The Multivariable transmitter measures and calculates the mass flow as a function of differential pressure DP as well as absolute pressure and the temperature. Therefore it should be used whenever 
DP flow measurement needs a compensation of temperature and pressure. The main advantage is to have just one single device in the field instead of several transmitters and a mass flow calculator.
266CRH Multivariable transmitter with remote diaphragm seals for mass flow and level, accuracy 0.075%
266CRT Multivariable transmitter with remote diaphragm seals for mass flow and level, accuracy 0.04%
266CSH Multivariable transmitter for mass flow and level, accuracy 0.075%
266CST Multivariable transmitter for mass flow and level, accuracy 0.04%
266JRH Multivariable transmitter with remote diaphragm seals for differential pressure, absolute pressure and temperature measurement, accuracy 0.075%
266JRT Multivariable transmitter with remote diaphragm seals for differential pressure, absolute pressure and temperature measurement, accuracy 0.04%
266JSH Multivariable transmitter for differential pressure, absolute pressure and temperature measurement, accuracy 0.075%
266JST Multivariable transmitter for differential pressure, absolute pressure and temperature measurement, accuracy 0.04%
266 MODBUS Multivariable transmitter for differential pressure, static pressure, temperature measurement, and diagnostics, accuracy 0.04%