Data Acquisition & Logging

Wireless Humidity Sensors

Description Features Configuration Application

The ALTA Wireless Humidity (RH) Sensor allows you to accurately monitor the relative humidity of the air within a room or enclosure.

• Measures relative humidity, temperature and dew point with high accuracy

Principle of Operation

The ALTA Wireless Humidity (RH) Sensor measures the relative humidity at the device. The sensor returns RH and temperature values to the iMonnit Online Sensor Monitoring and Notification System. The system calculates dew point from the data and stores all three data points in the online system where the data can be reviewed and exported as a data sheet or graph. Notifications can be set up through the online system to alert the user when defined thresholds have been met or exceeded.

• Wireless range of 1,200+ feet through 12+ walls *

• Frequency-Hopping Spread Spectrum (FHSS)

• Improved interference immunity

• Improved power management for longer battery life ** (12+ years on AA batteries)

• Encrypt-RF® Security (Diffie-Hellman Key Exchange+AES-128 CBC for sensor data messages)

• Onboard data memory stores up to 512 readings per sensor:

-10-minute heartbeats = 3.5 days

-2-hour heartbeats = 42 days

• Over-the-air updates (future proof)

• Free iMonnit basic online wireless sensor monitoring and notification system to configure sensors, view data and set alerts via SMS text and email

* Actual range may vary depending on environment.

** Battery life is determined by sensor reporting frequency and other variables. Other power options are also available.

ALTA Commercial Coin Cell Wireless Humidity Sensor | Technical Specifications

Supply voltage					2.0–3.8 VDC *
Current consumption					0.2 µA (sleep mode), 0.7 µA (RTC sleep), 570 µA (MCU idle),
					2.5 mA (MCU active), 5.5 mA (radio RX mode), 22.6 mA
					(radio TX mode)
Operating temperature range (board circuitry and coin cell)					-7°C to +55°C (20°F to +131°F)
Optimal battery temperature range (coin cell)					+10°C to +50°C (+50°F to +122°F)
Accuracy					± 2% under normal conditions (0%–80% RH) **
RH operating range					0–100% RH **
RH response time					8 sec (tau 63%) **
Integrated memory					Up to 512 sensor messages
Wireless range					1,200+ ft non-line-of-sight
Security					Encrypt-RF® (256-bit key exchange and AES-128 CTR)
Weight					0.7 ounces

ALTA Commercial AA Wireless Humidity Sensor | Technical Specifications

Supply voltage					2.0–3.8 VDC (3.0–3.8 VDC using power supply) *
Current consumption					0.2 µA (sleep mode), 0.7 µA (RTC sleep), 570 µA (MCU idle),
					2.5 mA (MCU active), 5.5 mA (radio RX mode), 22.6 mA
					(radio TX mode)
Operating temperature range (board circuitry and batteries)					-18°C to 50°C (0°F to 122°F) using alkaline
					-40°C to 80°C (-40°F to 176°F) using lithium
Optimal battery temperature range (AA)					+10°C to +45°C (+50°F to +113°F)
Accuracy					± 2% under normal conditions (0%–80% RH) **
RH operating range					0–100% RH **
RH response time					8 sec (tau 63%) **
Integrated memory					Up to 512 sensor messages
Wireless range					1,200+ ft non-line-of-sight

Security					Encrypt-RF® (256-bit key exchange and AES-128 CTR)
Weight					3.7 ounces

ALTA Industrial Wireless Humidity Sensor | Technical Specifications

Supply voltage		2.0–3.8 VDC (3.0–3.8 VDC using power supply) *
Current consumption		0.2 µA (sleep mode), 0.7 µA (RTC sleep), 570 µA (MCU idle),
		2.5 mA (MCU active), 5.5 mA (radio RX mode), 22.6 mA (radio
		TX mode)
Operating temperature range (board circuitry and battery)		-40°C to +80°C (-40°F to +176°F)
Included battery	Max temperature range	-40° to +80°C (-40° to +176°F)
	Capacity	1500 mAh
Optional solar feature	Solar panel	5VDC/30mA (53mm x 30mm)
	Charging temperature range	0° to 45°C (32° to 113°F)
	Max temperature range	-20° to 60°C (-4° to 140°F)
	Included rechargeable battery	600 mAh/>2000 charge cycles (80% of initial capacity)
	Solar efficiency	Optimized for high and low-light operation **
	Charging efficiency	40% ****
	Luminous sustainability	Minimum of 250 LUX ****
Accuracy		± 2% under normal conditions (0%–80% RH) ***
RH operating range		0–100% RH ***
RH response time		8 sec (tau 63%) ***
Integrated memory		Up to 512 sensor messages
Wireless range		1,200+ ft non-line-of-sight
Security		Encrypt-RF® (256-bit key exchange and AES-128 CTR)
Weight		4.7 ounces
Enclosure rating		NEMA 1, 2, 4, 4x, 12 and 13 rated, sealed and weather proof
UL rating		UL Listed to UL508-4x specifications (File E194432)

Example Interfacing

Greenhouse humidity monitoring
Agriculture environmental monitoring
Art gallery and museum environmental monitoring
Humidor monitoring
General weather and environmental monitoring
Many additional applications

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