Temperature
Standard Temperature General Description
ALTA® Wireless Temperature Sensors use a thermistor encapsulated in a waterproof probe to accurately measure temperature and comes in various leaded and non-leaded options.
Key Features
Measurement Range:
- Leaded: -40°C to 125°C (-40°F to 257°F)
- Non-leaded: Limited to the operational range of thesensor body (enclosure and battery)
Resolution: 0.1°C (0.18°F)
Accuracy: ± 1°C (± 1.8°F)
Calibrated Accuracy: ± 0.25°C (± 0.45°F)
Configurable thresholds for critical condition monitoring
Principles of Operation
The ALTA Wireless Temperature Sensor measures the ambient temperature based on a user-configurable time interval or Heartbeat. When performing a measurement, the sensor momentarily energizes a thermistor in series with a precision resistor. This produces a voltage directly proportional to the temperature of the thermistor. The sensor converts the analog voltage signal to a digital value and computes the temperature measurement. This measurement is then sent to the gateway, making the data available in iMonnit or another approved data service.
The ALTA Temperature Sensor can be user-calibrated for improved accuracy. Additionally, an industry-leading 25-month ISO-17025 (NIST) certification is also available.
Digital Temperature General Description
ALTA® Wireless Temperature Sensors use a thermistor encapsulated in a waterproof probe to accurately measure temperature and comes in various leaded and non-leaded options.
Key Features
Measurement Range:
- Leaded: -40°C to 125°C (-40°F to 257°F)
- Non-leaded: Limited to the operational range of the sensor body (enclosure and battery)
Resolution: 0.1°C (0.18°F)
Accuracy: ± 1°C (± 1.8°F)
Calibrated Accuracy: ± 0.25°C (± 0.45°F)
Configurable thresholds for critical condition monitoring
Principles of Operation
The ALTA Wireless Temperature Sensor measures the ambient temperature based on a user-configurable time interval or Heartbeat. When performing a measurement, the sensor momentarily energizes a thermistor in series with a precision resistor. This produces a voltage directly proportional to the temperature of the thermistor. The sensor converts the analog voltage signal to a digital value and computes the temperature measurement. This measurement is then sent to the gateway, making the data available in iMonnit or another approved data service.
The ALTA Temperature Sensor can be user-calibrated for improved accuracy. Additionally, an industry-leading 25-month ISO-17025 (NIST) certification is also available.
Duct Temperature General Description
The ALTA Wireless Duct Temperature Sensor uses an NTC thermistor with 2.67 meter (8') lead wires to accurately measure temperatures in duct work, while maintaining a sealed environment. It can be easily installed and mounted for long-term use.
Key Features
- Measurement Range: -40°C to 150°C (-40°F to 302°F)
Resolution: 0.1°C (0.18°F)
Standard Accuracy (at 25°C): ± 1°C (± 1.8°F)
Calibrated Accuracy (at 25°C): ± 0.25°C (± 0.45°F)
Accuracy over temperature range: see table below
Configurable thresholds for critical condition monitoring
Principles of Operation
The ALTA Wireless Duct Temperature Sensor measures duct temperature based on a user-configurable time interval or Heartbeat. When performing a measurement, the sensor momentarily energizes a thermistor in series with a precision resistor. This produces a voltage directly proportional to the temperature of the thermistor. The sensor converts the analog voltage signal to a digital value and computes the temperature measurement. On every Heartbeat, the sensor reports its current measurement to the gateway, making the data available in iMonnit or other approved data services.
The ALTA Wireless Duct Temperature Sensor also can be calibrated for improved accuracy.
Low Temperature General Description
The ALTA Wireless Low Temperature Sensor uses a glass-coated platinum resistance temperature detector (RTD) encapsulated in a waterproof probe to accurately measure temperature. This sensor comes standard with a one-meter (3-foot) lead, operates at extremely low temperatures, and withstands external condensation.
Key Features
Measurement Range: -200°C to 0°C (-328°F to 32°F)
Resolution: 0.1°C (0.18°F)
Standard Accuracy (at 0°C): ± 3.3°C (± 5.9°F)
Calibrated Accuracy (at 0°C): ± 0.5°C (± 0.9°F)
Accuracy over temperature range: see table below
Configurable thresholds for critical condition monitoring
Principles of Operation
The ALTA Wireless Low Temperature Sensor measures the ambient temperature based on a user-configurable time interval or Heartbeat. When performing a measurement, the sensor momentarily energizes a platinum RTD in series with a precision resistor. This produces a voltage directly proportional to the temperature of the RTD. The sensor converts the analog voltage signal to a digital value and computes the temperature measurement. On every Heartbeat, the sensor reports its current measurement to the gateway, making the data available in iMonnit or other approved data services.
The ALTA Wireless Low Temperature Sensor can also be calibrated for improved accuracy. An industry-leading 13-month ISO-17025 (NIST) certification is available for these sensors.
High Temperature General Description
The ALTA® Wireless High Temperature Sensor uses a glass-coated platinum resistance temperature detector (RTD) to measure temperature accurately. This sensor comes in various lead lengths and operates in high-temperature, dry, and low-humidity environments.
Key Features
Measurement Range: -50°C to 370°C (-58°F to +700°F)
Resolution: 0.1°C (0.18°F)
Standard Accuracy (at 0°C): ± 3.3°C (± 5.9°F)
Calibrated Accuracy (at 0°C): ± 0.5°C (± 0.9°F)
Accuracy over temperature range: see table below
Configurable thresholds for critical condition monitoring
Principles of Operation
The ALTA Wireless High Temperature Sensor measures the ambient temperature based on a user-configurable time interval or Heartbeat. When performing a measurement, the sensor momentarily energizes a platinum Resistance Temperature Detector or RTD in series with a precision resistor. This produces a voltage directly proportional to the temperature of the RTD. The sensor converts the analog voltage signal to a digital value and computes the temperature measurement. On every Heartbeat, the sensor reports its current measurement to the gateway, making the data available in iMonnit or other approved data services.
The ALTA High Temperature Sensor also can be calibrated for improved accuracy.
Thermocouple General Description
The ALTA® Wireless Thermocouple Sensor produces a temperature measurement using a K-Type (nickel-chromium / nickel-aluminum) thermocouple. This sensor is available in various commercial and industrial packages with three options: Fixed probe, Quick Connect with a probe, and Quick Connect only.
Key Features
Measurement Range:
General K-Type thermocouples: -200°C to 250°C (-328°F to 2282°F)
Fixed Probe: -100°C to 400°C (-148°F to 752°F)
Quick Connect Probe: -100°C to 260°C (-148°F to 500°F)
Typically Accuracy: ± 2.2°C (± .2.8°F)
Resolution: 0.1°C (0.18°F)
Configurable thresholds for critical condition monitoring
Principles of Operation
The ALTA Wireless Thermocouple Sensor measures the ambient temperature based on a user-configurable time interval or Heartbeat. When performing a measurement, the sensor momentarily energizes a high-performance analog-to-digital converter (ADC) to measure the thermal voltage from the thermocouple and the cold-junction temperature voltage. These digitized voltages are then used to compute the temperature value of the K-Type thermocouple. On every Heartbeat, the sensor reports its current measurement to the gateway, making the data available in iMonnit or other approved data services.
Features of Monnit ALTA Sensors
Wireless range of 2,000+ feet through 18+ walls1
Frequency-Hopping Spread Spectrum (FHSS)
Best-in-class interference immunity
Best-in-class power management for longer battery life2
Encrypt-RF® Security (Diffie-Hellman Key Exchange + Advanced Encryption Standard (AES)-128 Cipher Block Chaining (CBC) for sensor data messages)
Sensor logs 2000 to 4000 readings if the gateway connection is lost (non-volatile flash, persists through power cycling):
10-minute Heartbeats = ~ 22 days
2-hour Heartbeats = ~ 266 days
Automatic over-the-air updates to sensor firmware (future-proof)
Free iMonnit Basic Online Wireless Sensor Monitoring and Notification System to configure sensors, view data, and send alerts via SMS text, email, and voice call
1 Actual range may vary depending on the environment and gateway.
2 Battery life is determined by the sensor reporting frequency and other variables. Other power options are also available
>>Datasheet (Standard Temperature)
>>Datasheet (Digital Temperature)
>>Datasheet (Duct Temperature)
>>Datasheet (Low Temperature)
>>Datasheet (High Temperature)
>>Datasheet (Thermocouple)
