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Transmitter TRF

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Weight transmitter RF 868 MHz. Selecting RF channel and address of comunication via DIP-SWITCH, external rechargeable battery-powered (4 AA) or 15Vdc ÷ 4.5Vdc. Procedures for restricted consumption for long range operation, PC application for configuration and calibration.

Procedure for limiting power consumption for long operation time, PC application for configuration and calibration.

Application 1: acquisition of single weight indicator from TRF with display on indicator

Application 2: weight acquisition from weight indicator of N TRF transmitters with indication on indicator

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Transmitter TRF Transmitter TRF Schema Transmitter TRF Montaggio

Technical Specifications

Power supply4 external AA 1.2 V Ni-Mh rechargeable batteries, or 4.8 V dc
Average consumption7 mA (1x350Ω), 10 mA (4x350Ω) continuous transmission 2Hz, 15 mA (1x350Ω), transmission on request 4Hz
Operating temperature-10 / +50 C (14 / 122 F) Humidity Maximum 85% non-condensing
Storage temperature-20 / +60C (-4 / +140F)
Overall dimensions126 x 79 x 41 mm / 4.96 x 3.11 x 1.61 in (l x h x p) esclusa antenna e connettore
Case materialDie-cast aluminum
Protection levelIP 65
Connections5.08 pitch screw terminal blocks with cable entry / 5-pin connector
Power supply load cells3,.3 V dc
Separated cell inputsMaximum 4 cells with 350 Ω
 Input sensitivity≥ 0,02 μV
 Linearity< 0,01 % of full scale
 Temperature drift< 0.01% of full scale
 Internal resolution24 bit
 Measuring rangeFrom -3.9 mV/V to +3.9 mV/V
 Output rateFrom 1 Hz to 5 Hz
Frequency866-868 MHz
Num. RF Channels7 selectable by DIP switch
Num. Network address15 selectable by DIP switch
Average radius of coverage50 m
Input230 V ac, 50 Hz
Average battery life~400 h con 1 cella 350 Ω, trasmissione continua a 2 Hz ~250 h con 4 celle 350 Ω, trasmissione continua a 2 Hz ~150 h con 1 celle 350 Ω, trasmissione a richiesta a 4 Hz
Rechargeable elements2 or 4 cells AA Ni-Mh 1,2V, 2500mAh
Recharge time6 hours (2 batteries), 14 hours (4 batteries)
Charge indicatorRed LED
Conforms to standardsEN 300 220 - EN 301 489 - EN60950 EN61000-6-2, EN61000-6-3, EN61010-1
For the complete and latest technical specifications, please refer to the technical data sheet which can be downloaded here:
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TypeTRF connector
Pin 1+ IN
Pin 2+ OUT
Pin 3- OUT
Pin 4- IN
TypeSwitch cable TRF connection
Pin 1- IN
Pin 2+ IN
Pin 3- OUT
Pin 4+ OUT


General precautions to be followed in the installation and assembly of load cells:

  • Follow the direction of application of force on the load cell
  • Do not exceed the limits of the temperature as indicated in the data sheet
  • Do not remove labels from the load cell
  • Adequately protect the cables with sleeves or channels
  • Carry out on each load cell a ground connection with suitable cable, shunt on mounting accessories
  • Do not carry out any welding on the mechanical structure after mounting the load cell
  • Avoid or reduce to a minimum level any mechanical constraints between the rigid structure and the weighing structure to avoid error in weighing and return to zero
  • In case of vibration or dynamic loads product the load cells with puffers / shock absorbers
  • Protect load cell from any dust accumulation with any appropriate means