HM-SXT2 Turbidity Meter

I. Product Description

Turbidity is a key water quality parameter that indicates the concentration of suspended particulate matter in water, directly affecting both the sensory characteristics and safety of the water supply. The HM-SXT2 turbidity meter employs an 860nm LED light source with scattered light measurement and automatic scattered/transmitted light switching, providing accurate turbidity determination across a wide range of 0–4000 NTU. The instrument integrates precision optics with intelligent technology, offering features such as one-key calibration, fast response, large display, and data storage. With a lightweight and portable housing, long battery life, and IP65 ingress protection, it is well-suited for demanding field environments. Primary applications include drinking water treatment, environmental monitoring, wastewater treatment, food and beverage production, and aquaculture, delivering efficient and professional on-site water quality testing solutions.

II. Detection Principle

The scattered light detection method directs a stable light beam through a sample cell containing the test specimen. A sensor positioned at a 90-degree angle to the incident light measures the intensity of scattered light. Within a certain concentration range, the intensity of scattered light is proportional to the turbidity of the sample.

When the sample turbidity exceeds the effective range of the scattered light method, the instrument automatically switches to transmitted light measurement. In this mode, the sensor detects the attenuation of the light beam passing directly through the sample, which is proportional to the concentration of suspended particles at higher turbidity levels. This automatic switching between scattered and transmitted light methods ensures measurement accuracy across the entire 0–4000 NTU range without manual intervention.

III. Applicable Standards

1. HJ 1075-2019 Water Quality — Determination of Turbidity — Turbidimetric Method

2. ISO 7027 Water Quality — Determination of Turbidity

3. JJG 880-2006 Turbidity Meters

4. GB 5749 Standards for Drinking Water Quality

5. CJ 3020 Water Quality Standard for Drinking Water Sources

6. GB/T 14848 Quality Standard for Ground Water

IV. Scope of Application

The HM-SXT2 turbidity meter is applicable to the following areas:

1. Environmental monitoring: assessing turbidity in rivers, lakes, and groundwater bodies.

2. Drinking water industry: routine inspection of treatment process (from raw water to filtered water) and distribution network quality.

3. Wastewater treatment plants and industrial discharge facilities: monitoring turbidity at inlet, outlet, and intermediate treatment stages.

4. Aquaculture: maintaining environmental health of aquaculture water bodies.

5. Food and beverage, pharmaceutical industries: monitoring the quality of production water and cleaning water.

V. Product Features

1. Android Operating System: Intuitive graphical interface with user-friendly operation.

2. 4.3-Inch HD Touchscreen: Visual graphical operation pages significantly improve operational efficiency.

3. High-Reliability LED Light Source: Imported LED with no warm-up requirement and long-term stable performance.

4. Dual Optical Modes with Auto-Switching: Automatically switches between scattered light and transmitted light measurement based on sample turbidity, ensuring accuracy across the full 0–4000 NTU range.

5. Large Photocell: 10 × 10 mm photocell provides high sensitivity and low detection limit.

6. 16 GB Internal Storage: Stores over 10,000 measurement records; optional Bluetooth printer for on-site result printing.

7. Wi-Fi, Bluetooth, and USB Connectivity: Direct PC connection for fast batch data upload.

8. Water-Resistant Housing: IP65-rated external housing; detection chamber resists liquid ingress up to 0.5 mL.

9. USB-C Power with BC2.1 Protocol: 5V 2.1A USB-C charging, compatible with third-party phone chargers, cables, and power banks; intelligent lithium battery charging management supports continuous mains-powered operation.

10. Averaged Measurement with Auto Range Switching: Performs averaged readings and automatically selects the appropriate measurement range.

11. Multiple Display Units: Default display unit is NTU; other units including FAU, FNU, FTU, EBC, ASBC, and mg/L can be user-configured.

12. Multi-Point Calibration: Supports continuous multi-point turbidity calibration, zero-point calibration, and built-in standard references.

13. Bilingual Operation: Chinese/English dual-language operating system.

VI. Technical Specifications

Measurement Parameters

Accuracy & Stability

Environmental & Physical

VII. Frequently Asked Questions (FAQ)

Q1: What is the difference between scattered light and transmitted light measurement on the HM-SXT2?

A: The HM-SXT2 uses two complementary optical methods. Scattered light (nephelometric) measurement detects light scattered at 90° from the incident beam, which is sensitive at low turbidity levels. Transmitted light measurement detects the attenuation of the beam passing directly through the sample, which provides more reliable readings at high turbidity levels. The instrument automatically switches between these two modes based on the sample turbidity, ensuring measurement accuracy across the full 0–4000 NTU range.

Q2: How does the HM-SXT2 differ from the HM-SXT1 turbidity meter?

A: The HM-SXT2 offers two key advantages over the HM-SXT1. First, the SXT2 supports both scattered light and transmitted light measurement with automatic mode switching, while the SXT1 uses scattered light measurement only. Second, the SXT2 extends the measurement range to 4000 NTU, compared to the SXT1's range of 2000 NTU. Both instruments share the same 860nm LED light source, 0.001 NTU resolution, and IP65 protection rating.

Q3: Can the HM-SXT2 be used for drinking water compliance testing?

A: Yes. The HM-SXT2 complies with ISO 7027 and HJ 1075-2019 measurement standards, which are recognized for drinking water turbidity determination. Its 0.001 NTU resolution and repeatability of ≤0.5% make it suitable for monitoring turbidity levels in drinking water treatment processes, from source water to distribution system points of compliance.

Q4: How long does the battery last during field operation?

A: The HM-SXT2 is equipped with an 8000 mAh lithium battery. Actual operating time depends on measurement frequency and display brightness settings, but the large battery capacity is designed to support a full day of field testing on a single charge. Charging is via USB-C 5V 2.1A with BC2.1 protocol support, allowing the use of standard phone chargers and power banks for convenient field recharging.

Q5: What calibration options does the HM-SXT2 support?

A: The instrument supports continuous multi-point turbidity calibration using standard turbidity solutions, zero-point calibration for baseline correction, and built-in standard references for quick verification. The one-key calibration feature simplifies the calibration process during field operations, and the instrument stores calibration data for traceability.

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