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Wireless transmitter for measuring process signals (4-20mA)

Wireless transmitter for measuring process signals (4-20mA)

  • Robust wireless sensor
  • Suitable for 4-20mA signals
  • Communications by 868 MHz frequency band
  • Several configuration options, such as linking to the ATM monitoring systems


Price on request


Bel ATAL 0299-630610


For the wireless transmission of measurement data to a central point for storage, monitoring and presenting measurement data various radio standards are available. With the development of the Wireless Probe ATAL-series there was chosen for the license free 868 MHz frequency band, whereby reliably great distances can be bridged (indoor 50 to 80 meters). Because of the low energy consumption of the transmitter technology a battery life of about 3 years can be guaranteed. Thereby wiring is unnecessary and you could be saving significantly on installation costs. The ATAL-Wireless-Probe Series consists of a so-called Base Station and various sensor models with an integrated transmitter. Up to 99 sensors with 1 base station are combined. The base station has an internal memory for 100,000 measurements and can stand-alone collect data without a PC. If communication is being interrupted, then 10,000 local measurements (temporarily) are stored in internal memory of the transmitter. when the communication is resumed, the memory of the base station is being completed.

The WTT-204A is a battery-operated wireless sensor for process signals. The sensor is suitable for 4-20mA signals.


Conditions electronics: -20 to 80°C
Sensor Range: 0-25mA
Resolution: 25µA
Accuracy: ± 0.25% of the range
Input Impedance: ~45 kohm

Optionally available with 6-24V power connector (WTT-204A-EP)

Common specifications transmitters

Operating temperature: -20 to 80 °C
Supply: Battery 1 x AA etc.
Housing: IP65, grey
Dimensions: 88 x 120 x 36mm
Approval: R&TTE, CE
Configuration: With Atal Sensor Trend software
Frequency band: 868-870 MHz (915MHZ US)
Radio standard: ETS 300 220
Open field range: 1000 m (enclosed space 50-80 m)
Aerial: Internal
-Measurement interval (m): As from 1 sec./max. 99 sec./standard 10 sec. (adjustable by PC)
-Transmission interval (z): As from 5 sec./max. 5mm/standard 10 sec. (adjustable by PC)
Memory: 10,000 measured values (applicable if transmitter and receiver are used separately)
Alarm: Adjustable min. and max. limit values (applicable if transmitter and receiver are used separately)
Optional: External supply


  1. Lithium 3,6V battery (no wires)
    • Spare 3,6V battery for ATX/ATV data recorder
    • AA
    • type (no wires)



In various industrial applications, the monitoring from processes are essential. Thus, for example, the pharmaceutical industry is one of the largest users of moisture measuring equipment. Most drugs are sensitive to variations in moisture levels, so this should be monitored and measured so that the finished products are consistent in quality and performance.



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