Access Sensor Technologies' Home Health Box

The Home Health Box (HHB) is a compact indoor air sampler and monitor. The HHB can be configured to sample and sense a range of pollutants:

Up to two particulate matter sampling channels
Up to two active gas sampling channels
Time-resolved particulate matter sensing
Time-resolved CO₂ sensing
Time-resolved sensing of up to five additional gases (e.g., NO₂, CO) using electrochemical sensors

All samples are collected using the same virtually-silent pumping technology as our Ultrasonic Personal Air Sampler (UPAS).

Quantity	The Home Health Box can configured with 0, 1, or 2 particulate matter sampling channels
Flow rate	1.0 or 2.0 L min^-1 (depending on the size-selective inlet used)
Flow rate accuracy	± 4% of setpoint (actively controlled)
Available size-selective inlets	PM_2.5 @ 1 L min^-1, PM_{2.5 @} 2 L min^-1, Respirable PM @ 2 L min^-1, PM₁₀/Thoracic @ 2 L min^-1
Filter size	37 mm (default) or 25 mm; quick-change filter cartridges for easy in-field handling
Maximum back pressure	7.0" H₂O @ 1 L min^-1, 4.5" H₂O @ 2 L min^-1

Baseline sensor package	Particulate matter: Sensirion SEN55 (laser light scattering) Carbon dioxide (CO₂): Sensirion SCD30 (non-dispersive infrared; NDIR) tVOCs and NO_x (qualitative estimates): Sensirion SGP41 (MOx)
Electrochemical sensors for additional pollutants	Up to four Alphasense B-series sensors: NO2-B43F for nitrogen dioxide, CO-B4 for carbon monoxide; contact our engineering team if you'd like sensors for other pollutants (e.g., NO, O₃) added to your HHB. We can also include the Sensirion SFA30 formaldehyde sensor in your HHB as an experimental feature; however, the accuracy of data reported by this sensor has not been evaluated by AST.

Power supply	15 W, 5 V USB Type-C^®
Line power	The Home Health Box can run indefinitely when plugged into a wall outlet
Battery	Li-ion; 24 W-h; battery life will depend on the sample configuration, filter media, sorbent media, and local air density; 8-h runtime on battery when collecting two filter samples on MTL PTFE membrane filters at 2 L min^-1and two gas samples on Markes Carbopack X SafeLok™ thermal desorption tubes at 30 mL min^-1 with PM sensor, CO₂ sensor, formaldehyde sensor, and one Alphasense B-series electrochemical sensor running in a location with 1.0 g L^-1 air density.
Charging time	When the HHB is not running, the battery will charge fully in 2 h using the provided 15 W, 5 V USB Type-C wall adapter.

Exterior size	213 mm × 132 mm × 107 mm, excluding size-selective inlets
Weight	Up to 1.5 kg; depends upon configuration and sample media installed (all sample media to be provided by the user)
Noise	< 50 dB at 25 cm distance

Memory type	microSD™ card
Data logging interval	5, 15, 30, or 60 s; default = 30 s

Temperature	Operating = -20 to 60 °C; Charging = 0 to 45 °C; Storage = -20 to 50 °C
Relative humidity	Up to 95% at 40 °C (non-condensing)
Altitude	2,500 ft (760 m) below sea level to 20,000 ft (6,100 m) above sea level; all sample flow rates will be adjusted automatically for variations in air density within this altitude range.

Home Health Box