Model IAT-DI


GreenFlow GF Series


Insertion Mount Thermal Dispersion Airflow/Temperature Measurement

Probe for Round Ducts

Thermal Dispersion Airflow/Temperature Measurement Probe for Round Ducts

The IAT-DI integrated probe is compatible with GF Series remote transmitters and various GreenTrol application specific controllers. The probe is designed for insertion into small round ducts and is available with a 3, 10, 25 or 50 foot plenum rated cable with connector plug. Available in aluminum or stainless steel. Fits 4 to 16 inch round ducts.

  • Hospital, laboratory and clean room ducts
  • Terminal boxes
  • Outdoor air intakes to fan coils
  • Makeup air ducts to air handlers
Overview PDF



  • Compatible with GreenTrol transmitters and controllers that accept IAT integrated sensors
  • Thermal dispersion technology
  • Calibrated from 0 to 3,000 FPM
  • Stable bead-in-glass thermistor sensors
  • NIST traceable airflow and temperature measurement
  • Calibrated to volumetric airflow standards
  • Accurate and repeatable
  • Field calibration is not required
  • Fits standard 4 to 16 inch round ducts
  • Easy to install insertion probe design
  • Available in aluminum or stainless steel
  • FEP plenum rated cable with terminal DIN connector plug provided


IAT (integrated airflow/temperature) sensors reduce cost by eliminating the redundancy of a separate transmitter for airflow and temperature measurement. The processing circuitry and firmware is integrated into one of GreenTrol’s microprocessor-based transmitters or application specific controllers.

The IAT-DI airflow/temperature sensor is designed for duct insertion applications. Probes are available with one or two sensor nodes. Installed airflow accuracy is ±4% of reading to NIST traceable standards when installed in accordance to published placement guidelines.

The IAT-DI sensor probe uses the principal of thermal dispersion to determine the airflow rate. Thermal dispersion is ideal for HVAC applications that typically require measurement of low air velocities. Each sensing node uses two thermistors to determine airflow. One thermistor is self-heated above ambient while a second thermistor determines the ambient air temperature. The power dissipated into the airstream is directly related to the airflow rate.

Each thermistor body is a hermetically sealed bead-in-glass probe. Bead-in-glass thermistors have demonstrated extreme stability and superior performance over chip type thermistors used by other manufacturers. The bead-in-glass sensor used has been time tested for over 35 years by GreenTrol’s sister company, EBTRON. Thermistors are potted in a waterproof sensor assembly and are designed for years of trouble-free operation.

Each sensing node is individually calibrated at 7 points in high-performance wind tunnels. Transmitters and controllers measure and process each individual sensor node independently. The result is the true average airflow rate and temperature when more than one sensing node is applied.


Airflow Measurement: Provides individual sensor node airflow rates to compatible GreenTrol transmitters and controllers

Temperature Measurement: Provides individual sensor node temperatures to compatible GreenTrol transmitters and controllers


Type: -DI Duct Insertion Thermal Dispersion Airflow and TemperatureMeasurement Probe

Available Configurations

4 inch [102 mm]: 1 probe x 1 sensor node

5 to 16 inch [127 to 406 mm]: 2 probe x 1 sensor nodes

Sensing Node Sensors

Self-heated sensor: Precision, hermetically sealed, bead-in-glass thermistor probe

Temperature sensor: Precision, hermetically sealed, bead-in-glass thermistor probe

Probe Tube

Material: Mill finish 6063 aluminum (optional: 316 SS)

Probe Mounting Brackets

Material: 304 stainless steel

Probe Mounting: Insertion

Sensing Node Housing

Material: Glass-filled Polypropylene

Sensor Potting Materials: Waterproof marine epoxy

Sensing Node Internal Wiring

Sensing Node Internal Wiring: Kynar® coated copper

Probe to Transmitter Cables

Material: FEP jacket, plenum rated CMP/CL2P, UL/cUL listed, -67 to 392 ⁰F [-55 to 200 ⁰C], UV tolerant

Standard Lengths: 3, 10, 25 and 50 ft. [0.91, 3.1, 7.6 and 15.2 m]

Connecting Plug: 0.60” [15.24 mm] nominal diameter

Airflow Measurement

Averaging Method: Independent, arithmetic average

Installed Accuracy: Better than ±4% of reading to NIST traceable airflow standards

Calibrated Range: 0 to 3,000 fpm [0 to 15.24 m/s]

Calibration Points: 7

Temperature Measurement

Averaging Method: Independent, velocity weighted

Accuracy: ±0.15⁰F [0.08 ⁰C]


Environmental Limits

Temperature: -20 to 120 ⁰F [-28.9 to 48.9 ⁰C]

Note: Temperature limits for operation may be limited by the transmitter or controller selected

Humidity: 0 to 100%

Power Requirement: Power is provided by the transmitter or controller and is included in the transmitter/controller power requirement specification

Related Documents

Product Catalog
Data Sheets