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The Industrial Thermometer of the Future... Tel-Tru’s DIGI-TEL Thermometers combine the easy, quick visual reference feature of a local indicator and the precision readout of a digital thermometer with a unique interchangeable probe concept. DIGI-TEL battery powered models combine the easy, quick visual reference feature of a local indicator and the precision readout capability of a digital thermometer with a unique interchangeable probe concept...SELECT, CONNECT, and INSTALL! DIGI-TEL solar powered models are available with an integrated cable and/or probe. All DIGI-TEL models have a one year warranty. Local temperature indicators available without external power, until now, have all been analog dial types, either filled with mercury or gas, or of bimetal design. The new DIGI-TEL thermometer has been designed utilizing state-of-the-art microprocessor technology, resulting in a more reliable, flexible, and accurate alternative in temperature measurement. The Tel-Tru solar powered DIGI-TEL has as its energy source a solar cell as an integral part of the display module. The instrument functions reliably in artificial light at levels above 50 lux. The 100-lux minimum for many industrial plants means the installation of the Tel-Tru solar powered DIGI-TEL can be used practically anywhere. The Tel-Tru battery powered DIGI-TEL uses a lithium battery, which has a working life of five years. Interchangeable probe assemblies offer maximum flexibility for use in industrial, test, and OEM applications. Direct and Remote thermometers styles are available. DIGI-TEL thermometers are easy to install because sensor assembly and display indicator can be selected according to the application and easily connected on-site for installation into standard thermowells. The Display Module Dual Analog and Digital Display The circular arrangement of LCD “graduations” are designed to give the appearance of a traditional dial instrument, while the exact temperature can be read from a 4 digit display. DIGI-TEL models with a digital only display and with large high-resolution digits are also available. Modules are all stainless steel. The heavy-duty industrial assemblies are available as back, bottom, adjustable angle, or remote configurations. The unit complies with the vibration requirements of German Lloyd for marine applications (modules D1A and D5A excluded). Dust and moisture protection level is to IP 65 and electromagnetic interference complies with the requirements of the EC standards. New Concept, Traditional Design! The Probe Assembly--Sensor The temperature sensor is a thin film Platinum RTD, Pt 1000 2-wire type. Grounding is not necessary due to minimal resistance change over length. Maximum length recommended is 163 feet/50 meters. Very low power consumption of the sensor allows use of solar powered modules, or up to a 5 year life on battery powered units. Signal conditioning is performed by the microprocessor. The small size of the sensor chip allows pinpoint positioning in the medium for faster response characteristics Interchangeable Probe Construction Probe assemblies for the battery powered models are interchangeable with all display modules through the use of a standard watertight connector assembly. Cable assemblies for Remote Mounted thermometers use the same interchangeable connectors. The threaded union connection is a standard 1/2" NPT and 6mm diameter stems fit into standard bimetal thermowells. The Measuring Process The Tel-Tru solar and battery powered DIGI-TEL thermometers rely on a periodic measurement process with a 3 second cycle time allowing the viewer, even in passing, to take a real-time reading. An activity display (a sun symbol at the start of display) indicates the measurement cycle. Performance The microprocessor conditions the signal resistance of Pt 1000 with a resolution of 12 bits. The numerical error of measurement is less than 1 Kelvin. This meets the accuracy requirements for measuring equipment to EN 13190 class 1, which is within ±1% of the reading plus 1 degree. Sensor Monitoring The microprocessor continually checks the integrity of the sensor signal. Service Considerations A significant advantage of the Tel-Tru DIGI-TEL thermometers lies in the long-term stability of the electronics to provide the measurement. Integrated diagnostic routines continually check the validity of the sensor output. An error message will occur when there is a short circuit of the sensor connection, the measured value is out of range, and when the probe is not connected to the module or in the event of a sensor failure. |
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