Battery powered field display thermocouple

The battery-powered field display thermocouple is a high-precision temperature transmitter based on thermal resistors, thermocouple resistors, electrical signal input, thermal resistor Pt100 signal input, two-wire 4-20mA analog output, supporting HART protocol, online adjustment through PC programming, B-type top box installation, and multiple certifications. Battery-powered field display thermocouples are based on thermocouples/thermal resistors to increase temperature transmission functions or additional field display functions, that is, the temperature transmitter module is added to the junction box of the original thermocouple/thermal resistor and the installation display header using the field display junction box.
Structure:
Thermocouple (resistance) temperature transmitter consists of thermocouples or thermal resistors and transmitter parts.

Thermocouples include important parts such as electric couple elements, protective tubes, and junction boxes: the junction boxes and protective tubes of the two are similar.

Thermocouple elements are composed of armored thermocouples; thermocouple elements are composed of armored platinum resistors.

Protection tube: It is required to be resistant to low temperature and corrosion, able to withstand rapid temperature changes, with good airtightness and sufficient mechanical strength. It is now made of two different brands of stainless steel.

The junction box is made of aluminum alloy, waterproof, and has a protection level of IP54

Transmitter components: It consists of a shell, a cover plate, circuit terminals, etc., and is sealed in the shell with silicone rubber, so it cannot be assembled.

Working principle:

Thermocouple element array adjustment divides each port into multiple output arrays, and the arrays are adjusted in turn to ensure that each array has a certain service time. A weighted value can be set for each array (in order of w3, w2, w1, w0), and the weighted value represents the proportion of the acquisition resources. For example, for a 100M port, the weighted values ​​of its WRR queue scheduling algorithm are set to 50, 30, 10, 10 (corresponding to w3, w2, w1, w0, respectively). This ensures that the lowest priority queue obtains at least 10Mbit/s bandwidth, avoiding the problem that the messages in the low priority queue may not be served for a long time when PQ scheduling is adopted. Another advantage of WRR queue is that although the scheduling of multiple queues is carried out in round-robin, the service time slice is not fixedly allocated for each queue - if a queue is empty, it will immediately switch to the next queue for scheduling, so that bandwidth resources can be fully utilized.