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    Dial Type Temperature Indicators


    PT 100 RTD and Thermister Assembliesin various construction. Simpex, Duplex RTD with 3 wire/4 wire construction in weatherproof/flame proof head. Sheath material of SS 316.MgO packed sheath for flexible application. Resistance temperature detectors (RTD) are temperature sensors, which work on principles for resistance offered by metallic element and its variation based on temperature. Metals which provide predictable, stable and linear resistance gradient are generally used for this purpose. Many metals exhibit these properties.

    Resistance temperature detectors (RTD) are temperature sensors, which work on principles for resistance offered by metallic element and its variation based on temperature. Metals which provide predictable, stable and linear resistance gradient are generally used for this purpose. Many metals exhibit these properties. Of which copper, Platinum, Silver and Gold are commonly used. Copper is used for cryogenic and sub-zero applications. Commonly available element is Cu53 : 53 Ohm resistance at Zero Deg Temperature. Where as Platinum is used for most industrial applications. Commonly available elements are Pt50, Pt100, Pt200, Pt500 and Pt 1000. Pt100: 100 Ohm resistance @ 0 Deg C is by far the most popular and easily available element. RTD elements are classified in various categories based on its accuracy such as: Class - A, Class - B, Band1 to Band 5.
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    Rtd Element Construction :
    For laboratory applications Platinum wire embedded in Glass capsules are available.
    However for industrial purpose fragility and price restrict their use.

    For industrial applications two most popular constructions are :
    Wire wound ceramic bulbs and thin film type elements.
    Wire wound elements are more stable and offer wider temperature range where as film type are economical and are restricted to low temperature applications.
       
      Rtd Standards :
    IEC - 751:1983, DIN 43760, BS EN 60751:1969 are commonly used calibration and
    tolerance standards for RTD elements.

    Typical Class A element Error is 0.15 Deg C @ 0 Deg C and Typical Class B element Error is 0.3 Deg C @ 0 Deg C. Tolerance values of all stadard RTD elements are plotted on the following page of this catalogue.
    Standard Pt100 RTD elements are constructed from Pt having “Alpha” coefficient at 0.00385 / Deg C and resistance of 100 ohms at 0 Deg C.
       
     
    Satiable for general application up to 200 Deg C. Film and Ceramic type element in Seamless SS316 sheath with extension lead wire in two / three wire construction.
       
    Hand held RTD assemblies are suitable for liquid, Gas and semi solid, Available in Pt 100 film and Ceramic element with Mior rigid SS Sheath and Ebonite handle with PVC extension cable Suitable for Temp up to 180 Deg C.
       
    Bayonate type suitable for plastic machinery, bearing chokesetc. Available in Film and Ceramic type element with SS 316 sheath and extension lead wire. Suitable for Temp up to
    250 Deg C.
       
    Heavy duty metal sheathed industrial RTD assemblies are suitable for most arduous industrial environments. Available in Ceramic Element in Accuracies such as Class B,A, Band 1, 2 and 3 with variety of sheaths such as SS 304, SS 316 and SS 310.
       
    Mineral insulated metal sheathed RTD Assemblies are suitable for spaces which are difficult to reach. Available in Ceramic element with variety of sheaths such as SS 304, SS 316 and SS310.
       
     
       
     
     
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