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| Product Datasheet | Download PDF | |
| Installation Guide | Download PDF |
An outdoor relative humidity and temperature sensor is an electrical device using digital polymer sensing technology to measure the amount of moisture (relative humidity) and the ambient temperature in the outdoor environment. The sensor transmits the data to a Building Automation System to control economizers, fans, mechanical heating and cooling to provide optimal indoor comfort for occupants and ensure HVAC equipment is running efficiently.
The AcuHUM OA/OAW monitors outdoor relative humidity and dry-bulb temperature. This data can be used to calculate the enthalpy of the outside air to control economizers in air handling units. The calculated outdoor enthalpy will be used to determine if the conditions are ideal to use outdoor air for more efficient cooling instead of mechanical air conditioning. Using outdoor air for cooling has significant energy savings and improved indoor air quality.
Washdown applications are often integrated into industrial operations where the equipment must be regularly cleaned. The AcuHUM OA/OAW sensor monitors the RH conditions to prevent microbial growth to maintain environmental compliance and maintain product quality. The sensor comes standard with an IP65 gasketed enclosure providing robust protection against water and moisture, ideal for a low-pressure water jet in a washdown application.
The AcuHUM OA/OAW readings can be used to calculate dew points, help prevent condensation in industrial facilities and sensitive equipment, and also optimize energy usage of mechanical cooling systems and dehumidifiers. Managing the dew point is crucial for improving indoor air quality and occupant comfort by preventing bacterial growth and reducing the risk of mold.
 Economizer Control |
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The AcuHUM OA/OAW monitors outdoor relative humidity and dry-bulb temperature. This data can be used to calculate the enthalpy of the outside air to control economizers in air handling units. The calculated outdoor enthalpy will be used to determine if the conditions are ideal to use outdoor air for more efficient cooling instead of mechanical air conditioning. Using outdoor air for cooling has significant energy savings and improved indoor air quality
 Washdown Applications |
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Washdown applications are often integrated into industrial operations where the equipment must be regularly cleaned. The AcuHUM OA/OAW sensor monitors the RH conditions to prevent microbial growth to maintain environmental compliance and maintain product quality. The sensor comes standard with an IP65 gasketed enclosure providing robust protection against water and moisture, ideal for a low-pressure water jet in a washdown application.
 Calculating Dew Point |
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The AcuHUM OA/OAW readings can be used to calculate dew points, help prevent condensation in industrial facilities and sensitive equipment, and also optimize energy usage of mechanical cooling systems and dehumidifiers. Managing the dew point is crucial for improving indoor air quality and occupant comfort by preventing bacterial growth and reducing the risk of mold.
AcuHUM-OA-A-A | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
 | 4-20mA | 10KΩ, Type III Thermistor | ±2% | ±0.3°C @ 25°C (±0.54°F @ 77°F) | CE |
| 4-20mA | 10KΩ, Type II Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 4-20mA | 20KΩ Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 4-20mA | 1KΩ Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 4-20mA | 100Ω Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 4-20mA | 1KΩ Nickel RTD | ±2% | ±0.5°C @ 25°C (±0.9°F @ 77°F) | CE |
AcuHUM-OA-A-B | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
| | 4-20mA | Transmitter, 1KΩ Platinum RTD, -40~60°C (-40-140°F) | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
| 4-20mA | Transmitter, 1KΩ Platinum RTD, Customize Range | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
AcuHUM-OA-A-D | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
| | 4-20mA | No Temperature Output | ±2% | N/A | CE |
AcuHUM-OA-B-A | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
| | 0-10VDC | 10KΩ, Type III Thermistor | ±2% | ±0.3°C @ 25°C (±0.54°F @ 77°F) | CE |
| 0-10VDC | 10KΩ, Type II Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 0-10VDC | 20KΩ Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 0-10VDC | 1KΩ Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 0-10VDC | 100Ω Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 0-10VDC | 1KΩ Nickel RTD | ±2% | ±0.5°C @ 25°C (±0.9°F @ 77°F) | CE |
AcuHUM-OA-B-C | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
| | 0-10VDC | Transmitter, 1KΩ Platinum RTD, -40~60°C (-40-140°F) | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
| 0-10VDC | Transmitter, 1KΩ Platinum RTD, Customize Range | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
AcuHUM-OA-B-D | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
| | 0-10VDC | No Temperature Output | ±2% | N/A | CE |
AcuHUM-OAW-A-A | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
 | 4-20mA | 10KΩ, Type III Thermistor | ±2% | ±0.3°C @ 25°C (±0.54°F @ 77°F) | CE |
| 4-20mA | 10KΩ, Type II Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 4-20mA | 20KΩ Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 4-20mA | 1KΩ Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 4-20mA | 100Ω Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 4-20mA | 1KΩ Nickel RTD | ±2% | ±0.5°C @ 25°C (±0.9°F @ 77°F) | CE |
AcuHUM-OAW-A-B | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
| | 4-20mA | Transmitter, 1KΩ Platinum RTD, -40~60°C (-40-140°F) | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
| 4-20mA | Transmitter, 1KΩ Platinum RTD, Customize Range | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
AcuHUM-OAW-A-D | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
| | 4-20mA | No Temperature Output | ±2% | N/A | CE |
AcuHUM-OAW-B-A | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
| | 0-10VDC | 10KΩ, Type III Thermistor | ±2% | ±0.3°C @ 25°C (±0.54°F @ 77°F) | CE |
| 0-10VDC | 10KΩ, Type II Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 0-10VDC | 20KΩ Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 0-10VDC | 1KΩ Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 0-10VDC | 100Ω Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE | |
| 0-10VDC | 1KΩ Nickel RTD | ±2% | ±0.5°C @ 25°C (±0.9°F @ 77°F) | CE |
AcuHUM-OAW-B-C | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
| | 0-10VDC | Transmitter, 1KΩ Platinum RTD, -40~60°C (-40-140°F) | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
| 0-10VDC | Transmitter, 1KΩ Platinum RTD, Customize Range | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
AcuHUM-OAW-B-D | RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|---|
| | 0-10VDC | No Temperature Output | ±2% | N/A | CE |
AcuHUM-OA-A-A |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 4-20mA | 10KΩ, Type III Thermistor | ±2% | ±0.3°C @ 25°C (±0.54°F @ 77°F) | CE |
| 4-20mA | 10KΩ, Type II Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 4-20mA | 20KΩ Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 4-20mA | 1KΩ Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 4-20mA | 100Ω Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 4-20mA | 1KΩ Nickel RTD | ±2% | ±0.5°C @ 25°C (±0.9°F @ 77°F) | CE |
AcuHUM-OA-A-B |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 4-20mA | Transmitter, 1KΩ Platinum RTD, -40~60°C (-40-140°F) | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
| 4-20mA | Transmitter, 1KΩ Platinum RTD, Customize Range | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
AcuHUM-OA-A-D |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 4-20mA | No Temperature Output | ±2% | N/A | CE |
AcuHUM-OA-B-A |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 0-10VDC | 10KΩ, Type III Thermistor | ±2% | ±0.3°C @ 25°C (±0.54°F @ 77°F) | CE |
| 0-10VDC | 10KΩ, Type II Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 0-10VDC | 20KΩ Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 0-10VDC | 1KΩ Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 0-10VDC | 100Ω Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 0-10VDC | 1KΩ Nickel RTD | ±2% | ±0.5°C @ 25°C (±0.9°F @ 77°F) | CE |
AcuHUM-OA-B-C |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 0-10VDC | Transmitter, 1KΩ Platinum RTD, -40~60°C (-40-140°F) | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
| 4-20mA | Transmitter, 1KΩ Platinum RTD, Customize Range | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
AcuHUM-OA-B-D |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 0-10VDC | No Temperature Output | ±2% | N/A | CE |
AcuHUM-OAW-A-A |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 4-20mA | 10KΩ, Type III Thermistor | ±2% | ±0.3°C @ 25°C (±0.54°F @ 77°F) | CE |
| 4-20mA | 10KΩ, Type II Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 4-20mA | 20KΩ Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 4-20mA | 1KΩ Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 4-20mA | 100Ω Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 4-20mA | 1KΩ Nickel RTD | ±2% | ±0.5°C @ 25°C (±0.9°F @ 77°F) | CE |
AcuHUM-OAW-A-B |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 4-20mA | Transmitter, 1KΩ Platinum RTD, -40~60°C (-40-140°F) | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
| 4-20mA | Transmitter, 1KΩ Platinum RTD, Customize Range | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
AcuHUM-OAW-A-D |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 4-20mA | No Temperature Output | ±2% | N/A | CE |
AcuHUM-OAW-B-A |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 0-10VDC | 10KΩ, Type III Thermistor | ±2% | 0.3°C @ 25°C (0.54°F @ 77°F) | CE |
| 0-10VDC | 10KΩ, Type II Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 0-10VDC | 20KΩ Thermistor | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 0-10VDC | 1KΩ Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 0-10VDC | 100Ω Platinum RTD | ±2% | ±0.2°C @ 25°C (±0.36°F @ 77°F) | CE |
| 0-10VDC | 1KΩ Nickel RTD | ±2% | ±0.5°C @ 25°C (±0.9°F @ 77°F) | CE |
AcuHUM-OAW-B-C |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 0-10VDC | Transmitter, 1KΩ Platinum RTD, -40~60°C (-40-140°F) | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
| 4-20mA | Transmitter, 1KΩ Platinum RTD, Customize Range | ±2% | <±0.3°C @ 5~60°C (<±0.54°F @ 41~140°F) | CE |
AcuHUM-OAW-B-D |
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RH Output | Temperature | RH Accuracy | Temperature | Certification |
|---|---|---|---|---|
| 0-10VDC | No Temperature Output | ±2% | N/A | CE |
Both AcuHUM OA and AcuHUM OAW offer high-accuracy RH measurement with temperature measuring options via thermistor or RTD. They both come with IP65 rated enclosures, except AcuHUM OAW also features a six-layered weather shield, providing extra protection against solar radiation and dust/water ingression.
Customers should choose AcuHUM OAW if the sensor needs to be installed under direct sunlight. The weather shield reduces the thermal effect of direct sunlight, shortens response time, and ensures accurate measurement under long-term outdoor conditions.
Yes, AcuHUM OA/OAW sensor automatically compensates for the temperature effect when measuring the relative humidity level, delivering accurate data that reflects real air condition.
AcuHUM OA/OAW offers full range of RH measurement from 0% to 100%, which is mapped to analog outputs either 0-10VDC or 4-20mA, with ±2% accuracy from 20% to 80% RH at 25°C.
All RH sensors experience drifting over a long period of time. AcuHUM offers a low drift rate of less than ±0.5% RH/Year, ensuring long-term stability and performance.
In a typical office building or commercial space, the sensor should last up to 10 years under normal operating conditions. Extreme environmental conditions, such as high humidity and temperature, will impact sensor lifespan. Any exposure to chemicals like chlorine, cleaners, solvents, or other corrosive agents will shorten the lifespan of the sensor and void the warranty of the product.
The sensor employs digital polymer sensing technology that incorporates a capacitive RH sensing element, delivering faster response time, better accuracy across the entire measurement range, and better long-term stability.
