Connect the leads from the
power supply to the + and - terminals on the back of the 8W display module, observing polarity.
Connect the 4-20 mA output available at TB1 to an appropriate analog input, observing polarity.
Connect the two potential-free solid-state relays at TB2 to appropriate loads. Refer to the Switch
Ratings Table for SW1 & SW2 ratings.
Switch Ratings Table
Model Number SW1 SW2
2W2D00 12-30 VDC @ 40 mA N/A
2W3A00 90-130 VAC/VDC @ 100 mA N/A
2W P41 0-140 VAC/VDC @ 0.6 A 1N/A
2W P43 0-280 VAC/VDC @ 0.3 A 1N/A
4W3A01 24-280 VAC @ 10 A 2N/A
8W2D42 75-250 VAC @ 1.5 A 375-250 VAC @ 1.5 A 3
8W2D44 75-250 VAC @ 1.5 A 30-140 VAC/VDC @ 0.6 A 1
8W2D45 0-140 VAC/VDC @ 0.6 A 10-140 VAC/VDC @ 0.6 A 1
arning: Exceeding the current or voltage ratings could damage the One Series
1 Derate at 8% per 10°C (18°F)
2 Derate at 1.8 A per 10°C (18°F) for temperature above 100°F (38°C)
3 Derate at 10% per 10°C (18°F) (Subject to change)
THEORY OF OPERATION
The One Series electronic switch product line is based on an all-solid-state electronic module that incorporates a microprocessor. The combination of features
such as no moving parts and IAW® self-diagnostics provide a highly reliable, accurate and repeatable monitor for detecting pressure and temperature thresholds
and, once reached, can make intelligent switch decisions based on retained settings and current conditions. Where a mechanical device has no way of determin-
ing its “readiness”, the One Series monitors its own health and reports it locally. This IAW® (I Am Working) feature provides a solution to the “blind device” issue
common with mechanical apparatus. You will always know the health status of the One Series.
The One Series is also very rugged, featuring a Enclosure Type 4 , weather-tight enclosure suitable for harsh environments and hazardous (Class I, Division 2)
locations. The 0.5% accuracy rating is maintained over a very wide -40°C - (+70°C) operating range using active temperature compensation. Repeatability
rivals that of a process transmitter, with a 0.1% of full range rating. The set point and deadband (hysteresis) of the switch is fully programmable over the entire
range of the sensor. Reaction time for the One Series to a process change is typically 50 mS or less.
2-WIRE SIMP ICITY (2 Models only)
The One Series 2-Wire electronic pressure switch (patented) is designed to operate on discrete input leakage current (models 2W2D and 2W3A) or analog input
4-20 mA loop power (models 2WLP41 and 2WLP43). The microprocessor-based One Series 2-Wire is the only electronic switch to operate and switch over a
single pair of wires, similar to a traditional mechanical switch or 4-20 mA process transmitter. It combines the simplicity and low cost features of a switch and
the reliability features of a transmitter, at less than half the price of the transmitter, and without the need to pull additional wiring.
• Model 2W2D00 is designed to work with most 24 VDC discrete Programmable Logic Controller (PLC) or Distributed Control System (DCS) inputs and some
relays. When open, the switch draws 350 µA; when closed the switch sinks or sources 40 mA maximum @ 12-30 VDC.
• Model 2W3A00 is designed to work with most 115 VAC discrete PLC or DCS inputs and some relays. When open, the switch draws 1 mA; when closed, the
switch sinks or sources 100 mA maximum @ 90-130 VAC or VDC.
• Model 2WLP4x is loop-powered and operates in a transmitter loop attached to an analog PLC or DCS input and provides a field-scalable 4-20 mA signal over
a 2-wire connection. Model 2WLP41 contains an auxiliary solid-state relay switch rated for 0.6 A @ 140 VAC or VDC maximum and requires 2 additional
wires, if used. Model 2WLP43 is rated for 0.3 A @ 280 VAC or VDC.
DISP AY
The One Series features a large, easy-to-read display, showing the process condition and the status of the instrument. (See Display Features for a complete
description.) Set point, deadband and minimum/maximum process values can be easily accessed from the front of the unit while in operation. Programming and
interrogating the One Series is done through two buttons on the faceplate.
HIGH-POWER AND DUA SWITCHING
One Series model 4W3A incorporates a relay to provide a high-capacity switch rating of 280 VAC at up to 10 A. One Series model 8W2D provides 2 independent
relays (see table on page 5 for details) and includes a field-scalable 4-20 mA analog output that is proportional to the process variable. These One Series
Models require a separate power supply.

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I Am Working (IAW®)
The One Series also contains UE’s patented IAW® diagnostic software. On a continuous basis, the One Series is checking itself for proper operation, and letting
you know locally that things are OK using animated arrows on the display. For remote assurance, the output can be set up for 3-state operation, allowing the
host device to detect normal, tripped, and fault conditions (see Key Programming Features, page 7 for a full description of the 3-state operation). IAW® watches
over many possible problems, both within itself and in the overall system (a list of the various parameters is outlined in the chart under Fault Codes, page 10).
In the event of a fault condition, the One Series will attempt to display the problem and provide remote electrical indication. In the case of certain micro-controller
faults, the revolving arrow may freeze or go out, indicating that a failure exists.
OTHER FEATURES
The One Series has other advanced features:
• When the Plugged Port feature is enabled, the One Series will watch for process conditions which could be evidence of a plugged sensing port or
an accidentally-closed instrument valve, and alert the user to potential problems.
• The switch output can be configured for either automatic reset or latching, requiring the user to manually acknowledge the alarm.
• User selectable switch response time (delay) filter allows for dampening the One Series response to process upsets or spikes, eliminating nuisance trips.
(See Key Programming Features, page 7 for a complete description of these features).
DISP AY FEATURES AND DIAGNOSTICS
The One Series features a large, easy to read LCD display. It is used for three main purposes: process indication, programming of key
features and switch status/troubleshooting.
In the Process Display mode, the display may be indicating the following:
• Current process value and units of measure: A value will be displayed as long as the reading is within 110% of the full scale range noted on the nameplate.
The units of measure are factory-set.
• I Am Working (IAW®) status: When the unit and process are working properly a circular 4-segment arrow will be revolving around the letters “IAW” in the
top center of the display. (For a full description of IAW®, see above).
• Offset/Span Adjustment: The word “offset” will appear above the process value, indicating that the offset and/or span calibration has been modified by the
user (see Key Programming Features, for a description of Offset and Span). In addition, the user can easily access information such as the set point, dead
band and minimum/maximum process readings.
• By pushing the right button once, the display will scroll as follows:
SP1 . DB1 . SP2 . DB2 . (8W2D model only)
• By pushing the left button once, the display will scroll the min/max process values seen:
MA . MIN .
The display will revert back to the Process Display mode after scrolling.
A ARM CONDITION
When the process goes beyond the set point, the display will begin to flash, alternating between the process value and “SW1”. The display will continue to flash
until the process has returned to a value beyond the deadband, at which point the display will revert to normal operation and process value display. If the unit
was programmed to have a latching output, a small “Latch” icon will light in the display when the set point is reached, indicating that the output is latched and
needs to be manually reset. (See Key Programming Features, for a complete description).
FAU T CONDITIONS
In the case of a fault condition, the display may indicate the following:
If the IAW® software detects a fault outside of the micro-controller, and can still operate, it will display an error message.
If the fault is one which affects the micro-controller or the display, the revolving arrow around “IAW” will either freeze or go out.
If it is a failure of the power supply or the wiring, the display will go blank.
(See Fault Codes, page 10 for a complete description of fault diagnostics.)
PROGRAMMING
Tools Required
Software Flowchart, page 13
Step 1: Prior to Programming
Programming of the One Series is done using the two buttons on the faceplate (labeled and ). By stepping down through the main menu using the
left button, you can access the various features of the One Series. The right button is then used to move into the feature’s submenu for setting up or
modifying the parameters.
NOTE: See the flowchart on page 13 showing the entire program menu structure.
Important Note: The One Series programming menu is a single direction loop, with submenus embedded in it. Because the main menu is single direction, there
is no way to reverse direction and back up in the program. If you need to make a correction to a prior Main Menu step, you will need to continue forward and exit,
then re-enter the program and step through to the appropriate feature. If you are in a Submenu, you will need to circle back to the beginning of the Submenu
and re-enter the Submenu.
The One Series has a number of advanced features you will need to understand before you can effectively use them. These features are discussed on next page.

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NOTE: For safety and security purposes, the One Series will automatically exit the Programming Mode and return to Process Display Mode if it does not detect a
key stroke after 2 minutes. If this time-out occurs, all setting parameters will revert back to those in memory before reprogramming was initiated.
Step 2: Entering the Programming Mode
The One Series achieves tamper-resistance using a specific key sequence in order to make program changes. In order to enter the Programming Mode:
• Press the and buttons simultaneously (the display will read "SW1");
You are now in the Programming Mode.
Use the Flowchart on page 13 as a guide as you step through the various commands in the Programming Mode. In general, the button is used for two (2)
purposes - to move down through the Programming Mode, and to toggle or increment values in the Submenus. The button is used to move through the
Submenus, and to accept changes.
Step 3: Exiting the Programming Mode
When any of the program commands are displayed, it is possible to exit the Programming Mode by pressing both buttons simultaneously. For example,
you may simply want to make a change to the Switch Mode without accessing any other commands. After changing the Switch Mode, (SP1 is now displayed),
press both buttons and the display will show SAVE CHNG, providing an opportunity to Save or Discard the changes made to the Switch Mode. This ability
to exit the programming mode and save or discard changes occurs whenever a program command is displayed.
NOTE: If two minutes elapses without a key being pressed, the program will automatically exit the Programming Mode and discard any changes that were made,
reverting back to the previously saved settings and the Process Display mode.
Whenever the Programming Mode is entered and changes have been made to any of the program settings, a choice must be made whether to Save or Discard
the changes. At any program command prompt, press both keys to display SAVE CHNG, then:
• to Save changes, press the right button . NO (the default) will be displayed. Press the left button to toggle and display YES. Then press both
buttons to confirm, save the changes and return to the Process Display mode.
• to Discard changes, press the right button . NO will be displayed. Press both buttons to confirm, discard the changes and return to the
Process Display mode.
KEY PROGRAMMING FEATURES
SWITCH MODE:
The One Series allows the switch output to be set up for either 3-state (I Am Working) or 2-state operation. For an overview of the I Am Working (IAW®) function,
see page 6.
2-state switch modes: (DEFAULT)
2-state operation is very similar to that of a SPST snap-action switch. The output either
opens or closes when a threshold is passed. The One Series has four possible 2-state
choices:
• Open on Rise (“OPEN RISE”) *
• Open on Fall (“OPEN FALL”) *
• Close on Rise (“CLOS RISE”) *
• Close on Fall (“CLOS FALL”) *
3-state switch modes: (Models 2W2D, 2W3A, 2WLP and 4W3A only)
The 3-state modes take full advantage of the diagnostic capability of the One Series by
utilizing the switch to send a remote signal. There are two possible mode choices:
• Pulse on Rise (“PULS RISE”)
• Pulse on Fall (“PULS FALL”)
In 3-state operation, the output will be closed (ON-state) for normal, inside threshold
operation. If the set point is exceeded, the output will pulse between closed and open.
It will change to continuously open to indicate a failure (power out, open wire condition
or IAW® diagnostic fault condition). This feature provides the user with important diagnostic information. These modes should be chosen whenever the host is
capable of being programmed to detect a pulse waveform. Two pulse widths are available. (See page 13 item 5 for the Pulse Rates.) (See page 12 for Ladder
Logic example.)
* NOTE: The 2-state control modes have a normally open switch as a valid condition. The self-diagnostic settings (IAW® and Plugged Port) indicate problems
remotely using the same open switch signal. As a result, faults will only be indicated locally on the LCD. Remote diagnostics are not possible when these control
modes are selected. Opening the contacts on a trip or fault condition should be chosen whenever possible, as this is inherently the better “fail safe” choice (i.e.,
alarm, power loss or IAW® diagnostic condition). The 2-state modes should also be chosen whenever switching a relay (since relay life would be diminished when
over-cycled by the 3-state pulse) or when the host cannot interpret either of the cycle times of the 3-state pulse waveform.

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IMPORTANT NOTE: 3-state switch (pulsed) modes must not be used when the switch output is connected directly to a load that could be damaged by being
switched at the pulse frequency. For these types of loads, use a 2-state mode.
SET POINT:
The set point is the value at which the One Series changes the state of the output. It is fully adjustable throughout the operating range of the unit (noted on the
nameplate). Model 8W2D has two independent set points, one for each switch output.
DEADBAND:
Deadband is the amount above or below the set point at which the One Series changes the output state back to normal operation. In rising modes of operation
the deadband must be less than the set point. In falling modes of operation the deadband must be less than the operating range of the unit minus the set point.
In the One Series menu, the deadband is represented as a value which is added or subtracted from set point, depending on control mode (e.g., if the Control Mode
is “Open on Rise” and the set point is set at 100 psi with a deadband of 10, the output will open as the pressure rises through 100 psi and close as the pressure
falls through 90 psi. If the Control Mode is changed to “Open on Fall”, the output would open as the pressure falls through 100 psi and close as the pressure
rises through 110 psi). The deadband should be set wide enough so that frequent cycling or chatter does not occur, but narrow enough to satisfy conditions for
normal process operation. Model 8W2D has two independent deadband settings, one for each switch output.
Mode is changed to “Open on Fall”, the output would open as the pressure falls through 100 psi and close as the pressure rises through 110 psi). The deadband
should be set wide enough so that frequent cycling or chatter does not occur, but narrow enough to satisfy conditions for normal process operation. Model 8W2D
has two independent deadband settings, one for each switch output.
ADVANCED FEATURES
NOTE: No initial programming of these features is required. The default for these advanced commands is zero or off.
MINIMUM & MAXIMUM READINGS:
The One Series continuously captures the readings from the sensor and stores the minimum and maximum values since the last time they were reset. These can
be viewed at any time by pushing the left button. The display will scroll the information and then return to the Process Display mode. To reset these values,
enter the Programming Mode (see page 6), use the left button to get to the CLR MA /MIN command and press the right button two times. After exiting
the Programming Mode and saving the changes (see page 6), the values will be reset to the current reading and begin cumulative recording again.
OFFSET:
The One Series is factory calibrated to 0.5% of range at room temperature. In some applications it may be necessary to re-calibrate the unit in the field. Offset
allows the user to enter a positive ("POS") or negative ("NEG") offset to the pressure readings. An offset of up to +/- 10% of the range is allowed.
NOTE: Any numerical value entered other than 0.00 will cause the display to indicate “Offset” just above the process reading in the process display.
WARNING: USE OF THIS OPTION MAY CREATE A CONDITION WHERE THE DISPLAY MAY INDICATE “0.00” WHEN SIGNIFICANT PRESSURE (10% OF RANGE)
E ISTS IN THE SYSTEM. INDEPENDENT VERIFICATION OF THE SYSTEM PRESSURE SHOULD BE DONE PRIOR TO MAINTENANCE ON THE SYSTEM IF
“OFFSET” APPEARS ON THE PROCESS DISPLAY.
SPAN:
The SPAN adjustment allows the user to shift the slope of the calibration curve by +/- 10%.
To adjust Span a reference pressure near full scale should be applied to the unit. The display value and the reference pressure should be noted.
To calculate the number to enter for Span divide the reference pressure by the display reading, then multiply by the full scale pressure range of the One Series.
Span value=(Reference Pressure / Display Reading) x Full Scale Pressure Range of the One Series.
Example: One Series 100 psi range
Reference Pressure = 100 psi
Display Reading = 98 psi
100 x 100 = 102 (Enter this number for Span)
98
NOTE: Span is limited to +/- 10% of the full scale range. Entering a “0” will disable the feature.
WARNING: USE OF THIS OPTION MAY “DE-CALIBRATE” THE UNIT TO SUCH A CONDITION THAT THE PROCESS DISPLAY MAY INDICATE “0.00” WHEN
SIGNIFICANT PRESSURE IS ACTUALLY PRESENT IN THE SYSTEM. INDEPENDENT VERIFICATION OF THE SYSTEM PRESSURE SHOULD BE DONE PRIOR TO
MAINTENANCE ON THE SYSTEM IF “OFFSET” APPEARS ON THE DISPLAY.

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ATCH MODE: (N/A on Model 8W2D)
The switch output can be configured to latch when the set point is reached.
• Latching Mode: In the Programming Mode, set “LCH1” to “ON”. The output changes to the switched state when the set-point is crossed, and will remain in
the switched state until it is manually reset by the user.
• To clear a Latched Output: Display will be reading "MAN RSET". To clear and exit, press both buttons .
• To return to the Process Display, without clearing, press the right button .
• To continue programming without clearing, press the left button .
.
P UGGED PORT:
The One Series has the ability to detect process conditions which may indicate that the process port has become blocked, plugged or put into a “bypass” condition.
It does this by dynamically monitoring pressure changes over time. If the process does not change by a certain amount during the time period selected (both set
by the user), the display will indicate “PLUG” and the output will go to the “open” state.
There are four possible settings for the detection time:
• OFF • 1 Min. • 1 Hr. • 24 Hrs.
Setting the detection time to “OFF” disables the plugged port function. This should be done where danger of plugging is not a concern, or where the system
pressures may not change over time (e.g., a storage tank). If the feature is enabled the user must then enter the plugged port range. This number represents
the expected variation in the process variable. The number is limited to +/- 10% of the full scale range of the sensor. The diagram below illustrates the feature’s
operation.
T0 Process variable ramp up
T1 Process variable stabilizes, new thresholds calculated
T2 Threshold exceeded, new thresholds calculated, timer reset
T3 Low threshold exceeded, new thresholds calculated, timer reset
T4 Plugged Port timer expires, Plugged port condition reported
T5 Plugged Port condition cleared, new thresholds calculated, timer reset
T6 Low threshold exceeded, new thresholds calculated, timer reset
T0 T
1 T 2 T 3 T 4 T 5 T 6
DE AY:
In some applications, it is desirable to “dampen” the switch response and prevent intermittent false trips due to pressure spikes or other transient/isolated events.
The Delay feature provides a software digital filter with a programmable time constant for suppressing certain transient short-duration events. The filter settings
are:
• OFF • ¼ second • ½ second • 1 second • 2 seconds
NOTE: The One Series typically responds to a process change in under 50 mSec. Using the Delay feature can lengthen the overall response time of the switch for
certain types of pressure changes.
• A shorter delay setting provides a faster response but is less stable.
• A longer delay setting provides a slower response and is more stable.
During a plugged port fault (the interval from T4 to T5) the
display will read “PLUG” and the switch will be set in the
“OPEN” state. The fault will be cleared if the pressure
varies outside of the detection range or if the feature is
disabled by the user.

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SCA E: (2WLP and 8W2D models only)
The 4-20 mA output on model 2WLP and 8W2D is field scalable. The default setting is 100% of sensor range, where 4 mA
represents 0 and 20 mA is full range scale. If desired, both the 4 mA and 20 mA levels may be set independently to adjust
the portion of the sensor's range represented by the 4-20 mA output.
Enter the Programming Mode (see page 6) and push the left button repeatedly until you reach the 4 mA command.
Press the right button and select POS or NEG. Press the right button and enter the new sensor value that will be
represented by 4 mA. This value must be between -3% and 25% of the sensor's range. Press the right button after
entering the value. Press the left button to reach the 20 mA command. Press the right button and select POS or
NEG. Press the right button and enter the new sensor value that will be represented by 20 mA. This value must be
between 50% and 110% of the sensor's range. Press the right button after entering the value. Exit the Programming
Mode (see page 7).
NOTE: Analog values between 4 and 20 mA are recalculated for the new lower and upper sensor values entered using the
4 mA and 20 mA commands, providing a scaled proportional output that covers a modified portion of the sensor's range.
Scaling the 4-20 mA output over a smaller portion of the sensor's range does not increase the accuracy of the propor-
tional output.
FAU T CODES
Patented IAW® diagnostics are capable of detecting many possible fault conditions. Some fault conditions will clear automatically when the parameter returns
to normal; others require the unit to be powered down and restarted; and some are catastrophic and require repair or replacement. A list of fault conditions is
shown below:
DISP AY WI SCRO : FAU T: RESU T: SWITCH
OUTPUT:
4-20 mA
OUTPUT:
PLUG Plugged Port Detected Return to normal when condition clears Open 24 mA
UNDER RANGE Sensor Under Range Return to normal when condition clears As Programmed 3.5 mA (min)
OVER RANGE Sensor Over Range Return to normal when condition clears As Programmed 22.0 mA (max)
E TREME OVER RANGE Sensor Over Range Return to normal when condition clears As Programmed 24 mA
SENSOR FAULT Open Sensor Recovery on power reset likely if fault does not re-occur Open 24 mA
SENSOR FAULT Shorted Sensor Recovery on power reset likely if fault does not re-occur Open 24 mA
REF. FAULT Reference Voltage Recovery on power reset likely if fault does not re-occur Open 24 mA
P/S OUT OF RANGE Power Supply Recovery on power reset likely if fault does not re-occur Open 24 mA
SWITCH FAULT Switch Voltage Recovery on power reset likely if fault does not re-occur Open 24 mA
KEYPAD ERROR Keypad Shorted Recovery on power reset likely if fault does not re-occur Open 24 mA
WDOG Watch Dog Timer Recovery on power reset likely if fault does not re-occur Open 24 mA
EEPROM CS ERROR EEPROM Checksum error Recovery on power reset likely if fault does not re-occur Open 24 mA
NOTE: The 4-20 mA output may reach 22 mA in an over range condition. 24 mA output is intended to indicate a fault.

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ACCEPTAB E SUPP Y VO TAGES AND OADS FOR 2W MODE S
The charts below provide a range of acceptable power supply voltages (in Volts) and series loads (in Ohms). This is useful when the One Series 2-Wire is con-
nected to non-standard PLC and DCS inputs or is connected in series with a relay or solenoid coil. For the 2W2D models a maximum of 30 VDC supply voltage
and a load of 40 mA must not be exceeded. For the 2W3A models a maximum of 130 VAC/VDC supply voltage and a load of 100 mA must not be exceeded.
Permanent damage to the One Series 2-Wire electronics may result if the supply voltages are exceeded.
NOTE: If you need assistance with determining the compatibility of the One Series 2-Wire with your PLC, DCS, or relay, we can help. Please have the manufacturer's
model number ready when you call us. In rare cases, when the series resistor value is too large and falls out of the Acceptable Range, placing another resistor
across the input will allow it to work. Please call [phone] (Technical Sales) for assistance.
Please note that a maximum of 30 VDC supply voltage and a load
of 40 mA must not be exceeded or permanent damage to the One
Series 2-Wire electronics may result.
Please note that a maximum of 130 VAC/VDC supply voltage and a
load of 100 mA must not be exceeded or permanent damage to the
One Series 2-Wire electronics may result.
2WLP
0
200
400
600
800
1000
1200
10 12 14 16 18 20 22 24 26 28 30 32 34 36
Vin
Ohms
Please note that Model 2WLP obtains loop-power from a 4-20 mA
input. The chart at left shows the maximum load resistance allowed
at various voltages. Typically, this resistance is provided internally
by the PLC or DCS. No external resistor is required.

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ADDER OGIC EXAMP E
(used for detecting the pulsed output)
Ladder logic for One Series 2-wire model 2W2D
Pulse-on-rise output (25 mSec)
SE ECTING AN INTRINSIC SAFETY BARRIER (Model 2 2D only)
WARNING: INSTALLATION OF INTRINSICALLY SAFE CIRCUITS MUST BE PERFORMED IN ACCORDANCE WITH THE REQUIREMENTS OF THE GOVERNMENT
AND/OR OTHER LOCAL AUTHORITY HAVING JURISDICTION. SYSTEM COMPONENTS AND INSTALLATION METHODS MUST BE APPROVED BY THE APPROPRI-
ATE RECOGNIZED APPROVAL AUTHORITY.
The information provided below is for reference only and is intended to act as a guide in the selection of a suitable I.S. Barrier. Please reference one of the
following I.S. control drawings for installation details and device entity parameters:
A-62174-19 (North American, Class, Division & Zone based installations)
A-62174-20 (European, Class, Zone based installations)
There are two general types of Intrinsic Safety Barriers, shunt diode (passive) safety barriers and transformer isolated barriers. Shunt diode safety barriers are
the simplest and least expensive type of I.S. interface for protecting circuits in hazardous areas. Diode safety barriers must be installed with a suitable (<1Ω)
earth ground. Isolated barriers offer simplified installation, since there is no requirement for the ground, but are generally more expensive than the diode safety
barriers.
Shunt Diode Safety Barriers:
The entity parameters of diode safety barriers suitable for use with the 2W2D models are:
V max = 28 Volts
I max = 93 mA
Because the 2W2D model derives its operating power from the input of the host device to which it is connected it is also important to select a barrier with a low
leakage current. This is typically specified as Vwkg, the working voltage , at which 10 uA of leakage current will occur.
V
wkg > 25 Volts; at 10 uA of leakage current is ideal
Suggested Sources:
Pepperl + Fuchs® Model No. Z787 MTL® Model No. 7087+
Transformer Isolated Barriers:
Due to the unique method by which the model 2W2D operates, a specifically designed isolated barrier must be used:
(Contact United Electric Controls for pricing and availability: [phone] Tech. Sales)
The isolated barrier is available from UE, your distributor, or MT : (Choose One)
• Order UE Part Number 62169-29 for the Barrier packaged separately from UE or your distributor, or
• Order Option Code M036 for the Barrier packed with the 2W2D model from UE or your distributor, or
• Order Part Number MTL 5012S directly from MTL or any of its distributors.

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PROCESS DISP AY

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Models 8W2D and 2W P
(Dual Conduit shown with Temperature Sensor)
Models 4W3A, 2W2D and 2W3A
(Single Conduit shown with Gauge Pressure Sensor)
DIMENSIONA DRAWINGS

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Temperature Model
Temperature Model R
SENSOR OPTIONS
Gauge Pressure
1/2" NPT (female)
Temperature Models H & C
Differential Pressure

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UNITED ELECTRIC
CONTROLS
180 Dexter Ave. P.O. Box 9143, Watertown, MA 02472-9143 USA
617 926-1000 Fax [phone]
www.ueonline.com
RECOMMENDED PRACTICES AND WARNINGS
United Electric Controls Company recommends careful consideration of the following
factors when specifying and installing UE pressure and temperature units. Before
installing a unit, the Installation and Maintenance instructions provided with unit must
be read and understood.
• To avoid damaging unit, proof pressure and maximum temperature limits stated in
literature and on nameplates must never be exceeded, even by surges in the sys-
tem. Operation of the unit up to maximum pressure or temperature is acceptable on
a limited basis (e.g., start-up, testing) but continuous operation must be restricted
to the designated adjustable range. Excessive cycling at maximum pressure or
temperature limits could reduce sensor life.
• A back-up unit is necessary for applications where damage to a primary unit
could endanger life, limb or property. A high or low limit switch is necessary for
applications where a dangerous runaway condition could result.
• The adjustable range must be selected so that incorrect, inadvertent or mali-
cious setting at any range point cannot result in an unsafe system condition.
• Install unit where shock, vibration and ambient temperature fluctuations will not
damage unit or affect operation. When applicable, orient unit so that moisture
does not enter the enclosure via the electrical connection. When appropriate, this
entry point should be sealed to prevent moisture entry.
• Unit must not be altered or modified after shipment. Consult UE if modification is
necessary.
• Monitor operation to observe warning signs of possible damage to unit, such as
drift in set point or faulty display. Check unit immediately.
• Preventative maintenance and periodic testing is necessary for critical applica-
tions where damage could endanger property or personnel.
• Electrical ratings stated in literature and on nameplate must not be exceeded.
Overload on a switch can cause damage, even on the first cycle. Wire unit
according to local and national electrical codes, using wire size recommended in
installation sheet.
• Do not mount unit in ambient temp. exceeding published limits.
IMITED WARRANTY
Seller warrants that the product hereby purchased is, upon delivery, free from defects
in material and workmanship and that any such product which is found to be defec-
tive in such workmanship or material will be repaired or replaced by Seller (Ex-works,
Factory, Watertown, Massachusetts. INCOTERMS); provided, however, that this warranty
applies only to equipment found to be so defective within a period of 36 months from
the date of manufacture by the Seller. Seller shall not be obligated under this warranty
for alleged defects which examination discloses are due to tampering, misuse, neglect,
improper storage, and in any case where products are disassembled by anyone other
than authorized Seller’s representatives. E CEPT FOR THE LIMITED WARRANTY OF
REPAIR AND REPLACEMENT STATED ABOVE, SELLER DISCLAIMS ALL WARRANTIES
WHATSOEVER WITH RESPECT TO THE PRODUCT, INCLUDING ALL IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
IMITATION OF SE ER’S IABI ITY
Seller’s liability to Buyer for any loss or claim, including liability incurred in connection
with (i) breach of any warranty whatsoever, expressed or implied, (ii) a breach of
contract, (iii) a negligent act or acts (or negligent failure to act) committed by Seller,
or (iv) an act for which strict liability will be inputted to seller, is limited to the “limited
warranty” of repair and/or replacement as so stated in our warranty of product. In no
event shall the Seller be liable for any special, indirect, consequential or other damages
of a like general nature, including, without limitation, loss of profits or production, or
loss or expenses of any nature incurred by the buyer or any third party.
UE specifications subject to change without notice.
UE2501105