Compact Air Quality and odour Monitoring Station

Scentinal provides ambient odour emission monitoring based on high accuracy (ppb level) detection of odorous gases such as H2S, Ammonia, VOCs, and SO2. The flexible intelligent station allows live monitoring of plant emissions on Scentroid’s cloud servers. Odour emission is reported in OU/m3 based on correlation determined based on periodic measurements using field olfactometry.

SL50 Scentinal Compact Air Quality and odour Monitoring Station
Scentinal provides ambient odour emission monitoring based on high accuracy (ppb level) detection of odorous gases such as H2S, Ammonia, VOCs, and SO2. The flexible intelligent station allows live monitoring of plant emissions on Scentroid’s cloud servers. Odour emission is reported in OU/m3 based on correlation determined based on periodic measurements using field olfactometry.

Flexible Sensing and Modular Design
The Scentinal product is equipped with an H2S sensor, Photo Ionization Detector (PID), and an Ethyl sensor, however, additional sensing can be added at any time. Ammonia, SO2, NOx, VOC, TRS, PM2.5, PM10, and other chemical compounds can be monitored by adding additional optional modules. The system will allow up to 20 sensors to be optionally incorporated into one Scentinal Package. See the “Available sensors“ on this page for a list of close to 30 sensors that can be selected.

Self-Configuration for Plug and Play Installation
Each sensor node has a micro controller capable of recording the sensors exact GPS position. This position is sent to the central controller with each data transfer. At the time of the installation the technician simply needs to place the Scentinal unit and power it on. The central computer will automatically recognize the Scentinal unit and know of its exact location. To reconfigure the network the physical sensor can be moved and the system will learn and adapt to this change. Multiple Scentinal units can be configured within one monitoring area.

Time Synchronized Readings
When ambient H2S data or other chemical elements data is collected it is crucial to know exactly when the data was obtained. The entire sensor network must have a synchronized clock. The GPS chip is also used to sync the sensor`s clock to the GPS clock ensuring all recorded data has a perfectly synchronized time stamp. The Scentinal smart sensors are capable of storing data locally for up to 1 year. This data can be polled by the central station as required and if the system communication is lost then the system can recover without any data lost.

Scentinal Applications
Compact Air Quality and odour Monitoring Station

Monitor numerous air contaminants simultaneously
Monitor more than 60 Volatile Organic Compounds
Monitor Particulates PM1, 2.5, and PM10
Monitor total Odour levels
Create alarms and notifications
Monitor efficiency and functionality of odour mitigation equipment
Monitor process emissions
Scentinal Basics of Operation
Compact Air Quality and odour Monitoring Station

Mount Scentinal to a pole, wall, or other structure Plug into AC power or install the Solar panels That’s It!

Just logon to the web based remote monitoring software and view readings, get report and configure the unit. There is nothing else to do, Scentinal will automatically:

Communicate with central server using its pre-loaded SIM card.
Monitors its own position and inform the server of any changes.
Automatically control the enclosure temperature using its powerful air conditioning and heating system
Conduct routine maintenance such as ozone based cleaning and sensor validation
Scentinal Capabilities
Compact Air Quality and odour Monitoring Station

Remote Monitoring based on Photo-Ionization Detectors, Nondispersive infrared sensors, and electrochemical sensors.
Measure common and exotic air contaminants to ppb level
Cloud based monitoring server for data collection, reporting, notification, alarms and more
Remotely configurable through cloud based monitoring server
Automatic cleaning using built-in ozone generator
Automatic server validation using built-in zero-air and optional calibration air
Manufacture SCENTROID
Model Scentinal SL50 Compact Air Quality & Odour Monitoring Station
Detected gases (with use of optional sensors) H2S, NH2, SO2, CO2, CO, CL, C2HO4, H, HCl, HCN, NH3, O3, NO2, PH3, H2S,
O2, SO2, CH4, NO, VOCs and more.
Included H2S sensor Specify sensor ID as H2 or H3 shown in table below
Initiation time 2 min
Additional parameters measured Temperature, Relative Humidity, GPS position
Operating temperature range with optional HVAC -50 to +50°C
Storage temperature range -50 to 80°C
Communication protocol GPRS, WIFI
Available Sensors
Scentinal Compact Air Quality and odour Monitoring Station

Sensor ID
Maximum Detection Limit
Lowest Detection Threshold
Resolution (ppm)
CD1 CO2 Carbon Dioxide – High Concentration 5%, 20% and 100% 20 ppm 100, 2000, 10000 ppm
CD2 CO2 Carbon Dioxide – Low Concentration 2000 ppm 0 ppm 0.6 ppm
CM1 CO Carbon Monoxide (low Concentration) 2000 ppm 15 ppm 5 ppm
CM2 CO Carbon Monoxide (high concentration) 10000 ppm 250 ppm 20 ppm
CL1 Cl2 Chlorine 20 ppm 200 ppb 20 ppb
E1 C2H4O Ethylene Oxide 100 ppm 1 ppm 0.1 ppm
H1 H2 Hydrogen 5000 ppm 1 ppm 0.8 ppm
HCL1 HCl Hydrogen Chloride 20 ppm 0.1 ppm 0.1 ppm
HCY1 HCN Hydrogen Cyanide 100 ppm 0.1 ppm 0.1 ppm
ON1 O3 & NO2 Oxidizing Gases Ozone and Nitrogen Dioxide O3- 20; NO2- 20 ppm 20 ppb 15 ppb
PH1 PH3 Phosphine (low Concentration) 10 ppm 50 ppb 30 ppb
PH2 PH3 Phosphine (high Concentration) 2000 ppm 5 ppm 2 ppm
HS1 H2S Hydrogen Sulfide (low Concentration – ppb) 3 ppm 3 ppb 1 ppb
HS2 H2S Hydrogen Sulfide (high Concentration – ppm) 2000 ppm 15 ppm 1 ppm
HS3 H2S Hydrogen Sulfide (medium Concentration – ppm) 200 ppm 2 ppm 0.5 ppm
E2 C2H6O, H2,
C4H10 Organic solvents (Ethanol, Iso-Butane, H2) 500 ppm 0 ppm 1 ppm
MT1 CH4 Methane (LEL) 100 % LEL (50,000 ppm) 500 ppm 200 ppm
NC1 NO Nitric Oxide (low Concentration) 20 ppm 15 ppb 5 ppb
NC2 NO Nitric Oxide (High Concentration) 5000 ppm 2 ppm 1 ppm
ND1 NO2 Nitrogen Dioxide (Low Concentration) 20 ppm 0.03 ppm 0.02 ppm
ND2 NO2 Nitrogen Dioxide (high Concentration) 200 ppm 0.3 ppm 0.1 ppm
NS1 N2O Nitrous Oxide 2000 ppm 1 ppm 1 ppm
O1 O Oxygen (Low Concentration) 20% 0.01% 0.01%
O2 O Oxygen (high Concentration) 100% 0.20% 0.10%
PD1 VOCs Total VOCs (ppb) – PID 50 ppm ( isobutylene ) 0 ppm 1 (ppb isobutylene)
PD2 VOCs Total VOCs (ppm) – PID 300 ppm ( isobutylene ) 1 ppm 0.1 (ppm isobutylene)
SD1 SO2 Sulfur Dioxide (high Concentration) 2000 ppm 10 ppm 0.5 ppm
SD2 SO2 Sulfur Dioxide (low Concentration) 20 ppm 10 ppb 5 ppb
SD3 SO2 Sulfur Dioxide (medium Concentration) 100 ppm 1ppm 0.1ppm
FM1 CH2O Formaldehyde 5 ppm 0.01 ppm 0.01 ppm
PM 1-10 PM Particulate PM 1, 2.5, 10 (simultanous) 2000 µg/m3 1 µg/m3 1 µg/m3
TS1 TSP TSP – PM Required 2000 µg/m3 1 µg/m3 1 µg/m3
NMH NMHC Non-methane Hydrocarbon 25 ppm 0.1 ppm 0.1 ppm
MS1 VOCs General Purpose Odours (VOCs) 1000 ppm isobutanol 0.5 0.5
MS2 TRS TRS and Amines 3 ppm (Methyl Mercaptan) 10 ppb 10 ppb
MS3 NH3-C2H6O- C7H8 Air Contaminants (Ammonia, Ethanol, Toulene) 3 ppm (ammonia) 10 ppb 10 ppb
MS4 NH3 Ammonia 300 10 0.5 ppm
Correlation of Scentroid Chemical Element Measurements to Odour Units
Data from the Scentinal Compact Air Quality and odour Monitoring Station system is processed by Scentroid’s chemical and olfactometric correlation system to determine odour impact in terms of odour units at the sensitive receptors. The Compact Air Quality and odour Monitoring Station uses a neural network learning algorithm to determine odour concentration from chemical readings.

Olfactometric measurements, using the Scentroid SM100 Field Olfactometer, are collected periodically (monthly, bi-monthly, or semi-annually) and are inputted into the learning algorithm along with recorded chemical composition. This sophisticated algorithm will then create a non-linear relationship between chemical readings and odour concentration. This data is used to teach the network and enhance the accuracy of odour concentration prediction from chemical composition. The advantage of this Compact Air Quality and odour Monitoring Station over other competing technologies such as E-Noses is that chemical to odour concentration is based on routinely gathered olfactometric data and therefore is always up to date regardless of changes to the plant processes.

USEPA and EU Air Quality Standards
Compact Air Quality and odour Monitoring Station

Scentinal Compact Air Quality and odour Monitoring Station ensures air quality data is reliable and robust and traceable back to recognized international standards e.g. USEPA (40 CFR Part 53) and EU (2008/50/EC).

NEMA4x Cabinet with Optional Air Conditioning and Heating
Compact Air Quality and odour Monitoring Station

Each Compact Air Quality and odour Monitoring Station is enclosed in a NEMA4x cabinet. This standard package allows the station to operate within an ambient air environment of between 4 and 35 degrees Celsius. Optionally each Station can be equipped with the following cooling and heating systems to keep the unit at optimal temperature and humidity:

• Air Conditioning System for temperatures between 35 and 50 degrees C
• Heating System for temperatures between +4 and -50 degrees C
• Combined Air Conditioning and Heating System

The HVAC system has an automated thermostat and smart power management system. The sensor network reports on the temperature and humidity of the cabinet to warn of any HVAC failures. Furthermore, each station has a hardware shut off feature to prevent over temperature failure if the temperature inside the cabinet exceeds 50 degrees C or goes below -50 degrees C due to HVAC failure.

Scentinal SL50 Can Equipped with Multiple Sampling Port
Compact Air Quality and odour Monitoring Station

Scentinal Compact Air Quality and odour Monitoring Station can be equipped with up to 3 sample ports to allow the unit to measure pollutants from different process points or locations. For example Scentinal Compact Air Quality and odour Monitoring Station can be setup to record input and output of a biotrickling filter to provide live efficiency calculations. The ¼” sample ports can be outfitted with ambient sampling hoods or be directly connected to a PTFE line.

Automatic Cleaning and Decontamination of All Lines
Scentinal Compact Air Quality and odour Monitoring Station

It has been reported that low level detection of pollutants in conventional e-noses and other monitoring stations in humid environments are prone to false positives due to contamination of the sampling lines including mold within the PTFE tubes and pumps. The Scentinal Compact Air Quality and odour Monitoring Station product has overcome this issue by installing a compact ozone generator in each monitoring station which is automatically activated once per day to clean and decontaminate all lines.

Local Data Storage and Smart Data Transfer
The Scentinal has a built in SD card that is used to store the collected data locally. While the system frequently sends the data to the central server, keeping a local copy ensures zero data loss even if there are communication issues. The rate of data transfer can also be configured through the central server to minimize GPRS traffic and to save on power.

Scentinal Includes:
Smart board for data processing and storage
GPRS pre-paid sim card
Monitoring software
Temperature and humidity sensors
Min of 3 to maximum of 20 Sensors
NEMA 4x Cabinet
Ozone generator which decontaminates all lines automatically once per day
Scentinal Heated Gas Sampling Line
heated lineScentinal Heated sampling line used to minimize condensation and increase sample integrity and meet all EPA guidelines for emissions sampling. This additional feature can be add to your Scentinal per your request. The temperature of the air entering through the sample line is monitored using a thermocouple built into the sample line and can be accurately controlled through the temperature controller inside the cabinet.

The heated sampling line consists of:

3/8” PTFE Tubing core
Aluminum heat transfer casing
Electrical heating wrap
High Temperature Thermal shielding
Aluminum heat shield
Foam insulation
Protective casing
K type Thermo Couple
Electrical connector (compatible with SL50 – Heated Sample Line controller option must be added)
Scentinal Heated Particulate Sample Inlet
heated lineA heated sample inlet for the PM1-10 sensor greatly increases the accuracy of the PM reading by eliminating water droplets and moisture from the sample. This additional feature is available for any Scentinal which has PM sensor. Temperature of the inlet can be user set to match environmental conditions using the temperature controller inside the cabinet. The actual achieved temperature is monitored using a thermocouple built into the stainless steel inner tube. The

Heated Particulate Sample Inlet module consists of:

Stainless steel Inner tube
Electrical heater
Stainless steel outer tube
Stainless steel rain cap
Thermo Couple
Temperature controller (inside cabinet)
Cloud Based Hosting
The central monitoring station is hosted on a secure cloud based server allowing remote access via any internet based computer. The access is restricted and the data is encrypted for maximum security. Users are given a password and user name which will define their permission level. Operator access can simply view the results and create reports while administrator access can reconfigure the system and set all parameters.

* The monitoring station is designed to collect all data from the sensors and present the sensor data in an easy to understand graphical interface.

Graphic Emission Representation and Reporting
ims softwareThe monitoring system continuously provides real-time readings of all sensors in the grid plus has the capability to show data for any defined instance in time. Furthermore reports such as specified period mean, high, low and variance for each sensor can be shown. Other reporting options such as sensor ranking in highest average reading and highest variation can also be requested.

Integration with Optional Total Odour Management System (TOMS)
tomsThe second stage of implementing a Scentinal sensing system is to input the data into Scentroid’s optional cloud based software TOMS. TOMS offers a complete, integrated suite for odour management. The system provides a perfect integration of real-time odour impact estimation with management of odour complaints from neighbouring residents. The simple to use software uses Scentinal sensory data, in field-olfactometry and live weather data to produce real time odour plumes showing you exactly the location and level of odour emissions. Neighbouring complaints are automatically logged and compared to odour emissions for fast and efficient validation.

How many sensors can the Scentinal accommodate?
The Scentinal can accommodate up to 10 sensors by default and up to 20 sensors if requested.

Why does the Scentinal have a built-in ozone generator?
Mold and pollutants can built up on internal surfaces of other air quality monitoring station giving false readings especially at the ppb levels. Scentinal however automatically purges the entire system including the inlet filter and the sensor bays using pulses of ozone to decontaminate to unit. The intelligent Scentinal program will also record pre and post ozone sensor readings based on clean air to verify if decontamination was successful.

How many Scentinals can connect to the server?
There is no limit. You will be provided with a login that will allow you to see all your Scentinal instruments simultaneously.

How often do I need to replace the sensors?
This depends on the type of sensors but ranges from 1 to 3 years. Sensors are inexpensive and the change is extremely easy taking no more than 15 min.




C2H4O – Acetaldehyde, C4H10 – Isobutane, C7H8 – Toluene, CH2O – Formaldehyde, Cl2 – Chlorine gas, CO – Carbon Monoxide, CO2 – Carbon Dioxide, H2S – Hydrogen sulfide, HCl – Hydrogen chloride, HCN – Hydrogen Cyanide, N2O – Nitrous oxide, NMHC – Non Methane HydroCarbon, NO – Nitric oxide, O3 – Ozone, Oxygen, PH3 – Phosphine, PM – Particulate Matter, PM1, PM10, PM2.5, SO2 – Sulfur dioxide, TRS – Total Reduced Sulphur, TSP – Total Suspended Particles


Automotive, Bio Energy, Chemical, Environmental & water treatment, Fermentations, Food & Beverages, Petrochemical, Pharmaceutical & Bio Pharma, Polymers, Power Plants, Semi-Conductor, Steel Plants, Sterilization