MST280 thermistor two-wire temperature transmitter (isolated type)

MST280 thermistor two-wire temperature transmitter (isolated type)

I. Overview
MST-280 two-wire heating resistor temperature transmitter. Used for Pt100 or Cu50 thermistor input, with a standard DC current signal of 4-20mA output through transmission
The two-wire system (where the power supply and signal output are shared by two wires) has a linear relationship between the output current and the measured temperature, with an accuracy of ≤ 0.2%. The integrated structure is installed inside the standard junction box of the temperature sensor. It can also be installed separately in the dashboard as a conversion unit, and can be used in conjunction with digital display instruments, recording instruments, regulators, and DCS systems to form various temperature measurement and control systems.
This thermistor temperature transmitter has a small volume, compact structure, modular meter core design, low power consumption, and high conversion accuracy. Strong anti-interference ability and good long-distance transmission performance. Passed CE certification.

2、 Characteristics
◇ Thermal resistance Pt100 or Cu50 input
◇ Isolation type two-wire system, 4-20mA output
◇ Equipped with output signal zero and full potentiometer adjustment
◇ High precision conversion, linearization correction
◇ Electromagnetic isolation between input and output
◇ Unified exterior structure, small size and light weight
Suitable for installation inside standard temperature sensor junction boxes
◇ It can also be installed separately as a signal conversion unit in the dashboard

3、 Selection and ordering code

Note: Special types not listed can be specified for ordering.
2. The two columns of basic error and ****** error listed in the table above should be taken as the basic error when applied, with ****** exceeding the maximum value.

4、 Technical parameters
※ Input
Temperature range: Pt100: -200~850 ℃ Cu50: -50~150 ℃
***Temperature range: 50 ℃
Lead resistance: ≤ 10 Ω
※ Output
Output current: 4-20mA
Output circuit power supply: 12-30VDC
***Small working voltage: 12VDC
The relationship between load resistance and power supply:
Load resistance (including lead resistance)=Power supply (V) -12 (V)/0.02A
※ Comprehensive parameters
Standard accuracy: ± 0.2% (see selection table) Note: High accuracy is required and can be customized
Temperature drift: Basic error/10 ℃
Thermal resistance lead compensation: ± 0.1% (0-10 Ω)
Load variation impact: ± 0.1% (within the allowable load range)
Power supply variation impact: ± 0.1% (12-30V)
Power on response time: ＜ 1S (0-90%)
Working environment temperature: -20~+70 ℃
Protection level: IP00/IP54 (determined by sensor protection level)
Electromagnetic compatibility: compliant with IEC61000, EN61000
External dimensions (see external dimension diagram): φ 44 × 20 (mm)
Whole machine weight: approximately 30 grams

5、 Standard size

6、 Wiring diagram