Temperature Gauge
Pressure Gauge
January 24, 2022
What is a Temperature Transmitter?
February 3, 2022Temperature Gauge
Temperature gauges, or thermometers, are used for the accurate reading of temperature gradients. The term "temperature gauge" generally refers to a device that displays readings on a graduated dial. Temperature gauges operate based on principles such as bimetallic expansion, gas expansion, and other activation methods. They cover a temperature range from -200°C to +700°C, offering different accuracy classes, response times, and environmental resistance. Various designs exist depending on connection type, stem diameter, stem length, and other specifications. All temperature gauges can be used with a thermowell if necessary. Temperature gauges are widely used in industries such as oil and gas, petrochemical, refineries, steel, power plants, and more, and are among the most important instruments for temperature measurement and monitoring in industry.
Isatis Farayand Abzar Company is a supplier of various general-purpose industrial temperature gauges (thermometers) as well as specialized temperature gauges required by different industries, from reputable European and Asian brands, including Wika, Nouvafima, Winters, and more.
Types of Temperature Gauges
Temperature gauges are manufactured in different types based on their operating principles, as described below:
Bimetallic Thermometers
Inert Gas-Filled Thermometers
Temperature Switches
These instruments are used to monitor the electrical operation of compressors, pumps, presses, hydraulic and pneumatic equipment, and chemical and petrochemical plants. The contacts open or close the circuit depending on the indicator position and are adjustable across the full range. The effects of vibration and pulsation on the instrument are significantly reduced due to the liquid filling, as well as protection against corrosive atmospheres, ensuring the durability and reliable performance of both the gauge and the electrical contacts.
Temperature Gauge Mounting and Connection Types
The types of gauge connections are as follows:
- Standard Threaded Connection: Features a male threaded connection.
- Female Threaded Connection: The connection point is designed as a female threaded fitting.
- Flanged Temperature Gauge: The connection point features a flange.
Each of the above connection types can be installed in the system either as a vertical or horizontal connection. Horizontal flanged connections are typically used in control panels. Temperature gauges are usually positioned based on the dial angle (for better user visibility) as follows:
- Bottom Connection (Vertical or from Below)
- Back Connection (Horizontal)
- Telescopic Connection: The dial can be rotated to any angle relative to the stem axis.
The dial positioning of analog temperature gauges is similar to digital ones, with back, bottom, and telescopic connections.
Fluid Type and Material of Temperature Gauges
Since temperature gauges are used in various processes and for measuring different fluids, the material of the gauge must be chemically compatible with both the operating environment and the fluid it contacts. The connection point and the dial casing of the gauge can be made from different materials. For example, if the fluid contacting the gauge is corrosive, the connection should be made of stainless steel. However, if the environment in the same process is non-corrosive, a stainless steel body may not be necessary. Considering the process conditions and chemical compatibility is crucial when selecting a suitable gauge, as it can prevent damage to the gauge and, in some cases, avoid additional costs to the system.
The body material of a temperature gauge may include any of the following:
- Gauge Body Made of Carbon Steel
- Cast Iron
- Aluminum
- Brass
- Polypropylene
- Phenolic Resin Materials
Accuracy Class of Temperature Gauges
The accuracy class represents the maximum permissible error of a gauge, expressed as a percentage of the full-scale reading. According to EN 13190, temperature gauges are available in accuracy class 1 or 2.
Temperature Gauge Size
The size of temperature gauges is determined by the dial diameter. Standard temperature gauge sizes are measured in millimeters and, according to EN 837, are available in 40, 50, 63, 80, 100, 160, and 250 mm.
Temperature Measurement Units
Temperature gauges are manufactured in various types and can display temperature in different measurement units. The standard unit in a temperature gauge is Celsius, and most gauges have a single unit scale. However, gauges with dual units—Celsius and Fahrenheit—are also available. If customers require other measurement units, they can request them from the experts at Isatis Farayand Abzar Company, and the temperature gauge will be calibrated and graduated according to the customer’s specifications.
Temperature Gauge Repair
It should be noted that a temperature gauge is a very sensitive temperature measuring instrument. Therefore, if you lack the necessary skills and experience, it is recommended to consult a qualified expert for repair. For further advice and guidance on temperature gauge repair, you can contact the experts at Isatis Farayand Abzar Company.
Temperature Gauge Brands
Isatis Farayand Abzar Company is a supplier of various specialized industrial temperature gauges and the official representative of the brand NouvaFima in Iran.
NuovaFima is the first Italian company with over 80 years of experience and 5 branches worldwide, manufacturing industrial equipment such as temperature gauges, and holding a significant share of the industrial instrumentation market.
NuovaFima also manufactures thermowells, diaphragm seals, syphons, and various accessories for pressure and temperature gauges and transmitters.
For more information, you can visit the NuovaFima website.
Isatis Farayand Abzar Company also maintains a stock of various pressure gauge models from reputable brands such as Wika, NouvaFima, and Winters at its Tehran office warehouse, available for immediate delivery.
The engineering team at Isatis Farayand Abzar Company is capable of providing consulting services to help select the most suitable model based on operating conditions, environment, and fluid type, as well as to find equivalents for older or sanctioned temperature gauge brands and models for valued customers.
To contact the experts at Isatis Farayand Abzar Company for consultation, supply, or finding equivalents for older brands, You can send an email to: info@isatis-fa.com or call by phone at 88480795 021 or send a fax to 88480798 021 Share your request with the company’s specialists.
