Vehicle Testing & Diagnostics
NHT-6 Diesel Smoke Opacimeter
Model: NHT-6
Split-unit diesel smoke opacimeter measuring opacity from 0 to 99.99% and light absorption from 0 to 16.0 m⁻¹. NHT-6 provides free-acceleration and transient measurement, an LCD menu, a micro printer and an RS-232C interface.
Supplied by Guangzhou BAOHUA, a Guangzhou-based automotive workshop equipment supplier with business roots dating back to 1998.
- Separate control and measuring units
- Opacity 0–99.99% and absorption 0–16.0 m⁻¹
- Free-acceleration and transient measurement
- LCD with Chinese or English interactive menu
- Automatic zero reset and 10-minute warm-up
Final configuration, specifications, accessories, packaging, and delivery terms are confirmed in the quotation.
PRODUCT DETAILS
Features, construction, and applications
Review the available product detail images for the selected equipment.
TECHNICAL DATA
Specifications
Values below follow the supplied product listing. Confirm the final selected configuration before ordering.
Product specifications
| Opacity (N) range | 0–99.99% |
|---|---|
| Light absorption coefficient (k) range | 0–16.0 m⁻¹ |
| Engine-speed range | 300–9,999 rpm |
| Oil-temperature range | −50 to 120°C |
| Opacity indication error | ±2.0% |
| Opacity resolution | 0.1% |
| Uncorrected opacity accuracy | ±2.0% absolute error |
| Engine-speed accuracy (piezoelectric) | ±1.0% relative error |
| Oil-temperature accuracy | ±2°C absolute error |
| Effective optical path | 215 mm |
| Equivalent optical path | 430 mm |
| Sampling probe length | 2.5 m |
| Power consumption | 200 W |
| Power supply | AC 220 V ±10%, 50 Hz ±1 Hz |
| Warm-up time | 10 minutes |
| Control unit weight | 5.5 kg, including printer |
| Measuring unit weight | 6.5 kg |
| Control unit dimensions (W × D × H) | 370 × 280 × 220 mm |
| Measuring unit dimensions (W × D × H) | 410 × 215 × 360 mm, including supports |
| Digital interface | RS-232C |
| Recording | Micro printer |
Installation requirements
Provide AC 220 V ±10%, 50 Hz ±1 Hz, reliable grounding and a stable support for both units. Plan sampling access, cable routing, ventilation and operator clearance. Follow the supplied instructions for warm-up, zero checks, chamber cleaning and vehicle operation. Confirm the sampling probe, connecting cables, RPM pickup, oil-temperature probe, printer paper and calibration-check materials in the quotation.
Product overview
Diesel smoke measurement with two separate units
NHT-6 is a partial-flow opacimeter for diesel-powered vehicles. The control unit and measuring unit are separate, allowing the operator to read the LCD while positioning the measuring unit for sampling. It reports smoke opacity (N) and light absorption coefficient (k).
Opacity, absorption, speed and temperature
The confirmed brochure lists opacity from 0 to 99.99%, light absorption from 0 to 16.0 m⁻¹, engine speed from 300 to 9,999 rpm and oil temperature from −50 to 120°C. Opacity resolution is 0.1%. Confirm the required RPM pickup and oil-temperature sensor package in the quotation.
Free-acceleration and transient measurements
The instrument supports free-acceleration testing and transient measurement, with automatic processing and display of results. The brochure specifies a 10-minute warm-up and automatic zero reset. Follow the supplied procedure for instrument preparation and vehicle operation.
Optical chamber and sampling arrangement
The measuring unit uses partial-flow technology, an air-curtain arrangement and sample-cell temperature control. These features are intended to reduce optical contamination and condensation effects. The stated effective optical path is 215 mm, the equivalent optical path is 430 mm and sampling probe length is 2.5 m. Routine cleaning and checks remain necessary.
Results and communication
The confirmed brochure configuration includes a micro printer and RS-232C serial interface. Request the communication requirements and available record format before connecting to existing workshop software. Compatibility with a specific system requires confirmation.
Power, dimensions and quotation preparation
Provide AC 220 V ±10% at 50 Hz ±1 Hz for the listed 200 W instrument. The control unit measures 370 × 280 × 220 mm (W × D × H) and weighs 5.5 kg including the printer. The measuring unit measures 410 × 215 × 360 mm including supports and weighs 6.5 kg. These are equipment dimensions and weights; request packing data separately.
One-stop equipment sourcing for a new workshop
Send BAOHUA your diesel-testing requirements and complete workshop equipment and tool list. We can help coordinate equipment selection and consolidated shipping. Confirm the instrument package, accessory list, packing data, destination and shipment arrangements in the quotation.
Common purchasing questions
**Does NHT-6 measure five exhaust-gas concentrations?** NHT-6 measures diesel smoke opacity and light absorption. For HC, CO, CO₂, O₂ and NO concentrations, evaluate a separate gas analyzer against its own fuel and measurement specifications.
**Is a printer included?** The user-confirmed brochure configuration lists a micro printer. Confirm the supplied printer and consumables on the order.
**What does the measuring-unit size include?** The stated 410 × 215 × 360 mm dimensions include its supports. Allow separate space for sampling, the control unit, cable routing and operator access.
**Is approval for a local statutory inspection programme included?** Request the documentation required by the destination inspection authority. This product listing does not establish local approval.
Product imagery
Workshop and technical images are illustrative renderings based on the supplied NHT-6 product reference. Confirm the ordered finish and included accessories in the quotation.
MODEL SELECTION
How to choose this equipment
Selection guidance
- What measurement is needed?
- Choose an opacimeter for diesel smoke opacity and light absorption. Identify the vehicles and test procedure before ordering.
- How much space is needed?
- Review both unit dimensions separately and provide sampling access, stable supports, ventilation, cable routing and safe operator clearance.
- Which sensors are required?
- Confirm the engine-speed pickup type, oil-temperature probe, sampling probe and all connecting leads in the supplied package.
- Will it connect to inspection software?
- The brochure lists RS-232C. Provide the required data protocol and software details for compatibility confirmation.
Compared with related models
Compare diesel smoke opacity, light absorption range, optical-path specification, sampling arrangement, RPM pickup, oil-temperature probe, printer and interface when selecting an opacimeter. NHT-6 is a split-unit smoke instrument; a five-gas analyzer such as NHA-506EN reports different measurement quantities and should be selected against its own fuel and gas-channel requirements. Confirm any destination inspection-programme approval separately.
BUYER SEARCH GUIDE
Diesel smoke opacimeter purchasing guide
For diesel-vehicle smoke measurement during workshop and fleet maintenance, including free-acceleration and transient measurements according to the supplied procedure. Confirm local inspection requirements separately.
Common sourcing language
Importers, distributors, and workshop buyers may describe NHT-6 Diesel Smoke Opacimeter using these related terms:
- NHT-6 diesel smoke opacimeter
- diesel vehicle opacity meter
- partial-flow smoke tester
- diesel light absorption meter
What to compare before ordering
Compare opacity and light absorption ranges, optical paths, sampling arrangement, RPM pickup, oil-temperature probe, printer and AC power. Confirm the required accessories and communication protocol in the quotation.
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