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  • Product Name: 302 two-wire system intelligent temperature transmitter
  • Product Models: 302


•The two-wire system transmitter, which is based on current loop power supply, can effectively reduce the wiring costs and power consumption and enhance the anti-interference ability.
• 4-20mA output with multiple fault message feedback abilities.
•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 together with the highlighted LCD display, the parameters of the transmitter can be set locally conveniently. 
•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:
  302A/B1: Pt100, Pt1000, Cu50, Cu100
  302A/B2: S, R, B, K, N, E, J, T, WRe3-25
  302A/B3: Pt100, Pt1000, Cu50, Cu100
              S, R, B, K, N, E, J, T, WRe3-25
   Accept the user’s designation
Connection modes
  302A/B1: A two/three/four-wire system thermal       
                     resistance transducer
  302A/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.) 
  302A/B3: adopt the connection mode of 302A/B1  
              or 302A/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                     
  Two-wire system 4-20mA  
Load resistance Ra
    Ra≤(Us-14.7V)/0.024A, Us is the loop voltage
Sensor faults
  Short circuit: accept the user’s designation (3.53.75mA)                
  Open circuit: accept the user’s designation (2123mA)                  
System faults
  Can be set as 3.2mA or 24mA
Measurement accuracy
Accuracy (Digital measurement accuracy)
  See appendix 1: List for the inputted sensor types and accuracies
Analog output accuracy
  0.025% full scale
Long term drift
  The first year <0.2% full scale 
Temperature effects  
   See appendix 2: Effects of ambient temperature
Power supply effects
   <0.001% full scale/V
Load impedance effects  
   <0.025% full scale/100Ω
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
    1kg (not including temperature sensor)
  See Appendix 3: Dimensional drawing for two-wire system    
                                 intelligent temperature transmitter 
Cable sealed tube connecting thread
  M20×1.5 other threads need to use adapters
Connection of sensor
  Integrated type
  split type
Display and control
Size of display
Display precision
  5 digits
Unit (Switchable)
  ℃ or ℉
 The 3 buttons of the panel 
Power supply
  1536V DC
Electric isolation
  Between the input and output Ueff = 1 kV, 50 Hz, 1 min
Certificate and licence  
Flame-proof type
Intrinsic safety type
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