Datasheet W181A-P501

Valve and motor drivers (PWM)

Issued 3 November 2026

Thermocouple to PWM for fan, high-side switched, with OLED display

Article number W181A-P501

W181 module in compact DIN rail enclosure, angled side view: OLED display, push buttons, DIP switch and screw terminals

The W181A-P501 measures the temperature with a type K thermocouple and uses it to drive two PWM outputs, high-side switched. Between an adjustable start and end temperature, the output rises evenly from the minimum to the maximum. Because a thermocouple also measures high temperatures, the module suits cooling fans at furnaces, exhausts and hot machine parts. Settings are made on the OLED display.

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.

Specifications

Supply24 V DC (±15 %)
InputType K thermocouple, with cold-junction compensation
Measuring rangeAdjustable, for example 0 to 400 °C
OutputTwo PWM outputs, high-side switched
IsolationNot galvanically isolated
SetupOLED display with UP, DOWN and OK buttons; DIP switch for basic choices
ControlStart and end temperature and output minimum and maximum adjustable
USBUSB-C for software updates and reading the status
Wi-FiBuilt-in hotspot for software updates
MountingDIN rail, compact enclosure
Internally fitted withPR181T21 and PR181s10

Setup

  1. Connect the supply, the thermocouple and the fan according to the wiring diagram supplied with the module.
  2. Set the start and end temperature on the display.
  3. Set the output minimum and maximum and store the settings.