Evaluation board HYT series

Product overview
Arduino-based test board with digital (USB) and analog interfaces supplied as a box set including the HYT271 and HYT939 humidity modules with a general-use calibration. The kit is intended to simplify evaluation of HYT sensor modules under application-relevant conditions and to provide both digital and converted analog outputs for integration tests.

Contents

• 1x Evaluation board
• 1x HYT 271 module
• 1x HYT 939 module
• 1x USB cable

Benefits & Characteristics of the HYT Evaluation Box
The evaluation box enables connection of a HYT module to a PC via USB and, if required, converts the module's digital I²C output to analog signals. It supports functional tests, parameter verification and quick interoperability checks in development or qualification workflows.

Benefits & Characteristics of the HYT 939
The digital iST HYT 939 humidity module features a chemically resistant and condensation-protected sensing area and a robust mechanical design for high-temperature and high-load conditions. It is available in a pressure-tight package for high-pressure applications. The HYT 939 combines a capacitive polymer humidity sensor with an ASIC and delivers calibrated measurements with accuracy of ±1.8 % RH and ±0.2 °C. Measured humidity and temperature are provided as digital values via an I²C-compatible interface. The module is fully interchangeable without adjustment; linearity error and temperature drift are corrected on-chip.

Further advantages of the HYT 939 digital humidity module

• Calibrated and temperature compensated
• Excellent humidity/temperature accuracy and stability
• High chemical resistance
• I²C protocol (address 0x28 or alternative address)
• Wide humidity and temperature range (0 % RH to 100 % RH and -40 °C to +125 °C)
• Very low drift
• Very stable at high humidity
• Interchangeable without adjustments
• Pressure-resistant version (up to 16 bar) upon request

Benefits & Characteristics of the HYT 271
The digital iST HYT 271 humidity module provides a wide application window and a favorable cost-performance ratio while maintaining mechanical robustness and a condensation-resistant sensing area. It combines a capacitive polymer humidity sensor with an ASIC, is precisely calibrated (±1.8 % RH and ±0.2 °C) and delivers relative humidity and temperature via an I²C-compatible digital interface. Linearity error and temperature drift are corrected on-chip, and the module is interchangeable without adjustment.

Option: High-end humidity calibration HYT modules
High-end calibration and measurement setups enable HYT modules to reach accuracies up to ±1.4 % RH. Tailored calibrations can achieve better than ±1.4 % RH within a limited 0–50 % RH range. For dew point or very low humidity applications (0–5 % RH), higher precision (< ±0.5 % RH) is achievable with specific calibrations and setups.

Quality
IST AG is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environment). Documented processes and regular audits support consistent production and quality management.

Technical specifications

• Product name: HYT Evaluation Box
• Product code: 154775
• Operating humidity range: 0 to 100 % RH (modules); < 95 % non condensing (board)
• Operating temperature range: -20 °C to 120 °C (modules); -20 °C to +50 °C (board)
• Humidity accuracy: ±1.8 % RH (0–90 % RH), ±3 % (>90 % RH) at 0–50 °C
• Temperature accuracy: ±0.2 °C @ 0–50 °C
• Digital interface: Board to PC: USB; Board to sensor: I²C
• Operating voltage: 5 V (USB); 4 to 15 V DC
• Current consumption: 50 to 300 mA
• Dimensions (board): 84 x 29 mm (L x W)
• Measured medium: Air/Gas