The QVT from Eastern Instruments is available in the SV (Single Variable) or MV (Multivariable) mode and has been optimized for the extremely accurate flow measurement of air and gas at or near atmospheric pressure (5 - 25 psia). Allowing for the measurement of up to four separate process variables including Differential Pressure, Temperature and Absolute Pressure, the QVT will calculate the fully compensated mass flow of air or gas in nearly any duct. When coupled with any Differential Pressure based flow element, the QVT ensures extremely accurate flow measurement down to +/-0.50% of Reading over 100:1 range of DP and 10:1 flow turn-down.
The QVT Series II transmitter simplifies installation over the Series I model by offering a dual access head with one of the heads fully dedicated to wiring and setup. When used as a DP only transmitter, the QVT Series II will accurately measure the differential pressure of flow across an accompanying flow element. The QVT Series II single variable transmitter is configured to output a 4-20 mA signal that is equivalent to the DP.
The QVT Series II can be used to accurately measure flow even if both temperature and absolute pressure not being measured directly. If temperature and absolute pressure are held relatively constant, the QVT can calculate mass flow based on a measured DP and an input or constant value for temperature and absolute pressure. The 4-20 mA output will be equivalent to mass flow when the QVT Series II is configured in this mode. The QVT Series II transmitter simplifies installation over the Series I model by offering a dual access head with one of the heads fully dedicated to wiring and setup.
The QVT Series II transmitter simplifies installation over the Series I model by offering a dual access head with one of the heads fully dedicated to wiring and setup. The Series II model is at its most accurate as a multivariable transmitter, measuring up to four unique process variables including Differential Pressure, Process Temperature and Absolute Pressure. Remaining extremely accurate regardless of changes in process temperature and Absolute Pressure, the QVT calculates the mass flow based on the measured density of the air stream and then outputs the fully compensated mass flow via a 4-20 mA signal.
The QVT can be utilized as a single variable Differential Pressure (DP) Transmitter that will accurately measure the differential pressure of flow across an accompanying flow element. The flow element can either be an EI manufactured flow element or an existing flow element by a manufacturer of choice. The QVT single variable transmitter is configured to output a 4-20 mA signal that is equivalent to the DP.
The QVT can also be used to accurately measure flow. If both Temperature and Absolute pressure are relatively constant, the QVT can calculate mass flow based on a measured DP and an input or constant value for temperature and absolute pressure. The QVT DP Flow Transmitter can be extremely accurate as long as temperature and Absolute pressure remain constant. The QVT MF - DP Transmitter is configured to output a 4-20 mA signal that is equivalent to the flow through a duct.
The QVT is at its most accurate as a multivariable transmitter, measuring up to four unique process variables including Differential Pressure, Process Temperature and Absolute Pressure. Remaining extremely accurate regardless of changes in process temperature and Absolute Pressure, the QVT calculates the mass flow based on the measured density of the air stream and then outputs the fully compensated mass flow via a 4-20 mA signal.
