U type thermocouple matters needing attention

U type thermocouple is a kind of special converts electrical energy into heat energy of the electrical components. It was based on the metal pipe of the shell ( Including stainless steel, copper tube) Along the tube center axial uniform spiral electric thermal bonding wire ( Nickel, chromium, iron chromium alloy) The gap filling compaction with good thermal conductivity of insulating oxide magnesia, with silicone seal on both ends of the tube, the metal armoured electric heating element to heat the air, metal molds and all kinds of liquid. Air relative humidity is not more than 95%, explosive and corrosive gas. Working voltage should be not greater than 1 rating. 1 times, shell should be effectively grounded. Insulation resistance 1 m or more Ω dielectric strength: 2 kv / 1 min.

2, thermocouple should be fixed positioning, effective heating area must be completely immersed in liquid or solid metal, it is strictly prohibited to empty it. Found a scale or carbon tube body surface, should be timely clean * * to use, so as to avoid absence made the cooling and shorten service life.

3, heating fusible metal or solid nitrate, alkali, asphalt, paraffin, etc. , should be used to reduce voltage, after being medium melt, can rise to the rated voltage.

4, uniform heating air element should cross arranged, make the element has good heat dissipation conditions, make the air flow can be fully heated.

5, heating security measures should be considered when nitrate, preventing explosion accidents.

6, connection parts should be on the outside of the insulation layer, avoid contact with corrosive, explosive medium, water; Lead connection should be able to long-term bear part of the temperature and heating load, the connection screw fastening should avoid too hard.

7, components should be stored in a dry place, if long-term placed below 1 m Ω insulation resistance, can be in around 200 ℃ oven drying, or lower voltage electric heat, until the insulation resistance.

8, U type thermocouple for the magnesium oxide powder, the use place to avoid contamination and moisture infiltration, prevent leakage accidents.