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NI 9227
NI 9227

Nan Hua NHT6-100

Product Name
NHT-6 Diesel Exhaust Opacimeter / Smoke Meter.
Product Introduction
Intelligent instrument for measuring visible exhaust smoke and light absorption from compression-ignition diesel engines.
Category:
Description
Technical Specifications
Brand: Nan Hua Instruments
Model Family: NHT-6 / NHT6 series
Measuring Range Opacity N: 0 to 99.9 %
Light Absorption Coefficient k: 0 to 16.08 m⁻¹
Opacity Resolution: 0.01 %
Allowable Opacity Indication Error: ±2.0 %
Functional Features
Measures exhaust opacity.
Measures light absorption coefficient.
Free acceleration test support.
Transient exhaust measurement.
Separated measurement unit and control unit.
Air-curtain optical protection.
RS232 communication option.
Printer and RPM adapter options.
Performance Parameters
Display: opacity and absorption coefficient
Test Mode: free acceleration, transient measurement
Optical Protection: air-curtain technology
Data Storage: test records supported on NHT-6 units
Standards: ISO 11614, GB 3847-2018
Application Scenarios
Vehicle inspection stations.
Environmental protection testing.
Diesel engine factories.
Automotive OEM labs.
Workshop emission checks.
In-use vehicle smoke testing.
Structural Characteristics
Measurement probe / optical unit.
Separate control and display unit.
Sampling path exposed to exhaust plume.
Constant-temperature measurement chamber on related NHT-6 designs.
Control unit with menu interface.
Working Principle
Light passes through exhaust plume.
Smoke particles reduce transmitted light.
Instrument calculates opacity percentage.
Light absorption coefficient is derived from attenuation.
Result is displayed and stored for compliance reporting.
Installation Requirements
Place measurement unit in exhaust flow path.
Keep optical path free from condensation.
Use stable power supply.
Connect printer or RPM adapter as needed.
Install in ventilated, weather-protected area for indoor stations.
Usage Notes
Warm up instrument before testing.
Prevent water condensation in optical chamber.
Clean optical surfaces per manual.
Calibrate periodically.
Do not test outside specified exhaust temperature and flow limits.
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