October 19, 2010 -Dwyer Instruments releases the Series TDT Thermal Dispersion Flow Transmitter. It is an excellent alternative to turbine and paddlewheel insertion flow meters, with the ability to deliver high accuracy over a wide range of pipe sizes. These units have the same insertion mounting into a 1-1/2˝ NPT but have no moving parts to wear, break or clog. The TDT Dispersion Transmitter measures very low flow rates due to the applied calorimetric principle and can be used for the metering of all fluid media, such as: water, oil, aggressive media, paste, glue, sludge, grease, etc. Due to the adjustable insertion mounting, one model is suitable for pipe sizes of 1˝ to 24˝, and with available extensions, it can be used for pipes sized up to 75˝ in diameter.
Series TDT is also available in titanium, as well as an optional temperature output, broadening the applications usage.The Series TDT operates with the use of a sensor head that contains two PT-resistors. One of these measures the temperature of the media, while the other is heated by an attached heating resistor. The temperature difference between the two PT-resistors is predetermined and a control circuit keeps this temperature difference constant.
The flow of the media cools the heated PT-resistor proportional to the speed of the flow, which results in a linear output signal proportional to the flow speed.Available flow range options include: 0 to 1.64 ft/s (0 to 0.5 m/s), 0 to 3.28 ft/s (0 to 1 m/s), 0 to 6.56 ft/s (0 to 2 m/s), 0 to 9.84 ft/s (0 to 3 m/s), and 0 to 12.47 ft/s (0 to 3.8 m/s).
