FHT20 Series

Product catalog summary

Overview: The FHT20 series by Focusens is designed for HVAC applications, offering a cost-effective, accurate, and reliable solution for measuring relative humidity and temperature. The device features a robust enclosure that minimizes installation costs and protects against contamination and condensation.

Specifications:

Sensor Element: Utilizes the Sensirion SHT21 sensor for long-term stability and pollutant resistance.
Measurement Accuracy: ±3% RH and ±0.3°C 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 for humidity (63% response).
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 Capacity: 2-wire: (VDD - 7V) / 0.02A; 3-wire: Current mode less than 500Ω, Voltage mode greater than 10kΩ.
Protection: IP65 rated with a membrane filter for sensor protection.
Housing Material: Polycarbonate.

Ordering Guide:

Series: FHT20
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 Option: D (LCD).

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

FHT20 Series Humidity and Temperature Transducer for HVAC Applications(wall-mounted) Specially designed for HVAC, the FHT20 series by Focusens is a cost effective, highly accurate and reliable solution for measuring relative air humidity and temperature. 9 The enclosure minimizes installation costs and provides outstanding / protection against contamination and condensation, thus ensuring flawless operation. The FHT20 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 FHT20 provides a measurement accuracy of ±3%RH and is available for wall-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 FHT20 V1.0/Modification rights reserved www.focusens.com

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FHT20 Series Humidity and Temperature Transducer for HVAC Applications(wall-mounted) Connection Diagram Rload RH / T Ordering Guide SERIES 2-wire current mode 4...20mA 3-wire current mode 4...20mA 3-wire voltage mode 0...10V 3-wire voltage mode 0...5V 3-wire voltage mode 0...1V FHT20 V1.0/Modification rights reserved www.focusens.com

Open the catalog to page 2

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