Overview:

SBWRThermocouple temperature transmitterSBWZThermal resistance temperature transmitter is a field installed temperature transmission unit in temperature measurement thermocouples and thermal resistors. It adopts a two-wire transmission method (two wires as power input and a common transmission line for signal output). Transform thermocouple and thermistor signals into linear signals with the input electrical signal or measured temperature4~20mAThe output signal of the transmitter can be installed in the junction box of thermocouples and thermal resistors to form an integrated structure. As a new generation of temperature measuring instrument, it can be widely used in industrial sectors such as metallurgy, petrochemicals, power, light industry, textiles, food, national defense, and scientific research.

1 Characteristics of temperature transmitter

1 Adopting an epoxy resin sealing structure, it is earthquake resistant, temperature resistant, and suitable for installation in harsh on-site environments Use it.

2 Installed on-site in the junction box of thermistor and thermocouple, directly outputting4~20mAor0-5Vor0-10VThis not only saves expensive compensation wire costs, but also improves the anti-interference ability during long-distance signal transmission.

3 High precision, low power consumption, wide temperature range for use, stable and reliable operation.

4 The range is adjustable and has a linearization correction function. The thermocouple temperature transmitter has a cold end automatic compensation function.

Widely applicable, it can form an integrated on-site installation structure with thermocouples and thermistors, and can also be installed as a functional module in testing equipment.

II Main technical indicators:

1 Input: ThermistorPt100TheCu50TheCu100

thermocoupleKTheETheSTheBTheTTheJTheN

2 Output: Output within the range of measurement4~20mAor0-5Vor0-10VThe signal can be linear with the output resistance signal of the resistance thermometer and linear with the input temperature signal of the resistance thermometer; It can be linear with the millivolt signal input by the thermocouple, or linear with the temperature signal input by the thermocouple thermometer.

3 Basic error: ±0.2%、 ±0.5%

4 Transmission method: two-wire system

Transmitter working power supply voltage12V-35VRated working voltage24V.

6 Load: The maximum load resistance is calculated according to the following formula

RL（max）=50×（Vmm-12）

(namely24VThe load resistance can be0~600Select within the range of Ω)rated load250Oh.

Note: The range adjustable transmitter requires repeated debugging of zero and full scale when changing the range; The thermocouple type transmitter needs to be preheated before debugging30minute

7 Environmental temperature impact ≤0.05%1℃

8 Normal working environment:

a、 ambient temperature-25℃~+80℃

b、relative humidity5%~95%

c、 mechanical vibrationf≤55Hzamplitude<0.15mm.

III Model and category:

4 signal isolator

1 SBWZ/RThe series of signal isolators are mainly related toDCSThePLCTo be used in conjunction with industrial measurement and control systems to improve and supplement system simulationI/OPlugin functionality increases system applicability and reliability in on-site environments. This product is designed according to international electromagnetic compatibility standards and adopts modulation transformer isolation technology in the same industry internationally to achieve mutual isolation of input, output, and power supply. In the internal circuit design of the module, based on low-power and low-temperature drift technology, high-quality components are used to ensure long-term stable operation of the product. At the same time, the product is equipped with input protection, interference suppression, isolation and other functions.

2 Technical Specifications

Measurement accuracy: ±0.5F·S%Or ±0.2F·S%

Input signal: various DC linear signals

Output signal: One in one out or one in two out

Working power supply:DC24V

Work environment:0~50℃Relative temperature ≤85%No corrosive gas, no strong vibration occasions.

Input impedance:230Ω+Output load resistance

Output load resistance:50~500Ω

partition Isolation between input, output, and power supply

Insulation resistance: ≥ between power supply, input, and output terminals100MΩ

Insulation strength: between power supply, input, and output terminals1000VDC/minute

5 Calibration steps for thermocouple temperature transmitter

1 When verifying, connect a potential difference meter at the input end, output the signal as electromotive force, and connect it at the output end24VDCStabilize the power supply and connect it in series with a standard ammeter.

2 Zero adjustment: Connect the signal input line in reverse to enable the potentiometer to output the electromotive force corresponding to the room temperature at the calibration site, and adjust the potentiometerZMake the ammeter read as4mA.

3 Full adjustment: Connect the positive signal input line to enable the potentiometer to output the corresponding electromotive force at full range, and adjust the potentiometerSMake the ammeter read as20mAThe electromotive force is the value obtained by subtracting the electromotive force corresponding to room temperature from the full degree electromotive force

Example: At the inspection site, the room temperature is7℃The input signal isKThe range is0~1000℃The calibration of the temperature transmitter was determined by checking the table7℃The corresponding electromotive force is0.277mV，1000℃The corresponding electromotive force is41.269mVAfter reverse connection, the potential difference meter outputs0.277mVAdjust the potentiometerZMake the ammeter read as4mAThe output reading of the potentiometer after positive wiring is40.992mV（41.269mV~0.277mV）Adjust the potentiometerSMake the ammeter read as20mA.

VI Verification steps for thermistor temperature transmitter

1 When calibrating, follow the typical wiring diagram above and connect the standard resistance box (such asZX-25a）Connect it to the output terminal24VDCStabilize the power supply and connect it in series with a standard ammeter.

2 Change the signal source generator (resistor box) to the lower limit of the range, and adjust the potentiometerZMake the reading of the ammeter be4 mAChange the signal source to the upper limit of the range and adjust the potentiometerSMake the reading of the ammeter be20 mAJust enough.

Example: The input model isPt100The range is0~100℃The temperature transmitter. After correct wiring, the resistance box outputs100Ω, adjust the potentiometerZMake the ammeter read as4 mAThe output reading of the resistance box is138.50Ω(Instant resistance in100℃The resistance value corresponding to the time)Adjust the potentiometerSMake the reading of the ammeter be20 mA.