PR181 module in DIN rail enclosure, front three-quarter view

Potentiometer to 4-20 mA signal conditioner, isolated, with display

Article number PR181-X089

The PR181-X089 converts the position of a potentiometer into a 4-20 mA signal. The output is galvanically isolated from the input and the supply to prevent ground loops. Lower and upper limits of input and output are set independently on the display, as is the rise and fall rate of the output. As delivered, the module gives 4 mA with the potentiometer fully anticlockwise and 20 mA fully clockwise.

Supply 9 to 30 V DC
Input potentiometer on terminals 3, 4 and 5
Output 4-20 mA as delivered, 21 mA max.; lower and upper limit adjustable

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Other version: PR100s01. The PR100s01 performs the same conversion without a display: it is set up with three push buttons on the module. The output is not isolated (the output minus is connected to the supply minus), the supply is 12 and 24 V DC (operating range 11 to 30 V DC) and the ambient temperature 0 to 55 °C. Do input and output need to be isolated, or would you rather set it up on a display? Then choose the PR181. Otherwise the PR100 is sufficient.

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Specifications

Specifications
Supply	9 to 30 V DC
Input	Potentiometer on terminals 3, 4 and 5
Output	4-20 mA as delivered, 21 mA max.; lower and upper limit adjustable
Isolation	Output galvanically isolated from input and supply
Setup	Display with UP, OK and DOWN buttons
Rise and fall rate	Adjustable on the display
Ambient temperature	-25 to 55 °C, non-condensing
Dimensions	45 x 83 mm with DIN rail enclosure, 42.6 x 72 mm without
Factory setting	Potentiometer fully anticlockwise = 4 mA, fully clockwise = 20 mA

Connections

Connections
Terminal	Function
Terminal 1	Supply plus
Terminal 2	Supply minus
Terminal 3	Potentiometer minus, internally connected to terminal 2
Terminal 4	Potentiometer signal (wiper)
Terminal 5	Potentiometer plus
Terminal 6	Isolated output common
Terminal 7	Isolated 4-20 mA output (plus)
Terminal 8	Not used

Datasheet (PDF)PDF, 142 kB

Setup

Connect the module according to the terminal table and switch on the supply.
Set the potentiometer to its lowest position, for example fully anticlockwise. In the menu, select IN1 – Set minimum, press OK, select YES and press OK again.
Set the potentiometer to its highest position, for example fully clockwise. Select IN1 – Set maximum, press OK, select YES and press OK again.
Set the lower limit of the output with OUT1 minimum adj: change the value with UP and DOWN and confirm with OK.
Set the upper limit of the output in the same way with OUT1 maximum adj.
If required, set the rise and fall rate of the output with IN1 Ramp-Up and IN1 Ramp-Down.
Fine adjustment: IN1 minimum adj and IN1 maximum adj fine-tune the input limits. Setting OUT1 invert to 1 reverses the output: the lowest potentiometer position then gives the highest output level.
Go to the SAVE menu to store the new settings.

Application

Connecting a potentiometer to a 4-20 mA input, with galvanic isolation to prevent ground loops
Driving motors, pumps, valves and hydraulics smoothly with the adjustable rise and fall rate

PR181 series: signal conditioners with display

The modules in the PR181 series are set up on the display on the module, using the UP, DOWN and OK buttons. On most versions the lower and upper limits of input and output are set independently, as is the rise and fall rate of the output; the settings of each module are listed on the product page under Setup. With an adjustable rise and fall rate, motors, pumps, valves and hydraulics can be driven smoothly. On versions with an analogue output, that output is galvanically isolated from input and supply to prevent ground loops. New settings are stored through the SAVE menu. The standard DIN rail enclosure measures 45 x 83 mm (board 42.6 x 72 mm); versions with more terminals are wider. Most modules run on 9 to 30 V DC at -25 to 55 °C, non-condensing.

For some conversions there is also a version without display and without galvanic isolation in the PR100 series: it is set up with push buttons and runs on 12 and 24 V DC (operating range 11 to 30 V DC). Where one exists, it is listed on the product page under Other version.

More about the PR181 series