W181 module in compact DIN rail enclosure, front three-quarter view: OLED display, three push buttons, DIP switch, USB-C port and screw terminals

PT100 to PWM for fan or heater, high-side switched, with OLED display

Article number W181A-P500

The W181A-P500 measures the temperature with a PT100 sensor and uses it to drive two PWM outputs, high-side switched. Below a start temperature the output is at an adjustable minimum, above an end temperature at the maximum, and in between it rises evenly. This way a fan runs only as fast as needed, or a heater keeps a room or cabinet at temperature. Start and end temperature and the minimum and maximum are set on the OLED display.

Supply 24 V DC (±15 %)
Input PT100, 2-, 3- or 4-wire
Output two PWM outputs, high-side switched

Price on request

Supplied in series, from 10 units per item. Not in stock? Then we build your series.

One or a few units only as a trial, for a company with a series in sight.

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Orders are placed by email with a purchase order. We supply businesses only.

Specifications

Specifications
Supply	24 V DC (±15 %)
Input	PT100, 2-, 3- or 4-wire
Measuring range	Adjustable, for example 0 to 100 °C
Output	Two PWM outputs, high-side switched
Isolation	Not galvanically isolated
Setup	OLED display with UP, DOWN and OK buttons; DIP switch for basic choices
Control	Start and end temperature and output minimum and maximum adjustable
USB	USB-C for software updates and reading the status
Wi-Fi	Built-in hotspot for software updates
Mounting	DIN rail, compact enclosure
Internally fitted with	PR181T23 and PR181s10

Printable datasheet

Setup

Connect the supply, the PT100 and the fan or heater according to the wiring diagram supplied with the module.
Set the start and end temperature on the display.
Set the output minimum and maximum and store the settings.

Application

Letting a cabinet fan follow the temperature in a control cabinet
Running the cooling fan of an engine or drive quietly at low load
Controlling a heating element to keep a cabinet or room frost-free

W181 series: compact modules with OLED display and Wi-Fi

The modules in the W181 series are compact and fit on a DIN rail. They have an OLED display and push buttons, so they can be set up without a computer and show the current values. A DIP switch on the board fixes basic choices. Software updates are loaded through the USB-C port and a built-in Wi-Fi hotspot. The modules run on 24 V DC. Extensions are possible on request, such as an extra relay output, a different sensor input or a bus connection.

More about the W181 series