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No. 16 Xingye West Road, Mawei High tech Park, Fuzhou, China
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Fujian Shangrun Precision Instrument Co., Ltd
303 RS485 intelligent temperature transmitter
NegotiableUpdate on 04/13
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Overview
The temperature of the industrial site is input to the 303X through a thermistor or thermocouple sensor, and after analog-to-digital conversion, it is converted into the corresponding digital quantity by the microprocessor. The digitized temperature value is sent to the high brightness LCD for real-time display, and can also be transmitted to the main control device through the RS485 bus. The RS485 protocol enables convenient remote parameter setting and debugging of the transmitter.
Product Details
Technical Parameter
input
sensor type
303A/B1: Pt100,Pt1000,Cu50,Cu100
303A/B2: S,R,B,K,N,E,J,T,WRe3-25
303A/B3: Pt100,Pt1000,Cu50,Cu100，S,R,B,K,N,E,J,T,WRe3-25
Accept user specifications
Connection method
303A/B1: A two, three, or four wire heating resistance sensor
303A/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 a thermistor sensor. The built-in thermistor sensor of the transmitter can also be used for cold junction compensation (the compensation accuracy will affect the final measurement accuracy)
303A/B3: Adopt 303A/B1 or 303A/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
measurement accuracy
Digital measurement accuracy
See Appendix 1: List of Input Sensor Types and Accuracy
Long-term Drift
First year<0.035% full scale
Temperature influence
See Appendix 2: Effects of Environmental Temperature
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
1.3kg (excluding temperature sensor)
Cable sealing pipe connection thread
M20 × 1.5 Other threads require adapter
Sensor connection
Integrated
split type
size
See Appendix 3: Dimensional Drawing of Two Wire Intelligent Temperature Transmitter
Display and Control
Display Size
33×23mm
Display digits
5 people
Unit (switchable)
℃ or ℉
set an option
Three buttons on the panel or PC
power supply
+24V DC ±5%
Certificates and approvals
Explosion proof type
ExdⅡCT6
Intrinsically safe type
ExiaⅡCT6
communication interface
RS485 Modbus RTU
Transmitter factory settings
sensor
Pt100 or B-type thermocouple or as specified by the customer
sensor offset
0℃
damping
0.0S
The transmitter based on RS485 communication protocol can provide high-speed, long-distance, and highly reliable temperature acquisition.
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.
The built-in three operation buttons allow for convenient parameter settings, and the transmitter can also be parameterized through the RS485 bus.
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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