Here you will find the Pre-Purchase Frequently Asked Questions (FAQs) for Aeroqual’s Fixed Indoor Monitors (S900/S930/SM70).

1. What are the different sensor head types for fixed monitors?

The Series 900, Series 930 and SM70 Fixed Indoor Air Quality Monitors are compatible with different types of sensor heads.

  • Series 900 fixed monitors are compatible with Type 1 sensor heads (interchangeable)
  • Series 930 fixed monitors are compatible Type 2 sensor heads (removable/ replaceable)
  • SM70 fixed monitors have user-defined sensor modules (removable / replaceable)

Ozone Sensor

Type 1 sensor head

Ozone Type 2

Type 2 sensor head

2. What are the different gas sensor heads available for the fixed monitors?

Series 900 Fixed Monitor

The Series 900 Fixed Monitor is compatible with all available gas sensor heads in our range.

To view the full list, visit the Series 900 Fixed Monitor product page, or view the Portable and Fixed Monitor Sensor Spec Sheet.

Series 930 Fixed Monitor

  • Ammonia Sensor 0-100ppm
  • Carbon Monoxide Sensor 0-25ppm
  • Carbon Monoxide Sensor 0-100ppm
  • Chlorine Sensor 0-10ppm
  • Formaldehyde Sensor 0-10ppm
  • Methane Sensor 0-10000ppm
  • Hydrogen Sulfide Sensor 0-10ppm
  • Nitrogen Dioxide Sensor 0-1ppm
  • Ozone Sensors 0-0.05ppm, 0-.15ppm, 0-0.5ppm, 0-10ppm
  • Sulfur Dioxide Sensor 0-10ppm
  • Sulfur Dioxide Sensor 0-100ppm
  • VOC Sensor 0-25ppm
  • VOC Sensor 0-20ppm
  • VOC Sensor 0-2000ppm

SM70 Fixed Monitor

Ozone sensor modules:

  • 0-0.15ppm
  • 0-0.5ppm
  • 0-10ppm

3. Can I use a Particulate Matter (PM10 / PM2.5) sensor head with a fixed monitor?

No. The PM10 / PM2.5 sensor head is only compatible with the Portable Monitors. If PM measurement is important in a fixed monitor, you may want to consider the AQY Air Quality Monitor.

Alternatively, please contact us to discuss your specific requirements further.

4. What are the different enclosure ratings of the fixed monitors?

Series 900 Fixed Monitor

The Series 900 is a base unit and does not have an enclosure.

Series 930 Fixed Monitor

The Series 930 enclosure is Polycarbonate/ IP41* NEMA 2** equivalent.

*IP 41 Rating: Protected from tools and small wires greater than 1 millimeter. Protected from condensation.

**NEMA 2: Indoor use to provide a degree of protection against a limited amount of falling water and dirt.

SM70 Fixed Monitor

The SM70 Fixed Monitor enclosure is Polycarbonate/ IP20* NEMA 1** equivalent.

*IP20 Rating: Protected from touch by fingers and objects greater than 12 millimeters.

**NEMA 1: Indoor use primarily to provide a degree of protection against contact with the enclosed equipment and against a limited amount of falling dirt.

5. How do I calibrate my Fixed Monitor sensor heads?

We recommend that sensor heads be calibrated at least once a year.

Series 900 Fixed Monitor – Type 1 Sensor Head

    1. Factory calibration. Return sensors to Aeroqual for a multi-point calibration and new calibration certificate. Please contact our technical team.
    2. Manual calibration. Gas sensors only. Please refer to our page on portable monitor calibration.

Series 930 Fixed Monitor – Type 2 Sensor Head

Factory calibration. Return sensors to Aeroqual for a multi-point calibration and new calibration certificate. Please contact our technical team.

SM70 Fixed Monitor Ozone Sensors

The sensor board must be replaced when the SM70 Fixed Monitor Ozone sensor is due for calibration. Please contact our technical team, and provide the serial number of your monitor.

6. What are the different output types?

Series 900 and Series 930 Fixed Monitor

Analogue output: 4-20mA (opto-isolated), 12-24V
Digital output:      RS232 and RS485

SM70 Fixed Monitor

Analog output:    0 – 5 VDC (8 bit)[AO1] / 0-1.5V (UZ sensor board)
Digital output:     RS232 and RS 485
Relay output:       24V; 5A(max.)

7. Can I use these the fixed monitor with my own software?

The user guide for each of the Fixed Indoor Air Monitors contains the relevant protocol commands for integrations into third party systems. User guides can be found on the Technical Documents page.

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