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WP-301 Two-Wire System HART Intelligent Temperature Transmitter
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WP-301 Two-Wire System HART Intelligent Temperature Transmitter

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•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.
• HART communication protocol.
• 4-20mA output.
• 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. In addition, the remote parameter configuration of the transmitter can be realized easily by HART modem.
•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:
  WP-301A/B1: Pt100, Pt1000, Cu50, Cu100
  WP-301A/B2: S, R, B, K, N, E, J, T, WRe3-25
  WP-301A/B3: Pt100, Pt1000, Cu50, Cu100
              S, R, B, K, N, E, J, T, WRe3-25
  Accept the user’s designation
Connection modes
  WP-301A/B1: A two/three/four-wire system thermal resistance transducer
  WP-301A/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.) 
  WP-301A/B3: adopt the connection mode of WP301A/B1  or WP301A/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 (3.5~3.75mA)                   
  Open circuit: accept the user’s designation (21~23mA)                   
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
Rated operating conditions 
Ambient temperature
  -40~85℃   -20~60℃ (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 panel or HART handle and configuration software which is compatible with HART protocol 
Power supply
  15~36V 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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