Current loop sensor 0-20mA / 4-20mA

Galvanically isolated input from 1-Wire data bus

 Technical Features

  • Sensor for measuring currents in the range 0–20mA
  • Typically used to connect an industrial probe with 4–20mA output
  • 2.75kV galvanically isolation between current loop input and 1-Wire data bus
  • 1-Wire bus (2x RJ11 for daisy-chaining)
  • 16 bit resolution ADC
  • Accuracy ± 0.1%
  • Power supply: 4.5V to 5V (1-Wire bus)
  • Operating conditions: -20 to +70°C / 5 to 85% RH(non-condensing)
  • Mechanical dimensions 90 x 65 x 35 mm (2 modules wide)
  • Weight: 65 g
  • Mounting on 35 mm DIN top-hat rail

 Applications and usage

  • Signal converter for 0-20mA / 4-20mA industrial sensors
  • Measuring fuel level(gasoline or diesel) in a tank
  • Measuring pH, CO2 or gas pressure and concentration levels using special probes
  • Measuring pressure
  • Connecting electronic scales
  • Connecting other industrial sensors
  • The output readings in CLT420 can be processed in Ethernet controller IPS3000.
    Data in mA can be converted to other units using multiplier and offset.

 Installation Instructions

The sensor has 4-wires which are connected to a compatible IPsensors controller.

1 GND(Green/White)
2 1 wire Data(Green)
3 GND(Brown/White)
4 +5V(Brown)

All IPsensors controllers can support “1-Wire” sensors. On every sensor on the bus is assigned a unique serial number which is used to address the sensor during communication. Multiple sensors can be connected in two ways: directly connected (star topology) or “daisy chained” (linear topology). Many factors can determine the maximum length of the cable, including the sensor network topology, the number of sensors and ambient electromagnetic noise. Combined cable lengths to all sensors of 50 m using Cat 5e cable have been successful. However, due to the uniqueness of installation environments, results may vary. We recommend to do test in the desired environment before making a permanent installation. Cable capacitance generally limits the length. A linear (daisy chain) topology will minimize signal reflections, providing a more reliable connection and will allow longer cable length than a star topology. The 1-Wire bus is "single-ended" and has no intrinsic noise protection. If the cable is routed near power lines is susceptible to interference from fluorescent fixtures, motors or other noise sources. Keep the cable wiring short and avoid routing it near other electrical equipment.

CLT420 - user manual v1.0

User manual for Current loop sensor
0-20mA / 4-20mA
(pdf, 797k)


IP Sensors

Mladost 4, Business Park Sofia

1766 Sofia,



Phone: +359882493678

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