Features of PT100 Sensor Probe Assembly Accessories

The pt100 temperature sensor is an instrument that converts temperature variables into a transmittable standardized output signal. Mainly used for measurement and control of temperature parameters in industrial processes. A transmitter with a sensor usually consists of two parts: the sensor and the signal converter. The sensor is mainly a thermocouple or a thermal resistor; the signal converter is mainly composed of a measuring unit, a signal processing and a conversion unit (since industrial thermal resistors and thermocouple scales are standardized, signal converters are also called Transmitter), some transmitters have added display units, and some also have fieldbus functions.

Features of PT100 sensor Probe Assembly

Output signal of pt100 temperature sensor
If the pt100 temperature sensor is composed of two sensors used to measure the temperature difference, there is a given continuous functional relationship between the output signal and the temperature difference. There is a given continuous functional relationship between the pt100 temperature sensor output signal and the temperature variable (usually a linear function). The early production of PT100 temperature sensor has a linear functional relationship between its output signal and the resistance value (or voltage value) of the temperature sensor. The standardized output signals are mainly DC signals of 0mA~10mA and 4mA~20mA (or 1V~5V). Other standardized output signals with special provisions are not excluded. Temperature transmitters can be divided into two-wire systems and four-wire systems according to the power supply wiring method. The transmitters include electric unit combination instrument series (DDZ-Ⅱ type, DDZ-Ⅲ type and DDZ-S type), miniaturized modular type and multi-functional intelligent type. The former does not have a pt100 temperature sensor, and the latter two types of transmitters can be easily combined with thermocouples or thermal resistors to form a sensor-equipped transmitter.

Selection of PT100 sensor wiring harness

Measurement method of pt100
Constant current and constant voltage method
In traditional instrumentation, this method is generally used. After constructing the constant current or constant voltage method, use Ohm’s law to calculate the resistance value of Pt100, and then query the graduation table to obtain the temperature. This method is the simplest and most versatile.
Universal Sensor Interface UTI method
Although the traditional method is simple, it has many shortcomings. Using a universal sensor interface chip, only a temperature-insensitive reference resistor is required. By connecting Pt100 to the UTI circuit, the ratio between Pt100 and the reference resistor can be obtained through the MCU, thereby obtaining the resistance value and temperature. This approach works well for microprocessor (MCU)-based systems. All UTI information is output only through an MCU-compatible signal, which greatly reduces external wiring and couplers between discrete modules.
a) Wiring diagram for connecting 1 Pt100__
b) Wiring diagram for connecting 2 to 3 Pt100_______
c) Wiring diagram for connecting 8 Pt100__