The Sentinel station measures particulate matter (PM1, PM2.5, PM4, PM10, TSP) and up to seven gases — all integrated into a single climate-controlled stainless steel enclosure, built for harsh Australian conditions.
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Overview
The Sentinel station is designed to deliver precise and real-time monitoring of air pollutants. Equipped with state-of-the-art sensors, it measures particulate matter and gases such as O3, CH4, NH3 and VOCs, helping you demonstrate compliance with health, safety and environmental regulations.
Measurements
A 660 nm laser Optical Particle Counter classifies particles across 24 size channels, while electrochemical, NDIR and PID sensing covers the gas suite. Configure each station with up to seven gases to match your site's monitoring objectives.
Optical Particle Counter · 0.35–40 µm · 0–2 mg/m³ · 24 size channels
All fractions measured simultaneously in real time
Electrochemical / NDIR / PID sensing · typical sensor lifetime 24 months
Included as standard Optional selection
The Sentinel station is ready to integrate the full suite of meteorological parameters from the Observator Instruments portfolio, giving you pollution and weather data from a single platform.
Applications
Four application-specific configurations share the same proven platform, each tuned to the pollutants, integrations and duty cycle of its environment.
Urban air quality networks, Smart City and ITS projects, industrial zones, and scientific or educational programs — with remote access over wired or wireless networks.
Measures PM fractions plus NOx, O3, CO2 and VOCs around terminals and aprons. Ships with a noise sensor as standard and integrates with existing airport systems.
Tracks traffic-related pollutants (NOx, O3, NH3, TVOC) and comes standard with side-fire dual-beam radar for vehicle tracking and classification, plus a noise sensor.
Marine-grade 316L enclosure option for ports and coastal sites. Monitors particulates, SO2, NOx and VOCs to support compliance in harsh marine conditions.
In the field
Specifications
| Principle | Optical Particle Counter (OPC), 660 nm laser |
|---|---|
| Classification | PM1, PM2.5, PM4, PM10, TSP |
| Measurement range (size) | 0.35–40 µm |
| Measurement range (mass) | 0–2 mg/m³ |
| Size channels | 24 |
| Resolution / accuracy | 1 µg/m³ / 5 µg/m³ |
| Sample inlet | Omni-directional heated inlet |
| Principle | Electrochemical / NDIR / PID |
|---|---|
| Standard gases | O3, CH4, NH3, TVOC |
| Optional gases | NO, NO2, NOx, CO, H2S, HCl, CO2, SO2 |
| Maximum per station | 7 gases |
| Typical sensor lifetime | 24 months |
| Air sampling | Pump with controlled air flow, climate-controlled chamber |
| Interfaces | Wi-Fi, Ethernet LAN, GSM 3G / 4G LTE, LoRaWAN, GPS, USB, SD card, Bluetooth, RS232, RS485 |
|---|---|
| Control outputs | 6 programmable output channels |
| Data storage | Internal memory, SD card, USB |
| Operating system | Linux (OpenWRT) |
| Power supply | 110 / 220 VAC (12 VDC option) |
|---|---|
| Power consumption | Max 200 W (with heated inlet), surge protected |
| Enclosure | Stainless Steel 304 or marine-grade 316L |
| Operating temperature | -35 °C to +60 °C |
| Humidity | <99% RH (non-condensing) |
| Protection | IP65 · CE Declaration |
| Certification | MCERTS certification pending |
| Dimensions / weight | 600 × 600 × 300 mm (without collectors) · 40 kg |
Optional equipment: Class 1 Urban Noise Monitoring Terminal (IEC 61672), side-fire dual-beam ITS radar sensor, and full meteorological integration (wind speed and direction, temperature, humidity, barometric pressure, precipitation and more) from the Observator Instruments portfolio. Specifications may be subject to change without prior notice. MCERTS certification is pending.
Software & data
Detailed data analysis and station management from a desktop application, with automatic logging across internal memory, SD card and USB.
Android and Apple apps provide on-the-go access to real-time readings and notifications from every station in your network.
Optional cloud hosting lets you monitor and manage air quality data securely from any browser, anywhere with an internet connection.
Talk to Observator's Australian team about configuring a Sentinel station for your site, from a single roadside unit to a city-wide network.
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The Sentinel station is supplied and supported in Australia by Observator Instruments Pty Ltd, backed by Observator's worldwide network with offices in Australia, Germany, the Netherlands, Poland, Singapore and the United Kingdom.