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Bimetal thermometer

Model：WSS
Category：Bimetal thermometer
origin：SHANGHAI

WSS Bimetal thermometer SHANGHAI AUTOMATION INSTRUMENTATION CO. LTD. NO.?11?AUTOMATION INSTRUMENTATION FACTORY Shanghai Yi Electric Actuator SHANGYI ELECTRIC ACTUATOR SHANGYI BRAND SHANGZIYI THEMOCOUPLE AND PRESSURE GAUGE

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WSS Bimetal thermometer

Shanghai Automation Instrumentation Co., Ltd. production of bimetallic thermometer is a measurement of low temperature field detection instrument. Can be directly measured in a variety of production processes in the range of -80 ℃ - +500 ℃ liquid vapor and gas medium temperature. Industrial Bimetallic Thermometers The main components are a multi-layer metal sheet consisting of two or more metal sheets stacked together, using two different metals in the temperature change when the degree of expansion of different principles of work. Is based on the formation of ring-like bending around the composition of bimetal. One end of the thermal expansion, driven by the pointer rotation, the working instrument will show the thermoelectric potential should be the temperature value.

product description

WSS series of bimetallic thermometer is a measurement of low temperature field detection instrument. Bimetallic thermometer can be directly measured in a variety of production processes in the range of -80 ℃ ~ +500 ℃ liquid, steam and gas medium temperature.

Principle structure

Bimetallic thermometer is a hot bimetal into a screw thread as a temperature sensing device, and put it in the protective sleeve, one end of the fixed, known as the fixed end, the other end connected to a thin shaft, become free end. A pointer is mounted on the free end spool. When the temperature changes, the free end of the temperature device will rotate, causing the pointer on the thin axis to produce an angle change, indicating the corresponding temperature on the dial.

Selection Notes

classification

The bimetallic thermometer can be divided into axial, radial, 135 ° and universal.

① axial type bimetallic thermometer: dial and vertical protection tube connected.

② radial bimetallic thermometer: pointer plate and protective tube parallel connection.

③135 ° bimetallic thermometer: pointer plate and protective tube into a 135 ° connection.

④ universal double metal thermometer: pointer plate and protective tube connection angle can be adjusted.

Fixed form

In order to meet the actual production needs, bimetallic thermometers have different mounting forms: movable external thread fittings, movable internal thread fittings, fixed threaded joints, card sets of threaded joints, card sets of flange joints and fixed flange.

Features

Bimetallic thermometer has the advantage of fast response, small size, good linearity, more stable, some foreign products also have high temperature performance.

The thermoelectric power of the bimetallic thermometer of Shanghai Automation Instrument Factory is related only to the thermoelectric properties of the hot electrode material and the temperature difference between the two ends.

Using the same homogeneous conductor or semiconductor circuit, do not produce thermoelectric power.

Thermocouple two contact temperature T, T0, if T = T0, thermocouple thermoelectric power is zero. The law of intermediate temperature lays the foundation for the development of thermocouple indexing.

For many years, scientists have tried to study whether the relationship between the temperature of the thermocouple (measuring end) of the thermocouple and the thermoelectric potential generated by the thermocouple circuit can be expressed by a functional relationship or even a fractional function.

If the two conductors A, B, respectively, with the third conductor thermoelectric power has a wide temperature range, long-term use of physical and chemical properties of stability

High conductivity, resistance temperature coefficient is small; ※ configuration of the thermoelectric potential of high sensitivity, thermoelectric power and temperature between the linear, easy to copy, the process is simple, cheap.

But the wrong supporting nickel-chromium-nickel silicon compensation bridge, the compensation bridge balance point 0. When the cold junction temperature is 30 ° C, the thermometer indicates the temperature 900 ° C, how much is the actual temperature of the furnace? Use the standard electrode law to determine the element with temperature change.

General bimetallic thermometer used in low temperature, thermocouple used in high temperature. If the temperature exceeds 500 degrees then the resistance of the bimetallic thermometer will be very large, may affect the measurement results, and even can not come out of the measurement results of the situation.

Common types

General bimetallic thermometer has the following types:

Outdoor, heavy

The bimetallic thermometer is a suitable field measurement instrument suitable for measuring low temperature, which can be used directly to measure the temperature of liquid and gas.

The main technical parameters:

(1) Accuracy class: 1.5 level

(2) Time constant: J <40S

(3) protection tube pressure: 6.3MPa

Electrical contact type

Bimetallic thermometer is a suitable measurement of low temperature on-site detection instruments, can be used directly to measure the liquid, gas temperature.

The main technical parameters

(1) Accuracy class: 1.5 level

(2) Time constant: J <40S

(3) protection tube pressure: 6.3MPa

(4) Contact capacity: Rated power 10VA (no sense); Maximum voltage: AC 220V, the maximum operating current: 1A (no sense),

Contact for the upper and lower limits and normally open.

(5) table head work environment temperature: -25 ~ 55 degrees Celsius

Seismic type

WSSXN series of seismic electrical contact bimetallic thermometer is a measurement of low temperature field detection instrument. Can directly measure the various production processes in the range of -80 ℃ ~ +500 ℃ in the liquid, steam and gas medium and

Poor ambient and vibrating temperature.

The shock-resistant electrical contact bimetallic thermometer from the instrument to the internal shock oil, can effectively overcome the mechanical vibration of the pointer jitter. It is widely used in industrial and scientific research departments such as oil, chemical industry, machinery, shipbuilding, power generation, textile, printing and dyeing, etc. It is widely used in the fields of petroleum, chemical, mechanical, shipbuilding, power generation, textile and printing. The

main feature:

(1) the scene shows the temperature, intuitive and convenient, safe and reliable, long service life;

(2) a variety of structural forms, to meet different requirements, no mercury damage, easy to read, strong earthquake;

(3) protection of the pipe for the 1Cr18Ni9Ti stainless steel and molybdenum two titanium, pressure, anti-corrosion ability;

(4) Core-pulling thermometer can be a short time to maintain or replace the movement.

working principle:

Seismic electrical contacts Bimetallic thermometers are based on bimetallic sheets made into a ring-like bend. When the end of the thermal expansion, driven by the pointer rotation, the work of the instrument will show the temperature value, and to prevent environmental vibration in the bimetallic thermometer filled with silicone oil or bimetallic thermometer display part of the measurement part of the separation to achieve the effect of earthquake.

Seismic bimetallic thermometer is divided into one type of seismic contact with double metal thermometer and separate seismic contact with two metal thermometer two.

The main technical parameters:

(1) the implementation of standards: JB / T8803-1998 GB3836-83

(2) Nominal diameter of the dial: 60 100 150

(3) Accuracy class: (1.0), 1.5

(4) thermal response time: ≤ 40S

(5) Protection class: IP55

(6) angle adjustment error: angle adjustment error should not exceed its range of 1.0%

(7) Hysteresis: The hysteresis should not be greater than the absolute value of the basic error limit

(8) Repeatability: The repeatability limit should not be greater than 1/2 of the absolute value of the basic error limit

Universal type

The main technical parameters:

(1) Nominal diameter of dial: 100; 150

(2) Accuracy class: 1.0,1.5

(3) Connection size: M20x1.5, NPT1 / 2

(4) thermal response time: ≤ 40s

(5) Protection class: IP55

Integrated bimetallic thermometer

Overview

Integrated bimetallic thermometer is the thermal resistance or thermocouple signal remote function and bimetallic thermometer in situ indication function, it can meet the needs of the field temperature measurement, but also to meet the long-distance transmission needs, remote dual metal thermometer Can be directly measured in a variety of production processes in the range of -40 ~ +600 ℃ liquid, vapor and gas medium and solid surface temperature measurement.

Performance characteristics

1, with a small temperature probe, high sensitivity, linear scale, long life and other characteristics. In the case of

2, with remote output resistance signal (PT100), shock resistance, corrosion resistance and high-power switching signals and other functions. In the case of

3, the structure of the same type of similar products, can replace imports.

Technical Parameters

1, temperature range -40 ~ 600 ℃

2, ambient temperature -10 ~ 55 ℃

3, relative humidity ≤ 95%

4, the accuracy level of 1.5

5, the time constant ≤ 60S

6, the probe pressure ≤ 6Mpa

7, probe diameter: φ8-10mm, movable external thread: M27 * 2

8, thermal resistance PT100 (single, dual output) or 4-20mA current output

9, protection class: IP55

Hot tube type

The thermal boring type bimetallic thermometer can be used to meet the different pressure grade requirements. Can be directly measured in a variety of production processes in the range of -80- +500 ℃ liquid, steam and gas medium and solid surface temperature measurement. Widely used in petroleum, chemical, metallurgical, textile, food and other industries.

Installation requirements

The installation of bimetallic thermometer should pay attention to the accuracy of temperature measurement, safety and inspection and easy maintenance, and does not affect the equipment operation and production operations, to meet the above requirements, in the choice of thermal resistance to the installation site and insert the depth of attention The following points:

(1) In order to have sufficient heat exchange between the measuring end of the thermal resistance and the measured medium, the position of the measuring point should be selected reasonably so as to avoid installing the thermal resistance near the dead ends of the valves, elbows and pipes and equipment.

(2) Thermal resistance with protective sleeve has heat and heat loss, in order to reduce the measurement error, thermocouple and thermal resistance should have sufficient insertion depth:

a. For measuring the thermal resistance of the pipe center fluid temperature, it is generally necessary to insert its measuring end into the center of the pipe (vertical or tilted). If the measured fluid pipe diameter is 200 mm, then the thermal resistance insertion depth should be selected 100 mm;

b, for high temperature and high pressure and high temperature fluid temperature measurement (such as the main steam temperature), in order to reduce the protective sleeve on the resistance of the fluid and prevent the protective sleeve in the fluid under the action of fracture, can take protective tube shallow plug or Thermal resistance. Shallow plug of the thermal resistance of the casing, the insertion of the main steam pipe depth should not be less than 75mm; thermal sleeve thermal resistance of the standard insertion depth of 100mm;

c, if you need to measure the temperature of the flue gas flue, although the flue diameter of 4m, thermal resistance can be inserted into the depth of 1 m;

d, when measuring the original insert depth of more than 1m, should be installed as far as possible vertical, or the installation of support and protective casing.

Use maintenance

edit

1, WSS series of bimetallic thermometer in the custody, installation, use and transportation process, should try to avoid collision protection tube, do not make Paul. Protection tube bending, deformation. Do not twist the instrument case when installing.

2, the instrument should be -30 ℃ ~ 80 ℃ ambient temperature within the normal work.

3, the instrument often work temperature is best in the scale range of 1/2 to 3/4.

4, bimetallic thermometer protection tube immersed in the measured medium length must be greater than the length of the temperature sensor, the general immersion length greater than 100mm, 0-50 ℃ range of the immersion length greater than 150mm, to ensure the accuracy of the measurement.

5, all kinds of bimetallic thermometer should not be used to measure the temperature of the media inside the open container, live contact thermometer should not be in the work of the larger vibration control circuit used in the occasion.

6, bimetallic thermometer in the custody, the use of installation and transportation, should avoid collision protection tube, do not make the protection tube bending and the table will be used when the wrench.

7, the thermometer in the case of normal use should be regularly tested. Generally every six months is appropriate The electrical contact thermometer does not allow for strong vibration to work, so as not to affect the reliability of the contacts.

SHANGHAI AUTOMATION INSTRUMENTATION CO. LTD.

NO. 11 AUTOMATION INSTRUMENTATION FACTORY

Shanghai Yi Electric Actuator

SHANGYI ELECTRIC ACTUATOR

SHANGYI BRAND

SHANGZIYI THEMOCOUPLE AND PRESSURE GAUGE