Humidity Sensors

Humidity sensors are used to measure the amount of water vapor present in the air, providing critical data for environmental monitoring and control systems. RSP Supply carries a full line of humidity sensors designed to measure relative humidity and, in some configurations, absolute humidity, temperature, or dew point. These sensors are commonly used in industrial facilities, HVAC systems, cleanrooms, laboratories, storage areas, and agricultural environments where moisture control is essential.

High-performance humidity sensors are engineered for accuracy, stability, and repeatable performance across changing temperature and moisture conditions. By continuously monitoring humidity levels, these sensors enable automated systems to regulate ventilation, cooling, heating, and dehumidification processes. This helps maintain consistent environmental conditions that protect sensitive equipment, preserve product quality, and improve energy efficiency.

Humidity sensors are available using different sensing technologies, including capacitive and resistive designs. Capacitive humidity sensors are widely used due to their broad measurement range and long-term stability, while resistive sensors provide reliable detection through changes in electrical resistance caused by moisture. Selecting the appropriate sensor depends on accuracy requirements, environmental exposure, and application-specific performance needs.

Found 691 items
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Found 691 items
Manufacturer
ACI (677)
Dwyer Instruments (8)
Panduit (6)
Component
Fluid Leak Sensor (3)
Humidity (677)
Humidity Sensor (3)
Humidity Switch (5)
Humidity Transmitter (3)
(Instrument-Sensor) Measurement Accuracy
1% (99)
2% (261)
3% (232)
5% (9)
(Instrument-Sensor) Mounting
Duct (119)
Wall Plate (28)
(Instrument-Sensor) Output Signal Range
0 - 5 VDC (8)
0 - 10 VDC (12)
0-5 VDC (72)
0-10 VDC (72)
1 - 5 VDC (1)
2 - 10 VDC (30)
4 - 20 mAmp (166)
(Instrument-Sensor) NEMA Protection
NEMA 3R (33)
NEMA 4X (84)
(Instrument-Sensor) Supply Voltage
115 VAC (5)
230 VAC (5)
(Instrument-Sensor) Temperature Range
32 - 158°F/0 - 70°C (5)
Normally In Stock
ACI 122661 A/RH2-CP-D Duct Humidity
Free U.S Ground shipping
$221.76
$184.80
Normally In Stock
ACI 138320 A/RH2-1.8K-SP-010 Wall Plate Humidity
Free U.S Ground shipping
$221.26
$184.38
Normally In Stock
ACI 122687 A/RH2-D Duct Humidity
Free U.S Ground shipping
$215.21
$179.34
Normally In Stock
ACI 122882 A/RH3-CP-O Outside Air Humidity
Free U.S Ground shipping
$191.02
$159.18
Normally In Stock
ACI 122792 A/RH3-TT1K-D-4X-4 Duct NEMA 4X Humidity
Free U.S Ground shipping
$256.03
$213.36
Normally In Stock
ACI 122913 A/RH3-CSI-O Outside Air Humidity
Free U.S Ground shipping
$179.93
$149.94
Normally In Stock
ACI 122590 A/RH2-TT1K-D-4X-4 Duct NEMA 4X Humidity
Free U.S Ground shipping
$286.27
$238.56
Normally In Stock
ACI 122708 A/RH2-R Room Humidity
Free U.S Ground shipping
$211.18
$175.98
Normally In Stock
ACI 126182 A/RH1-TT1K-O-4X-4 Outside Air NEMA 4X Humidity
Free U.S Ground shipping
$449.57
$374.64
Normally In Stock
ACI 131093 A/RH3-10K-E1-D-3.25"-EH Duct Humidity
Free U.S Ground shipping
$173.88
$144.90
Normally In Stock
ACI 146522 BN2130-R2
Free U.S Ground shipping
$235.44
$196.20
Normally In Stock
ACI 148191 A/RH2-R-NIST Room Humidity
Free U.S Ground shipping
$250.49
$208.74
Normally In Stock
ACI 133793 A/RH3-10K-E1-R2 Room Humidity
Free U.S Ground shipping
$170.35
$141.96
Normally In Stock
ACI 137072 A/RH3-CP-O-SUN Outside Air Humidity
Free U.S Ground shipping
$374.47
$312.06
Normally In Stock
ACI 151393 Humidistat Duct
Free U.S Ground shipping
$57.52
$47.93
Normally In Stock
ACI 122922 A/RH3-D-010 Relative Humidity Sensor
Free U.S Ground shipping
$179.42
$149.52
Normally In Stock
Dwyer HHT-EU-LCD Transmitter
Free U.S Ground shipping
$2245.26
$1871.05
Normally In Stock
ACI CONFIGNIST80 A/RH1-CP-D-NIST Relative Humidity Sensor
Free U.S Ground shipping
$489.38
$407.82
Normally In Stock
ACI CONFIGNIST65 A/RH2-CP-D-NIST Relative Humidity Sensor
Free U.S Ground shipping
$344.74
$287.28
Normally In Stock
ACI 152898 A/RH2-TTM1K-D-4X-2-5PTNIST Relative Humidity Sensor
Free U.S Ground shipping
$400.18
$333.48
Normally In Stock
ACI 152961 A/RH2-AN-R2SO-A03-B4 Relative Humidity Sensor
Free U.S Ground shipping
$250.99
$209.16
Normally In Stock
ACI CONFIGNIST67 A/RH2-CP-O-NIST Relative Humidity Sensor
Free U.S Ground shipping
$352.80
$294.00
Normally In Stock
ACI CONFIGNIST68 A/RH2-CP-O-SUN-NIST Relative Humidity Sensor
Free U.S Ground shipping
$650.66
$542.22
Normally In Stock
ACI 142736 A/RH3-AN-O-BB Relative Humidity Sensor
Free U.S Ground shipping
$184.46
$153.72
Normally In Stock
ACI CONFIGNIST87 A/RH2-100-2W-R-NIST Relative Humidity Sensor
Free U.S Ground shipping
$289.80
$241.50
Normally In Stock
ACI CONFIGNIST74 A/RH3-CP-R-NIST Relative Humidity Sensor
Free U.S Ground shipping
$286.27
$238.56
Normally In Stock
ACI 152943 A/RH3-AN-RS-A03-B4 Relative Humidity Sensor
Free U.S Ground shipping
$235.37
$196.14
Normally In Stock
ACI CONFIGNIST73 A/RH3-20K-R-NIST Relative Humidity Sensor
Free U.S Ground shipping
$243.43
$202.86
Normally In Stock
ACI CONFIGNIST97 A/RH2-CP-R2-NIST Relative Humidity Sensor
Free U.S Ground shipping
$310.97
$259.14
Normally In Stock
ACI 152887 A/RH2-CP-R2S-A02-G5 Relative Humidity Sensor
Free U.S Ground shipping
$93.24
$77.70
Normally In Stock
ACI 152875 A/RH3-AN-R2SO-A18-G5 Relative Humidity Sensor
Free U.S Ground shipping
$93.74
$78.12
Normally In Stock
Panduit EC001 Three-Temperature and Humidity Sensor
Free U.S Ground shipping
$410.89
$342.41
Normally In Stock
Panduit EB001 Temperature and Humidity Sensor
Free U.S Ground shipping
$366.97
$305.81
Normally In Stock
Panduit EE001 Spot Type Fluid Leak Sensor
Free U.S Ground shipping
$840.67
$700.56
Normally In Stock
Panduit EG001 Rope Fluid Leak Sensor
Free U.S Ground shipping
$511.27
$426.06
Normally In Stock
Panduit ED001 Rope Type Fluid Leak Sensor
Free U.S Ground shipping
$942.60
$785.50
Normally In Stock
Panduit EA001 Temperature and Humidity Sensor
Free U.S Ground shipping
$188.17
$156.81
Normally In Stock
ACI 151433 RH Sun Shield Platinum RTDs
Free U.S Ground shipping
$437.98
$364.98
Normally In Stock
ACI 151590 RH Room Thermistor
Free U.S Ground shipping
$172.87
$144.06
Normally In Stock
ACI 151591 RH TT Room
Free U.S Ground shipping
$263.09
$219.24
Normally In Stock
ACI 151595 RH Duct Thermistor
Free U.S Ground shipping
$173.88
$144.90
Normally In Stock
ACI 151618 RH Duct Thermistor
Free U.S Ground shipping
$201.10
$167.58
Normally In Stock
ACI 151653 RH Room Thermistor
Free U.S Ground shipping
$172.87
$144.06
Normally In Stock
ACI 152478 Relative Humidity, RH Outputs: 0-5VDC (Default)
Free U.S Ground shipping
$332.64
$277.20
Normally In Stock
ACI 152305 Relative Humidity, RH Outputs: 0-5
Free U.S Ground shipping
$405.72
$338.10
Normally In Stock
ACI 152376 Relative Humidity, RH Outputs: 0-5
Free U.S Ground shipping
$227.30
$189.42
Normally In Stock
ACI 152522 Relative Humidity, RH Outputs: 0-5
Free U.S Ground shipping
$253.51
$211.26
Normally In Stock
ACI 152452 Relative Humidity, RH Outputs: 0-5
Free U.S Ground shipping
$219.24
$182.70

More Information about Humidity Sensors

In high-performance applications, humidity sensors are calibrated for accuracy and stability, which allows them to perform consistently in warm and wet-to-dry environments. These devices are used to monitor humidity levels in cleanrooms, storage facilities, greenhouses, and laboratories. By enabling systems to automatically adjust ventilation, air conditioning, or dehumidification functions, these same sensors contribute to better comfort, product quality, and energy efficiency. The ability to continuously measure the water vapor content in these dynamic environments gives the sensors an important role in maintaining the balance of temperature and humidity.

FAQs

Q: What is a humidity sensor, and what does it measure?
A humidity sensor measures the amount of moisture in the air, typically reported as relative humidity (RH). Some sensors also measure temperature or dew point to support environmental control systems.

Q: What are humidity sensors commonly used for?
Humidity sensors are used in HVAC systems, building automation, manufacturing, cleanrooms, data centers, agriculture, pharmaceuticals, food storage, and other environments where moisture control affects performance or safety.

Q: What types of humidity sensors are available?
Common humidity sensor types include capacitive, resistive, and thermal conductivity-based sensors. Capacitive sensors are the most widely used due to their accuracy and stability.

Q: How accurate are humidity sensors?
Humidity sensor accuracy typically ranges from ±1% to ±5% RH, depending on sensor quality, design, and operating conditions.

Q: Do humidity sensors require calibration and maintenance?
Yes, periodic calibration and inspection are recommended to maintain accuracy and detect sensor drift or contamination over time.

 

Why Buy Humidity Sensors from RSP Supply

RSP Supply offers a reliable selection of humidity sensors designed for precise environmental monitoring in industrial and commercial applications. Our products support accurate humidity measurement, system efficiency, and long-term reliability. Customers rely on RSP Supply for technically sound sensor solutions, knowledgeable support, and dependable sourcing for environmental control components