Wireless Temperature Sensors
General Description
The ALTA Wireless Temperature Sensor uses a type
NTC thermistor to measure temperature.
• Accurate to ± 1° C (± 1.8° F)
• Increased accuracy by user calibration
to ± 0.25° C (± 0.45° F)
Principle of Operation
The ALTA Wireless 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 NTC
Thermistor and wait for it to stabilize, and convert the
analog data, mathematically compute the temperature
and transmit the data to the gateway. To stay within the
abilities of the processor, the temperature is computed
off a data table provided by the manufacturer. To reduce
error, a variable resistor conguration is implemented
over specied temperature ranges.
Example Applications
• Ambient temperature monitoring
• Environmental monitoring
• Smart machines & smart structures
• HVAC operation & testing
• Data center monitoring
• Many additional applications
The Leading Enterprise Internet of Things Solution
PAGE 1
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Features of Monnit ALTA 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 (Dife-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 notication system to congure sensors, view
data and set alerts via SMS text and email
Wireless Range Comparison
Monnit ALTA
Monnit
Other Wireless Platforms
Wifi
Bluetooth
Wireless Range Comparison
*Actual range may vary depending on environment.
** Battery life is determined by sensor reporting
frequency and other variables. Other power options
are also available.
1.125 in
(28.575 mm)
2.0 in
(50.8 mm)
0.875 in
(22.225 mm)
Pinch and Pull
To Change Battery
CR2032 BATTERY
ALTA Commercial Coin Cell Wireless Temperature Sensor | Technical Specications
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 (thermistor only) -40°C to +125°C (-40°F to +257°F)
(Limited to main-unit circuitry, -7°C to +60°C unless wire leads
are being used.)
Accuracy @ 25°C +/- 1% (1° C or 1.8° F)
User-calibrated accuracy +/- 0.25° C (± 0.45° F)
Time constant @ 25°C 30 sec
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
Certications 900 MHz product; FCC ID: ZTL-G2SC1 and IC: 9794A-
G2SC1. 868 and 433 MHz product tested and found to
comply with: EN 300 220-2 V3.1.1 (2017-02), EN 300 220-2
V3.1.1 (2017-02) and EN 60950
*Hardware cannot withstand negative voltage. Please take care when connecting a power device.
PinchPower™ Enclosures
Pull
(sensor away from base)
Pinch
(press in on the sides)
Press
(sensor back into base)
CR2032 BATTERY
+
_
CR2032 BATTERY
PAGE 2
Industry
Canada
ALTA Commercial AA Wireless Temperature Sensor | Technical Specications
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 (thermistor only) -40°C to +125°C (-40°F to +257°F)
(Limited to main-unit circuitry, -7°C to +60°C unless thermistor
leads are being used.)
Accuracy @ 25°C +/- 1% (1° C or 1.8° F)
User-calibrated accuracy +/- 0.25° C (± 0.45° F)
Time constant @ 25°C 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
Certications 900 MHz product; FCC ID: ZTL-G2SC1 and IC: 9794A-
G2SC1. 868 and 433 MHz product tested and found to
comply with: EN 300 220-2 V3.1.1 (2017-02), EN 300 220-2
V3.1.1 (2017-02) and EN 60950
*Hardware cannot withstand negative voltage. Please take care when connecting a power device.
1.111
2.470
2.470
1.111
4.375
3.295
Power Options
The standard version of this sensor is powered by two replaceable 1.5 V AA sized batteries (included with purchase).
This sensor is also available with a line power option. The line powered version of this sensor has a barrel power
connector allowing it to be powered by a standard 3.0–3.6 V power supply. The line powered version also uses two
standard 1.5 V AA batteries as backup for uninterrupted operation in the event of line power outage.
Power options must be selected at time of purchase, as the internal hardware of the sensor must be changed to support
the selected power requirements.
PAGE 3
Industry
ALTA Industrial Wireless Temperature Sensor | Technical Specications
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 efciency Optimized for high and low-light operation **
Charging efciency 40% ***
Luminous sustainability Minimum of 250 LUX ***
Thermistor temperature range (thermistor only) -40°C to +125°C (-40°F to +257°F)
(Limited to main-unit circuitry, -40°C to +85°C)
Accuracy @ 25°C +/- 1% (1° C or 1.8° F)
User-calibrated accuracy +/- 0.25° C (± 0.45° F)
Time constant @ 25°C 30 sec
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 specications (File E194432)
Certications 900 MHz product; FCC ID: ZTL-G2SC1 and IC: 9794A-G2SC1.
868 and 433 MHz product tested and found to comply with: EN
300 220-2 V3.1.1 (2017-02), EN 300 220-2 V3.1.1 (2017-02)
and EN 60950
*Hardware cannot withstand negative voltage. Please take care when connecting a power device.
** Light present 25% of day yields 125% of operating power to support 10-minute heartbeats.
*** Solar feature’s energy harvesting circuitry works indoors with low light.
3.701 in
(94.0 mm)
Height:
1.378 in
(35.0 mm)
2.316 in
(58.84 mm)
Industrial
Wireless
Sensor
PAGE 4
Industry
ADS-A001-1D (7/18)
Monnit, iMonnit, ALTA, PinchPower, Encrypt-RF and all other trademarks are property of Monnit, Corp.
© 2018 Monnit Corp. All Rights Reserved.
Monnit Corporation
3400 South West Temple
Salt Lake City, UT 84115
801-561-5555
www.monnit.com
Commercial Grade Sensors
Monnit commercial grade sensors are designed for applications in ordinary environments (normal room temperature,
humidity and atmospheric pressure). Do not use these sensors under the following conditions as these factors can
deteriorate the product characteristics and cause failures and burnout.
• Corrosive gas or deoxidizing gas: chlorine gas, hydrogen sulde gas, ammonia gas, sulfuric acid gas, nitric oxides
gas, etc.
• Volatile or ammable gas
• Dusty conditions
• Low-pressure or high-pressure environments
• Wet or excessively humid locations
• Places with salt water, oils chemical liquids or organic solvents
• Where there are excessively strong vibrations
• Other places where similar hazardous conditions exist
Use these products within the specied temperature range. Higher temperature may cause deterioration of the
characteristics or the material quality.
Industrial Grade Sensors | Type 1, 2, 4, 4X, 12 and 13 NEMA Rated Enclosure
Monnit’s Industrial sensors are enclosed in reliable, weatherproof NEMA-rated enclosures. Our NEMA-rated enclosures
are constructed for both indoor or outdoor use and protect the sensor circuitry against the ingress of solid foreign objects
like dust as well as the damaging effects of water (rain, sleet, snow, splashing water, and hose-directed water).
• Safe from falling dirt
• Protects against wind-blown dust
• Protects against rain, sleet, snow, splashing water, and hose-directed water
• Increased level of corrosion resistance
• Will remain undamaged by ice formation on the enclosure
For more information about our products or to place an order, please contact
our sales department at 801-561-5555.
Visit us on the web at www.monnit.com.