Data Acquisition & Logging

Wireless Low Temperature Sensors

Description Features Configuration Application

The ALTA Wireless Low Temperature Sensor uses a glass coated platinum RTD sensor to accurately measure temperatures from -200°C to +162°C (-328°F to +325°F).

• Standard accuracy at 0°C: +/- 3.3°C

• Calibrated accuracy at 0°C: +/- 0.5°C

• Temperature range: -200°C to +162°C (-328°F to +325°F)

Principle of Operation

The ALTA Wireless Low Temperature Sensor outputs the ambient temperature in degrees Celsius or Fahrenheit. It is programmed to sleep for a user-given time interval (heartbeat) and then wakeup, power up the RTD sensor and wait for it to stabilize then mathematically compute the temperature and transmit the data to the gateway. 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 AA Wireless Low 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)
RTD temperature range (RTD and cable only)					-200°C to +162°C (-328°F to +325°F)
Accuracy @ 0°C					+/- 3.3°C Standard (+/- 0.5°C Calibrated) **
Dissipation constant					2mW/°C
Thermal time constant					15 sec max
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 Low 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	5% ****
	Luminous sustainability	Minimum of 10,000 LUX ****
RTD temperature range (RTD and cable only)		-200°C to +162°C (-328°F to +325°F)
Accuracy @ 0°C		+/- 3.3°C Standard (+/- 0.5°C Calibrated) ***
Dissipation constant		2mW/°C
Thermal time constant		15-sec max
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

• Freezers & coolers

• Environmental monitoring

• Smart machines & smart structures

• HVAC operation & testing

• Many additional applications

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