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Chilled-Mirror Water Activity Meter

Product Number：

AW-M1

Product Difference：

Benchtop laboratory water activity meter employing the chilled-mirror dew-point reference method to measure fundamental thermodynamic equilibrium directly without sensor calibration curves. Equipped with active constant-temperature control at 25°C (±0.2°C), automated dual-salt calibration, built-in rechargeable lithium battery, and integrated thermal report printing.

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Product Details

HM Instruments AW-M1 chilled-mirror water activity meter with 7-inch color touchscreen and active temperature control

Six core advantages of AW-M1 water activity meter including chilled-mirror reference method and constant temperature control

Six major application industries for AW-M1 water activity meter across food, grains, pharma, cosmetics, and testing labs

Chilled-mirror dew-point measurement workflow and reference method compliance with AOAC, USP, and Chinese Pharmacopoeia

Authoritative testing standards compliance for AW-M1 water activity meter including GB 5009.238-2016 and OIML R121

Reference-grade chilled-mirror dew-point method specifications with 0.1 to 1 aw range and plus-minus 0.01 aw accuracy

Active temperature control chamber maintaining 25 degrees Celsius constant temperature with plus-minus 0.2 degrees precision

Built-in high-capacity rechargeable lithium battery ensuring uninterrupted testing and power outage protection

Intelligent automatic balance determination algorithm monitoring moisture equilibrium with automated 5 to 15 minute testing

Practical configurations of AW-M1 water activity meter featuring dual-salt calibration, 10-year storage, and thermal printing

Comprehensive technical specifications table of HM Instruments AW-M1 chilled-mirror dew-point water activity meter

Shandong Hengmei Electronic Technology corporate headquarters, team, and instrument manufacturing capabilities

Product Overview

The HM Instruments AW-M1 Chilled-Mirror Water Activity Meter is an advanced benchtop analytical instrument designed for rapid, highly precise determination of water activity (aw) across food products, grains, pharmaceuticals, and cosmetics. Under sealed and constant-temperature conditions, the relative humidity of the headspace air surrounding a sample reaches thermodynamic equilibrium with the sample itself, where the equilibrium relative humidity (ERH) divided by 100 corresponds directly to the sample water activity.

Operating on the fundamental chilled-mirror dew-point method, the AW-M1 directs a constant-speed airflow over an electronically chilled mirror. An integrated optical sensor detects the exact condensation dew-point threshold, while a high-precision thermocouple measures the mirror temperature at condensation onset. Thermodynamic equations then calculate relative humidity and water activity directly. Because this measurement relies on first principles of thermodynamic equilibrium rather than secondary sensor electrical resistance or capacitance shifts, the AW-M1 eliminates calibration curve drift and provides superior measurement traceability recognized by AOAC, USP, and the 2025 Edition of the Chinese Pharmacopoeia.

Key Features

Fundamental Reference Method: Direct chilled-mirror dew-point sensing acquires true thermodynamic equilibrium parameters without dependence on empirical calibration curves, ensuring rigorous traceability and regulatory acceptance.
Active Constant-Temperature Control: Integrated Peltier thermal module maintains an internal testing chamber temperature of 25°C with ±0.2°C precision, isolating tests from ambient room temperature fluctuations.
High Precision and Wide Range: Covers a broad testing span from 0.1000 to 1.0000 aw with ±0.01 aw maximum permissible error, 0.0001 aw resolution, and repeatability ≤3%.
Intelligent Automatic Balance Endpoint: Proprietary equilibrium detection algorithm monitors chamber humidity dynamics in real time and automatically records final stable readings within 5 to 15 minutes without manual intervention.
Streamlined Dual-Salt Calibration: Requires only two standard saturated salt solutions (magnesium chloride and potassium sulfate) for automated routine calibration, drastically reducing routine maintenance overhead.
Built-in Rechargeable Lithium Battery: High-capacity lithium battery safeguards uninterrupted operation during unexpected mains power loss, preserving sample test integrity and raw data.
Comprehensive Data and Connectivity: Features an intuitive 7-inch color capacitive touchscreen running Android, built-in thermal report printing, USB data export to Excel/LIMS, and Wi-Fi cloud connectivity with OTA firmware updates.
Robust Benchtop Architecture: Compact footprint (306 × 237 × 213 mm) and lightweight 3.8 kg construction with corrosion-resistant sample compartment and replaceable 7 mL sample cups.

Applications

The AW-M1 fulfills water activity testing requirements across analytical laboratories, quality assurance departments, and industrial manufacturing plants:

Food Industry: Finished food products, baked goods, confectionery, snack foods, dehydrated ingredients, powders, seasonings, and food additives under GB 5009.238-2016 Method 2.
Grain and Oil Inspection: Grain storage monitoring and moisture evaluation for wheat, paddy rice, soybeans, corn, and oilseeds under GB/T 34790-2017.
Pharmaceutical Industry: Solid dosage forms, tablets, capsules, active pharmaceutical ingredients (APIs), excipients, herbal extracts, and biological products adhering to pharmacopoeial microbial safety standards.
Cosmetics and Personal Care: Creams, lotions, pastes, powders, and emulsions to optimize preservative efficacy and ensure microbial stability.
Third-Party Inspection Laboratories: Commercial testing institutions requiring high-throughput, legally traceable testing compliant with OIML R121 and GB/T 43859-2024.
Research and Education: Food science, agricultural engineering, and pharmaceutical chemistry research in universities and scientific academies.

Technical Specifications

Parameter	Specification
Measurement Range	0.1000 ~ 1.0000 aw
Maximum Permissible Error (Accuracy)	±0.01 aw
Resolution	0.0001 aw
Repeatability	≤3%
Measurement Duration	5 ~ 15 min (sample dependent)
Constant Chamber Temperature	25°C
Temperature Control Precision	±0.2°C
Sample Temperature Resolution	0.1°C
Sample Cup Volume	7 mL
Operating System	Android embedded platform
User Interface	7-inch color capacitive touch screen
Internal Data Storage	≥10 years record retention
Communication Interfaces	USB / Wi-Fi
Report Printing	Integrated thermal line printer
Cloud Features	Wi-Fi remote OTA firmware upgrade and cloud data sync
Power Backup	Built-in high-capacity rechargeable lithium battery
Operating Power Supply	100 ~ 240 VAC, 50/60 Hz (global universal)
Rated Power Consumption	≤30 W
Operating Ambient Temperature	15 ~ 35°C
Operating Ambient Humidity	0 ~ 90% RH (non-condensing)
Instrument Dimensions	306 mm × 237 mm × 213 mm
Net Weight	3.8 kg

Configuration / Accessories

AW-M1 Chilled-Mirror Water Activity Meter main analyzer unit
Reusable/replaceable 7 mL sample testing cups
Calibration standard reagents (magnesium chloride and potassium sulfate verification pack)
Mains power adapter cord (100-240 VAC)
High-speed thermal printer paper roll
Comprehensive user operation manual and factory inspection certificate

Operation and Support

The AW-M1 simplifies routine water activity measurement into a straightforward three-step workflow:

Sample Loading: Dispense approximately 7 mL of solid, powder, or liquid sample into the sample cup, insert into the sample chamber, and lock the sealed cover.
Automated Measurement: Select the test protocol on the 7-inch touchscreen. The active Peltier controller stabilizes temperature at 25°C, while the balance algorithm monitors optical condensation signals until endpoint equilibrium is attained (typically 5 to 15 minutes).
Data Output and Traceability: View results directly on screen, print instant testing tickets via the internal thermal printer, or export historical records through USB to Excel or connected laboratory LIMS networks.