Relative humidity and temperature sensor HYT 939

for integrationI2Cbare wires

Overview
Humidity module with a front PTFE membrane filter providing VOC and particle protection for gas-tight TO-39 applications.

Product summary
HYT 939 digital RH/T module with I²C outputs in a gas-tight TO-39 housing. Condensation-safe across 0..100 % RH. Compact, fast and suitable for HVAC, emission monitoring, industrial drying and gas analyzers or compact probes without an extra filter cap. Application-specific calibration and housing design available on request.

Benefits & Characteristics of the HYT 939
Mechanically robust with a chemically and condensation-resistant sensing area. The HYT 939 withstands peak loads at high temperatures and is available in a pressure-resistant version. Precisely calibrated, the module provides ±1.8 % RH and ±0.2 °C accuracy and combines a capacitive polymer humidity sensor with ASIC integration. On-chip linearity and temperature-drift compensation deliver outstanding accuracy and make the module interchangeable without adjustment.

• Calibrated and temperature compensated
• Excellent humidity and temperature accuracy and stability
• High chemical resistance
• I²C protocol (default 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

Quality
Manufactured in Switzerland. IST AG is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environment).

Technical specifications

• Product Name: HYT 939 module with PTFE filter
• Operating humidity range: 0 % RH to 100 % RH
• Operating temperature range: -40 °C to +125 °C
• Accuracy humidity: ±1.8 % RH at +23 °C (0 % RH to 90 % RH)
• Accuracy temperature: ±0.2 °C at 0–60 °C
• Digital interface: I²C, default address 0x28
• Operating voltage: 2.7 V to 5.5 V
• Current consumption: < 1 µA in sleep mode, < 22 µA at 1 Hz measuring rate
• Dimensions: 9 mm × 5.2 mm (Ø × H)
• Connections: TO-39, 4 wires
• Wire dimensions: 13.5 × 0.45 mm (L × Ø)
• Response time: < 10 s
• Filter: PTFE particle filter
• Product code: 154417