OHAUS Navigator® NV422ZH Portable Precision Balance

Overview

The OHAUS Navigator® NV422ZH is a compact, portable precision balance engineered for reliable mass measurement in dynamic environments—including quality control labs, field-based industrial sites, educational institutions, and R&D settings where mobility, durability, and traceable repeatability are essential. Operating on electromagnetic force compensation (EMFC) principle, the NV422ZH delivers stable, drift-resistant readings across ambient temperature fluctuations (10–30 °C) and moderate humidity conditions (up to 80% RH non-condensing). Its 220 g maximum capacity and 0.01 g readability meet routine analytical requirements for sample preparation, formulation checks, inventory reconciliation, and component verification—without requiring dedicated bench space or climate-controlled infrastructure.

Key Features

• Robust mechanical architecture with reinforced ABS housing and stainless-steel weighing pan (120 mm diameter), rated for continuous operation under typical industrial handling conditions.
• Four-fold overload protection system: internal mechanical stops and firmware-limited excitation prevent sensor damage during accidental overloading up to 880 g (400% of full scale).
• Integrated transport lock mechanism secures the load cell during shipment or relocation, eliminating need for recalibration after transit.
• Fast stabilization algorithm achieves stable display within ≤1 second under standard environmental conditions—reducing operator wait time and improving throughput in high-volume workflows.
• External calibration capability using certified Class M2 weights (not included), supporting periodic verification per ISO/IEC 17025-compliant laboratory procedures.
• Auto-power-off and battery-saving mode extend operational runtime when powered by optional rechargeable Li-ion pack (up to 120 hours on single charge).

Sample Compatibility & Compliance

The NV422ZH accommodates a wide range of sample forms—including powders, granules, small components, reagent vials, and pre-weighed containers—via its open-platform design and low-profile pan geometry. It complies with international metrological requirements outlined in OIML R 76-1 (2006) for non-automatic weighing instruments, and supports audit-ready documentation practices aligned with FDA 21 CFR Part 11 when paired with OHAUS Logger Pro™ software (sold separately). While not certified for hazardous-area use, its IP42-rated enclosure provides basic protection against dust ingress and vertical dripping water—suitable for controlled indoor production floors and teaching laboratories.

Software & Data Management

Data output is supported via RS232 serial interface (standard) and optional USB-to-serial adapter for connection to Windows-based systems. The balance transmits weight data in ASCII format with user-configurable prefixes/suffixes (e.g., “WGT:”, “g”), enabling direct import into LIMS, Excel, or custom QC databases. When used with OHAUS Logger Pro™, users can generate timestamped, user-ID-tagged records with automatic metadata capture (date/time, stability flag, calibration status), fulfilling GLP/GMP data integrity expectations for regulated environments. Audit trail functionality includes event logging for calibration, zeroing, unit changes, and overload incidents.

Applications

• Raw material receipt inspection in pharmaceutical and food manufacturing facilities.
• Teaching quantitative analysis techniques in undergraduate chemistry and physics laboratories.
• Field-based calibration verification of pipettes and volumetric glassware using gravimetric methods (ASTM E542, USP <41>).
• Batch record documentation for compounding operations requiring weight-based formulation inputs.
• Inventory management of consumables such as filters, electrodes, and calibration standards in service workshops.
• Pre-shipment verification of packaged goods meeting net-weight labeling regulations (e.g., EU Directive 2009/72/EC).

FAQ

Is the NV422ZH suitable for use in regulated GxP environments?
Yes—when operated with documented external calibration, defined SOPs, and paired with compliant data capture tools (e.g., Logger Pro™), it supports GMP/GLP-aligned workflows. Full 21 CFR Part 11 compliance requires additional IT controls beyond the instrument itself.
What class of calibration weights should be used for routine verification?
Class M2 weights per ISO 9001 and OIML R 111 are recommended for daily checks; Class M1 weights are advised for initial calibration and periodic verification.
Does the balance include internal calibration?
No—the NV422ZH uses external calibration only, which enhances long-term stability and simplifies maintenance in shared-use environments.
Can the unit be powered by AC adapter while operating?
Yes—AC power supply (model PS120-100) is available as an accessory and enables continuous operation without battery drain.
What is the warranty coverage for the NV422ZH?
OHAUS provides a 2-year limited warranty covering parts and labor for defects in materials and workmanship under normal use conditions.