Data Acquisition & Logging

Wireless Duct Temperature Sensors

ALTA Wireless Duct Temperature Sensor uses an NTC thermistor with 8 ft lead wires to accurately measure temperatures

Description Features Configuration Application

The ALTA Wireless Duct Temperature Sensor uses an NTC thermistor with 8 ft lead wires to accurately measure temperatures in duct work, while maintaining a sealed environment. Can be easily installed and mounted for long-term use.

• Accurate to ± 1° C (± 1.8°F)

• Increased accuracy by user calibration to ± 0.25° C (± 0.45° F)

• Probe temperature range of -40°C to +150°C (-40°F to +302°F)

• 8 ft UL listed plenum cable

Principle of Operation

The ALTA Wireless Duct Temperature Sensor outputs the ambient temperature in degrees Fahrenheit. It is programmed to sleep for a user-given time interval (heartbeat) and then wakeup, send power to the temperature probe, wait for temperature to stabilize, then transmit the temperature data to the gateway. To stay within the abilities of the processor, the temperature is computed off a data table provided by the manufacturer. Industry leading 25 month NIST certified product included on leaded temperature sensors.

• 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 Duct Temperature 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)
Thermistor temperature range (leaded thermistor)	-40°C to +150°C (-40°F	to +302°F)
Accuracy @ 25°C	+/- 1° C (±1.8°F @ 77°F)
User-calibrated accuracy	+/- 0.25° C (±0.45°F @ 77°F)
Time constant @ 25°C	30 sec.
Lead wire length	8 ft (96 in)
Cable rating	UL listed plenum cable
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 Duct Temperature 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)
Thermistor temperature range (leaded thermistor)	-40°C to +150°C (-40°F	to +302°F)
Accuracy @ 25°C	+/- 1° C (±1.8°F @ 77°F)
User-calibrated accuracy	+/- 0.25° C (±0.45°F @ 77°F)
Time constant @ 25°C	30 sec.
Lead wire length	8 ft (96 in)
Cable rating	UL listed plenum cable
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 Duct Temperature 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	250 LUX **

Thermistor temperature range (leaded thermistor)		-40°C to +150°C (-40°F to +302°F)
Accuracy @ 25°C		+/- 1° C (±1.8°F @ 77°F)
User-calibrated accuracy		+/- 0.25° C (±0.45°F @ 77°F)
Time constant @ 25°C		30 sec.
Lead wire length		8 ft (96 in)
Cable rating		UL listed plenum cable
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

• Air duct temperature monitoring

• HVAC operation & testing

• Data center monitoring

• Coolers & freezers

• Environmental monitoring

• Smart machines & smart structures

• Many additional applications

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