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  • Product Name: 303 RS485 intelligent temperature transmitter
  • Product Models: 303


• The transmitter, which is based on RS485 communication protocol, can provide the temperature acquisition with high speed, long distance and high reliability.
• While connecting to the thermal resistance transducer, it has short-circuit and open-circuit monitoring function;; while connecting to the thermocouple transducer, it has open-circuit monitoring function.
• By using the 3 built-in operating buttons, the parameters  can be set conveniently and, at the same time, the parameters of the transmitter can be set via RS485 bus.
• The rotatable LCD display enhances the flexibility of transmitter installation and displays the percentage of current measured value in the full scale, current measured value and its unit and the sensor type and the diagnostic messages of transmitter etc.
• The protection level of shell is IP67, which can be applied to the outdoor usage.
• Support all the transducers conforming to IEC751 and IEC584.
Technical parameters
Sensor type:
  303A/B1: Pt100, Pt1000, Cu50, Cu100
  303A/B2: S, R, B, K, N, E, J, T, WRe3-25
  303A/B3: Pt100, Pt1000, Cu50, Cu100
             S, R, B, K, N, E, J, T, WRe3-25
  Accept the user’s designation
Connection modes
   303A/B1: A two/three/four-wire system thermal       
               resistance transducer
   303A/B2: A thermocouple transducer and a thermal resistance transducer (three-wire) can work as the cold junction compensation or set the fixed cold-junction temperature to compensate without connecting to the thermal resistance transducer, or use the built-in thermal resistance transducer of the transmitter to conduct cold junction compensation (The compensation precision will effect the final measurement accuracy.) 
   303A/B3: adopt the connection mode of 303A/B1  
               or 303A/B2 according to the needs                                                                 
Measurement range
  Appendix 1: List for the inputted sensor types and accuracies                           
                       Response time
  ≤250ms  with sensor short-circuit and open-circuit  monitoring                     
Measurement accuracy
Digital measurement accuracy
  See appendix 1: List for the inputted sensor types and 
Long term drift
  The first year <0.035% full scale 
Temperature effects  
  See appendix 2: Effects of ambient temperature
Rated operating conditions 
Ambient temperature
  -4085℃   -2060℃ (Anti-explosion type)
Electromagnetic compatibility
  GB/T 17626, Grade 3
    Protection grade according to EN 60529
  Aluminium die casting
    1.3kg (not including temperature sensor)
Cable sealed tube connecting thread
  M20×1.5 other threads need to use adapters
Connection of sensor
  Integrated type
  split type
  See Appendix 3: Dimensional drawing for two-wire system   
                  intelligent temperature transmitter
Display and control
Size of display
Display precision
  5 digits
Unit (Switchable)
  ℃ or ℉
 The 3 buttons of the panel or PC
Power supply
  +24V DC ±5%
Certificate and licence  
Flame-proof type
Intrinsic safety type
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