VIKING255 | 256 | 257 — Table Top Laboratory Turbidity Meters
VIKING250 laboratory turbidity meter
OVERVIEW
The VIKING250 series comprises three benchtop turbidity meters: VIKING255 (drinking water), VIKING256 (high precision) and VIKING257 (smart). All feature a 4.3″ colour LCD, 1–6 point calibration with Formazin standards, and storage of up to 2000 calibration curves (GLP‑compliant).
The optical system uses an 850 nm LED (100 000 h lifetime), two photodiodes for reference and 90° scattered light, and a narrowband interference filter. Data can be transferred via USB or RS‑232. Units selectable: NTU, FNU, EBC.
Professional laboratory turbidity meters with 4.3″ colour display — intelligent operating system, 1–6 point calibration, and GLP data logging. The VIKING250 series combines high precision (up to 0.001 NTU resolution), 2000 data sets and flexible connectivity (USB/RS‑232) for drinking water, environmental and industrial analysis.
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COLO.SCIENCE KNOWLEDGE
Turbidity measurement – theory and practice
Explore COLO.Science articles on turbidity theory, calibration with Formazin, GLP‑compliant curve storage and best practices for drinking water and wastewater analysis.
Product Overview
VIKING255 / 256 / 257 are benchtop turbidity meters designed for precise and traceable turbidity measurement. Each model offers different range/resolution combinations to suit drinking water, high‑precision or wide‑range applications. The 4.3″ colour LCD provides clear navigation, while the dual‑photodiode optical system guarantees long‑term stability.
Configuration notice — delivery depends on selected options
Turbidity meters may be delivered in different configurations depending on the application and selected accessories. The official PDF technical specification defines the exact configuration, included components and available options for each model/variant. Content shown on this website is provided for general informational purposes only and may not represent the final delivered configuration. Specifications may change without notice.
Key Features
1–6 Point Calibration
2000 Calibration Curves
USB & RS-232
Dual Photodiodes
850 nm LED
NTU / FNU / EBC
GLP Data Storage
Formazin Standards
Optics
Nephelometric 90° detection & precision optical system
Dual‑photodiode design
Reference and 90° scattered light detectors ensure high accuracy and stability. Cold light source (850 nm LED) with 100 000 h lifetime.
Flexible calibration
1–6 points with Formazin or zero water. User‑defined piecewise curves and coefficient input for different concentration ranges.
GLP‑compliant data
2000 stored curves with user ID, date/time, calibration points. Transfer via USB or RS‑232 to PC.
VIKING255 – Drinking water
- Range: 0–100 NTU
- Readout NTU: 0.001 NTU
- Accuracy: ±2% + 0.01 NTU
- Resolution: 0–10 NTU → 0.001 NTU; 0–100 NTU → 0.1 NTU
- Ideal for drinking water & low‑turbidity samples
VIKING256 – High precision
- Range: 0–1000 NTU
- Readout NTU: 0.01 NTU
- Accuracy: ±2% + 0.01 NTU
- Ranges: 0–20/0.01, 20–200/0.1, 200–1000/1 NTU
- Wide range with fine resolution
VIKING257 – Smart
- Range: 0–1000 NTU
- Readout NTU: 0.001 / 0.01 NTU (auto)
- Accuracy: ±1% + 0.01 NTU
- Multi‑range: 0–10/0.001, 0–100/0.01, 0–1000/0.1 NTU
- Highest precision for variable samples
Technical Specifications – VIKING250 series
| Parameter | VIKING255 | VIKING256 | VIKING257 |
|---|---|---|---|
| Application | Drinking water turbidity | High precision turbidity | Smart turbidity |
| Measuring range | 0–100 NTU | 0–1000 NTU | 0–1000 NTU |
| Readout NTU (basic) | 0.001 NTU | 0.01 NTU | 0.001 / 0.01 NTU |
| Range / resolution details | 0–10 / 0.001 NTU 0–100 / 0.1 NTU |
0–20 / 0.01 NTU 20–200 / 0.1 NTU 200–1000 / 1 NTU |
0–10 / 0.001 NTU 0–100 / 0.01 NTU 0–1000 / 0.1 NTU |
| Accuracy | ±2% + 0.01 NTU | ±2% + 0.01 NTU | ±1% + 0.01 NTU |
| Repeatability* | ±1% of reading or ±0.01 NTU, whichever greater (ref. conditions) | ||
| Light source | LED 850 nm, cold light, narrowband interference, 100 000 h lifetime | ||
| Detector | 2 photodiodes (90° scattered light, nephelometric principle) | ||
| Calibration | 1–6 points (Formazin / zero water), user‑defined curves | ||
| Data storage | 2000 calibration curves / measurement sets | ||
| Data transfer | USB 2.0, RS‑232 | ||
| Display | 4.3″ colour LCD, backlit, user‑friendly interface | ||
| Units | NTU, FNU, EBC (selectable) | ||
| Ambient temperature | 5 °C … 40 °C | ||
| Power supply | 220 V ±10% 50 Hz | ||
| Dimensions / weight | approx. 3.5 kg (net), 4.5 kg (gross) | ||
Note: *Under stable reference conditions. For the complete specification table, please refer to the VIKING250 series catalog (PDF).
Standard Delivery
- Calibration standard set (0.02 NTU, 10 NTU, 1000 NTU)
- Power cord (220 V / 50 Hz)
- Instruction manual
- Dust protection cover
- Cuvette set (5 high‑precision glass cuvettes)
- USB cable (RS‑232 optional)
Optional: additional calibration standards, tungsten lamp, Bluetooth module, different calibration sets. Exact kit contents may vary by region; please refer to the current catalog and quotation for final configuration.
VIKING250 series – model comparison
Choose the right turbidity meter for your application: drinking water, high precision or smart multi‑range.
| Model | Range (NTU) | Best resolution | Accuracy | Typical use |
|---|---|---|---|---|
| VIKING255 | 0–100 | 0.001 NTU | ±2%+0.01 NTU | Drinking water, low turbidity |
| VIKING256 | 0–1000 | 0.01 NTU | ±2%+0.01 NTU | High precision, wide range |
| VIKING257 | 0–1000 | 0.001 / 0.01 NTU | ±1%+0.01 NTU | Smart, variable samples |
VIKING250 series — Laboratory Turbidity Meters
A versatile family of turbidity meters with 4.3″ colour display, 1–6 point calibration, 2000 GLP curves and robust optical design — supported by COLO.Science.
COLO.Science · Practical and robust equipment for everyday laboratory workflows.
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