Heiman HS2AQ-EM

Air quality monitor

A Zigbee indoor air quality monitor with an OLED display. It measures PM2.5 from 1 to 999 µg/m³ and formaldehyde from 0.01 to 1.00 mg/m³, also reports PM10, total VOC, an air quality index, temperature and humidity, and runs from 5 V USB with a lithium backup battery.

Also sold asHS2AQ Smart Air Quality Monitor

Zigbee

Air quality monitor

Compatibility

Compatible with EpiSensor Edge over Zigbee.

Pair it with the Zigbee radio on an EpiSensor Gateway. Edge reads it locally on the Gateway.

Edge reads 9 values from it, listed under Interface.

Connect it with

Gateway ZGW-20
From €899 ex VAT Configure Gateway

Specifications

The HS2AQ-EM is the Zigbee identifier of Heiman’s HS2AQ Smart Air Quality Monitor, a round unit 96 mm across and 38 mm high that stands on a desk or mounts on a wall. It samples air by diffusion and shows its readings on an OLED display. A buzzer and a three-colour LED flag the air: green for clean, purple for light pollution and red for heavy pollution. Heiman specifies PM2.5 from 1 to 999 µg/m³ and formaldehyde from 0.01 to 1.00 mg/m³.¹

Power: DC supply. 5 V DC at 1 A through a Micro USB socket, from a mains adapter (100 to 240 V AC in). A lithium battery inside backs it up.¹
PM2.5 range: 1 to 999 µg/m³¹
Formaldehyde range: 0.01 to 1.00 mg/m³¹
Also reported: PM10 and total VOC in µg/m³, air quality index²
Temperature error: ±3 °C¹
Humidity error: ±10 % RH¹
Sampling: Diffusion¹
Display and alarm: OLED display, buzzer, and an LED that shows green for clean air, purple for light pollution and red for heavy pollution¹
Operating conditions: 0 to 40 °C, 15 to 90 % RH, non-condensing¹
Storage: 0 to 50 °C, below 90 % RH¹
Radio range: Up to 100 m; the real distance depends on the surroundings¹
Mounting: On a desk, plugged in, or on a wall¹
Dimensions: Ø96 mm, 38 mm high¹
Reporting: At least hourly, and on each change of one unit³

Where it is used

Particulate, formaldehyde and VOC levels in offices, classrooms and newly fitted-out rooms.
Indoor environmental monitoring
Air quality alongside HVAC energy data when ventilation settings change.
HVAC energy monitoring for commercial buildings

Interface

Readings and settings, with units and ranges where Heiman publishes them.^1, 2, 3

Download

Reading	Unit	Range or values	Access
Measurements 7
PM2.5Fine particulates. Standard Zigbee PM2.5 measurement cluster.	µg/m³	1 to 999 µg/m³	Read only
PM10Coarse particulates. Heiman-specific cluster.	µg/m³	-	Read only
FormaldehydeStandard Zigbee formaldehyde cluster; the raw value is divided by 1000.	mg/m³	0.01 to 1 mg/m³	Read only
Total VOCHeiman-specific cluster.	µg/m³	-	Read only
Air quality indexA unitless index from the Heiman-specific cluster.	-	-	Read only
TemperatureAccuracy ±3 °C.	°C	-	Read only
Relative humidityAccuracy ±10 % RH.	%	-	Read only
Diagnostics 2
BatteryBackup battery level. The first report can take up to 24 hours.	%	0 to 100 %	Read only
Battery stateWhether the backup battery is charging.	-	`not_chargingchargingcharged`	Read only

The Zigbee definition matches units that identify themselves as HS2AQ-EM or HS2AQ-EM-3.0. Units that report HS2AQ-EF-3.0 use a separate definition.³

Heiman’s current specification table names the Zigbee model HS2AQ-EFA, beside a Wi-Fi model (WS2AQ-A) and a HarmonyOS model (WS2AQ-H) with the same figures. Check the model the monitor reports when it joins.¹

Setup

Power it
Plug the monitor into a 5 V, 1 A Micro USB supply. The lithium battery is a backup, so keep it on USB in normal use.¹
Open pairing in Edge
In Edge, open pairing on the Gateway’s Zigbee network and bring the monitor close to the Gateway.
Confirm the join
Check that Edge identifies it as Heiman HS2AQ-EM and that PM2.5, formaldehyde and VOC readings arrive.²
Allow for the first battery report
The battery level can take up to 24 hours to appear after pairing. The air readings report hourly at the latest.²