Product Overview

The HT-ASV series heavy metal online monitoring instrument uses pre treated water samples that are digested at high temperature and high pressure, mixed with electrolyte in a detection tank, and then a reduction potential is applied to the electrode to enrich the metal ions to be tested in the mixed solution on the working electrode. The applied potential is then continuously changed in a step pulse manner to dissolve the metal elements enriched on the working electrode, and the current signal intensity during dissolution is detected. The concentration of the tested component is calculated based on the peak intensity of the dissolution current signal.

Instrument Principle
This method first applies a constant reduction potential to the working electrode, and the analyzed metal ions in the solution are reduced to metals and enriched on the electrode. Then, the potential is increased at a constant rate to the working electrode, and the enriched metals will dissolve out on the electrode during this process. The concentration of heavy metal ions can be accurately determined by the voltammetry curve. This testing method has been listed as a standard testing method by authoritative agencies such as the US EPA. The specific instruments in this series are as follows:
HT-ASV(Pb)
HT-ASV(Cd)
HT-ASV(Cu)
HT-ASV(Zn)

HT-ASV（As）
HT-ASV(Hg)
Instrument Features

Electrochemical method has a low detection limit and is not affected by the color, turbidity, and other metal ions of water samples. Compared with colorimetric instruments, it is more suitable for monitoring surface water with low heavy metal content in water conservancy, water affairs, environmental protection and other departments.

2. Imported metering pumps, valves, and other hardware are used to ensure long instrument lifespan, minimal maintenance, low reagent usage, and low operating costs.

The instrument is controlled by industrial grade PLC and runs stably; 7-inch color screen, step-by-step touch operation, intuitive display of analysis spectra and measurement results, no need for professional technicians.

4. Equipped with a pre-treatment system, it can adapt to various water quality, automatically clean, sample, add standards, and measure. It achieves intelligent 24-hour unmanned operation and can issue over limit alarms, saving time, effort, and cost.

Technical Specifications

Detection method: voltammetric dissolution method

Measurement range: Lead: 0.1 μ g~1.000mg/L

镉： 0.1 μg ～1.000 mg/L

Copper: 0.5 μ g~1.000 mg/L

Zinc: 1.0 μg to 1,000 mg/L

汞： 0.1 μg ～1.000 mg/L

Arsenic: 1.0 μg to 1,000 mg/L

Resolution: 0.1 μ g/L

Repeatability: ≤ 10%

Accuracy: ± 10% F.S

Zero drift: ± 5% F.S

Range drift: ± 5% F.S

Measurement cycle: set arbitrarily for the whole hour, can be manually or automatically measured

Screen display: 7-inch color display screen, full Chinese display

Operation: Through PLC control and touch screen step-by-step operation

Signal output: 4-20 mA

Digital output: RS485/RS232, MODBUS-RTU protocol
Application field
Online monitoring of pollution source wastewater discharge
Online monitoring of municipal sewage
Online monitoring of surface water
Online monitoring of drinking water sources