DDSJ-308A Conductivity Meter

Product Introduction

The DDSJ-308A Conductivity Meter is a digital water quality analyzer designed to measure conductivity, total dissolved solids (TDS), salinity, and temperature. Featuring a large dual-digit LCD with blue backlight, it displays conductivity and temperature readings simultaneously for convenient monitoring.

The instrument offers automatic temperature compensation, automatic calibration, and automatic range switching to simplify routine measurements. It supports multiple electrode constants, allowing users to select a suitable conductivity electrode for different sample types, including ultrapure water measurement when equipped with a K = 0.01 cm⁻¹ titanium alloy electrode and a sealed measuring cell.

With internal storage for up to 50 measurement records, an RS-232 interface, and compatibility with a TP-16 printer and PC data software, the DDSJ-308A is suitable for laboratory analysis, water quality testing, and industrial process monitoring.

Performance Features

•  Multi-parameter measurement: Measures conductivity, TDS, salinity, and temperature.

•  Dual-value display: Large LCD with blue backlight displays conductivity and temperature readings simultaneously.

•  Automatic temperature compensation: Compensates for temperature effects within the specified range of 0–50°C.

• Automatic range switching: Automatically selects the appropriate measurement range for conductivity and TDS.

•  Automatic calibration: Simplifies instrument calibration and routine operation.

•  Flexible electrode compatibility: Supports electrode constants of 0.01, 0.1, 1.0, and 10.0 cm⁻¹.

•  Ultrapure water measurement: Supports a K = 0.01 cm⁻¹ titanium alloy electrode and sealed measuring cell for ultrapure water applications.

•  Data storage: Stores up to 50 sets of measurement results, with options to review, delete, and print records.

•  External connectivity: RS-232 interface supports connection to a compatible TP-16 printer or PC data software.

•  Adjustable measurement settings: Allows users to set the electrode constant and TDS conversion coefficient.

• Power interruption protection: Helps protect measurement data during power interruptions.

Working Principle

The DDSJ-308A measures electrical conductivity by detecting the electrical conductance of a solution between two electrodes. The conductivity value reflects the concentration and mobility of dissolved ions in the sample.

The instrument applies an electrical signal to the conductivity electrode and measures the resulting electrical response. It then calculates the conductivity based on the measured signal and the configured electrode constant.

TDS is calculated from conductivity using a user-adjustable conversion coefficient. Salinity is determined through the instrument's salinity measurement function, while the temperature sensor provides the temperature reading.

Automatic temperature compensation adjusts conductivity readings according to temperature changes within the specified compensation range. Automatic range switching selects an appropriate measurement range to simplify operation across samples with different conductivity levels.

Technical Parameters

Application Scenarios

The DDSJ-308A conductivity meter is suitable for conductivity and water quality analysis in a variety of applications:

•  Drinking Water Testing: Measurement of conductivity, TDS, and salinity-related parameters in water samples.

•  Ultrapure Water Analysis: Conductivity measurement using a compatible K = 0.01 cm⁻¹ titanium alloy electrode and sealed measuring cell.

•  Laboratory Water Analysis: Routine testing of conductivity and dissolved solids in prepared samples.

•  Industrial Water Monitoring: Monitoring water quality in production processes, cooling systems, and water treatment facilities.

•  Environmental Monitoring: Conductivity and salinity analysis of surface water, groundwater, and wastewater.

•  Educational and Research Laboratories: Electrochemical measurements and water chemistry experiments.

Product Comparison

The DDSJ-308A combines conductivity, TDS, and salinity measurement with automatic range switching and data communication.

The DDSJ-308A is a practical choice for laboratories and water treatment facilities that need multi-parameter water analysis, flexible electrode selection, and convenient data management.

Frequently Asked Questions (FAQ)

1. What parameters can the DDSJ-308A conductivity meter measure?

It measures electrical conductivity, total dissolved solids (TDS), salinity, and temperature.

2. What is the conductivity measurement range?

The instrument covers 0–1.999 × 10⁵ μS/cm across six automatically selected measurement ranges.

3. Can the DDSJ-308A measure TDS and salinity?

Yes. It measures TDS from 0 to 19,900 mg/L and salinity from 0.0 to 80 ppt (0.0–8.00%).

4. Does the instrument support automatic temperature compensation?

Yes. It provides automatic temperature compensation within a specified range of 0–50°C.

5. Which conductivity electrode constants are supported?

The DDSJ-308A supports electrode constants of 0.01, 0.1, 1.0, and 10.0 cm⁻¹, allowing selection according to the sample's conductivity range.

6. Can the DDSJ-308A measure ultrapure water?

Yes. It can be used for ultrapure water measurement when equipped with a K = 0.01 cm⁻¹ titanium alloy electrode and a compatible sealed measuring cell.

7. How many measurement records can the instrument store?

It can store up to 50 sets of measurement data. Users can review, delete, and print stored results.

8. Can the DDSJ-308A connect to a computer or printer?

Yes. Its RS-232 interface supports connection to a compatible PC data system or TP-16 printer.

9. What is the temperature compensation range?

The specified temperature compensation range is 0–50°C, while the instrument's temperature measurement range is -5 to 105°C.