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  • PAA rental now available

    The C16 Portasens II is gas detection monitor that we currently off as a rental.  We just recently added to the gas sensor options, the PAA (Peracetic Acid Vapor) 0-2 ppm sensor.  Our rental C16 monitor and the PAA sensor can be leased on a weekly or monthly basis.  If you start with the weekly rate and decide you need the unit for long, we can easily upgrade you to the monthly fee and extend your rental period.

    Renting a C16 and Peracetic Acid (PAA) sensor is a great way to determine what your current PAA levels are and what action steps should be taken for safety and gas leak detection.

    C16 PoratSens II rental C16 PortaSens II + Peracetic Acid (PAA) sensor rental

    How does our rental program work?

    • You place the order via website or phone with credit card for weekly or monthly rental
    • We ship device to your location using your preferred shipping carrier
    • Rental period of 7 or 30 days begins when device arrives to your location
    • Device is in use for either 7 or 30 days
    • Rental period ends when you ship device back using your preferred carrier
    • When we receive device we check over for proper operation, calibrate if necessary and get it ready for the next customer!

    A complete specification sheet on the PAA 0-2 ppm sensors can be found on our website.

    We also offer the C16 PortaSens II rental with other gas sensors: Ozone, Oxygen, Chlorine, Chlorine Dioxide, Hydrogen Chloride, Hydrogen Selenide, and Ammonia.

    Do you need a gas sensor rental that's not listed? Please give us a call with your specific needs and we'd be happy to try and meet that requirement.

    All of our Peracetic Acid gas information and available monitoring equipment can be found on our PAA information page.

  • Aeroqual Monitor Functions

    Aeroqual Monitor Base

    The Aeroqual monitor base is an electronic platform with an ergonomic design into which you plug your chosen sensor head(s).  The monitor base has a range of features that allow it to be used in a variety of different applications.  The Aeroqual portable air quality monitors are a cost-effective solution to measuring multiple target gases and particulate matter at different concentrations in indoor and outdoor applications.

    Which monitor do I need?

    For real-time display measurements and zero calibration, the Series-200 is a cost effective solution. If an audible alarm or analog output are required, along with the ability to make gain adjustments, choose the Series 300.  For all of these features and datalogging, the flagship Series 500 is a clear choice.  For a comparison of the different monitor bases (Series-200, Series-300, Series-500), see the chart below which can help to identify the model most suitable for your requirements.

    Compare the Aeroqual handheld devices


    Aeroqual Series-200


    Aeroqual Series-300


    Aeroqual S-500

    Interchangeable sensor head Yes Yes Yes
    Digital LCD Display Yes Yes Yes
    Min, Max, Average readings on screen Yes Yes Yes
    Field Replaceable Battery Yes Yes Yes
    Remote Sensor Capability Yes Yes Yes
    Temp and HR Sensor optional Yes Yes Yes
    External Control Outputs No Yes Yes
    Audible Alarm No Yes Yes
    High and Low Alarms No Yes Yes
    0-5 VDC Analog output No Yes Yes
    Zero Calibration capability Yes Yes Yes
    Span Calibration capability No Yes Yes
    Internal Data Logging Capability No No Yes
    PC connection cables and capability No No Yes


    Monitor Functions

    The image below show the functions for the Series 500 Monitor.

    Series-500 Functions

    • Interchangeable sensor heads
    • Field replaceable, long life -lithium battery
    • Minimum, maximum, and average readings
    • Measurement units (ppm or mg/m3)
    • Zero calibration
    • Location and Monitor ID
    • Span calibration
    • 0-5V analog output
    • External transistor outputs
    • High and low alarms
    • Data logging
    • Aeroqual integration software

    Series-300 Functions

    • Interchangeable sensor heads
    • Field replaceable, long life -lithium battery
    • Minimum, maximum, and average readings
    • Measurement units (ppm or mg/m3)
    • Zero calibration
    • Span calibration
    • 0-5V analog output
    • High and low alarms

    Series-200 Functions

    • Interchangeable sensor heads
    • Field replaceable, long life -lithium battery
    • Minimum, maximum, and average readings
    • Measurement units (ppm or mg/m3)
    • Zero calibration

    For more information on our Portable Monitors, please visit our website.

  • Peracetic acid (PAA) as a sterilizer

    Peracetic acid (PAA) has been used since the early 1950's as a disinfectant in the food industry.  Exposure level guidelines are important to follow when using any type of gas when cleaning for personnel safety.  Below is an article on the Peracetic acid exposure levels that should be followed.

    Monitoring equipment for Peracetic Acid can be found on our website.

    Peracetic Acid Occupational Exposure Levels

    Peracetic acid (PAA) is gaining wide acceptance as a disinfectant and sterilant in many industries including healthcare, food processing (aseptic packaging, bottling, dairy and meat) and water treatment. PAA acid is a relatively simple chemical formed as an equilibrium component in a mixture of hydrogen peroxide and acetic acid; with excellent disinfection properties and additionally PAA is environmentally benign since it rapidly breaks down to harmless product (acetic acid and water).

    Any broad spectrum disinfectant or sterilant is potentially hazardous to people exposed to it and the widespread use of PAA has meant that there is the potential for workplace exposure. While employers have a duty to ensure a safe workplace [OSH Act (1970) sec. 5], it has been difficult to determine what level of PAA exposure is safe since there is no OSHA permissible exposure limit for PAA and little other guidance.

    Guidance is now available: The EPA published acute exposure guidelines for PAA in 2010, available at http://www.epa.gov/oppt/aegl/pubs/results80.htm. In addition, the ACGIH has recently published a notice of intended change to introduce a short term exposure limit (STEL) of 0.2 ppm for PAA to The notice is available from the ACGIH website at http://www.acgih.org/store/ProductDetail.cfm?id=2199 and marks a significant improvement in the hazard assessment information available to employers using PAA.

    Knowing the exposure limit is only helpful if the actual exposure can be measured; and the ChemDAQ offers continuous monitors for PAA, designed to operate with sufficient resolution to provide protection at these low levels.

    You can view the full article HERE.

    Monitoring equipment for Peracetic Acid can be found on our website.

  • Easy as 1-2-3 Aeroqual Monitors

    Aeroqual portable air monitors are great for ambient air quality monitoring and can be used to detect a wide variety of gases, such as: ozone, nitrogen dioxide, sulfur dioxide, hydrogen sulfide, carbon monoxide, vocs,  and particulate matter. They are used by researchers, professionals, and non-experts alike to gather indicative air quality data. Small enough to fit comfortably in your hand, they can be used anywhere - indoors or outdoors, on the street, up a mountain, they've even been used in Antarctica! Or if you don't need to move around and be portable, the wall bracket can be used to simply mount the Monitor to the wall.

    Using the Aeroqual monitors is as easy as 1-2-3.  See the simple steps below.

    Step 1 : Gather data

    Use the monitor and inter-changeable sensor to take spot measurements. Using the Series 500 you can even log data over time and space.

    Step 2: Download data

    Connect to a PC and download your measurements using Aeroqual's free software or 0-5V analog output.

    Step 3: Analyze data

    Analyze your data to identify trends, discover leaks or pollution hot spots, or dive deep into the numbers for research.

    More information on the Aeroqual Gas Detection Monitors can be found on Gas Sensings website, using the links below.

    Series 500

    Series 300

    Series 200

    Aeroqual Sensors

  • OEM-1,2 vs the SM-50 OEM Ozone Sensors

    The OEM-1 and OEM-2 and SM-50 are all Original Equipment Manufactures (OEMs) Ozone Sensors that are designed with state of the art sensor technology that can be integrated into your own equipment.  OEM Sensors are a great addition to any Ozone System to help ensure any ozone leaks are detected and the Ozone Generation system is shut off.  The OEM sensors can be integrated into your system to control your Ozone Generation system and turn it off and one based on your preset levels. Below we will lay out the benefits and differences between the EcoSensors OEM-1&2 and the Aeroqual SM-50 OEM Ozone Sensors.







    • 3 range options: 0-0.1ppm, 0-1ppm, 0-10ppm of ozone
    • Can control Ozone Generators and alarms based on an adjustable ozone concentration set point
    • Sensor replacement (SM-1) is simply plug-n-play
    • Pre-calibrated sensors
    • OEM-2 has 4-20mA output
    • Sensors can be located up to 25ft (8meters) away from the board using an extension cable
    • Base Board incorporates power supply, final signal processing, set-point controls and output relay
    • HMOS (Heated metal oxide semiconductor) Sensor


    • The OEM-1&2 are being discontinued October 2017 with the new OEM-3 being released mid-November 2017. The replacement sensors for the OEM-1&2 (SM-1) are no longer available for the OEM-1&2, and will need to be replaced with the new OEM-3.
    • Accuracy 20%



    SM50 Sensor & Board


    • 3 range options: 0-0.15ppm, 0-0.5ppm, 0-10ppm of ozone
    • Analog voltage
    • Relay and status indicators
    • Optional RS232 or RS485
    • Factory calibrated and ready to use
    • Preloaded firmware that optimizes measurements and enhance data output
    • User set points to trigger alarm
    • GSS (Gas Sensitive Semiconductor) Sensor
    • Optional use of: 2 analog voltages inputs and 2 GPIO which can connect a temp/RH sensor
    • Accuracy +/-10%


    • Complete board needs to be replaced when sensor goes bad.

    Main differences:

    Why use OEM Sensors?

    Ozone Sensors should be used in EVERY Ozone Generator to ensure safety for anyone that might be exposed to unsafe levels of ozone.  OSHA has regulations for ozone and proper safety precautions that should be set in place, such as an ozone sensor to shut of Ozone Generator when unsafe levels are detected, is one of them.  If regulations are not followed, it could cost your company a lot of money.  See this story that talks about the fines from OSHA due to worker safety levels.

    More information on these products can be found on our website.

    OEM-1 - http://www.gas-sensing.com/oem-1.html

    OEM-2 - http://www.gas-sensing.com/oem-2.html

    SM-50 - http://www.gas-sensing.com/aeroqual-sm-50.html

  • B12 Wet Gas Transmitter

    ATIs B12 Wet Gas Transmitter is the perfect unit for wet environments (100% moisture saturated atmosphere).  The unit is a loop-powered 2-wire transmitter and has a corrosion resistant sensor perfect for direct measurement.  The B12 is especially popular in chlorine storage facilities and chemical process plants as they are required to scrub exhaust gas streams to remove halogen and acid gases.

    B12 Wet Gas Transmitter B12 Wet Gas Transmitter with 25 feet of cable for remote sensing

    For remote display and alarm functions, the B12 can be paired with the B14 Alarm Receiver System and provide direct digital display of gas concentration, plus 3 alarm set points, remote alarm reset input, and re-transmitted 4-20mA output.   The B12 can also be tied directly to your PC or other equipment to display readings. (see below for typical installation of the B12).

    Wondering how the B12 will fit into your system for detection? This diagram show the typically installation location. Wondering how the B12 will fit into your system for detection? This diagram show the typical installation location.

    There are a few custom options that can be added/done when you order the B12 such as:

    • Gas sensor type (Bromine, Chlorine, Chlorine Dioxide, Hydrogen, Hydrogen Bromide, Hydrogen Chloride, Hydrogen Fluoride, Ozone)
    • LCD display on the B12 face
    • Explosion Proof Enclosure
    • 25 feet of remote cable & sensor for remote mounting

    You can find the B12 Wet Gas Transmitter on our website, and in the ordering process you can pick which custom options will work best for your application.

  • Particulate Matter (PM) sensor

    A new PM (Particulate Matter) sensor will be released in September and is designed to simultaneously measure PM2.5 and PM10 for indoor and outdoor use. This portable particulate monitor will display real-time measurements of particulate matter. (See picture of the display below)

    Particulate Meter readout

    The PM sensor will need to be used with the portable base Series 200, Series 300, or Series 500 that gives the digital readout of the current particulate matter measurement.  Like the other Aeroqual sensors, the PM sensor head can be swapped around and the same base can be used with up to 30 different gas sensors.

    Particulate Matter Sensor

    From the manufacturer Aeroqual: "Field tests have shown the portable particulate monitor provides useful data when compared to traditional ‘reference’ methods. This data will be made available on commercial release of the product."

    GasSensing is excited to offer this new PM sensor in September as we feel it will be a great addition to the Aeroqual sensor line.  In addition to being able to purchase this sensor from GasSensing, we will be offering the PM10/PM2.5 as a rental sensor with the Series 500.

    Feel free to contact us with questions or register your interest in the PM10/PM2.5 Sensor.

  • Wireless Gas Monitoring

    Wireless gas monitoring

    Recently Gas-Sensing introduced a new accessory making it possible to connect gas monitors to the internet. We call this accessory the Wireless Monitoring and Data Logging Kit. This has sparked a lot of interest and we have had excellent feedback from our customers who have purchased and are using this kit.

    How it works

    The Wireless Monitoring and Data Logging Kit works by wiring a current or voltage sensor to the analog outputs, which correspond with the gas concentration on a fixed gas monitor. The current or voltage sensor communicates with a gateway which is connected to the internet, and finally to view and collect the data in real time, you simply open up the online portal with the credentials we provide you.

    Wireless gas monitoring How the wireless monitoring and data logging kit works

    Wireless Sensor                             Wireless Gateway                              Online Portal

    This essentially makes any fixed mount gas monitor we offer wireless and IoT enabled (Internet of Things).

    Advantages to connecting a gas monitor to the internet:

    • Knowledge of gas concentrations anytime, from anywhere by simply opening our app on a smartphone.
    • Free email and SMS text message alerts for alarming situations.
    • 24/7 data logging to view trends over a given amount of time.
    • No monthly fees.

    This accessory will be wired and mounted on your gas monitor before shipment, making this as user friendly as possible.

    Here is one of the success stories we have had since launching the Wireless Monitoring and Data Logging Kit.

    Brandon works for a University and sterilizes laboratories with high concentrations of Hydrogen Peroxide. He would typically treat 3 rooms simultaneously, and all three rooms were connected to a hallway.

    Before contacting Gas Sensing he was unsure of the Hydrogen Peroxide levels achieved  during a treatment inside of the rooms. He also had to sit in the hallway with a handheld monitor during the entire treatment  (4-5 Hours).

    So we provided a simple solution.

    Wireless gas monitoring Wireless monitoring and data logging kit for Hydrogen Peroxide

    We provided him with 3) 0-1000 PPM Hydrogen Peroxide sensors for the rooms being treated, and 1) 0-10 PPM Hydrogen Peroxide Sensor for the hallway to detect any possible leaks.

    This was using the B12 2 Wire Transmitter from ATI, with the remote monitoring and data logging accessory attached.

    This way Brandon could open up the online portal to see his hydrogen peroxide concentrations in real time, and set notifications when specific conditions are met.

    online portal Online portal to view gas concentrations remotely

    This is what Brandon had to say after using these products:

    “ This is the perfect set-up for any facility or company that has to do large scale decontamination projects. It eliminates having to run cables under doors then going back and trying to keep the VHP from leaking out. I’m really impressed because it made my life and job 100x easier. Now I don’t have to sit in the hallway for hours, I can just set the monitor outside and have it send me a notification if it senses anything above 1 PPM! “

    Click here to check out our page on the Wireless Monitoring and Data logging Kit to learn more.


    Contact us to assist you with your wireless gas monitoring application!

  • Aeroqual Replacement Parts

    We realize things get lost, misplaced, or sometimes it's just handy to have another cord. That's why we recently added many of the replacement accessories for the Aeroqual units to our website.  The new accessories that can be found on Gas-Sensings website are:

    Replacement Power Cord

    The replacement power cord for the S200, S300, S500, SM70 and Series 930 Gas Monitors. The R18 is the new power cord vs the R20 can be used with the older style units that use the NIMH batteries.


    CONPS2Y is the 2 way connection cable that can be used with the S500 Monitor when you need both the Temperature & Relative Humidity (TRH) sensor and Computer cable (R19) plugged into the unit base, this cord gives you the ability to do so.

    Aeroqual CONPS2Y

    R19 Cable

    The R19 cable is used to connect the S-500 Monitor to the USB in your computer for data transfer. This cable is 6 feet long.

    R19 Monitor to PC Cable


    The R17 is a RS485 to USB converter cable that is used with the S900, S930, S940, and SM70 for data transfer to your computer.

    R17 RS485 to USB Converter

    Display Label

    The Aeroqual label on your Series 200, 300, 500 might have pealed off over time.  The replacement display label comes as an easy to apply sticker.

    Aeroqual Display Label

    Aeroqual Display

    If the LED screen on your Aeroqual Series 200, 300, 500 goes bad you can purchase a replacement display to install in your device.

    Aerqual LED Display

    Can't find the replacement piece or accessory you are looking for?  Give us a call or e-mail us for help.

  • Renting Gas Detection Equipment

    Rental gas detection equipment is one of the services that we offer to allow our customer who are unsure of the level of toxic gas they detecting, or for short term applications.  We offer both weekly and monthly rental rates based on your required use time. Even if you start off with a weekly rental and then decide that a month would be better, it's easy to upgrade! We currently offer the C16 PortaSens II as our rental device with the option of 6 different gas sensors.

    Gas Detection Rental Equipment C16 C16 PortaSens II Rental

    Sensor Options

    Ozone 0-2 ppm
    Oxygen 0-25%
    Chlorine 0-2 ppm
    Chlorine Dioxide 0-2 ppm
    Hydrogen Chloride 0-20 ppm
    Hydrogen Selenide 0-1000 ppb

    There are many different gas sensors that can be used with the C16, so if you don't see the gas you require on the list, please give us a call to see if we can meet your needs.

    The rental process:

    • Place the order on our website or phone using a credit card
    • We ship the rental to your location using your preferred shipping carrier
    • Rental period of 7 or 30 days begins when the device arrives to your location
    • Use the device for your rental period (7 or 30 days)
    • Give us a call if you want to extend your rental time
    • Rental period ends when you ship the device back to us using your preferred shipping carrier
    • We receive the device and check for proper operation, calibrate if necessary and get it ready for the next customer

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Phone: 605-368-1404    |    E-mail: sales@gas-sensing.com    |    1322 1st street    Hull, IA 51239    |    Contact Us    |    About Us