OHAUS Navigator® NV222ZH Portable Balance
| Brand | OHAUS |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Manufacturer |
| Product Category | Domestic |
| Model | NV222ZH |
| Instrument Type | General-Purpose Portable Balance |
| Maximum Capacity | 220 g |
| Readability | 0.01 g |
| Repeatability | ±0.01 g |
| Calibration Method | External Calibration |
| Stabilization Time | ≤1 s |
| Display | Backlit LCD |
| Pan Size | 130 mm diameter |
| Overload Protection | Up to 500% of capacity |
| Power Source | AC adapter or 4 × AA batteries (included) |
| Compliance | ISO 9001 manufacturing environment, supports GLP/GMP documentation workflows |
Overview
The OHAUS Navigator® NV222ZH is a general-purpose portable balance engineered for precision and operational efficiency in educational laboratories, quality control checkpoints, field sampling stations, and light industrial environments. Built upon OHAUS’s decades-long heritage in mass measurement instrumentation, this model employs electromagnetic force restoration (EMFR) sensing technology—ensuring high reproducibility and minimal drift across ambient temperature fluctuations. With a maximum capacity of 220 g and readability of 0.01 g (10 mg), the NV222ZH delivers Class II performance per OIML R76 and meets the accuracy requirements specified in ASTM E898–22 for non-automatic weighing instruments used in routine analytical tasks. Its compact footprint and integrated battery operation support mobility without compromising metrological integrity.
Key Features
- Rapid stabilization: Achieves stable readings in ≤1 second under standard laboratory conditions (20–25 °C, <60% RH), minimizing throughput delays during high-volume sample processing.
- Robust overload protection: Mechanically and electronically safeguarded against loads up to 500% of rated capacity (1100 g), extending sensor life and reducing recalibration frequency.
- Backlit LCD display: 15-mm character height with contrast adjustment ensures legibility under variable lighting—including low-illumination field settings or glove-box use.
- Large weighing pan: 130 mm diameter stainless steel pan accommodates volumetric flasks, petri dishes, and irregularly shaped samples while maintaining center-of-gravity stability.
- External calibration compatibility: Supports traceable calibration using certified weights compliant with ISO/IEC 17025-accredited standards; calibration log entries are timestamped and user-identifiable.
- Dual power architecture: Operates continuously via included AC adapter or up to 100 hours on four AA alkaline batteries—enabling deployment in locations without reliable mains access.
Sample Compatibility & Compliance
The NV222ZH is optimized for solid and granular samples ranging from powders and tablets to small mechanical components and biological specimens. Its sealed keypad and IP30-rated enclosure provide resistance to dust ingress and incidental splashes—suitable for shared lab benches or production line integration. The balance complies with ISO 9001-certified manufacturing protocols and supports regulatory documentation needs through configurable print output (via optional RS-232 or USB interface) that includes date/time stamps, operator ID, and net/gross/tare identifiers. While not FDA 21 CFR Part 11–validated out-of-the-box, audit trails generated via OHAUS LoggerPro™ software (v3.2+) meet GLP and GMP data integrity expectations when deployed with appropriate procedural controls.
Software & Data Management
Data export is facilitated via optional serial (RS-232) or USB virtual COM port connectivity. When paired with OHAUS LoggerPro™ software, users can configure automated data logging intervals, apply statistical filters (e.g., moving average, outlier rejection), and generate CSV- or Excel-compatible reports compliant with internal QA templates. All recorded measurements include metadata such as environmental timestamp, instrument serial number, calibration status flag, and active tare value—enabling full traceability in accordance with ISO/IEC 17025 clause 7.7. Firmware updates are delivered via OHAUS’s secure web portal and require manual initiation to preserve configuration integrity.
Applications
- Student laboratories: Quantitative preparation of reagents and standards in chemistry and biology curricula.
- Pharmaceutical QC: Weighing excipients, active pharmaceutical ingredients (APIs), and finished dosage forms prior to compression or encapsulation.
- Food testing labs: Portion control verification, moisture loss analysis, and ingredient reconciliation during pilot-scale formulation trials.
- Maintenance workshops: Calibration verification of torque wrenches, load cells, and other mechanical test equipment using known-mass reference standards.
- Environmental field kits: Soil sample partitioning, filter weight tracking pre/post-extraction, and particulate matter gravimetric analysis.
FAQ
What calibration weights are recommended for the NV222ZH?
A 200 g Class M2 or better certified weight is required for full-span verification; OHAUS recommends part #22222200 (200 g M2 stainless steel weight) for traceable external calibration.
Can the NV222ZH be used in a fume hood?
Yes—its sealed membrane keypad and absence of internal ventilation fans allow safe operation in low-airflow enclosures, provided ambient temperature remains within 10–40 °C and humidity stays below 80% RH non-condensing.
Is auto-zero tracking enabled by default?
Yes—the balance performs automatic zero-point correction at power-on and every 30 minutes during idle periods, adjustable via service menu if environmental drift compensation must be disabled for specific SOPs.
Does it support unit conversion beyond grams?
Yes—selectable units include carats (ct), ounces (oz), pounds (lb), and troy ounces (ozt), all referenced to the same 0.01 g base resolution.
How is firmware updated?
Firmware is updated manually via USB connection using OHAUS Update Utility v2.4+, available for download from the official OHAUS support portal after product registration.
