FHT31 Series

Product catalog summary

Overview: The FHT31 series by Focusens is a cost-effective, accurate, and reliable humidity and temperature transducer designed for HVAC applications. It features a robust enclosure that minimizes installation costs and protects against contamination and condensation.

Specifications:

Sensor Element: Utilizes the Sensirion SHT21 sensor for excellent long-term stability and pollutant resistance.
Measurement Accuracy: ±3% RH for humidity and ±0.3°C for temperature at 25°C.
Stability: Less than 0.1°C/year for temperature and less than 0.5% RH/year for humidity.
Response Time: Less than 15 seconds for temperature and less than 12 seconds (63%) for humidity.
Power Supply: 2-wire (12-24V) and 3-wire (15-24V) options.
Output Options: 2-wire current mode (4-20mA), 3-wire current mode (4-20mA), and 3-wire voltage mode (0-1/5/10V).
Load: 2-wire: (VDD - 7V) / 0.02A; 3-wire: Current mode less than 500Ω, Voltage mode greater than 10kΩ.
Protection: Sensor protection with a membrane filter and housing material made of polycarbonate with IP65 protection grade.

Ordering Guide:

Series: FHT31
Output Options: A (2-wire current mode 4-20mA), B (3-wire current mode 4-20mA), D (3-wire voltage mode 0-10V), E (3-wire voltage mode 0-5V), F (3-wire voltage mode 0-1V).
Temperature Scaling: T1 (0 to +50°C), T2 (-40 to +60°C), T3 (-20 to +80°C).
Display: Optional LCD display (D).

Connection Diagram: The document provides a connection diagram for 2-wire current mode, 3-wire current mode, and 3-wire voltage mode configurations.

Catalog excerpts

FHT31 Series Humidity and Temperature Transducer for HVAC Applications(duct-mounted) Specially designed for HVAC, the FHT31 series by Focusens is a cost effective, highly accurate and reliable solution for measuring relative air humidity and temperature. The enclosure minimizes installation costs and provides outstanding protection against contamination and condensation, thus ensuring flawless operation. The FHT31 employs the new humidity / temperature Sensirion sensor element SHT21 with excellent long term stability and resistance against pollutants. In combination with a long calibration experience, the FHT31 provides a measurement accuracy of ±3%RH and is available for duct-mounted with current, voltage output. Technical Data Parameter Measurement Range Accuracy at 25°C Stability Response power supply Output Load Sensor protection Housing material Protection grade Temperature Relative Humidity FHT31 V1.0/Modification rights reserved www.focusens.com

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FHT31 Series Humidity and Temperature Transducer for HVAC Applications(duct-mounted)Connection Diagram Rload 2-wire current mode 3-wire current mode SERIES OUTPUT T-SCALING (A) 2-wire current mode 4...20mA (B) 3-wire current mode 4...20mA (D) 3 -wire voltage mode 0...10V (E) 3 -wire voltage mode 0...5V (F) 3 -wire voltage mode 0...1V FHT31 V1.0/Modification rights reserved www.focusens.com

Open the catalog to page 2

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