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Fujian Shangrun Precision Instrument Co., Ltd
302 two-wire intelligent temperature transmitter
NegotiableUpdate on 04/13
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Overview
The temperature of the industrial site is input to the 302X through a thermistor or thermocouple sensor, and after analog-to-digital conversion, it is converted into the corresponding digital quantity by the microprocessor. The digital quantity is proportionally converted into the corresponding 4-20mA signal output through digital to analog conversion and sent to the high brightness LCD for real-time display. The processor simultaneously monitors the sensor status, including short circuit and open circuit faults, which will be fed back to the main control unit through a 4-20mA signal. In addition, the system fault information of the transmitter can also be confirmed through the set current value (see the operation manual or technical parameters section for details).
Product Details
Technical Parameter
input
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 user specifications
Connection method
302A/B1: A two, three, or four wire heating resistance sensor
302A/B2: One thermocouple sensor and one thermistor sensor (three wire) are used for cold junction compensation, or a fixed cold junction temperature can be set for compensation without the thermistor sensor. Alternatively, the built-in thermistor sensor of the transmitter can be used for cold junction compensation (compensation accuracy and final measurement accuracy)
302A/B3: Adopt 302A/B1 or 302A/B2 connection method according to requirements
measuring range
See Appendix 1: List of Input Sensor Types and Accuracy
response time
≤ 250ms with sensor for short circuit and open circuit monitoring
output
Two wire system 4-20mA
Load resistance Ra
Ra ≤ (Us-14.7V)/0.024A, Us is the loop voltage
sensor fault
Short circuit: Accept user specified (3.5～3.75mA)
Open circuit: Accept user specified (21)～23mA)
system failure
Can be set to 3.2mA or 24mA
measurement accuracy
Accuracy (digital measurement accuracy)
See Appendix 1: List of Input Sensor Types and Accuracy
Analog output accuracy
0.025% full scale
Long-term Drift
The first year is less than 0.2% of full scale
Temperature influence
See Appendix 2: Effects of Environmental Temperature
Power supply impact
<0.001% full scale/V
Influence of load impedance
<0.025% full scale/100 Ω
rated operation conditions
ambient temperature
-40～85℃ -20～60 ℃ (explosion-proof type)
condensation
allow
electromagnetic compatibility
GB/T 17626， three-level
Protection level according to EN 60529
IP67
design
casing
Aluminum die-casting parts
weight
1kg (excluding temperature sensor)
size
See Appendix 3: Dimensional Drawing of Two Wire Intelligent Temperature Transmitter
Cable sealing pipe connection thread
M20 × 1.5 Other threads require adapter
Sensor connection
Integrated
split type
Display and Control
Display Size
33×23mm
Display digits
5 people
Unit (switchable)
℃ or ℉
set an option
The three buttons on the panel
power supply
15～36V DC
Electrical isolation
Ueff=1kV, 50Hz, 1min between input and output
Certificates and approvals
Explosion proof type
ExdⅡCT6
Intrinsically safe type
ExiaⅡCT6
Transmitter factory settings
sensor
Pt100 or B-type thermocouple or as specified by the customer
sensor offset
0℃
damping
0.0S
Two wire transmitters based on current loop power supply can effectively reduce wiring costs, lower power consumption, and improve anti-interference capabilities
4-20mA output with multiple fault information feedback capabilities
When connected to a thermistor sensor, it has short-circuit and open circuit monitoring functions, and when connected to a thermocouple sensor, it has open circuit monitoring functions.
By using the built-in 3 operation buttons in conjunction with a high brightness LCD display, it is easy to set transmitter parameters locally.
The rotatable LCD display enhances the flexibility of transmitter installation and can display real-time information such as the percentage of the current measurement to full scale, the current measurement value and its unit, as well as sensor type and transmitter diagnostic information.
The enclosure has a protection level of IP67 and is suitable for outdoor applications
• Supports all sensors that comply with IEC751 and IEC584
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