WIKA TR12-B TR12-M 过程热电阻温度计 配保护套管 防爆Ex d Ex i

Process resistance thermometer
Model TR12-B, for additional thermowell
Model TR12-M, basis module

Fig. left: Process resistance thermometer model TR12-B
Fig. right: Basis module model TR12-M

   Applications
    ■ Chemical industry
    ■ Petrochemical industry
    ■ Offshore
    ■ Plant and vessel construction

   Special features
    ■ For many variants of temperature transmitters with field transmitter
    ■ For mounting in all standard thermowell designs
    ■ Spring-loaded measuring insert (replaceable)
    ■ Explosion-protected versions Ex d, Ex i

   Description
    Resistance thermometers in this series can be combined with a large number of thermowell designs. The replaceable, centrically spring-loaded measuring insert and its extended spring travel enable combination with the widest range of
connection head designs.
    A wide variety of possible combinations of sensor, connection head, insertion length, neck length, connection to thermowell etc. are available for the thermometers; suitable for any thermowell dimension and any application.

   Specifications

   



    Neck tube versions

   

    Measuring insert
    The exchangeable measuring insert is made of a vibrationresistant sheathed measuring cable (MI cable).
    The diameter of the measuring insert should be approx. 1 mm smaller than the bore diameter of the thermowell. Gaps of more than 0.5 mm between thermowell and the
measuring insert will have a negative effect on the heat transfer, and they will result in unfavourable response behaviour from the thermometer.
    When fitting the measuring insert into a thermowell, it is very important to determine the correct insertion length (= thermowell length for bottom thicknesses of ≤ 5.5 mm). The measuring insert should be spring-loaded (spring travel: 0 ... 20 mm) in order to ensure that it presses against the bottom of the thermowell.

   Neck tube
    The neck tube is screwed into the connection head or the case. The neck length depends on the intended use. Usually an isolation is bridged by the neck tube. Also, in many cases, the neck tube serves as a cooling extension between the connection head and the medium, in order to protect any possible built-in transmitter from high medium temperatures.
    In the Ex d version the flameproof joint is integrated in the neck tube.

   Thermowell selection

   

    Transmitter (option)

   

    Explosion protection
    For application in hazardous areas, corresponding versions are available.

   Intrinsic safety
    The instruments comply with the requirements of 94/9/EC
    (ATEX) directive for gas.

   Flameproof enclosure
    These instruments comply with the requirements of 94/9/EC (ATEX) directive or IECEx for gas.

    The classification/suitability of the instrument (permissible power Pmax as well as the permissible ambient temperature) for the respective category can be seen on the EC typeexamination certificate or on the IECEx certificate and in the operating instructions.

    Built-in transmitters have their own EC type-examination certificate. The permissible ambient temperature ranges of the built-in transmitters can be taken from the corresponding transmitter approval.

   Functional safety (option)
    In safety-critical applications, the entire measuring chain must be taken into consideration in terms of the safety parameters. The SIL classification allows the assessment of the risk reduction reached by the safety installations.
    Selected TR12 process resistance thermometers in combination with an appropriate temperature transmitter (e.g. model T32.1S) are suitable as sensors for safety
functions up to SIL-2.
    Matched thermowells allow easy dismounting of the measuring insert for calibration. The optimally tuned measuring point consists of a thermowell, a TR12
thermometer and a T32.1S transmitter developed in accordance with IEC 61508. Thus, the measuring point provides maximum reliability and a long service life.

   Electrical connection
    (Colour code per IEC 60751)

   

   Ordering information
    Model / Explosion protection / Ignition protection type / Sensor / Sensor    specification / Thermometer operating range / Terminal box / Thread size at the cable entry / Cable entry / Transmitter / Neck tube version / Connection to housing, connection head / Connection to thermowell / Neck tube length N(MH) / Insertion length A / Measuring insert / Options

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