Data Acquisition & Logging

Wireless Dry Contact Sensors

Description Features Configuration Application

ALTA wireless dry contact sensors can be used to detect contact between two wired contact points, an external mechanical switch or a contact plate.

• 1 ft (12 inches) lead wires

• Can integrate with switches

Principle of Operation

The ALTA wireless dry contact sensor detects when there is contact between the two wired end points. It can easily be integrated into existing switches or contact plates. When the sensor detects contact between the two end points, it will immediately turn on the RF radio and transmit the data to the wireless gateway and iMonnit Online Sensor Monitoring and Notification System, allowing the user to immediately receive an SMS text or email alert. The sensor can be configured to detect both closed and open loops alerting if contact is made or broken.

• 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 Dry Contact 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 +60°C (20°F to +140°F)
Optimal battery temperature range (coin cell)					+10°C to +50°C (+50°F to +122°F)
Lead wire length					1 ft (12 in)
Detection wires					High impedance
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 Dry Contact 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 55°C (0°F to 130°F) using alkaline
					-40°C to 85°C (-40°F to 185°F) using lithium
Optimal battery temperature range (AA)					+10°C to +50°C (+50°F to +122°F)
Lead wire length					1 ft (12 in)
Detection wires					High impedance
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 Dry Contact 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 +85°C (-40°F to +185°F) **
Included battery	Max temperature range	-40° to +85°C (-40° to +185°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 ***
Lead wire length		1 ft (12 in)
Detection wires		High impedance
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 Applications

Barn door monitoring
Freezer/cooler door monitoring
Forklift seat switches
Button or switch integration
Production line tracking

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