MAS-100 NT Air Microbial Sampler by Merck

Overview

The MAS-100 NT Air Microbial Sampler by Merck is a precision-engineered, portable active air sampler designed for quantitative assessment of viable airborne microorganisms in controlled environments. It operates on the principle of inertial impaction: aerosolized particles are drawn through a precisely engineered slit-shaped orifice and accelerated onto the surface of a standard 90 mm nutrient agar plate at defined flow velocities. This physical separation mechanism ensures high collection efficiency for particles ≥0.6 µm aerodynamic diameter—covering bacteria, yeasts, molds, and other culturable bioaerosols—while preserving microbial viability for subsequent colony enumeration and identification. Developed specifically for compliance-critical applications, the MAS-100 NT meets the functional requirements of ISO 14698-1 (Biocontamination control), EU GMP Annex 1 (Manufacture of Sterile Medicinal Products), and USP (Microbiological Control and Monitoring of Aseptic Processing Environments). Its robust architecture, calibrated airflow delivery, and traceable performance make it a reference instrument for environmental monitoring programs in pharmaceutical manufacturing, biotechnology cleanrooms, hospital isolation units, and regulatory testing laboratories.

Key Features

• High-precision digital mass flow controller with real-time feedback and automatic compensation for ambient pressure and temperature variations
• Programmable sampling modes: fixed-volume (L), time-based (min), or continuous operation with user-defined start/stop triggers
• Integrated rechargeable lithium-ion battery enabling up to 5.5 hours of uninterrupted operation—ideal for multi-point surveys across large cleanroom suites
• Ergonomic, lightweight housing (≤2.8 kg) with IP54-rated ingress protection against dust and splashing water
• Self-diagnostics and system verification routines compliant with ALCOA+ data integrity principles
• Traceable calibration certificate supplied with each unit, aligned to national standards (e.g., METAS, NIST-traceable reference instruments)

Sample Compatibility & Compliance

The MAS-100 NT accepts standard 90 mm Petri dishes filled with commonly used microbiological media—including Tryptic Soy Agar (TSA), Sabouraud Dextrose Agar (SDA), and Casein Soybean Digest Agar—without requiring proprietary consumables. Its impaction geometry maintains consistent shear stress across the agar surface, minimizing desiccation and mechanical damage to sensitive colonies. All operational parameters—including flow rate, duration, and sampling location—are documented in accordance with FDA 21 CFR Part 11 requirements when paired with Merck’s optional MAS-Link software (v3.2+), supporting audit-ready electronic records, user access controls, and immutable audit trails. The device is certified to IEC 61000-6-3 (EMC emissions) and IEC 61000-6-2 (immunity), and conforms to ISO 8573-7 for compressed air microbiological sampling when used with appropriate inlet adapters.

Software & Data Management

Merck’s MAS-Link PC software provides comprehensive configuration, remote operation, and post-sampling analysis capabilities. It supports automated generation of EU GMP-compliant environmental monitoring reports—including trend charts, action/alert limit overlays, and statistical summaries (e.g., CFU/m³, log reduction calculations). Data export is available in CSV, PDF, and XML formats compatible with LIMS integration (via ASTM E1482 or HL7 interfaces). All electronic records include timestamped operator ID, instrument serial number, calibration status flags, and deviation alerts—fully satisfying GLP and GMP documentation requirements for inspection readiness.

Applications

• Routine environmental monitoring (EM) in Grade A/B/C/D cleanrooms per EU GMP Annex 1
• Media fill simulation validation and intervention testing
• Investigation of microbial excursions and root cause analysis
• Validation and requalification of HVAC systems and unidirectional airflow devices
• Environmental baseline establishment during facility commissioning
• Supporting ISO 14644-1 particle count correlation studies with concurrent microbial data

FAQ

Is the MAS-100 NT suitable for use in Grade A laminar airflow workstations?
Yes—its low-vibration motor design, laminar-flow-optimized inlet geometry, and ability to operate at precisely controlled low flow rates (e.g., 100 L/min) ensure minimal disruption to unidirectional airflow patterns while maintaining validated collection efficiency.
Does the instrument require annual recalibration?
Merck recommends annual factory recalibration using NIST-traceable flow standards; however, users must perform daily or pre-use verification using a primary-standard dry calibrator (e.g., Gilian Gilibrator-2) as part of their SMP.
Can it be integrated into a centralized environmental monitoring system (EMS)?
Yes—via RS-232 or USB-to-serial interface, the MAS-100 NT supports Modbus RTU protocol for seamless integration with third-party EMS platforms meeting ISA-88/ISA-95 architecture guidelines.
What is the maximum allowable particulate loading before filter clogging affects accuracy?
The unit incorporates a dual-stage particulate pre-filter (10 µm mesh + electrostatic capture layer); performance remains stable up to 10⁶ particles/m³ (≥0.5 µm) over full runtime without measurable drift in flow accuracy.