What is multivariable transmitter?
A multivariable transmitter is a differential pressure transmitter that is capable of measuring a number of independent process variables, including differential pressure, static pressure, and temperature.
How does a multivariable transmitter work?
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.
What is a multivariable smart transmitter?
The Smart Multivariable Flow Transmitter is a differential pressure transmitter with built-in temperature and pressure compensation that measures the mass flow rate of gases.
What is multivariable flow meter?
Multivariable DP flowmeters are capable of providing additional process measurements and process information, including process temperature, line pressure, fluid properties, and specifics about the pipe geometry and primary element.
How does a wet leg work?
In a wet leg system, the low-pressure impulse line is completely filled with liquid (usually the same liquid as the process) and hence the name wet leg. The catch tank, with the inclined interconnecting line, maintains a constant hydrostatic pressure on the low-pressure side of the level transmitter.
How are transmitters calibrated?
In other words calibration of the transmitter is required to make the transmitter’s percent input equal to the transmitter’s percent output. This is accomplished by adjusting screws located and clearly marked as ZERO and SPAN on the analog transmitter’s outer casing.
What is the difference between dry leg and wet leg?
Wet legs are used when the vapour in the tank will condense into liquid form. Likewise, dry legs are used when the vapour does not condense.
What does Wetleg mean?
wet leg noun A self-pitying person.
How is a differential pressure transmitter calibrated?
Apply a pressure to the transmitter equal to a lower range pressure (usually it correspond to 4 mA in the transmitter output). For example we have 0 to 100 mBar calibrated range, then the lower range pressure is 0, or let’s say we have -2 psig to 5 psig then we have lower range pressure equal to -2 psig.
When do you need an ABB multivariable transmitter?
The combination of ABB’s Totalflow flow computer or RTU and one or more ABB 266 Modbus ® multivariables makes an ideal solution when multi-tube measurement is required and/ or when the transmitters must be located in a Class I, Division 1 hazardous location.
How does the ABB 266 series pressure transmitter work?
266JST The multivariable transmitter 266JST is able, thanks to multisensor technology, to measure differential pressure, absolute pressure and temperature of liquid, vapour and gas. Temperature is measured via an external RTD. Movie: ABB 266 series pressure transmitter
When to use a multivariable pressure transmitter?
Multivariable transmitters 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.
How does the multivariable transmitter 266jst work?
The multivariable transmitter 266JST is able, thanks to multisensor technology, to measure differential pressure, absolute pressure and temperature of liquid, vapour and gas. Temperature is measured via an external RTD.