QVT Multivariable Smart Transmitter for measuring the velocity pressure or Differential Pressure across any flow element in order to measure the flow of air through a duct
The QVT from Eastern Instruments is a multivariable transmitter that 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 turndown.

Below are just a few of the many features and benefits of the QVT Multivariable Transmitter. If you have an application that you would like to discuss, please Contact Us today.


  • MODES OF OPERATION: Multivariable Transmitter (measurement of two or more variables including DP, Temperature and Absolute Pressure); DP Transmitter (DP measurement only)
  • DP MEASUREMENT: Measurement of Differential Pressure across any primary flow element such as VAP Averaging Pitots or HBP Flow Conditioners
  • AP MEASUREMENT: Measurement of Absolute Pressure (integral AP sensor is tied to the low port of the primary flow element)
  • PROCESS SEAL: Our unique method of isolating sensors from the process requires no diaphragm seal and can be further enhanced by using a Purge Seal (Low Volume Continuous Purge coupled directly to transmitter)
  • FLOW ACCURACY: Accuracy of flow measurement as high as +/-0.50% of reading over a 100:1 range in DP and a 10:1 range in flow
  • RANGEABILITY: Can be ranged from 0 to 0.1 in WC up to 0 to 8 in WC
  • RESPONSE TIME: Updates flow calculation 10 times a second
  • FUNCTIONALITY: All measured and calculated variables are available on LCD panel
  • OUTPUT: 4-20 mA Compensated flow output using measured/input values for Differential Pressure, Absolute Pressure and Temperature (Can also be a single variable output)
  • SIMPLICITY: Ae and the 4-20 mA full scale value are set from the LCD panel's push buttons
  • ZERO: Differential Pressure can be zeroed from the LCD/push button interface
  • POWER SUPPLY: Loop Power 8.8 to 42.5 vDC range
  • VERSATILITY: LCD can be rotated independently of the head (LCD rotates 270o and the head can rotate 180o for ultimate adjust-ability)