Description
Product introduction:
SBWZ-2460, SBWR-2080, SBWR-2081, SBWR-2180, SBWR-2181, SBWR-2280, SBWR-2281, SBWR-2380, SBWR-2381, SBWR-2480, SBWR-2481, SBWR-2580, SBWR-2581, SBWR-2880, SBWR-2881, SBWR-2060 temperature transmitter uses a thermocouple and a thermal resistor as temperature measuring components, and sends the signal from the temperature measuring component to the transmitter module. After voltage regulation filtering, operational amplification, nonlinear correction, V/I conversion, constant current and reverse After protection and other circuit processing, it is converted into a 4-20 mA current signal 0-5V/0-10V voltage signal linearly related to temperature, RS485 digital signal output.
Working principle:
A device that converts a physical measurement signal or a normal electrical signal into a standard electrical signal output or that can be output as a communication protocol. A temperature transmitter is a meter that converts temperature variables into a standardized output signal that can be transmitted. It is primarily used for measurement and control of industrial process temperature parameters. The current transmitter converts the AC current of the main circuit under test into a constant current loop standard signal and continuously delivers it to the receiving device.
The temperature-current transmitter converts the signal of the temperature sensor into a current signal and connects it to the secondary meter to display the corresponding temperature. For example, if the model of the temperature sensor is PT100, then the function of the temperature current transducer is to convert the resistance signal into a current signal, input the meter, and display the temperature.
Technical parameter:
1, thermocouple temperature transmitter technical indicators
※Input
Input type: K, E, S, B, T, J and other types of thermocouple
Temperature range: (as shown below)
Input impedance: ≥20KΩ
Cold junction temperature compensation: -15 ~ +75 ° C
※Output
Output current: 4 ~ 20mA
Output loop power supply: 12 ~ 30VDC
Minimum working voltage: 12VDC
The relationship between load resistance and power supply:
※ Comprehensive parameters
Standard accuracy: ±0.2%
Temperature drift: basic error / 10 ° C
Thermal resistance lead compensation: ±0.1% (0~10Ω)
Load change effect: ±0.1% (within the allowable load range)
Power supply variation: ±0.1% (12~30V)
Boot response time: <1S (0~90%)
Working environment temperature: -20 ~ +70 ° C
Protection level: IP00/IP54 (determination of sensor protection level)
Electromagnetic compatibility: in accordance with IEC61000, EN61000
2, thermal resistance temperature transmitter technical indicators
※Input
Temperature range: Pt100: -200 ~ 850 °C Cu50: -50 ~ 150 °C
Minimum temperature range: 50 ° C
Lead resistance: ≤10Ω
※Output
Output current: 4 ~ 20mA
Output loop power supply: 12 ~ 30VDC
Minimum 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 precision is required
Temperature drift: basic error / 10 ° C
Thermal resistance lead compensation: ±0.1% (0~10Ω)
Load change effect: ±0.1% (within the allowable load range)
Power supply variation: ±0.1% (12~30V)
Boot response time: <1S (0~90%)
Working environment temperature: -20 ~ +70 ° C
Protection level: IP00/IP54 (determination of sensor protection level)
Electromagnetic compatibility: in accordance with IEC61000, EN61000
Precautions:
The power supply of the temperature transmitter must not have spikes, otherwise the transmitter may be damaged. The calibration of the transmitter should be performed after 5 minutes of power up, and pay attention to the ambient temperature at that time. When measuring high temperature (>>100 °C), the filler material is isolated between the sensor cavity and the junction box to prevent the junction box from being overheated and the transmitter is burned out. In the case of severe interference, the sensor should be grounded to avoid interference. The power supply and signal output should be transmitted with Ф10 shielded cable. The crimping nut should be tightened to ensure air tightness. Only the RWB type temperature transmitter has a 0~10mA output, which is a three-wire system, which is less than 5% of the range value, and is not linear due to the turn-off characteristics of the triode. The temperature transmitter should be calibrated every 6 months. If the DWB cannot be linearly corrected due to circuit limitations, it is best to follow the instructions to select the range to ensure linearity.
