Physical specs


948 gram (incl. internal battery, excl. solarpanel and mount)


Dimensions of the CityProbe 2

Dimensions of the CityProbe 2


Lifespan and servicing

Lifespan and servicing intervals is directly correlated to the context that the unit is operating in, including temperature, humidity and overall seasonal variations.

Our high-performance solarpanels has a lifespan over +10 years with a high UV resistant coating.

The internal hardware is protected by both hydrophobic mesh at air inlets and outlets, with electronics being coated and encapsulated to prevent damage from high air humidity.

Active components, such as the particulate matter sensor and fans have a MTBF (mean-time before failure) of approximately 7 years.

CityFlow has a device health algorithm in check that monitors each CityProbe 2’s array of sensors.

Environment conditions

Operating temperature: -35°C ~ 65°C


Data and communication

Quectel EG91-E modem

Backwards-compatible with existing GSM/GPRS and UMTS/HSPA+ networks, ensuring that it can be connected even in remote areas devoid of 4G network coverage.

  • LTE category 1 module for EMEA region (Europe, Middle East, East Asia)

  • 3GPP E-UTRA Release 13

  • LTE FDD Cat 1 bands supported: B1/B3/B7/B8/B20/B28A

  • WCDMA: B1/B8

  • GSM/EDGE: B3/B8


Carrier (Europe): Deutsche Telekom

Global: GCF

Europe: CE

Brazil: Anatel (ongoing)

Australia & New Zealand: RCM

Russia: FAC

Others: WHQL/RoHS


Noise sensor

Precision, accuracy and range:

  • 100Hz ~ 10kHz

  • Omnidirectional (-42dB ±3dB @ 94dB SPL)

  • 59dB S/N ratio

Note: Initial calibration at AU Engineerings sound lab done by MONTEM

Temperature sensor

Precision, accuracy and range:

Temperature accuracy:
-20 °C to 50 °C

-0.1 (min) ±0.05 (typ) 0.1 (max)

Operating temperature: -55°C to 150°C

Pressure sensors

Accuracy and range, operating temperature

Operating Pressure: 260 hPa to 1260 hPa

Accuracy: +/- 1 hPa, +/- 4 hPa

Operating Temperature: -40 C to +85 C

Humidity and Temperature sensor

Accuracy and range, operating temperature :

RH Range: 0 % to 100 %

RH Accuracy: +/- 2 %

Full Temp Accuracy: 0.3 C

Operating Temperature: - 40 C to +125 C

UV Index/Ambient Light sensor

Accuracy and range:

Accuracy UV sensor: 0 to > 20 uV

Ambient light sensor resolution: <100 mlx

Ambient Light sensors

Tolerance, range, resolution:

ALS output tolerance: ≤ 10 %

Range: 0 lx to about 120 klx

Resolution: 0.0036 lx/ct

Particulate Matter sensor

Mass concentration range and precision (μg/m3):

Mass concentration range: 0 to 1’000 μg/m3

Precision for PM1 and PM2.5:

±10 μg/m3 @ 0 to 100 μg/m3,

±10 % m.v. @ 100 to 1000 μg/m3

Precision for PM4, PM10:

±25 μg/m3 @ 0 to 100 μg/m3,

±25 % m.v. @ 100 to 1000 μg/m3

Number concentration range and precision (#/cm3):

Number concentration range:

0 to 3’000 #/cm3

Precision for PM1 and PM2.5:

±100 #/cm3 @ 0 to 1000 #/cm3

±10 % m.v. @ 1000 to 3000 #/cm3

Precision for PM4, PM10:

±250 #/cm3 @ 0 to 1000 #/cm3

±25 % m.v. @ 1000 to 3000 #/cm3


Range and sensitivity:

Measurement Range:

±2, ±4, ±8, ±16 g


256 (±2g) ~ 32 (±16g) LSB/g

4 mg/LSB


0.05Hz ~ 1.6kHz

Fuel Gauge (battery monitor)

Precision and operating temperature:

Voltage Error: ±7.5 mV/cell

Voltage-Measurement Resolution: 1.25 mV/cell

Operating Temperature Range: -40°C to +85°C


Frequency: 1.575GHz, 1.602GHz

Sensitivity: -165dBm

Data Rate (Max): 400kbps


RGB Light Output

Note: The RGB LEDs on the top sensor board provides visual feedback to pedestrians about the measurements.



Peak power usage: 4,3V 1A (when broadcasting over LTE)

Can accept up to 12 V input for charging.

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