FH-Series Probe Style with Humidity

fh series probe

FH-Series Probe Overview

FH-Series probe style air velocity, temperature, and humidity sensors are optimized for demanding applications including laboratory, HVAC, high-performance electronics, and more. The FH-Series probe will sense flow from either direction, and sensors are configured-to-order.

The high-performance FH-Series platform uses discrete sensing elements to measure air velocity, temperature, and humidity simultaneously. Designed with conformal-coated electronics and sealed enclosure, robust FH-Series sensors are configured to order with a variety of mechanical lengths, velocity ranges, and output communication styles. The output may be configured as 0-5V, 0-10V, UART, I2C, or choice of analog output augmented with simultaneous digital communication, either UART or I2C. With gland nut or °C Clamp fitting options, FH-Series sensors are easily installed, outside the duct, without the need for hands inside the duct.

Rugged, versatile FH-Series sensors are well suited for critical product and process control applications in HVAC, laboratories and vivariums, pharmaceutical manufacturing, greenhouses, and more.

Innovative “Outside the Duct” Installation

Single hole for mounting sensor assembly, without the need for screws or hands inside the duct

FH400 probe installation steps

Specifications & Details

  • Velocity Range: 0.15 m/s to 20 m/s (30 fpm to 4,000 fpm)
  • Operating Temperature: 0°C to 60°C (32°F to 140°F)
  • Supply Power Requirements: 19 – 29 VDC, 15mA nominal
  • Velocity & Temperature Output: 0-5 V or 0-10 V output
  • Digital Output: UART or I²C available for flow & temperature
  • Alarm Output: Open drain, configurable trip point


Response Time

The response time of a sensor is a measure of how quickly it responds to a change in the input parameter, the variable being measured. It is often defined using T63 which indicates how long it takes the sensor to reach 63.2% of the final value when there is an instant change in the variable being measured. T63 is also known as the sensor time constant and is useful in comparing performance for different types of sensors. Because humidity depends on temperature, a sensor’s relative humidity measurement is correct when that sensor’s temperature has stabilized.



Questions about the FH-Series Probes?

The FH400 is more than an air velocity sensor. It’s a 3-in-1 air velocity sensor, measuring air velocity, air temperature, and relative humidity all together. The output of the FH400 air velocity sensor may be configured as analog, digital, or analog with simultaneous digital communication. Choose from either UART or I2C communication protocols for the digital output. For applications where airflow direction or detection of flow reversals is needed, our 3-in-1 B-Series air velocity sensors measure air velocity, air temperature, and airflow direction in real time. Our friendly and knowledgeable sales team is standing by to answer your questions.
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