485 the industry guidelines of alternating current temperature sensor manufacturer 'this information effectively for a long time'

How to improve the current temperature sensor measurement accuracy?

in addition to the installation of wiring, and pay attention to the temperature sensor calibration calibration, working environment, through the following methods can improve the accuracy of measurement:

1, the original edge wire should be placed in the center of the temperature sensor inner hole, as far as possible, don't put the partial;

2, the original wire completely with temperature sensor inner hole as far as possible, don't leave gaps;

3, need to measure up to the current temperature sensor standard rating IPN, don't vary too big. Such as conditions, only one hand rating high temperature sensor, and to measure the current value is lower than the rating of a lot of, in order to improve the accuracy of measurement, can put the original edge wire around a few laps, more close to the rating. For example when using rating 100 a temperature sensor to measure the current of 10 a, in order to improve the precision of the original edge wire can be in the center of the temperature sensor of inner hole around nine laps, Generally, NP = 1; Inside the hole around a circle, NP = 2; ……； Around nine laps, NP = 10, NP x 10 a = 100 a equals the rating temperature sensor, which can improve the precision of) ;

4, when to measure the current value of IPN / 5, at 25 ℃ still can have higher precision.

what are the current temperature sensor input and output connection mode?

（ 1) PCB pin welded installation: both on line, on circuit board will be welded on the circuit board, temperature sensor as a component. Its advantage is small size, light weight, saving space, easy to install.

（ 2) Screw fastening type installation: the temperature sensor with a screw on the bottom of the box or a fixed position, external connection is a variety of terminal lead connection. The optimal point is strong, convenient, easy to remove.

（ 3) Guide rail type installation: both at the bottom of the temperature sensor has a standard 35 mm wide dovetail groove, can be installed in a cassette. Its advantage is convenient, the versatility, suitable for field makes installation industry.

current temperature sensor in the application of motor

temperature sensors and motors, drives, controller a motion control system or drive system. Current temperature sensor is commonly used in motor drive and control of the temperature sensor, platinum spark plugs, the output signal is used as a function of protection, feedback, no temperature sensor in the motor control, the current temperature sensor is the indispensable element, the current signal is used to calculate the magnetic field physical quantities such as position and flux linkage and torque. In different kinds of motors even the same type but different in the number of motor drive, the location and type of temperature sensor are also different voltage temperature sensor, temperature sensor, the hall current ( voltage sensor) 。

the difference between the voltage transformer and current temperature sensor detection current

current transformer, is the primary side large current, in proportion to fit through the instrument or use the relay, rated current 1 a to 5 a or the transformation of equipment. Its working principle and the transformer is similar.

1, a winding and high voltage circuit in series, only depends on the high pressure loop current, which has nothing to do with the secondary load.

2, secondary loop is not allowed to open, otherwise it will produce dangerous high voltage, endangers one's personal and equipment safety.

3, secondary loop must have some grounding directly, prevent after the primary and secondary windings insulation breakdown of high voltage, but only a little ground.

the current temperature sensor has the advantage of this structure is simple, accuracy and linearity of the measurement result is higher. Measurable dc, ac and all kinds of current waveform. But its measuring range, such as bandwidth is limited by certain. In this application, hall device is magnetic field detector, it detects the magnetic core air gap of the magnetic induction intensity. After current increase, core may reach saturation; With increasing frequency, magnetic core in eddy current loss, hysteresis losses, etc. It will rise. These will have an effect on the measurement accuracy. Of course, also can take some improvement measures to reduce these effects, such as choosing high saturation magnetic induction intensity of magnetic core materials; Made from multilayer magnetic core; Multiple hall element is used to test and so on.