Veltron III Pressure and Flow Transmitter

Air Monitor’s VELTRON III is a dual-channel pressure and airflow measurement transmitter that can be combined with any differential or static pressure measurement device, providing reliable and accurate measurement needed for today’s high-performance buildings.

The VELTRON III Pressure & Airflow Transmitter is a multifunctional, dual-channel transmitter specifically designed for HVAC airflow measurement applications. The flexible design can be combined with any differential or static pressure measurement probes, stations, piezo rings, or traverse style fan inlet probes.

The VELTRON III uses an application specific tailored array of precision transducers to provide the best turndown and accuracy needed for today’s high-performance buildings. The unique transducer design eliminates the need for periodic re-zeroing common with traditional differential pressure-based technologies.

Each VELTRON III comes individually calibrated with all settings and outputs preconfigured for the application. Outputs include native BACnet or MODBUS and up to four programmable analog outputs for airflow, temperature, velocity, differential pressure, or absolute ambient pressure.


  • 3% of Reading Accuracy when combined with Air Monitor probes versus traditional percentage of full scale.
  • Dual-Channel capability minimizes the need for multiple transmitters. It can be used for a split system by combining or subtracting two flow rates. Can be used on a dual system by monitoring two independent flow streams.
  • Extended Flow Range: the turndown ratio can be maximized for specific applications to ensure optimal performance using the dual transducer technology.
  • Air Density Compensation – dynamic changes in temperature and barometric pressure can impact readings. Selecting an RTD allows the transmitter to calculate real time air density for ACFM.
  • Field Characterization capability to improve the overall performance of the system. This is accomplished when installed in non-ideal locations.
  • Relative Humidity Adjustment – preconfigured RH scenarios selections for return & supply air. Custom conditions can be entered for a more precise actual airflow measurement (ACFM). This can be done instead of traditional DP transmitters which use dry air conditions to perform air flow rate calculations.
  • BAS/BMS Interface options include up to four programmable analog outputs. One RS485 interface available for native BACnet or MODBUS protocols.
  • Multiple Enclosure Options to accommodate a variety of installation locations with environmental protection requirements.



Dual-Channel or Single Channel Systems for:

  • Building Airflow Measurement:
  • Supply Ducted Air Flow
  • Return Ducted Air Flow
  • Single or Dual Fan Systems
  • Summation or Subtraction of Air Flow

Room Pressurization:

  • Positive and Negative Space Pressurization
  • Fan Discharge Plenum Pressure
  • Multiple Room Pressure Average Sensing
  • Large Duct Pressure