Products Description
The online conductivity meter (hereinafter referred to as the instrument) is a water quality online monitoring instrument with a microprocessor. This instrument is equipped with conductivity electrodes of different types and constants for continuous monitoring and control of the conductivity and temperature values of aqueous solutions. Widely used in power plants, petrochemicals, metallurgy, paper industry, environmental water treatment, light industry electronics and other fields. Monitoring and control of raw and produced water quality in water production equipment such as power plant cooling water, make-up water, saturated water, condensate and boiler water, ion exchange, reverse osmosis EDL, seawater distillation, etc.
The instrument adopts an LCD display screen; Intelligent Chinese menu operation; Has current or voltage output, freely adjustable measurement range, high and low limit alarm prompts, two sets of relay control switches, and adjustable hysteresis range; Automatic or manual temperature compensation;
According to user needs, conductivity electrodes can be installed in various forms such as flow type, pipeline type, sinking type, and flange type.
Structural Features
The entire measurement system mainly consists of two parts: DDG1001 type instrument (secondary meter) and conductivity electrode (primary meter). The electrode contacts the measured solution, and the instrument displays the conductivity value, temperature, and working status of the measured aqueous solution.
Working Principle
Measurement principle: In order to avoid electrode polarization, the instrument generates a highly stable sine wave signal added to the electrode. The current flowing through the electrode is proportional to the conductivity of the measured solution. The instrument converts the current from a high impedance operational amplifier into a voltage signal, which is amplified, phase sensitive detected, and filtered by a programmable signal to obtain a potential signal reflecting the conductivity; The microprocessor alternately samples the temperature signal and conductivity signal through switch switching, and after calculation and temperature compensation, obtains the conductivity value and temperature value of the measured solution at 25 ℃.
Temperature compensation principle: The conductivity of electrolyte solution is affected by temperature changes and requires temperature compensation. The temperature coefficient of a weak aqueous solution is 2.00% ℃, and the higher the concentration, the smaller the temperature coefficient. The temperature coefficient for solutions with lower concentrations (1 µ S · cm-1) is not set at 2.00% ℃, but is set by the user, ranging from 0.00 to 9.99%.
Technical Parameters
| Conductivity | 0-20 µ S · cm-1 (K=0.01); 20～200µS·cm-1 (K=0.1); 200µS·cm-1～4mS·cm-1 (K=1.0); 4～20.0mS·cm-1;(K=10.0) 20～100.0mS·cm-1; (K=30.0) | Two sets of relay control contacts | 3A 240VAC, 6A 28VDC or 120VAC; |
| Temperature | -5~110 ℃; | Power supply | 220VAC ± 10%, 50 ± 1Hz, power ≤ 3W; 24VDC, power ≤ 1W (to be predetermined); 12VDC, power ≤ 1W (to be predetermined); |
| Resolution | Conductivity 0.01 µ S · cm-1; 0.01 mS·cm-1 Temperature 0.1 ℃; | External dimensions | 96 x 96 x 130mm; |
| Basic instrument error | conductivity ± 1.0% F · S ± 1 word, temperature ± 0.5 ℃; | Installation method | Disk mounted (embedded); |
| Electronic unit automatic or manual temperature compensation range | 0-110 ℃ (reference temperature 25 ℃); | Opening size | 91 x 91mm; |
| Automatic temperature compensation error of electronic unit | ± 0.5% F · S; | Wall mounted | Waterproof wall mounted box size 300 (height) x 200 (width) x 167 (depth) mm; |
| Electronic unit stability | ± 0.2% F · S ± 1 word/24 hours; | Instrument weight | 0.6kg; |
| Repeatability error of electronic unit | ≤ 0.2% F · S ± 1 word; | Environmental temperature | -10~60 ℃; |
| Electronic unit alarm error | ± 1% F · S; | Relative humidity | not more than 90%; |
| Output current error of electronic unit | ± 1% F · S; | There is no strong magnetic field interference around except for the Earth's magnetic field | |
| Signal output | 0-10mA (load resistance ＜ 1.5K Ω); 4-20mA (load resistance ＜ 750 Ω); 0-5V, 0-10V optional (to be reserved); |
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Electrode Installation
Schematic diagram of suitable electrode types for installing the base
③ Flange type: customized flange installation according to user needs.
④ Input type: Directly insert the electrodes into the water pool, tank, or tower, and waterproof the electrode cables or install them with protective sleeves.
⑤ Other methods: If a suitable installation method is not found above, please contact the manufacturer to customize a special installation method.
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