Supported Applications
The AQM-101 is a desktop formaldehyde (HCHO) monitor and data logger built for indoor air quality (IAQ) diagnosis and HVAC system performance verification. It simultaneously measures and displays HCHO concentration, air temperature, and relative humidity, making it well suited to inspecting residences, offices, schools, and manufactured or newly renovated spaces where off-gassing from building materials and furnishings is a concern.
Three "smiley" icons on the large LCD indicate indoor air quality levels at a glance, while a programmable high alarm with audible and visible LED warnings alerts occupants when concentrations climb. The device continuously computes TWA (Time Weighted Average over 8 hours) and STEL (Short-Term Exposure Limit over 15 minutes) values, supporting exposure assessments against published guidance.
Local regulatory exposure limits will vary. For reference, the unit's documentation lists non-enforced levels such as 0.03 ppm (background outdoor air), 0.10 ppm (a recommended residential upper limit), and 2.00 ppm (a typical OSHA STEL reference).
Operating Conditions & Performance
The AQM-101 measures HCHO across a range of 0.00 to 5.00 ppm, with a resolution of 0.01 ppm for formaldehyde. Temperature is monitored over 0 to 50°C (32 to 122°F) and relative humidity over 10 to 90% RH. HCHO accuracy is specified as ±5%, ±0.03 ppm, temperature accuracy as ±0.1°C, and humidity accuracy as ±5% RH at 25°C (77°F).
The electrochemical sensor delivers a fast response of less than 30 seconds (T90) and has an expected life of 3 years. Onboard memory stores 32,000 points of logged data. The unit is powered by 4 'AAA' batteries with an optional AC adaptor, and connects to a PC over USB for download. It weighs 165 g (5.8 oz) and carries CE approval. Recommended storage is -40 to 70°C (-40 to 158°F).
Configuration Options
The series centers on a single instrument configuration, the AQM-101, which integrates HCHO, relative humidity, and temperature measurement together with data logging in one desktop unit. All core capabilities — the electrochemical HCHO sensor, LCD display, programmable high alarm, manual 0 ppm calibration, and audible/visible LED warnings — are delivered by this base model.
The only functional difference in the lineup comes from powering options: the base AQM-101 runs on batteries, and adding the AQM-100-PW AC adaptor accessory enables continuous mains-powered logging for long, unattended monitoring sessions.
Key Product Differences
• AQM-101 — HCHO, RH and temperature monitor and data logger.
• AQM-100-PW — AC adaptor (optional).
Each unit ships with a USB cable, operator's manual, and software CD, so it is ready for logging and PC download out of the box.
| Additional Features 1 | Wrong Location Environmental Monitor |
| Accuracy | ± 5 % , + 0.03 ppm |
| Air Quality Measurement | 0 to 5 ppm |
| Air Quality Measurement Note | 0.00 to 5.00 ppm @25ºC (77ºF), ambient pressure |
| Battery Size And Type | Alkaline AAA |
| Data Interface | USB |
| Display Type | LCD |
| Height | 110 mm |
| Length | 28 mm |
| Memory | 32,000 readings |
| Number of Batteries | 4 |
| Process Temperature, Max | 50 °C |
| Process Temperature, Min | 0 °C |
| Relative Humidity | 10 to 90% |
| Relative Humidity Accuracy | ± 5% RH |
| Relative Humidity Accuracy Note | ±5% RH [at 25ºC (77ºF)] |
| Resolution | 0.01 ppm |
| Response Time | < 30 sec (T90) |
| Sensor Type | Stable Electrochemical |
| Series ID | AQM-101-HCHO-Monitor |
| Storage Temperature, Max | 70 °C |
| Storage Temperature, Min | -40 °C |
| Temperature Accuracy | ± 0.1 °C |
| Temperature Resolution | 0.1 °C |
| Weight | 165 g |
| Width | 108 mm |