AirQ 121-EXT temperature datalogger

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with external probe

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Monitor from the web!

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AirQ 121-EXT is a battery powered and wireless datalogger, which has all features of AirQ 121 and AirQ 101-EXT models. It allows data detection out of radio range of an AirQ control unit (ex. AirQ 200) and allows to detect temperature in a operating range larger than a base sensor (ex. AirQ 101).


1 Wireless:  no wiring, no change for existing installation. Just put it wherever you need.

2 External probe: thanks to external probe, the measurement range is greater.

3 Datalogger: the sensor can store data when is out of AirQ control unit radio range.

4 Web controlled: thanks to web oriented AirQ Networks architecture, all AirQ 121-EXT sensors are web accessibile.

5 Battery powered: AirQ 121-EXT is a battery powered wireless sensor. The battery is user replaceable.

6 Mobile ready: AirQ Networks web platform it’s fully compatibile with iPhone, Andorid and Windows Mobile devices.

7 SMS (text message) and E-Mail alarms: thanks AirQ Rule System it’s possibile to define alarms that start when a user defined event occurs. Alarms can be also sent by SMS (text message) and E-Mail without using additional device.

8 No programming required: AirQ 121-EXT sensors works just out of the box, without any particular technical skills.

9 Flexible and powerful rule system: AirQ 121-EXT sensors can be used with the flexible AirQ Networks graphical rule system. Just design your application and put it to work: they do all dirty work!

10 Installation: Just leave the sensor anywhere you want: no installation is needed!

AirQ 121-EXT Specifications as release 1.2
Sensor type Temperature
Measuring range -90°C +200°C
Measuring precision ±0,3°C
Temperature resolution ±0.0625°C
Minimum logging time 15 days
Sensor calibration allowed Yes
Measuring rate min 4 minutes – max 8 minutes
Power 3.6VDC AA size integrated battery replaceable by user
Battery life 1 year
IP Rating IP54
Radio frequency 434 Mhz
Operative distance More then 500 meters in open space
sNET Node type End Device
Dimensions 85 x 56 x 21 mm
Weight 90gr
Operating temperature -30 +85 °C
Last hardware release AirQ 121-EXT – r1.2
Last firmware release sNET protocol v. 5.0
Certifications RoHS Compliant; CE
External probe PT100

AirQ 121-EXT can be used in a unlimited number of applications. Being a flexible tool, it can be adapted to different usages and contexts. The AirQ graphical Rule System allows user to design its application and define how system react to particular temperature value. AirQ 121 can be successufully used to monitoring temperature of anything where is transported away from AirQ control unit station.

Take a look to our Applications Repository to see pratical examples on how use AirQ Networks products!

What is the maximum distance between sensors and control units or range extenders?

There isn’t a fixed rule that states what is the maximum distance between sensors and control units. Maximum distance is related to the environment where sensors are placed. In closed spaces a distance higher then 50 meters is typically achievable. In open spaces maximum distance can be extended up to 500 meters and more. Using range extender the operative range can be extended as needed. At the end, some noisy devices (motors, high inductive devices, other wireless devices operating on 433Mhz) can reduce operative distance of sensors. As rule of thumb, we suggest to test the effective position of sensors and control units before to do final installation. It’s really common to obtain better RF performances simply changing devices position of some centimeters.

How often sensors send data to control units?

AirQ 1XX sensors are designed to reduce battery consumption and give the best accuracy of measurement in the same time. All AirQ 1XX sensors are programmed to work in a double mode:

  • If temperature is stable, sensor sends data to control unit every 8 minutes. This is important both to give current detected temperature and to signal sensor activity (if control unit doesn’t receive new data in 15 minutes, sensor is considered as ‘unlinked’ – see wiki for further information).
  • If temperature change more then ±0.5°C, sensor will send data in about 4 minutes.

If you need an higher detection frequency, please contact AirQ Networks customer service.

How to install?

Every AirQ 1XX can be installed directly where needed as long as operating temperature is respected. For example, an AirQ 100 temperature sensor can be placed inside a frozen room if temperature is higher or equal then -30°C up to +85°C. Using enclosures with flange, sensor can be applied to walls or fixed surfaces using screws.

What's the better external probe for me?

Choose the probe depending of your measurement requirements. For example, a PT100 external probe is used where high measurement is mandatory, or the K thermocouple is used when measurement range spread is most important.

During purchase we will help you to choose the product more suitable

How often loggers store temperature?

AirQ 12X loggers are designed to reduce battery consumption and give the best accuracy of measurement in the same time. All AirQ 12X sensors are programmed to work in a double mode:

  • If temperature is stable, sensor stores data every 8 minutes.
  • If temperature change more then ±0.5°C, sensor will store temperature in about 4 minutes.

If you need an higher detection frequency, please contact AirQ Networks customer service.

How long does it takes to send data to control unit?

Dataloggers are designed to check if a control unit is in its operative range every 15 minutes. If datalogger detects a control unit, it starts to send all registered data.

What does it mean that a datalogger stores 'at least' 15 days of data?

There are several factor that influence how many data a datalogger can store in its internal memory. Some of these are:

  • Temperature stability
  • Environment temperature
  • Status of battery

Dataologger are designed to guarantee at least 15 days of continuous acquisitions with these condition:

  • Temperature change really often (> +/- 0.5°C in less then 4 minutes)
  • Environment temperature over -15°C
  • Battery in good condition
Can datalogger be placed inside transport container?

AirQ Networks technology allows datalogger to placed directly where needed as long operative temperature range is respected (-30°C < temp < +85°C).

This means that datalogger can’t be placed inside dry ice boxes. If needed, AirQ 121EXT datalogger can be used to register temperature of dry ice boxes. 

Are sensors calibrated? Is it possible to obtain calibration certificate?
All AirQ Networks sensor are calibrated by AirQ Networks and they guarantee declared precision for at least 1 year.
Moreover, AirQ Networks can provide calibration certificate if needed. Please contact customer service.