Temperature Control

Temperature control equipment is one of the primary monitoring and control equipment in so many fields. In the following, we've provided technical information, applications, how to choose, and prices of temperature transmitters, thermometers, thermostats, temperature and humidity sensors, dimmers, etc.

Temperature Control Equipment Review, Selection, and Pricing

In most industrial environments, the temperature is one of the quantities we need to be controlled or measured. For this purpose, various types of temperature control equipment are used to accurately measure and control the temperature of different liquids and solids.

In the following content, we have briefly introduced you to the types of temperature control tools and their functions.

Types of Temperature Control Equipment

The following are some of the most popular temperature control equipment that are used in so many places:

• Regular thermometer
• Laser thermometer (infrared)
• Non-metal thermometer
• Thermostat
• Temperature transmitter
• Thermocouple
• Damangar
  
  

Temperature control equipment is divided into contact and non-contact:

Contact Temperature Control Equipment

Resistance thermometers, thermoelectric thermometers, liquid thermometers in glass, and the like are among the thermometers used to measure temperature by contact. Except for glass thermometers, these thermometers generally include a detector, an indicator, and a transmitter.

Non-Contact Temperature Control Equipment

Non-contact temperature measurement is generally done through laser, infrared, etc. In addition, non-contact temperature measuring equipment is used to measure the temperature of objects or fluids inaccessible directly.

Non-contact sensors have a higher price than other types of temperature sensors, and because of this, their range of use in different industries is much less.

But in the end, it is necessary to use non-contact sensors to determine the temperature of objects that are far away, and it is impossible to establish a direct connection between them.
Radiation thermometers, which are used in the non-contact method, consist of three main elements as follows:

• The optical system that transmits the radiation from the object to be measured to the sensing element.
• Sensing element that converts radiation into an electrical signal (such as a photoelectric transmitting element).
• A signal processing circuit that converts an electrical signal into thermal information.
  
  

Glass Thermometers

Glass thermometers, which have two types mercury thermometers and alcohol thermometers, are among the most common and most straightforward thermometers.

The construction of glass thermometers consists of a liquid tank, and a capillary tube, the liquid inside the tank rises from the capillary tube due to expansion and shows the appropriate temperature.

Mercury Glass Thermometers

A mercury thermometer is a familiar example of a temperature gauge. An increase in temperature causes the mercury to expand, and the height of the mercury column increases.

These thermometers have a limited measurement range, and their output is not helpful in control systems.

Mercury Vs. Alcohol Thermometers

The measurement range of these two thermometers is different. Alcohol thermometers can be used in very low temperatures.

At the same time, mercury thermometers cannot measure temperatures below -35 degrees Celsius because mercury freezes at -39 degrees Celsius. Therefore, alcohol thermometers are used to measure extreme cold.

Gas Thermometers

A gas thermometer consists of a bubble made of glass, porcelain, quartz, platinum, etc. (the bubble type is chosen based on the temperature range used in the thermometer). The bubble is connected to a thermometer by a capillary tube.

Electric Resistance Thermometers

Electrical resistance thermometers consist of a long, thin wire usually wrapped around a thin frame to avoid stress caused by the change in length of the wire as it contracts as it cools.

Sometimes the wire is wrapped around the object whose temperature is to be measured or placed inside it if possible. The platinum resistance thermometer is used for accurate measurements of 253 to 1000 degrees Celsius.

Quartz Thermometer

A quartz thermometer is a new and very accurate method of temperature measurement based on the sensitivity of quartz crystal resonance frequency to temperature change. This device's temperature range is approximately -40 to +230 degrees Celsius.

Thermocouple

Thermocouples are made of two non-homogeneous metals (such as copper and iron) if we heat their junction, a voltage (EMS) is formed on the other side of them, which is directly related to the temperature of the junction of the two metals.

Infrared Thermometer

Infrared thermometers or IR thermometers are used to accurately measure temperature in a non-contact form and a wide temperature range.

Pyrometer

A pyrometer is a non-contact temperature-measuring device that measures thermal radiation.

Bimetallic Thermometer

Metals in bimetallic thermometers are selected so that the coefficient of longitudinal expansion of one is more than the other.

If one side of this pair is kept at a fixed point, when the temperature increases, the difference in the length of the two metals causes the pair to bend, and these mechanical movements cause the thermometer needle to move.

Other Thermometers

• Liquid crystal thermometer
• Fiber optic thermometer
• Medical thermometer
  
  

Thermistors

The thermistor is a semi-conducting device that, unlike metals, has a negative temperature coefficient of resistance. Meaning its electrical resistance decreases as the temperature increases.

A thermistor is susceptible and expected to have a constant (0.01°C) performance when adequately rated. One of its exciting features is that it can be used as a compensator for electric circuits.

Thermostats

A thermostat is an automatic electrical control device that is usually connected to the heating and air conditioning devices to regulate the temperature in a closed space so that it keeps the space at the set temperature by turning the device off and on.

The thermostat cuts off the device's electrical circuit when the temperature reaches the set point. When the temperature drops 1 to 2 degrees below the set point, it reconnects the circuit, and the device turns on.

Types of thermostats

Thermostats are divided into several types in terms of:

• Installation Location: They are mainly divided into the room, duct channel, submerged, and wall types.
  
  
• Operation Type: They are divided into disconnecting, connecting, and gradual types.
  
  
• Temperature Range: They are divided into thermal and cryogenic types, below zero and above zero.
  
  
• Operation Steps: They are divided into one-step, two-step, and multi-step (step control) types.
  
  
• Sensor Type: They are divided into bimetallic, lantern, rheostat, and diaphragm types.
  
  
• Season: They are divided into summer, winter, and two seasons types.
  
  

Different types of thermostats are used in HVAC equipment which are:

• Duct Channel Thermostat
• Room Thermostat
• Three-Way Thermostat (used in fan coil units)
• Four-Stage Thermostat (used in chillers)
  
  

Thermostat Applications

In general, the thermostat is used to regulate the temperature of liquids, gases, and solids in heating and air conditioning devices in the following sections:

• Industrial: It includes greenhouses, greenhouses, furnaces, steam boilers, engine houses, autoclaves, etc.
  
  
• Construction: Assum in the facilities department, including central heating and temperature control in air conditioning systems, including air conditioners, chillers, fan coils, etc.
  
  
• Home: It is in washing machines, dishwashers, fryers, electric samovars, ovens, electric and gas water heaters, etc.
  
  

Buying Thermal Control Equipment

On the DamaTajhiz HVAC store, technical information and prices for all types of thermometers and thermometers, round plate, comet, digital, brass, steel, temperature transmitter, thermostat, temperature and humidity sensors, etc. from reputable brands such as Honeywell, Vika, Pekins, TG, etc, etc., have been presented for you to enjoy a good and smart shopping experience.

All products in the DamaTajhiz HVAC store come with the original warranty and the discounts desired by customers have already been included. If you have questions about Temperature control equipment, you can contact us through email or WhatsApp.

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