Integrated explosion-proof thermal resistance

Integrated explosion-proof thermal resistance and display instruments, recording instruments, electronic computers and other ancillary use, the output of 4 ~ 20mA. Direct measurement of liquid, steam and gas medium and solid surface temperature in the range of 0 to 1800.

Integrated explosion-proof thermal resistance of the output for a unified 4 ~ 20mA signal can be used in matching with the computer system or other conventional instruments. Also can be user requirements into the flameproof or flameproof type measuring instrument with temperature transmitter thermal resistance, also known as integrated explosion-proof thermal resistance, explosion-proof integrated thermal resistance is refers to the thermal resistance of waterproof or flameproof junction box arranged in the amplifying transmission module (i.e. temperature transmitter), and sensor connected into integration and output standard 4-20mA current signal or also can output 0-5V or 1-5V voltage signal. Usually and display instruments, recording instruments, electronic computers and other ancillary use, direct measurement of a variety of production processes in the 0 degree -500 degree range of liquid, steam and gas media and solid surface temperature.

The temperature transmitter is composed of the reference source, the cold end compensation, the amplifying unit, the linearization processing, the V/I conversion, the broken even processing, the reverse connection protection, the current limit protection and so on. It is the resistance of the thermal resistance generated by the cold end compensation, and then cap by the linear circuit to eliminate the resistance and temperature of the nonlinear error, the final amplifier is converted to 4 ~ 20mA current output signal. In order to prevent the accident caused by the failure of the temperature control in the measurement of the thermal resistance, a power down protection circuit is also arranged in the transmitter. When the thermal resistance wire is broken or the connection is bad, the transmitter outputs the maximum value (28mA) in order to cut off the power supply. Temperature transmitter module for 24V power supply, three wire system or the integration of the thermal resistance. Products imported integrated circuit, the thermal resistance of the signal amplification, and converted into a 4-20mA output current, or 0 ~ 5V output voltage. The armoured transmitter can be directly measured gas or liquid temperature especially in low temperature measuring range, to overcome the influence of the condensed water on the measurement of temperature.

characteristic

Second line system output 4-20mA, strong anti-interference ability, save the compensation wire and installation temperature transmitter cost, safe and reliable, long service life; cold end temperature automatic compensation, nonlinear correction circuit;

working principle

Thermocouple (thermal resistance) under the working state of the measured thermoelectric potential (resistance) of the changes, through temperature transmitter bridge unbalance signal generated, the amplified into 4-20mA to working instrument, instrument shows corresponding to the value of the temperature.

Explosion proof thermocouple (resistance) using the gap between the explosion principle, when the explosion occurred inside the cavity, through the joint surface clearance and cooling off, so that the flame and the temperature can not be passed outside the chamber, so as to carry out temperature measurement. Thermocouple (resistance) of the thermopower (resistance) after the bridge temperature transmitter produce unbalance signal. After amplifying conversion become 4-20mA DC signal to the instrument, the instrument shows the corresponding temperature values.