WT sensor PCT381 User manual

May 2023 1 www.wtsensor.com
PCT381 Isolated Temperature Transmitter
Features
■Can convert all inputs to 4-20mA
■Input: thermocouple, RTD, resistance
■Configuration directly via PDA or PC
■Build-in cold junction compensation
■Available with screw-in temperature probe
Applications
■Equipment support
■Automatic Temperature measurement and
control systems such as pumps,
compressors, natural gas pipelines, etc
■Temperature measurement of water or oil
in petroleum, chemical, electric power,
textile, and environmental protection
fields, etc.
Notes:
1 When measuring temperature, the
temperature measuring element should reach
thermal equilibrium with the measured object.
2 Make sure the insertion length is accurate.
3 Please read the Instruction Manual of the
product carefully before installation and check
the relevant information of the product.
4 Strictly follow the wiring method for wiring,
otherwise it may cause product damage or
other potential faults.
5 Misuse of the product may cause danger or
personal injury.
Product overview
PCT381 isolated intelligent temperature transmitter (round
card) is used for the signal input of resistance temperature
detector (RTD) and thermocouple (TC) and 4 - 20mA analog
output of the two-wire system.It is installed inside the
sensor(Form B).

Notes:
1 Do not misuse documentation
2 The information presented in this product sheet is for
reference only. Do not use this document as a product
installation guide.
3 Complete installation, operation, and maintenance
information is provided in the instructions of the product.
4 Misuse of the product may cause danger or personal injury.

May 2023 2 www.wtsensor.com
Technical Parameters
Input signal
Resistance temperature detector (RTD), Thermocouple (TC)
Cold-junction compensation
temperature scope
-20℃～60℃
Compensation precision
±1℃
Output signal
4-20mA
Load resistance
RL≤(Ue-12)/0.021
Output current of upper & lower
limit overflow alarm
IH=21mA, IL=3.8mA
Supply voltage
DC12-40V
Temperature drift
0.0075%FS/℃
Response time
1s (up to 90% of the final value )
Used environmental temperature
-40～80℃
Storage temperature
-40～100℃
Insulation strength (between input
and output)
1500Vrms (1 min, without spark)
Insulation resistance (between
input and output)
≥100MΩ(under the 500 VDC)
Vibration resistance
4g/2～150Hz
Installation angle
Unlimited
Installation area
B-type top cassette installation
Electromagnetic compatibility
Conform to GB/T18268 industrial equipment application requirements
(IEC 61326-1)
Notes:
1. The above accuracy data was obtained by testing at an ambient temperature of 20 °C ± 2 °C.
2. The output precision “%” is relative to the set range.
3. The cold end compensation error needs to be added to the thermocouple measurement, and the internal
cold end compensation error is ≤±1°C.
Input Type and Transmission Accuracy
Model
Type
Measurement
scope
Minimum
measurement scope
Conversion
accuracy
Resistance
Temperature detector (RTD)
Pt100
-200～850℃
20℃
±0.1%range Or±0.2℃
Cu50
-50～150℃
20℃
±0.1%range Or±0.2℃
Thermocouple (TC)
B
100～1820℃
500℃
±0.1%range Or±1.5℃
E
-100～1000℃
50℃
±0.1%range Or±0.5℃
J
-100～1200℃
50℃
±0.1%range Or±0.5℃
K
-180～1372℃
50℃
±0.1%range Or±0.5℃
N
-180～1300℃
50℃
±0.1%range Or±0.5℃
R
-50～1768℃
500℃
±0.1%range Or±1.5℃
S
-50～1768℃
500℃
±0.1%range Or±1.5℃
T
-200～400℃
50℃
±0.1%range Or±0.5℃

May 2023 3 www.wtsensor.com
Appearance Structure Diagram ( mm)
Installation Schematic Diagram
Configuration Schematic Diagram

May 2023 4 www.wtsensor.com
Wiring Diagram
How to order
PCT381 - Pt100 or B
Wotian reserves the right to make any change in this publication without notice. The information provided is
believed to be accurate and reliable as of this product sheet.
Contact us
Nanjing Wotian Technology Co.,Ltd.
Website: www.wtsensor.com
Add: 5 Wenying Road, Binjiang Development Zone, Nanjing, 211161, China
E-mail:[email protected]m
Product model
PCT381
Resisitance temperature
detector (RTD)
Pt100
Cu50
Thermocouple (TC)
Refer to “Thermocouple
(TC)” on Page 2