DYM3 Aneroid Barometer
| Brand | Beijing Sanpu |
|---|---|
| Origin | Beijing, China |
| Manufacturer | Yes |
| Type | Domestic |
| Model | DYM3 |
| Price | Upon Request |
Overview
The DYM3 Aneroid Barometer is a precision mechanical instrument engineered for direct, mercury-free measurement of atmospheric pressure in field and laboratory environments. Based on the classical aneroid principle, it employs a vacuum-sealed, corrugated metal capsule (aneroid cell) as its primary sensing element. Atmospheric pressure induces elastic deformation of the capsule, which is mechanically amplified via a low-friction lever system and transmitted to a calibrated analog pointer. This passive, self-contained architecture requires no power supply, ensuring operational reliability under remote, mobile, or infrastructure-limited conditions. Designed for long-term stability and environmental resilience, the DYM3 meets fundamental metrological requirements for routine barometric monitoring across meteorological observatories, aviation ground support units, geological survey teams, agricultural research stations, and industrial process safety applications where traceable, non-electronic pressure reference is mandated.
Key Features
- Mechanical aneroid sensing principle — eliminates mercury hazards and complies with global RoHS and Minamata Convention requirements
- Compact, portable form factor (156 × 156 × 115 mm) and lightweight design (≤1.5 kg) optimized for field deployment and handheld operation
- Measurement range: 800–1064 hPa — covers standard sea-level to high-altitude atmospheric pressure conditions
- Operating temperature range: −10 °C to +40 °C — suitable for temperate and subtropical climatic zones
- Scale resolution: 1 hPa on main dial; integrated thermometer with 1 °C resolution for concurrent ambient temperature recording
- Calibration traceability: Supplied with official verification certificate specifying temperature correction coefficient (a), scale correction values (Δps), and supplemental correction (Δpd)
- Zero-error mitigation: Incorporates tapping mechanism to release static friction in gear train prior to reading, enhancing repeatability
Sample Compatibility & Compliance
The DYM3 is intended exclusively for ambient atmospheric pressure measurement in open-air or ventilated indoor environments. It is not designed for sealed vessel pressure, differential pressure, or dynamic pressure applications. Its mechanical construction conforms to national verification regulation JJG 272–2019 (Aneroid Barometers) issued by the People’s Republic of China’s State Administration for Market Regulation. While not certified to ISO/IEC 17025 for accredited calibration, its design aligns with foundational principles referenced in ISO 9001 quality management systems for instrumentation control. The device supports GLP-compliant manual data recording when used in conjunction with standardized log sheets and verified correction procedures.
Software & Data Management
As a purely analog, non-digital instrument, the DYM3 does not interface with software or digital acquisition systems. All measurements are manually recorded and corrected using the three-stage correction methodology defined in its operating instructions: (1) temperature correction (ΔPt = a·t), (2) scale correction (ΔPs, determined by linear interpolation from certified correction table), and (3) supplemental correction (ΔPd) to compensate for long-term aneroid cell creep. Users must maintain physical calibration certificates and apply corrections prior to data entry into LIMS or statistical analysis platforms. For audit readiness, laboratories should retain dated records of each correction application alongside raw readings.
Applications
- Meteorological surface observation networks requiring redundant, battery-independent pressure references
- Airfield elevation verification and altimeter setting validation in general aviation pre-flight checks
- Geodetic leveling and topographic surveying where barometric height interpolation is employed
- Environmental monitoring in agricultural extension services tracking synoptic-scale weather patterns
- Industrial hygiene assessments involving ventilation system static pressure baseline verification
- Academic physics and earth science laboratories demonstrating fundamental gas laws and atmospheric thermodynamics
FAQ
What is the recommended recalibration interval for the DYM3?
Supplemental correction values (ΔPd) are valid for six months from the date of verification. After this period, re-certification against a national standard barometer is required to maintain measurement integrity.
Can the DYM3 be used at high altitudes or extreme temperatures?
It operates reliably between −10 °C and +40 °C and measures down to 800 hPa — equivalent to approximately 2,000 m above sea level. Operation beyond these limits may exceed mechanical design tolerances and invalidate stated accuracy.
Why must the instrument be tapped before reading?
Tapping releases stiction in the gear train and pointer pivot, ensuring the pointer settles at the true equilibrium position rather than a friction-locked false reading.
Is temperature correction mandatory for every measurement?
Yes — the temperature coefficient (a) is unique to each unit and provided on its calibration certificate. Omitting temperature correction introduces systematic bias exceeding ±2.0 hPa, violating stated accuracy specifications.
Does the DYM3 comply with FDA 21 CFR Part 11 or EU Annex 11?
No — as an analog, non-electronic device without electronic records or audit trails, it falls outside the scope of electronic data integrity regulations. Its use remains fully acceptable in GxP environments where manual, paper-based records are permitted and validated.
