Used in industrial control instrument, many different kinds of the transducer, transmitter are mainly temperature transmitter
, pressure transmitter, flow transmitter, current transducer, voltage transducer, and so on.
Transmitter in instruments, meters and plays an important role in industrial automation field.
Unlike sensor, transmitter in addition to convert non-electricity into measurable quantity, general also has certain effect.
Pressure transmitter, pressure transmitter also calls the difference transmitter, mainly by the load cell sensor, module circuit and display meter, watchcase and process fittings, etc.
It can will receive such as gas, liquid pressure signal into standard current voltage signal, in order to supply instructions alarming device, recorder, controller and other secondary instrument measurement, instructions and process adjustment.
Pressure transmitter measuring principle is: the process pressure and reference, respectively applied to the ends of the integrated silicon pressure sensor, the differential pressure make the silicon wafer deformation (
Displacement is very small, only & mu;
Made of semiconductor technology, in order to make silicon including full dynamic wheatstone bridge in external driven by current source output voltage signal is proportional to the pressure of the mV level.
Due to the strong excellent silicon material, so the output signal of the linearity and variation are very high.
Work, pressure transmitter to physical quantity being measured into the mV level of voltage signal, and sent to a high magnification and can cancel each other out temperature drift of a differential amplifier.
After amplification of the signal by voltage current transform into the corresponding current signal, again through the nonlinear correction, and finally with the input pressure into the standard linear relation between the current voltage signal.
Pressure transmitter according to the pressure range can be divided into general pressure transmitter (
And differential pressure transmitter (
0 ~ 30 kpa)
Integrated temperature transmitter, integrated temperature transmitter by temperature measuring probe (commonly
The thermocouple or heat resistance sensor)
And the two wire system solid electronic units.
In the form of solid module temperature measuring probe directly installed on the terminal box, thus forming the integration of the transducer.
Integrated temperature transmitter with thermal resistance and thermocouple generally fall into two types.
Heat resistance temperature transmitter is the R/V conversion unit, the benchmark unit, linear circuit, reverse connect protection, current limiting protection, V/I conversion unit, etc.
Measuring temperature resistance signal amplification, and then by linear circuit of temperature compensate nonlinear relationship with the resistance, after the V/I conversion circuit outputs a measured a linear relationship with temperature and constant current signal of 4 ~ 20 ma.
Thermocouple temperature transmitter by the reference source, cold junction compensation, amplifier unit, linearization, V/I conversion, broken accidentally processing, reverse connect protection, current limiting circuit protection units.
It is the cold junction compensation of thermocouple thermoelectric potential enlarged, cap again by linear circuits eliminate the nonlinear error of thermoelectric potential and temperature, the final amplification into 4 ~ 20 ma current output signal.
In order to prevent the thermocouple measurement by thermocouple wire break and make the temperature control failure caused by accident, transmitter will also include a power protection circuit.
When the thermocouple wire break or pick up solution, transmitter will output the maximum value (
In order to make the instrument to cut off the power supply.
Integrated temperature transmitter has simple structure, saves the wire, big output signal, strong anti-interference ability, good linear, simple display instrument, solid module earthquake moisture-proof, reverse connection protection and current limiting protection, reliable work, etc.
The output of the integrated temperature transmitter for unification of 4 ~ 20 ma signal;
Can be used with microcomputer system or other conventional instrument match.
Can also be user requirements in explosion-proof type or fire type measuring instrument.
Liquid level transmitter
: 1, the ball float liquid level transmitter by magnetic float ball float liquid level transmitter, catheters, signal unit of measurement, electronic unit, junction box and install.
The proportion of general magnetic float less than 0.
5, can float on the surface and move up and down along the measuring tube.
Intraductal equipped with measuring element, it can will be under outer magnetic liquid level measurement signal is proportional to the resistance of the liquid level change signal, and converting electronic unit 4 ~ 20 ma, or other standard signal output.
The transmitter module circuit, has the advantages of acid, moisture, shock, anti-corrosion, internal circuit has permanently within the current feedback circuit and protect circuit, can make the output current is not more than 28 biggest ma, and thus can be reliably protect the power supply and the secondary instrument is damaged.
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