WRNK-302 Armored Thermocouple Shanghai Automation Instrument Factory 3

WRNK-302 Armored Thermocouple Shanghai Automation Instrument Factory 3

The thermoelectric potential of the armored thermocouple will increase with the temperature rise at the measuring end. The magnitude of the thermoelectric potential is only related to the material of the armored thermocouple conductor and the temperature difference between the two ends, and is independent of the length and diameter of the thermoelectric electrode.

working principle

The working principle of armored thermocouples is to weld two conductors with different compositions at both ends to form a circuit. The direct temperature measuring end is called the measuring end, and the wiring end is called the reference end. When there is a temperature difference between the measuring end and the reference end, a thermal current will be generated in the circuit. When connected to a display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric potential generated by the thermocouple.

The structure of armored thermocouples is made up of conductors, insulated magnesium oxide, and 1Cr18Ni9Ti stainless steel protective tubes that have been drawn multiple times. Armored thermocouple products mainly consist of junction boxes, terminal blocks, and armored thermocouples, and are equipped with various installation and fixing devices.

Armored thermocouples are divided into two types: insulated and shell connected.

WRNK-302 Armored Thermocouple Shanghai Automation Instrument Factory 3Main technical indicators

Temperature measurement range and accuracy

Note: 1) t is the value of the measured temperature.

2) The production of T-shaped dividing marks requires negotiation and ordering with the manufacturer.

Armored thermocouple thermal response time

When there is a step change in temperature, the output of the thermocouple changes to 50% of the step change, and the time required is called the thermal response timeT0.5express

The thermal response time of armored thermocouples shall not exceed the specifications in the following table:

insulation resistance

When the ambient air temperature is 20 ± 15℃When the relative humidity is not greater than 80%, the insulation resistance value between the thermocouple wire and the outer sleeve of the insulated armored thermocouple should comply with the provisions in the following table.

Model representation

Standard specifications for outer diameter and nominal length of armored thermocouples

Note: 1. The nominal L of the insulated armored thermocouple with a diameter of Φ 3mm shall not exceed 10000mm

2. Armored thermocouples with a diameter of d ≤ Φ 5mm and equipped with splash proof or waterproof junction boxes. The thermocouple is exposed from the equipment, and users must install auxiliary supports such as brackets to increase its rigidity, ensure fastening, and prevent the junction box from shaking and damaging the thermocouple due to vibration.

3. The armored thermocouple with a diameter of Φ 2mm must be ordered through negotiation with our factory.