•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.
WP-302A/B1: Pt100, Pt1000, Cu50, Cu100
WP-302A/B2: S, R, B, K, N, E, J, T, WRe3-25
WP-302A/B3: Pt100, Pt1000, Cu50, Cu100
S, R, B, K, N, E, J, T, WRe3-25
Accept the user’s designation
WP-302A/B1: A two/three/four-wire system thermal
WP-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.)
WP-302A/B3: adopt the connection mode of WP302A/B1
or WP302A/B2 according to the needs
Appendix 1: List for the inputted sensor types and accuracies
≤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
Short circuit: accept the user’s designation (3.5~3.75mA)
Open circuit: accept the user’s designation (21~23mA)
Can be set as 3.2mA or 24mA
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
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
-40~85℃ -20~60℃ (Anti-explosion type)
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
Display and control
Size of display
℃ or ℉
The 3 buttons of the panel
Between the input and output Ueff = 1 kV, 50 Hz, 1 min
Certificate and licence
Intrinsic safety type