1 Overview

DDS-11AType conductivity meter (hereinafter referred to as the instrument) is a laboratory conductivity measurement instrument widely used in industries such as petrochemicals, biomedicine, sewage treatment, environmental monitoring, mining and smelting, as well as in colleges, universities and research institutions. If equipped with appropriate constant conductivity electrodes, it can also be used to measure the conductivity of pure or ultrapure water in electronic semiconductors, nuclear energy industry, and power plants.

The main features of the instrument are:

◆ Five range, automatic switching, automatic carry display, simple operation, high measurement accuracy.

◆ Manually set and display the temperature, and automatically compensate for the temperature of the solution.

◆ adoptLCD digital display, temperature and measurement values are displayed simultaneously, with a beautiful appearance and clear display. The instrument is equipped with a multifunctional electrode bracket for easier operation.

◆ Four electrode constants(0.01，0.1，1.0，10)Optional, it can measure the conductivity of both general aqueous solutions and high-purity water.

◆ Having conductivity andTDSConversion function.

2 Main technical performance of the instrument

2.1 The measurement range of the instrument is(0~2×10⁵MS•cm^-1)The instrument is divided into five ranges, with automatic switching between each range. The five ranges are as follows:

0.000～1.999MS/cm；

0.00～19.99MS/cm；

20.0～199.9MS/cm；

200～1999MS/cm；

2.00～20.0mS/cm;

20.0～200.0mS/cmThe distribution pole constant is10The electrode

TDSMeasurement range:（0-10.0）g/L

0.000-19.99mg/L

20.0-199.9mg/L

200-1999mg/L

2000-10.0 g/l

2.2 Basic error of electronic unit: ±2.0%(FS)±lOne word.

2.2 Basic error of the instrument:2.5%(FS)±1One word.

2.3 Temperature compensation error of electronic unit: ±1.0%(FS)±lOne word.

2.4 Temperature compensation range:(5～50)℃,reference temperature25℃。

Temperature display range:0～100℃

Medium temperature:5～50℃

2.5 Supporting electrode:DJS-1Type plastic electrode Electrode constant:1.0 cm^-1

2.7 Overall dimensions 1×b×h，240×180×70 mm：

2.8 heavy Quantity:1kg.

2.9 Normal usage conditions:

a)Ambient temperature(5~50)℃；

b)Relative humidity: not greater than85％；

c)Power supply:DC9V 400mA (Internally positive and externally negative)

d)No significant vibration;

e)There is no external magnetic field interference except for the Earth's magnetic field.

Instrument supporting list:

The measurement range of the instrument is(0~2×10⁵MS•cm^-1)The instrument is divided into five ranges, with automatic switching between each range. The five ranges are as follows:

0.000～1.999MS/cm；

0.00～19.99MS/cm；

20.0～199.9MS/cm；

200～1999MS/cm；

2.00～20.0mS/cm;

20.0～200.0mS/cmThe distribution pole constant is10The electrode

TDSMeasurement range:（0-10.0）g/L

0.000-19.99mg/L

20.0-199.9mg/L

200-1999mg/L

2000-10.0 g/l