This Product Selection Guide contains information to help select products in the Humidity, Moisture Sensors category on DigiKey.com
Moisture Sensors are designed to detect and respond to the presence or a change in the amount of humidity along with Pressure, Temperature, and Light. The output types are Analog Voltage, Capacitance, Digital, Frequency, I2C, LCD Display, LCD, PDM, PWM, Resistive, SDM, SPI, ZACwire, and ZigBee with accuracy ranging from ±1.5% RH to ±7% RH.
SelectionCharacteristics
Specifications to determine which humidity or moisture sensor is right for your application.
Sensor Type: Designates which parameters can be measured by the sensor, such as humidity, moisture, temperature, etc.
Humidity Range: The operating humidity range specified for the part. May differ from the humidity range over which the indicated accuracy applies.
Output Type: Indicates the type of electrical signal the device provides, such as digital, analog, etc.
Output: The specific output or range of outputs the sensor outputs, such as 0-10V, 4mA-20mA, 5V@100%RH, etc.
Accuracy: Typically listed as +/- a percentage of relative humidity (RH), this is the amount of deviation that may occur from a perfect reading of the sensor. For example if the accuracy is +/-2%RH the reading given by the sensor may be higher or lower than the relative humidity by 2%.
Response Time: How quickly the sensor can read changes in the moisture or humidity level. If the level of moisture or humidity changes faster than the response time some values will be missed or incorrect. It is important to select a sensor that can detect changes faster than they occur in order to get the most accurate results from the sensor.
Sensitivity: The amount of change in the output per unit of input. For example if the sensitivity is 25mV/%RH the output will change by 25mV for every 1%RH of change in the input.
Voltage - Supply: Typically represented by a range, this indicates the low and high voltage limits which one can expect standard operation. Voltages outside this range may damage the device and other system components.
Mounting Type: Indicates how the device is attached.
Operating Temperature: Recommended operating temperature, typically given in a range or as a maximum. Exceeding these temperatures may affect performance or damage the device and other system components.
Package/Case: Indicates the type of protective case used on an electronic component to allow easy handling, installation, and protection. This selection was determined to be the closest industry standard applicable to the suppliers device packaging. Typically it is best to check the actual dimensions from the datasheet rather than depend on this terminology when designing your circuit.
Supplier Device Package: This is what the manufacturer calls the package of this device. They are manufacturer specific. It is typically best to use the actual dimensions from the datasheets rather than to go by this terminology when designing your circuit.
ProductExamples
| MFR PART # | HPP805D033 |
|---|---|
| DIGI-KEY PART # | HPP805D033-ND |
| MANUFACTURER | TE Connectivity Measurement Specialties |
| DESCRIPTION | Humidity Temperature Sensor 0 ~ 100% RH Analog Voltage ±3% RH 10 s User Defined |
| DATASHEET | Click Here |
| MFR PART # | SHT40-AD1B-R3 |
|---|---|
| DIGI-KEY PART # | 1649-SHT40-AD1B-R3TR-ND - Tape & Reel (TR) |
| MANUFACTURER | Sensirion AG |
| DESCRIPTION | Humidity Temperature Sensor 0 ~ 100% RH I²C ±1.8% RH 6 s Surface Mount |
| DATASHEET | Click Here |
| MFR PART # | HIH6030-021-001 |
|---|---|
| DIGI-KEY PART # | 480-5704-2-ND - Tape & Reel (TR) |
| MANUFACTURER | Honeywell Sensing and Productivity Solutions |
| DESCRIPTION | Humidity Temperature Sensor 0 ~ 100% RH I²C ±4.5% RH 6 s Surface Mount |
| DATASHEET | Click Here |
| MFR PART # | T9602-3-D |
|---|---|
| DIGI-KEY PART # | 235-1563-ND |
| MANUFACTURER | Amphenol Telaire |
| DESCRIPTION | Humidity Temperature Sensor 0 ~ 95% RH I²C ±2% RH 29 s User Defined |
| DATASHEET | Click Here |
| MFR PART # | 101990792 |
|---|---|
| DIGI-KEY PART # | 1597-101990792-ND |
| MANUFACTURER | Seeed Technology Co., Ltd |
| DESCRIPTION | Humidity Temperature Sensor 0 ~ 100% RH ±2% User Defined |
| DATASHEET | Click Here |
| MFR PART # | PIM520 |
|---|---|
| DIGI-KEY PART # | 1778-PIM520-ND |
| MANUFACTURER | Pimoroni Ltd |
| DESCRIPTION | Humidity Temperature Sensor Frequency User Defined |
| DATASHEET | NONE |
MediaLinks
Videos
REED Instruments Moisture Meters
Moisture Sensing for Smart Agriculture
Little Shop of Moistures Sensors with ADI
Videos on Humidity Sensors
Articles
Humidity Sensors and Signal Conditioning Choices
Careful Sensor Selection Desirable Outcomes
Articles on Humidity Sensors
Product Training Modules
Product Training Modules on Humidity Sensors
TechForum
TechForum posts on Moisture Sensors
TechForum posts on Humidity Sensors