Principle of Operation

Monnit Differential Pressure Sensor measures the pressure difference between two ports. When viewing the sensor from the top, the right inlet port is the positive or high side pressure input. When the pressure on this port is greater than the left port the sensor produces a positive pressure reading. When the pressure is greater on the left port the sensor produces a negative pressure reading.



Example Interfacing

  • Building/Room Pressure
  • Air Flow
  • Variable Air Volume Filter Status
  • Duct Pressure
  • Clean Rooms
  • Hospitals
  • Fume Hoods
  • Computer Rooms



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 **
  • Encrypt-RF ® Security (Diffie-Hellman Key Exchange + AES-128 CBC for sensor data messages)
  • Datalogs 2000 to 4000 readings if gateway connection is lost (non-volatile flash, persists through the power cycle):
  • 10-minute heartbeats = ~ 22 days - 2-hour heartbeats = ~ 266 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 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.







ALTA Commercial AA Wireless Differential Pressure Sensor

Technical Specifications

ALTA Commercial AA Different Pressure Thermocouple Sensor

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 **
Lead Tubing Length 3 ft. (91.5 cm.) DW-0026-02 Tubing
Pressure Range -500 Pa to 500 Pa
Allowable overpressure 100 kPa
Accuracy                 3% of reading ± 0.1 Pa
Temperature Measurement Range -40°C to 85°C (-40°F to +185°F)
Temperature Accuracy ± 2°C (-10°C to +60°C)
± 3°C (-40°C to +85°C) 
Datalogging 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 
Certifications 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.

** At temperatures above 100°C, it is possible for the board circuitry to lose programmed memory. 





ALTA Industrial Wireless Different Pressure Sensor

Technical Specifications

ALTA Commercial AA Wireless Differential Pressure Sensor

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) **
Pressure Range -500 to 500 Pa
Lead Tubing Length 3 ft. (91.5 cm.) DW-0026-02 Tubing
Allowable Overpressure                100 kPa
Accuracy 3% of reading ± 0.1 Pa
Temperature Measurement Range -40°C to 85°C (-40°F to +185°F) 
Temperature Accuracy ± 2°C (-10°C to +60°C)
± 3°C (-40°C to +85°C) 
Datalogging 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 
Certifications 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.

** At temperatures above 100°C, it is possible for the board circuitry to lose programmed memory

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