Mettler Toledo EM120 Infrared Moisture Analyzer
| Origin | Switzerland |
|---|---|
| Model | EM120 |
| Maximum Capacity | 124 g |
| Readability | 0.001 g / 0.01% |
| Pan Diameter | 90 mm |
| Repeatability | ±0.2% (1 g sample), ±0.02% (10 g sample) |
| Heating Source | Halogen lamp |
| Temperature Range | 30–230 °C |
| Temperature Increment | 1 °C |
| Heating Mode | Boost function (140% target temperature for first 3 min) |
| Termination Criteria | Automatic, semi-automatic (user-defined mass change per second), or time-based (0.1–240 min) |
| Data Output Interval | 0.1–10.0 min |
| Stored Methods | 5 user-defined profiles |
| Security | Password-protected settings, physical lock slot |
| Interface | RS232 |
| Firmware Update | Network-enabled via PC connection |
Overview
The Mettler Toledo EM120 Infrared Moisture Analyzer is a precision laboratory instrument engineered for rapid, reproducible determination of moisture content in solid and semi-solid samples using halogen infrared heating coupled with high-resolution analytical weighing. Based on the loss-on-drying (LOD) principle, the EM120 simultaneously measures mass loss during controlled thermal drying and calculates moisture percentage relative to initial sample weight. Its integrated dual-sensor architecture—comprising a high-stability monolithic load cell (0.001 g readability) and a calibrated halogen heating module—ensures traceable, GLP-compliant results across diverse matrices including pharmaceutical powders, food ingredients, polymers, and inorganic salts. Designed and assembled in Switzerland, the EM120 meets stringent metrological requirements for routine QC testing and method validation in regulated environments.
Key Features
- Halogen lamp heating system delivering uniform radiant energy distribution and rapid thermal response—achieving setpoint temperature in under 60 seconds for most protocols.
- Boost heating mode: automatically elevates power output to 140% of nominal setpoint during the first 3 minutes to accelerate initial drying without compromising sample integrity.
- Large-diameter (90 mm) stainless-steel weighing pan with ergonomically designed lift handle—minimizing operator exposure to heat and enabling safe handling of hot samples post-analysis.
- High-contrast green-backlit LCD display optimized for readability under varied ambient lighting conditions in laboratory and production settings.
- Pre-heating function (30–100 °C) allows stabilization of the chamber prior to sample introduction, reducing thermal shock and improving inter-run consistency.
- Five programmable method slots with password protection—supporting secure storage of validated SOPs and preventing unauthorized parameter modification.
- Integrated RS232 interface compliant with standard serial communication protocols for direct connection to LIMS, printers, or PCs running Mettler Toledo LabX or third-party data acquisition software.
Sample Compatibility & Compliance
The EM120 accommodates a broad range of sample types—including hygroscopic powders, granules, pastes, and thin films—with minimal preparation. Its open-chamber design permits easy loading and visual monitoring during analysis. The instrument conforms to international standards governing moisture analysis methodology, including ASTM D4442 (wood moisture), ISO 712 (cereals), and USP (moisture content). All firmware and operational logic are architected to support audit-ready workflows aligned with FDA 21 CFR Part 11 requirements—featuring electronic signature capability, full audit trail logging, and tamper-evident data export. Physical security features—including a built-in lock slot and configurable access passwords—further reinforce compliance with GLP and GMP documentation practices.
Software & Data Management
Data output is configurable at intervals from 0.1 to 10.0 minutes, enabling granular kinetic profiling of drying behavior. Results include initial mass, final mass, moisture %, dry residue %, and elapsed time—formatted for direct integration into Excel or statistical process control (SPC) platforms. Firmware updates are delivered via network-connected PC using Mettler Toledo’s official update utility, ensuring continuous alignment with evolving regulatory expectations and performance enhancements. Printouts generated via RS232-connected thermal printers include sample ID, operator ID, timestamp, method name, and GLP header fields—fully traceable and suitable for regulatory submission.
Applications
The EM120 serves as a core tool in quality control laboratories across multiple industries: quantifying residual solvents in API batches; verifying moisture specifications in excipients per ICH Q5C guidelines; monitoring shelf-life stability of nutraceutical tablets; validating drying endpoints in lyophilization process development; and assessing water activity proxies in food manufacturing (e.g., flour, coffee, dairy powders). Its repeatability performance—±0.02% RSD at 10 g loading—supports statistically robust trend analysis over extended calibration cycles.
FAQ
What is the typical drying time for a 2 g pharmaceutical powder sample?
Drying duration varies by matrix and setpoint temperature but commonly falls between 3–8 minutes at 105 °C using automatic termination.
Does the EM120 support method transfer from older Mettler Toledo models like the HG series?
Yes—parameter mapping tables and conversion utilities are provided in the LabX migration toolkit to ensure continuity of validated methods.
Is calibration traceable to national standards?
Internal calibration uses factory-traceable weights; external verification follows ISO/IEC 17025-accredited procedures using NIST-traceable mass standards.
Can the instrument operate unattended overnight?
Time-based termination (up to 240 minutes) and auto-shutdown after completion enable safe unattended operation when housed in ventilated lab environments.
How is data integrity maintained during power interruption?
Non-volatile memory preserves active method parameters and last-run results; no data loss occurs during brief outages, though ongoing measurements halt and require manual restart.
