April 8, 2013 – ABB announces 266 multivariable transmitter with TTG (Through The Glass) technology for direct communication between the user and the device. The device can be configured through the glass of the housing cover via four buttons on the display of the transmitter. Particularly in the case of devices with "flameproof enclosures" and applications under tough ambient conditions, this intelligent technology makes configuration easier and helps to save time and costs. The PILD (Plugged Impulse Line Diagnostics) function is part of the integrated diagnostics of the multivariable transmitter 266. It monitors the impulse lines for clogging, identifies a possible fault before the measuring point fails and signals this in a status message.
The devices have a binary output as pulse or frequency output for activating external totalizers or for signalling limit value violation. There is a choice of the following basic versions. • Differential pressure deviation 0.075 per cent, optionally 0.04 per cent • Standard process connection or with pressure sensor • Measurement of three process values with or without calculating function for flow rate or level.
The multivariable transmitters in the 266 series calculate the mass flow or standard volume flow for gases, vapours and liquids with dynamic flow compensation directly from the three process variables of differential pressure, absolute pressure and temperature. They are used for differential pressure flow measurements. Apart from pressure- and/or temperature-dependent changes to the density of the fluid, the parameters such as the discharge coefficient, thermal expansion of pipelines and primary device and the Reynolds number are also corrected. In addition to high precision, the multivariable 266 also offers the advantage that only a single device needs to be used for the measuring point instead of several transmitters and a flow calculator.
Thanks to the approval in accordance with IEC61508, the transmitter 266 can also be used in environments in line with SIL2 (1oo1) and SIL3 (redundant architecture, 1oo2) and thus represents the smartest solution for safety measuring points.
