What are the wear-resistant thermocouple failure problem1

Wear-resistant thermal resistance as well as wear-resistant thermocouple are power plants circulating fluidized boiler, boiling boiler, coal mill powder gasification furnace and a series of cement kiln head, preheater, furnace hood and chemical, smelting, such as high temperature wear conditions are ideal for high tech products, wear-resistant thermal resistance eclecticism, adopt unique craft formula, the product produce wear-resistant alloy in the gaffe balance with ordinary stainless steel metal, metal ceramic protection tube, compared with the similar wear-resistant alloy protection tube on the market, and increase its service life 5 times. Due to environment temperature difference, high temperature control point, the vibration is larger, blower wind speed is too high, serious wear and tear, caused the temperature measurement is very difficult, life is very short, only 10 - general wear-resistant alloy 90 days to grind through damage, burn bent, broken, damaged thermal resistance, bring great damage to the user and unnecessary trouble, wear-resisting type thermocouple made up for this shortcoming.

wear-resistant thermocouple anti-scouring, wear-resistant thermal resistance after hundreds of manufacturers, the use of nearly ten thousand times a year, the reaction is very good, on many occasions with the strength of the leading peers, can with imported products wear-resistant thermal resistance with resistance to vibration, wear resistance, corrosion resistance, high sensitivity, good stability, high accuracy, long life and other advantages, is the power plants, cement plants, chemical plants, such as wear-resisting fields preferred temperature measuring protection tube.

wear-resistant thermocouple what problem is there?

1, the wear resistance of the thermocouple compensation wire insulation layer is worn out, causing signal circuit grounding. This is mainly because compensation conductor should be hard, but also in terminal box was not placed flat again, deal with failure many times met compensating lead screw terminal box cover and it is worn out. Such failures are reflected in the operator controls the temperature on the general value for small.

2, wear-resistant thermocouple compensating lead wires. Mainly infrastructure problems, responsible for connection of a moment of carelessness, artificial factor. When a thermocouple compensating lead wires connect the situations, the operator control site shows usually small or large than the actual value ( According to the channel measurement circuit and decide) 。

3, terminal box poor contact terminals. Because compensation conductor and thermocouple wires are hard, so it is difficult to on-site maintenance when fastening connection, sometimes come to the conductor and tightened the but over time as the deformation of the wire is loose. Such failures are reflected in the operator to control the temperature of the site for the value for no show or display value range.

4, compensation resistance fault. Such failures of thermocouple to temperature display value after slow rise or fall.

5, the tail of the boiler flue measuring thermocouple failure rate is higher. Down thermocouple will be removed when found thermocouple head including protective casing by flue gas flushing after serious wear and tear, will protect casing under wear resistant steel, to eliminate such problems.

6, the temperature of the input signal after the isolator failure, reflect on the operator control site temperature signal abnormalities. After replacement of isolator is normal. Above is often encountered when the maintenance problems, but in finding these failure, suggest to use multimeter in DCS on the ark of the IO terminal measurement input voltage value, so that we can quickly judge the in situ measurement issues or DCS part of the problem, for more input can also be compared with several other thermocouple signal. Such as judgment is not the solution of any line measuring the resistance value, usually wear resistance value is about 100 Ω thermocouple.

7, signal shielding system in DCS cabinet earthing. Such failures is extremely easy to cause electric charge accumulation on the line, cause the signal drift or shaking. Because the problem is more difficult to find out the fault point, the usual treatment method is to solve signal lines, to the discharge process.

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