Infrared Thermometer Supplier Malaysia

Non-contact Temperature Sensors

These detectors measure the amount of radiation emitted by a surface. As the temperature of a body increases, the amount of infrared emitted and its average frequency also goes up.

The target material radiating efficiency will have a bearing on the reading and the emissivity ( between 0 and 100%) needs to be known. This rating can vary between 95% for an efficient surface to 20% for polished metal.

The emissivity of the surface must be known. Varying oxidation or roughness will affect the reading. A coating is often applied to ensure a certain emissivity figure.

Care needs to be taken to avoid reading contamination from sources other than the target. A detector will have a certain field of view which can be altered to concentrate on the target.

One significant advantage of infrared temperature measurement is that it is non-contact. Thus moving bodies, fragile or wet surfaces and very aggressive media can be measured with relative ease. Very large surfaces can also be measured and simply averaged, or hot spots detected without masses of wiring and detectors.

Only surface temperatures can be read. If the bulk temperature of a process is to be recorded a sheath must be inserted into the process and it must act as a sighting target.

Infrared thermometers can record high temperatures up to 3000 °C, well above Thermocouples and Resistance Thermometers (RTDs) although they suffer from higher inaccuracies and other problems such as radiant heat.

Contact us to purchase Infrared Temperature Sensors. dpstar Group offer a full range of infrared temperature sensors. Please call Ms. Toh at 012-2951393 or email to sbtoh@dpstar.com.my.

 

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Thermocouple Wire Supplier Malaysia – Compensating and Extension Cable

Thermocouple Extension Cables use the actual thermocouple materials, but in cheaper forms. This is achieved by using cheaper insulations, wider tolerance alloys and thinner conductors (as they will see little thermal stress in their lifetime). They are produced in multi-stranded forms for ease of installation The thermoelectric performance is clearly very similar to the actual sensor.

Thermocouple Compensating Cables use completely different alloys that happen to exhibit very similar thermo-electric properties up to a limited temperature (usually 200°C ). Great care should be taken to control the temperature of the junction between the compensating cable and the actual thermocouple material to keep it below the acceptable maximum. Compensating cables come in convenient cabling forms for site installations.

thermocouple table_

dpstar Group is  thermocouples wire supplier in the Malaysian Market. We’re here to help, please call Ms. Toh at 012-2951393 or email to sbtoh@dpstar.com.my.

Thermocouples VS RTD’S

The following chart indicates some inherent advantages and disadvantages of RTD’s or thermocouples.

THERMOCOUPLE RTD’S
Accuracy Limits of error wider than RTD Limits of error smaller than thermocouples
Ruggedness Excellent Sensitive to strain, shock, and pressure
Temperature -400° to 4200°F -200° to 1475°F
Size Can be as small as .01” sheath material, tip sensitive Size limited to 1/16”, temperature sensitive for length of bulb
Drift Should be checked periodically, higher than RTD’s 0.01 to 0.1°C per year, less drift than thermocouple
Resolution Must resolve millivolts per degree, lower signal to noise ratio Ohms per degree, much higher

signal to noise ratio than thermocouple

Cold Junction Reference Required Not required
Lead wire Must match lead wire calibration to thermocouple calibration Can use copper lead wire for extension wire
Response Can be made small enough for millisecond response time Thermal mass restricts time to seconds or more
Cost Low Higher than thermocouples

dpstar is the leading supplier and manufacturer in Malaysia. We are one of the largest distributor throughout South East Asia. We’re here to help, please call Ms. Toh at 012-2951393 or email to sbtoh@dpstar.com.my.

How To Choose A Temperature Sensor?

There are many things that need to be taken into account when designing a temperature sensor. The key is to determine what are the critical factors which relate to your process or product and dismiss the rest.

In order to make the process as easy as possible answer the questions below and send your answers to us to help you get the sensor for your application:

  1. What is your temperature range?
  2. What are your accuracy requirements?
  3. How many sensors do you need?
  4. What are the size requirements or restrictions? Diameters? Lengths?
  5. How long does it need to last?
  6. Do you require calibration?
  7. When do you need it?
  8. Is it light use at ambient temperature, or harsh use at extremes of temperature, under attack?
  9. How do you want to measure your process/product? (Hot end)
  10. How does it connect to your equipment/instrumentation ? (Cold end)

dpstar Group is an industrial heating elements and thermocouples supplier in the Malaysian Market. We’re here to help, please call Ms. Toh at 012-2951393 or email to sbtoh@dpstar.com.my.