7Semi SHT40 Humidity and Temperature Sensor Probe, ±1.8 %RH, 14mm dia., 93mm length - I2C Interface
SKU: SENS-3329
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7Semi SHT40 Humidity and Temperature Sensor Probe, ±1.8 %RH, 14mm dia., 93mm length - I2C Interface

₹859.00 (Inclusive of all taxes)
Out of Stock

The 7Semi SHT40 is a high-precision digital humidity and temperature sensor probe designed for demanding industrial and embedded applications. Featuring a robust stainless-steel porous housing and an I2C interface (address 0x44), it provides reliable 16-bit measurements from -40°C to 125°C and 0-100% RH, compatible with 3.3V systems like Raspberry Pi, ESP32, and STM32 microcontrollers.

Features

  • High-precision digital sensing with ±1.8% RH and ±0.2°C typical accuracy.
  • Robust stainless-steel porous probe housing rated for pressures up to 150 bar.
  • Ultra-low power consumption (~80 nA idle) ideal for battery-powered systems.
  • Integrated heater for enhanced accuracy in condensing or rapidly changing environments.
  • Simple I2C interface (address 0x44) for easy integration with microcontrollers and SBCs.

Out of stock

Description

The 7Semi SHT40 probe utilizes a capacitive polymer sensing element for humidity and a band-gap sensor for temperature, delivering calibrated 16-bit digital output via a standard I2C bus. Its stainless-steel porous filter protects the sensing core from dust, moisture, and corrosive contaminants, ensuring long-term stability in harsh industrial environments such as HVAC ducts, process control, and outdoor monitoring stations.

Engineered for reliability, the sensor includes an on-chip heater that can be activated to clear condensation or perform diagnostics. Operating from a 1.08V to 3.6V supply, it is perfectly suited for low-voltage embedded systems and portable data loggers where power efficiency and measurement integrity are critical.

Key Features

  • High-Accuracy Sensing: Delivers typical accuracy of ±1.8% RH and ±0.2°C over the full measurement range.
  • Industrial-Grade Durability: Porous stainless-steel housing provides IP68-equivalent protection against dust, moisture, and corrosion, withstanding pressures up to 150 bar.
  • Ultra-Low Power Architecture: Features an idle current as low as 80 nA, enabling deployment in energy-harvesting and long-life battery applications.
  • Integrated Diagnostic Heater: Built-in heater ensures reliable operation in high-humidity conditions by preventing and clearing condensation on the sensor element.
  • Digital I2C Interface: Provides a simple, two-wire communication protocol with a fixed address (0x44) for straightforward system integration.
  • Wide Operating Range: Functions reliably from -40°C to 125°C, suitable for extreme environmental monitoring.
  • Factory Calibrated: Each sensor is individually calibrated and features a traceable serial number for quality assurance.

Applications

  • Industrial HVAC and building automation system monitoring for precise climate control.
  • Environmental data logging in weather stations and agricultural monitoring networks.
  • Process control and condition monitoring in pharmaceutical or food production facilities.
  • Embedded sensing in portable medical devices and laboratory equipment.
  • Durability testing within automotive and aerospace environmental chambers.

Technical Specifications

Sensor TypeDigital Humidity & Temperature
Humidity Range0 to 100 %RH
Humidity Accuracy±1.8 %RH (typical)
Temperature Range-40°C to 125°C
Temperature Accuracy±0.2°C (typical)
Output InterfaceI2C
I2C Address0x44
Supply Voltage1.08 V to 3.6 V DC
Idle Current~80 nA
Probe HousingPorous Stainless Steel
Pressure ResistanceUp to 150 bar
Probe Diameter14 mm
Cable Length93 mm
Connector TypeMini Round Shell (MRS)
Pinout (Cable)Red: VCC, Black: GND, Yellow: SDA, Green: SCL

Frequently Asked Questions

What is the I2C address of the SHT40 probe and how do I change it?

The 7Semi SHT40 probe has a fixed I2C address of 0x44, which cannot be changed via software or hardware. For systems requiring multiple sensors, you must use an I2C multiplexer (e.g., TCA9548A) to manage separate bus segments, as the address is hard-coded by the Sensirion SHT40 chip inside the probe.

Can this sensor probe operate on a 5V Arduino system?

No, the SHT40 probe's supply voltage range is 1.08V to 3.6V. Applying 5V will damage the sensor. For use with 5V logic systems like some Arduino boards, you must power the probe from a 3.3V regulator and use a logic level converter for the I2C lines (SDA, SCL) to ensure safe communication.

What is the purpose of the integrated heater and how is it controlled?

The integrated heater serves two main purposes: it can clear condensation from the sensor element to restore accuracy in high-humidity environments, and it can be used for diagnostic checks. The heater is controlled via specific I2C commands documented in the Sensirion SHT40 datasheet, allowing you to activate it at different power levels for short durations.

Is the probe cable directly solderable, and what is the pinout?

The probe terminates in a Mini Round Shell (MRS) connector. The attached 93mm cable has four color-coded wires: Red (VCC), Black (GND), Yellow (SDA), and Green (SCL). For permanent installation, you can solder these wires directly to your PCB or use a compatible MRS socket. Ensure correct polarity and avoid exposing the solder joints to strain.

Package Includes

  • 1 x 7Semi SHT40 Humidity and Temperature Sensor Probe

Additional Information

Weight 0.06 kg
Dimensions 7 × 9 × 2 cm

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