United Electric Controls ONE Series User manual

Pressure
Differential Pressure
Temperature
Installation and Maintenance Instructions
IM1-03

Table of Contents
Product Description 3
Sensor Types 4
Product Labeling 5
Mounting 5
Wiring 7
Theory of Operation
Setting of User Parameters 4
Troubleshooting 7
Frequently Asked Questions 22
Dimensional Drawings 24
Connections for Power Supply,
IAW Output, and Solid State Relay 26

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One Series Electronic Pressure, Differential Pressure & Temperature Switches are designed for
critical alarm and shutdown applications in harsh, hazardous environments. One Series electronic
switches measure the process variable and provide local alarm or shutdown actuation. The uni ue
IAW (I Am Working) circuit provides the local and remote indication of the output status and the
"health" of the product. An internal solid-state switching device allows for long switch life with no
arcing or contact wear, providing years of reliable operation. The local process and status
indication, as well as a proprietary remote status signal, provide a clear indication that the One
Series product is functioning properly.
Low level (open drain) DC output(s) may be used to trigger control circuits or a discrete input to
a process computer. The switch output may be configured for normally open or normally closed
operation by the user in the field by keypad programming and without re-wiring.
A 15 Amp 280 VAC solid-state relay option provides local high level switching for actuation or
shutdown of your system. An optional 4 to 20 mA analog output allows remote monitoring and
trending of the process variable. The self-contained, compact package allows for easy retrofit of
traditional switches or transmitters.
A 115 VAC input/output option enables the One Series to be powered by an AC source and switch
AC loads. Designed for Division 2 hazardous locations and harsh environmental conditions, this
rugged design will stand up to your most demanding applications.
The One Series is simple to use. Below are three easy steps to mount, wire and
configure your product:
1. Mount the One Series using the process connection or two mounting ears.
2. Wire the One Series using the convenient conduit connection. Color coded lead wires
or optional terminal block allow field connections to be made uickly.
3. Configure the One Series using the simple four key keypad and helpful display prompts.
Remove cover, choose an operating mode, set point and deadband. Replace cover.
PART NUMBERS BEGINNING IN "D1D" INCLUDE AN INTEGRAL UPPER HOUSING CONTAINING
115 VAC POWER SUPPLY, 5A SOLID-STATE RELAY AND HIGH- AND LOW- POWER TERMINAL
BLOCKS. OPTION CODE M028 DENOTES 230 VAC. MAXIMUM ELECTRICAL RATINGS, AS NOTED ON
THE PRODUCT NAMEPLATE, SHOULD NOT BE EXCEEDED. TERMINAL BLOCKS ACCEPT 20 TO 14 AWG.
THIS PRODUCT MAY INCLUDE BOTH 115/230 VAC AND 24 VDC CIRCUITS. DISCONNECT ALL
SUPPLY CIRCUITS BEFORE WIRING UNIT. WIRE UNIT ACCORDING TO NATIONAL AND LOCAL
ELECTRICAL CODES. MAXIMUM RECOMMENDED WIRE SIZE IS 14 AWG. ELECTRICAL RATINGS
STATED IN LITERATURE AND ON NAMEPLATES MUST NOT BE EXCEEDED. OVERLOAD ON A SWITCH
CAN CAUSE FAILURE.
Product Description
Please read all instructional literature carefully and thoroughly before starting.
Refer to the final page for the listing of Recommended Practices, Liabilities,
and Warrantees.

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TTyyppee 11 -- PPrreessssuurree::1/2 Female, 316 stainless steel pressure
connection, piezo-resistive strain gauge ceramic sensor
(96% alumina), Viton o-ring standard, other o-ring materials
optionally available
TTyyppee 22 -- TTeemmppeerraattuurree::0.25 OD 304 stainless steel sensor
housing (models L, H, R), mineral insulation (model H) or
Teflon coated leads with metal over-braid (model R). If a
threaded connection is re uired, order PF73 compression
fitting (model L) or SA6213-384 union connection (models H, R).
TTyyppee 33 -- DDiiffffeerreennttiiaall PPrreessssuurree ((DDrryy)): 1/4 -18 NPT Female,
aluminum, glass, plastic, 2 ports 180oopposing, clean air or,
inert gas only (optional plastic barb fittings available)
TTyyppee 44 -- DDiiffffeerreennttiiaall PPrreessssuurree WWeett: 1/4 - 18 NPT female, 2
ports 180oopposing, 316 stainless steel wetted parts
Sensor Types
Model H & R Model L

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Product Labeling
Before installing, verify that you have the proper configuration for your application. The name-
plate on the side of the unit will give you key specifications (see the One Series Bulletin for
complete specifications.)
Your Part Number
located here
The Part Number
is modular. An example
of typical breakdown is:
One Power & Sensor Aux.
Series Output info. info. Output
D1 C 1 H1 O N
Tools Required
11/16" wrench for sensor hex fitting
Screwdriver for mounting bolts
2 mounting bolts (1/4" Max.)
FOR PRESSURE AND LOCAL TEMPERATURE MODELS ALWAYS HOLD A WRENCH ON THE
SENSOR HEX 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. ORIENT UNIT TO PREVENT MOISTURE FROM ENTERING ENCLOSURE. USE
PROPERLY RATED SEALING FITTINGS FOR ELECTRICAL WIRE ENTRY. DO NOT MOUNT UNIT IN
AMBIENT TEMPERATURES EXCEEDING PUBLISHED LIMITS. THIS IS ESPECIALLY CRITICAL FOR
LOCAL MOUNT TEMPERATURE UNITS.
Mounting

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IN HIGH SHOCK AND VIBRATION APPLICATIONS, SECURE THE ENCLOSURE AS DETAILED
BELOW. DO NOT MOUNT VIA THE PROCESS CONNECTION ONLY.
The One Series product may be mounted in any position providing the electrical conduit
connection is not facing up. See Diagrams 1 and 2 on pg. 24/25. Ensure the process connection
is sealed to the process port to prevent leakage.
Electronics Housing
For products beginning with D1A, D1B & D1C, mount the unit using the two (2)¼" clearance holes
in the mounting ears. Plumb sensor to the process port.
For products beginning with D1D - Mount the unit to a flat surface using the 1/4" diameter bolt
holes shown in Diagram 3 (pg. 25). Maximum diameter of the screw head is 0.285. Attach
conduits to insure a water proof NEMA 4X system. Conduit fitting should be sealed if condensation
or water entry is a possibility.
Process Connections
PRESSURE AND DIFFERENTIAL PRESSURE MODELS
To pipe mount. Thread the pressure connection onto the pressure port. Use a wrench on the hex
pressure connection to tighten. For differential pressure models (dry only), connect to 1/4"-18 NPT
fitting or use barb fitting kit #62169-19 (2 re uired). Test for leaks. IN HIGH SHOCK AND VIBRATION
APPLICATIONS, SECURE THE ENCLOSURE AS DETAILED ABOVE. DO NOT MOUNT VIA THE PRESSURE
CONNECTION ONLY.
LOCAL AND REMOTE TEMPERATURE MODELS
For surface sensing (models H & R): Secure the 2½" sensor housing to the pipe or vessel using
an adhesive or strapping method suitable for the application.
For immersion sensing (models L, H or R): 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 or union connector.
For 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 2½".
For remote sensors, route the extension wire to avoid contact with live components. Avoid kinks,
or excessive flexing.

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Wiring
Tools Required
Flat-blade screwdriver if terminal block is specified
Wire strippers
DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING UNIT. WIRE IN ACCORDANCE WITH
NATIONAL AND LOCAL ELECTRICAL CODES. MAXIMUM RECOMMENDED WIRE SIZE IS 14 AWG.
THE RECOMMENDED TIGHTENING TORQUE FOR FIELD WIRING TERMINALS IS 6.5 IN/LBS.
ELECTRICAL RATINGS STATED IN LITERATURE AND ON NAMEPLATES MUST NOT BE EXCEEDED.
OVERLOAD ON A SWITCH CAN CAUSE FAILURE.
ALTHOUGH THE ONE SERIES INCORPORATES REVERSE POLARITY AND SURGE PROTECTION
ON THE POWER SUPPLY INPUT, IT IS HIGHLY RECOMMENDED THAT POLARITY AND VOLTAGE
LEVELS BE CONFIRMED PRIOR TO POWERING THE UNIT. IF SWITCHING OF THE OUTPUT ON START-UP
WILL HAVE ADVERSE AFFECTS ON THE SYSTEM, ENSURE THAT THE OUTPUT(S) ARE NOT CONNECTED
UNTIL THE PRODUCT HAS BEEN CONFIGURED APPROPRIATELY.
NOTE: If unexpected changes in the output will have an adverse affect on your system, it may be
best to configure the product off-line by applying temporary power to the device and programming
the mode, set point and deadband values. The inputs and outputs of the One Series product are
protected against reverse polarity and over voltage. However, correct wiring is essential to ensure
proper operation of the switch. Optional configurations may change the terminal designation,
location, wire color or size. Be certain to choose the proper wiring diagram for the product being
installed. See Diagrams 4 to 14 for wiring/terminal designations.
Ground Connections for Products Beginning with D D
Connect ground wire to the Ground Screw in the upper left hand corner of the AC Power
Supply enclosure (see Diagram 3 - 115 VAC Power Supply Configuration).
Power Supply Connections (Models D A, D B, & D C only)
The One Series is powered using an 18-30 VDC power source.
The power supply circuit common is shared internally with:
nthe IAW switched output (all models)
nthe 100 mA open drain switch output (models D1A & D1B only)
nthe optional 4-20 mA signal (all models)
Connect the positive (+) lead to the Red, 20 AWG wire (Model A) or
the terminal marked V+ (Models B & C).
Connect the negative (-) lead to the Black, 20 AWG wire (Model A) or the terminal marked circuit
common (Models B & C). See Diagram 4.

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Power Supply Connections for Products Beginning with D D
The D1D One Series is powered using 115 VAC, +/- 10%. The power supply should be wired up
to TB2 terminals noted L1 (Hot) and L2 (Neutral) per Diagram 3 - Power Supply Configuration.
Primary Switched Output Connections (T ype D A or D B)
The One Series' models A & B 100 mA open drain switched output is a "sinking" output which
completes the circuit to the circuit common. The power for the switched output must be provided
externally and referenced to the power supply circuit common (earth ground). The negative (-)
side of the load will be connected to the One Series output connection. The positive side of the
load is connected to the load power source V+. See Diagram 8.
NOTE: If the switched output load is inductive (e.g., a relay), a fly back diode, such as a 1N914
should be used to prevent electrical spikes into the switched output circuit. See Diagram 9.
Logic Solver Connection For 00mA Switched Output
The One Series' 100 mA switched output may also be connected to a digital input channel on a
logic solver. Some logic solver inputs re uire a pull-up resistor where an appropriately sized pull-
up resistor must be connected between the digital input and a DC power source. The value of the
pull-up resistor must be calculated based on the excitation voltage and the voltage threshold for
a logic level low re uired by the logic solver. See Diagram 10.
Solid State Relay Switched Output (Type D C)
The One Series SSR switched output is a single pole, single throw (SPST) switching device which
makes and breaks the output circuit. Two terminals are provided for the external load power
source (VAC-HI) and the switched signal connected to the device under control (LOAD). Wire the
output as follows, per Diagram 11.
nThe power source connects to the terminal marked VAC-HI
nThe load connects to the terminal marked LOAD
nThe other load connection is to the power source return
Solid-State Relay Output Connections (Type D D)
The SPST solid-state relay output is rated at 5A maximum @ 115/230 VAC. Off-state leakage
current is 0.1mA @ 115/230 VAC. Connect the load to TB2 per Diagram 3. Connect one end of
the load to L2 on the terminal block and the other end is connected to LOAD on the terminal block.
For standard D1D models the VAC input that powers the unit also feeds the input side of the SSR
switch. Option M027 is used if an independent VAC input to the SSR is desired (SSR input range
24-280 VAC). For inductive loads (contactors, solenoids or motors), option M026 must be
specified. For 230 VAC models, specify option code M028.
IAW Output Connections
The One Series open drain IAW output is a 100 mA "sinking" output which completes the circuit
to the circuit common. The power for the IAW output must be provided externally and
referenced to the power supply circuit common (earth ground).

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If the device to be controlled is a pilot light or relay, the negative (-) side of the load will be con-
nected to the One Series output connection.
For Model A, this would be the Orange, 20 AWG wire.
For Models B & C, the terminal is marked IAW output.
The positive side of the load is connected to the positive side of the power source V+.
See Diagram 5.
NOTE: If the IAW load is inductive (e.g., a relay), a fly back diode, such as a 1N914 should be
used to prevent electrical spikes into the switched output circuit. See Diagram 6.
For model D1D (VAC powered), the IAW switch 5 to 30 VDC power must be supplied externally.
Wire the positive side of the "load" to the power supply and the negative side to the terminal marked
IAW on TB1 per Diagram 3.
Logic Solver Connection For IAW Output
If the One Series IAW output is connected directly to a digital input channel on the logic solver,
an appropriately sized pull-up resistor may be re uired (see note) between the digital input and
a DC power source. The value of the pull-up resistor must be calculated based on the excitation
voltage and the voltage threshold for a logic level low re uired by the logic solver. See Diagram 7.
NOTE: Some logic solver inputs already include a pull-up resistor or circuit. Consult United Electric for
flow charts, state diagrams and timing charts for the IAW output when interfacing with a logic solver.
Optional 4-20 mA Analog Process Signal Output
The One Series 4-20 mA output signal is intended for remote monitoring or trending of the
process variable. The output is a sourcing output which is powered from the One Series VDC
power. It does not use a separate loop power supply, which simply means, no external power
supply should be applied to this connection.
The One Series sources current to the load, indicator, controller or an analog input of a logic
solver. See diagram 12 and 13. One side (positive, +) of the load (500Ωmax.) is connected to
the 4-20mA output and the other side should be returned to the One Series common
(to complete the circuit loop).
4-20 mA connections to positive side of the load circuit:
nFor Model A, this would be the Yellow, 20 AWG wire.
nFor Models B & C, the terminal is marked 4-20 mA.
nFor Model D, the terminal is marked TB1 and labelled 4-20 mA
The Negative (-) lead of the load circuit must return to the One Series circuit common connection.

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Summary of Wiring Connections
The following tables show the output function and the corresponding connection on the product.
Wit Switc Rating Code A
FUNCTION WIRE GAUGE/COLOR
Switched Output (5 to 30 VDC, 100 mA max.) 20 AWG/Brown
IAW Output (5 to 30 VDC, 100 mA max.) 20 AWG/Orange
4 - 20 mA Output - Positive (+) (Optional) 20 AWG/Yellow
Power Supply Input + (18 - 30 VDC) 20 AWG/Red
Power Supply and Signal Ground (Common) 20 AWG/Black
Wit Switc Rating Code B
FUNCTION TERMINAL LABEL
No Connection Blank
Switched Output (5 - 30 VDC, 100 mA max.) SWT-OUT
IAW Output (5 - 30 VDC, 100 mA max.) IAW
4 - 20 mA Output - Positive (+) (Optional) 4-20MA
Power Supply Input + (18 - 30 VDC) + VDC
Power Supply and Signal Ground COMMON
Wit Switc Rating Code C
FUNCTION TERMINAL LABEL
Switch Supply - IN (24 - 280 VAC, 15 A max.) VAC-HI
Switched Output - OUT (24 - 280 VAC, 15 A max.) LOAD
IAW Output (5 - 30 VDC, 100 mA max.) IAW
4 - 20 mA Output - Positive (+) (Optional) 4-20MA
Power Supply Input + (18 - 30 VDC) + VDC
Power Supply and Signal Ground COMMON
Wit Switc Rating Code D
FUNCTION TERMINAL LABEL
Switch Output (115 VAC, 5 A max.) LOAD (see note)
Power Supply Input (115 VAC) L1
Power Supply Return (115 VAC) L2
4 - 20 mA Output - Positive (+) (Optional) 4-20MA
IAW Output (5 - 30 VDC, 100mA max.) IAW
Power Supply and Signal Ground COMMON
NOTE: For units with Option M027 only:
Solid-state relay INPUT connection (free contact) SSR INPUT
Solid-state relay LOAD connection (free contact) SSR LOAD

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T eory of Operation
The One Series electronic switch evaluates the measured process variable and switches the
output ON or OFF based on the set point & deadband values, and the selected switch mode.
Programmable features such as set point, deadband and switch mode determine how the product
is to operate and at what values.
nThe SET POINT is the value at which the output switch turns ON or OFF to initiate
an alarm or shutdown se uence. See Setting of User Parameters - Set Point.
nThe DEADBAND setting determines the difference above or below set point at which
the output switch will reset after the set point has been reached. See Setting of User
Parameters - Deadband.
nThe SWITCH MODE setting determines if:
oThe switched output is ON or OFF above or below the set point value
(NO or NC).
oThe local LED status indicator flashes to indicate the switch output has tripped
either above or below the set point value.
oThe I Am Working (IAW) signal pulses either above or below the
set point value.
oThe deadband is above or below the set point value. See Setting
of User Parameters - Switch Mode.
nThe - Extreme and + Extreme stored by the One Series are the minimum and maximum
process values (lowest and highest) sensed by the product. This provides a snapshot of
process variations since the last time these values had been reset by the user.
A local status indicator (LED) aids the user in determining the switch output state. When the LED
is illuminated continuously, it signifies normal operation (no fault condition). A flashing LED
signifies a tripped condition (an alarm or shutdown condition, process variable has surpassed the
set point value). If the LED is not illuminated, it signifies the switch has lost power or is not able
to function properly. Whether the LED output is ON above or below the set point is determined
by the SWITCH MODE setting.
I Am Working (IAW) signal provides a remote signal which can be used to determine the
"health" of the product. It can also be used to determine whether the output has tripped.
The IAW signal has three (3) states:
nON when the product is powered, and internal diagnostics determine
that it is functioning properly and the output has not tripped.
nOFF when product has lost power or the internal diagnostics have indicated a failure.
nFlashing ON and OFF (in 50 mS. intervals) to indicate that
the product is functioning properly but the output has tripped.
The IAW output is an open drain (collector) output which may be used as a signal to a PC, PLC
or DCS logic input or to drive a 5 to 30 VDC (100 mA max.) load. The internal diagnostics test the
"health" of the microprocessor, sensor, firmware and power supply for proper operation.

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The Switched Output may be used in a number of ways to provide local control of the alarm/
shutdown circuit, eliminating the need for remote monitoring, interpretation, and switching logic
algorithms in a PLC, DCS or computer. The One Series switched output is intended to initiate an
alarm or shutdown se uence locally and independent of other interpretive devices. Either the low
level open drain output or the optional high current solid-state relay provides fast, reliable
switching in the field at the point of measurement. The switched output is designed as a fail-safe-
open circuit so that if the One Series loses power the output will open.
The standard, open drain output may be used to trigger logic level circuits to initiate an alarm or
shutdown se uence. The optional high level solid-state relay is intended to switch loads directly
such as relays, contactors or moderate AC voltage loads.
A LCD digital displayprovides additional information such as process variable magnitude (both
numeric and in a bar graph format), units of measure, and switch status. The measured process
variable and units of measure are displayed numerically on the top line of the display. The second
line of the display serves as a percent of range bar graph indicator and displays several
diagnostic messages.
The bar graph indicator consists of 48 segments, each segment representing a process value of
approximately 2% of span. NOTE: If the 4-20mA output is scaled (option M205), the bar graph
will indicate the scaled range while the digital readout indicates the full range of the process.
Certain diagnostic information may be displayed in the lower line of the display. If the output trips,
VALUE > SET POINT or VALUE < SET POINT will flash, alternately with the bar graph indication.
An alternately flashing display of OVERRANGE ! informs the user that the measured process
variable is above the maximum range value.
Display diagnostic Displayed if process variable is:
VALUE > SET POINT Above high limit alarm/shutdown set point value
VALUE < SET POINT Below low limit alarm/shutdown set point value
OVERRANGE Above the device maximum operating range
OUT OF RANGE Set point or deadband value is set out of range
A four key keypad allows for front panel programming of the operating parameters. SET POINT,
DEADBAND, SWITCH MODE, process EXTREMES and UNIT ID NUMBER can be displayed and edited
using the keypad.
Key In Operating Mode In View/Edit Mode
SET POINT value Increases selected value
DEADBAND value Decreases selected value
SWITCH MODE Shifts the cursor Left
UNIT #/RANGE # Shifts the cursor Right
nA single press of a key displays the appropriate parameter.
NOTE: If there is no keypad activity for approximately 4 seconds,
the unit returns to normal operation.
nPressing the and keys simultaneously allows you to
oEnter the editing mode and
oExit the editing mode and save the new parameter.
nPressing the key twice rapidly, displays the (+) and (-) Extreme values read by the
product since the last time these values were reset.

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NOTE: If the product remains in the EDIT mode, and there is no keypad activity for approximately
30 seconds, the unit returns to the normal operating mode and new data is NOT saved.
An optional 4 to 20 mA analog current output is available to provide a remote indication of the
process variable, proportional to the full scale range of the product. The output signal is
proportional over the operating range of the unit (4 mA at the minimum range value, 20 mA at
the maximum range value). The output is non-isolated, capable of driving loads up to 500Ω
maximum impedance and may be used as an input to a PC, PLC or DCS, to monitor process trends
or to drive a remote analog indicator. Option M205 allows for a factory-set scaling of the 4 to 20
mA output to match specific applications.
Start Up Indication
At start-up the display reads the version of the software running and the results of the self-
diagnostics test:
*VERSION X.XX*
**** o.k. ****
After approximately 2 seconds the unit enters NORMAL CONTROL MODE and shows appropriate
display and alarm status indication:
X.XXX psi
|||||||||||||||||||||||||||

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Setting of User Parameters
Tools Required
Phillips head screwdriver
Remove Lexan® cover to access keypad. Remember to replace cover when programming is
complete.
Switch Mode
TO DISPLAY THE SWITCH MODE
The SWITCH MODE determines if the output energizes above or below the set point, if the
deadband is above or below the set point, and if the output status LED and IAW signal flash
when the output energizes or de-energizes. To simplify set-up, the One Series is programmed to
configure the switch output status, LED and IAW status, and deadband operation, based on the
type of application desired. There are four switch modes. Each set the operating characteristics
as follows:
Mode Output Front Panel IAW Deadband
Switch Status LED Switched is:
Contacts "Flashes" Output
"Pulses"
High Limit Alarm N.O.,close on rise above set point above set point below set point
High Limit Shutdown N.C.,open on rise above set point above set point below set point
Low Limit Alarm N.O.,close on fall below set point below set point above set point
Low Limit Shutdown N.C.,open on fall below set point below set point above set point
These modes pre-configure the One Series for logical operation. Example: For High Limit Alarm,
when the process variable goes above set point the output turns ON, both the local and remote
status indicators flash signaling a tripped output, and the switch resets once the process variable
has dropped below the set point value and the deadband.
To display the SWITCH MODE press the arrow key:
X.XXX psi
High Limit Alarm
NOTE: If there is no keypad activity for approximately 4 seconds,
the unit returns to normal operation.
TO CHANGE THE SWITCH MODE
1. First display the SWITCH MODE by pressing the arrow key.
2. Simultaneously press and hold the and keys. A cursor will flash on the display.
You are now in the EDIT mode.
3. Use the and keys to scroll the display to the desired mode.
4. To save the new value, press the and keys simultaneously. Unit reverts to
NORMAL OPERATING MODE.
NOTE: If the product remains in the EDIT mode, and there is no keypad activity for approximately
30 seconds, the unit returns to normal operating mode and new data is NOT saved.

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Set Point
TO DISPLAY THE SET POINT
The SET POINT is the value at which the output trips. The switched output will reset once the
process variable returns beyond the set point value plus (or minus) the deadband value
(depending on the SWITCH MODE selected). Example: For High Limit Alarm, if SP = 300,
Deadband = 50, switch energizes at 300 and de-energizes @ 250.
To display the SET POINT value, press the arrow key:
X.XXX psi
Set Point: X.XXX
NOTE: If there is no keypad activity for approximately 4 seconds,
the unit returns to normal operation.
TO CHANGE THE SET POINT VALUE
1. First display the SET POINT value by pressing the arrow key.
2. Simultaneously press the and keys. A cursor will flash on the display.
3. Use the and keys to move the cursor to the value to be edited.
4. Use the and keys to scroll the digit to the desired value.
NOTE: In the left hand most value position, the and keys toggle between (+) and (-),
however negative values will NOT be accepted by the product.
5. To save the new set point, press the and keys simultaneously. Unit reverts to
NORMAL OPERATING MODE.
NOTE: Attempting to select a Set Point value outside of the operating range will result in an error
message - "Out Of Range" - and the value will be ignored.
NOTE: If the product remains in the EDIT mode, and there is no keypad activity for approximately
30 seconds, the unit returns to the normal operating mode and new data is NOT saved.
Deadband
The DEADBAND value is the difference, in units, between when the switched output energizes and
de-energizes. The DEADBAND operation will change based on the selected SWITCH MODE to be
either positive (above) or negative (below) the set point. The deadband value is always set as a
positive number (no negative values).
nIn High Limit Alarm and High Limit Shutdown mode,
the deadband is below the set point.
nIn Low Limit Alarm and Low Limit Shutdown mode,
the deadband is above the set point.
TO DISPLAY THE DEADBAND VALUE
To display the deadband value, press the arrow key:
X.XXX psi
Deadband: X.XXX

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TO SET THE DEADBAND VALUE
1. First display the DEADBAND value by pressing the arrow key.
2. Simultaneously press and hold the and keys. A cursor
will flash on the display.
3. Use the and keys to move the cursor to the value to
be edited.
4. Use the and keys to scroll the digit to the desired value.
5. To save the new value, press the and keys.
Unit reverts to NORMAL CONTROL MODE.
NOTE: If the product remains in the EDIT mode, and there is no keypad activity for approximately
30 seconds, the unit returns to the normal operating mode and new data is NOT saved.
NOTE: Consider the SWITCH MODE and operating range when determining set point and deadband
values to ensure that the reset value is within the operating range. For example, if the unit is
operating in a High Limit Shutdown Mode, the set point is 25 psi and the deadband is 30 psi, the
output will trip OFF but never reset.
-/+ Extreme Values
The - Extreme and + Extreme are the minimum and maximum process values (lowest and
highest) sensed by the product. This provides a snapshot of process variations since the last time
these values had been reset by the user.
TO DISPLAY THE -/+ EXTREME READINGS
Press the arrow key two times rapidly:
- Extreme XXXX
+ Extreme XXXX
TO RESET BOTH THE -/+ EXTREME READINGS
Press the arrow key two times rapidly. Then, simultaneously press
the and keys. Both values will reset. Unit reverts to NORMAL CONTROL MODE.
Unit # and Operating Range
The UNIT # is a factory set value for factory use only. There is no default value and this number
may be any value between 01 to 99. The Operating Range is for reference only. This will
correspond to the minimum and maximum values that the unit may be set to, or will display.
To display the Unit # and Operating Range, press the arrow key:
0 to XXXX psi
Unit #: XX
Replacement Parts /User Service
There are no user serviceable parts in this product. The troubleshooting guide on the following
page will help to determine if the One Series is functioning properly. Should a product re uire
service, it must be returned to the factory for evaluation.

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The One Series Electronic Pressure, Differential Pressure and Temperature Switches are designed
for simple installation and programming, providing years of trouble-free and reliable service. In
the event that the One Series appears to be malfunctioning, please refer to this Troubleshooting
Guide, matching the symptom to the recommended solution. If the symptom cannot be found in
this Guide or the solution does not correct the malfunction, please call United Electric Controls
Technical Support at [phone]. Our representatives will help you to determine if there is
a problem with your One Series that re uires service.
Troubles ooting
A. There appears to be no power
Intent: To locate power supply, interconnection, or One Series fault.
Question Answer Direction
1. Has the unit ever functioned? Yes Go to step A2
No Go to step A5
2. Is the LCD display functioning? Yes The unit has power.
Go to step A4
No Go to step A3
3. Is the switched output status Yes The unit has power.
LED ON  or flashing? Done
No Go to step A4
4. Using the voltmeter, is the incoming Yes The unit has power. Done
power supply level between 18 & 30 Vdc? No Go to step A5
(See Wiring Diagrams)
5. Turn off all power to the unit and check Yes Go to step A6
connections for the incoming power supply No Go to step A6
wires. Are they correct and secure? (See Wiring Diagrams)
6. Restore power to the unit. Ensure supply Yes Done
voltage is between 18 and 30 VDC. Do the LCD No Contact
display and/or switched output status LED illuminate? United Electric Controls or
their authorized Distributor
for further assistance.

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Question
1. Turn off all power to the unit
and the load and check that the load
is connected and operating properly.
Are the connections correct and secure?
(See Wiring Diagrams)
2. Reapply power to the unit and record
the following data from the display: Process
variable, Set Point value (use Up arrow key),
Deadband value (use Down arrow key), and
Operating Mode (use Left arrow key). Also
record Output Options code from unit's
nameplate.
3. Refer to Table 1 (Pg. 21). Based on the
switch operating mode, set point, deadband
and process variable, should the output be
"ON"?
4. Adjust set point and /or deadband so that
the output should turn "ON"
5. Does the output status LED correspond to
Table 1?
6. What is the output type noted on the
nameplate (D1A, D1B, D1C, D1D)?
7. If the output is Type D1C or D1D, using a
voltmeter, carefully measure the AC voltage
between the One Series Load Terminals and
Ground (See Wiring Diagrams). Using the set
point and/or deadband adjustments, cycle the
output ON and OFF. Does the output voltage
vary between approx. 0 VAC (OFF) and the
voltage applied to the Load (ON)?
8. Then the SSR is cycling ON and OFF. Turn off
power to the One Series and/or the load, dis-
connect the Load from the One Series terminal
block and test the output load wiring for conti-
nuity. Does wiring have continuity?
Note: when using the D1C or D1D to switch
inductive loads, a filter (snubber) may be
re uired for proper operation. Without the
snubber, the SSR may "chatter" or not switch
properly.
Answer
Yes
No
Yes
No
Yes
No.
Yes
No
Yes
No
B. The switched output does not appear to be functioning
Intent: locate load element, interconnection, or One Series fault
Direction
Go to step B2
Correct and secure wires.
Go to step B3.
Go to step B3
Go to step B5
Go to step B4
Go to step B5
Go to step B6
Contact United Electric Controls
or their authorized Distributor
for further instructions.
For D1A and D1B:
Go to step B9
For D1C and D1D:
Go to step B7
Go to step B8
Contact United Electric Controls
or their authorized Distributer
for assistance.
Reconnect wires and retest out-
put. Done
Repair output load wiring
and/or connections as re uired.
Reconnect and test. Done.
Add external snubber to circuit
or contact United Electric
Controls or their authorized
Distributor for further assis-
tance (United Electric offers a
SSR with an integral snubber as
an option).

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Question
9. If the Output Type is D1A or D1B, using a
voltmeter, measure the DC voltage between the
One Series Switch Output terminations and
Ground (See Wiring Diagrams). Using the set
point and/or deadband adjustments, cycle the
output ON and OFF. Does the output voltage
vary between LOW (when output is ON) and
HIGH (when output is OFF) - e.g., between
approx. 1 VDC or less and the value of V+?
10. If the output varies, the One Series output
is functioning. Remove power from the One
Series and disconnect the load from the output
connections. Temporarily, connect the load wire
to the Ground connection. Reapply power. Does
the output load now turn ON?
Direction
Go to step B10
Contact United Electric Controls
or their authorized Distributor
for further instructions.
Contact United Electric Controls
or their authorized Distributor
for further assistance.
Check the load element for
proper operation and connec-
tions to ensure proper and
secure wiring.
Answer
Yes
No
Yes
No
C. The IAW output does not appear to be functioning
Intent: To locate load element, interconnection, or One Series fault
1. Perform Steps B1 and B2 for the IAW
output. Refer to Table 1 to determine proper
IAW states (Pg. 21)
2. Should the Output status LED be "ON"
or "Flashing"?
3. Using the set point and/or deadband
adjustments, change the values so the
Output Status is "Flashing". Is the Output
load cycling?
4. Perform the voltage measurements
as outlined in Steps B9 and B10 for the
IAW output.
Yes
Yes
No
Yes
Go to step C2
ON: Go to step C3
Flashing: Go to step C4
Done
Go to step C4
Done

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D. The 4-20mA output signal does not appear
to be functioning
Intent: To locate load element, interconnection, or One Series fault
Question
1. Turn off all power to the unit and verify the
connections are correct and secure (See Wiring
Diagrams)
2. Remove the current loop load wire. Using an
ohmmeter, measure the resistance of the cur-
rent loop load (4-20mA load connection to
Ground). Is this value less than 500 ohms?
3. Connect a milliamp meter in series with the
current loop circuit and apply power to the One
Series. Does the 4-20mA output function prop-
erly?
4. Turn off power and disconnect the current
loop connection to the load device. Connect the
meter from the 4-20MA output connection to
the Ground connection. Reapply power - does
the 4-20mA output function properly?
Answer
Yes
No
Yes
No
Yes
No
Yes
No
Direction
Go to step D2
Correct and secure wires. Go to
step D2
Go to step D3
Check the load connections to
ensure proper and secure con-
nections. If the current loop
load exceeds 500 ohms, correct
current loop connections and
loading. Go to Step D3.
Remove milliamp meter and
reconnect wires. Done
Go to step D4
Remove milliamp meter and
reconnect wires. Done
Contact United Electric Controls
or their authorized Distributor
for further assistance.
E. The display reads: VALUE > SET POINT
Intent: Determine correctness of One Series Measurement/Message
This indicates that the measured process variable has exceeded the Set Point
value and is currently more than the Set Point value minus the Deadband value.
The output has "tripped" (either "ON" or "OFF" based on the Switch Output Mode
selection) and has not reset.
Verify Set Point, Deadband,
Switch Output Mode settings
and Process Variable
F. The display reads: VALUE < SET POINT
Intent: Determine correctness of One Series Measurement/Message
This indicates that the measured process variable reached the Set Point value and
is currently not greater than the Set Point value plus the Deadband value. The
output has "tripped" (either "ON" or "OFF" based on the Switch Output Mode
selection) and has not reset.
Verify Set Point, Deadband,
Switch Output Mode settings
and Process variable