SBWR-2480 Hart protocol integrated temperature transmitter

SBWR-2480 Hart protocol integrated temperature transmitter

Introduction:

Composed of a temperature sensor and a signal converter, the signal converter is installed in the cold junction box of the temperature sensor, directly converting the voltage and resistance signals detected by the temperature sensor into 4-20mA current output. Convert the temperature signal within the range of -200~+1600 ℃ into a two-wire 4-20mA DC electrical signal in a very simple way, and transmit it to display instruments, regulators, recorders, DCS, etc., to achieve accurate measurement and control of temperature.

SBWR-2480 Hart protocol integrated temperature transmitter

Type principle
The integrated temperature transmitter generally consists of a temperature measuring probe (thermocouple or thermistor sensor) and a two-wire solid-state electronic unit. The temperature probe is directly installed in the junction box in the form of a solid module, forming an integrated transmitter. Integrated temperature transmitters are generally divided into two types: thermistor and thermocouple.
The thermal resistance temperature transmitter is composed of a reference unit, R/V conversion unit, linear circuit, reverse protection, current limiting protection, V/I conversion unit, etc. After the thermal resistance signal is converted and amplified, the non-linear relationship between temperature and resistance is compensated by a linear circuit. After the V/I conversion circuit, a constant current signal of 4-20mA is output, which is linearly related to the measured temperature.
A temperature transmitter generally consists of circuit units such as a reference source, cold end compensation, amplification unit, linearization processing, V/I conversion, disconnection processing, reverse connection protection, and current limiting protection. It amplifies the thermoelectric potential generated by the thermocouple through cold junction compensation, then eliminates the nonlinear error between thermoelectric potential and temperature through a linear circuit, and finally amplifies and converts it into a 4-20mA current output signal. To prevent accidents caused by temperature control failure due to thermocouple wire breakage during thermocouple measurement, the transmitter is also equipped with a power-off protection circuit. When the thermocouple breaks or is poorly connected, the transmitter will output the maximum value (28mA) to cut off the power supply of the instrument.
The integrated temperature transmitter has the advantages of simple structure, wire saving, large output signal, strong anti-interference ability, good linearity, simple display instrument, solid module seismic and moisture-proof, reverse connection protection and current limiting protection, and reliable operation.
The output of the integrated temperature transmitter is a unified 4-20mA signal; Can be used in conjunction with microcomputer systems or other conventional instruments. Users can also request to make explosion-proof or fireproof measuring instruments.
The SBW series temperature transmitter module is a 24V powered, two-wire integrated transmitter. The product adopts imported integrated circuits to amplify the signals of thermal resistors or thermocouples and convert them into 4-20mA output current or 0-5V output voltage. The armored transmitter can directly measure the temperature of gases or liquids, and is particularly suitable for low-temperature range measurement, overcoming the influence of condensed water on temperature measurement
feature

Ultra small (module diameter 44 × 18) integrated, with strong versatility

Two line system with 4-20mA DC output. Long transmission distance and strong anti-interference ability.

Cold end, temperature drift, non-linear automatic compensation.

High measurement accuracy and good long-term stability.

The temperature module adopts epoxy resin casting technology internally, which is suitable for use in various harsh and dangerous places.

Integrated design, simple and reasonable structure, can directly replace ordinary assembled thermocouples and thermistors.

Mechanical protection IP65.

Using thermocouple temperature change can eliminate the need for compensating wires and reduce costs

Various indication functions such as LCD, digital display, pointer, etc. facilitate timely monitoring on site.

When the on-site ambient temperature is above 70 ℃, the transmitter and on-site display instrument can be installed separately (isolated)

Explosion proof rating: dIIBT4, dIIBT5.

Protection level: IP54