NDA series concentration analyzer

Product Features

Supporting DMN200 series analyzer

Adopting powerful and stable industrial grade microprocessors

96x96， Can be installed in different environmental conditions, such as pipeline installation, wall hanging, meter box installation, disc installation, etc

Split installation, more flexible and convenient

Large LCD display screen, background light makes it easier to read display values in dark environments

Automatic selection of temperature compensation function and periodic correction warning

It can be widely used in water treatment, chemical industry processes, papermaking industry, and food industry.

Principle of electrodeless and electromagnetic concentration measurement:

In the measured solution with higher conductivity, an alternating voltage is input to the transmitting coil, and due to electromagnetic induction, an induced current is generated in the solution. The current passes through the receiving coil, causing it to generate an induced potential that is proportional to the conductivity of the solution. Based on the relationship between the conductivity and concentration of a solution, its concentration value can be determined.

Installation diagram of concentration probe

1、 Wiring instructions

Hosman plug wiring instructions

Please wire the Hosman plug according to the following diagram

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1. Unscrew the screw and pull out the plug upwards

2. Pry open the plug and follow the wiring diagram to connect the wires.

Aluminum alloy junction box wiring instructions???

1. Wiring: Connect the circuit according to the requirements of Figure 2 or Figure 3, and after powering on for five minutes, it can be verified.

2. Verification: Taking the two-wire 0-8% sulfuric acid concentration transmitter as an example, connect it according to Figure 4.

Figure 4: Wiring diagram for transmitter inspection

2、 Transmitter inspection

Prepare five standard sulfuric acid solutions: 0.01%, 2%, 4%, 6%, and 8%. First, calibrate the 8mA and 16mA points using 2% and 6% solutions, and adjust them accordingly. Then, calibrate the 4mA, 12mA, and 20mA points using 0.01%, 4%, and 8% solutions. Calculate the maximum difference and fine tune the "zero" and "full" potentiometers to minimize the error.

When calibrating, it should be noted that after calibrating with a solution of one concentration, when recalibrating with another solution, it is necessary to clean with a solution of the same concentration before recalibrating to avoid diluting or concentrating the calibration solution and increasing the calibration error.

Due to the special conductivity relationship of acid-base solutions, when there is no solution in the conductivity cell, the output of the transmitter is not exactly at zero, but below zero (see Figure 5).

Figure 5 Relationship curve between sulfuric acid concentration and conductivity

Attention: As the transmitter has been calibrated according to the measured medium and concentration provided by the user before leaving the factory, it is generally not advisable to turn the potentiometer.

3、 Put into operation and use

After the transmitter is calibrated, it can be installed according to the process requirements. The flange surface should be padded and tightened, but excessive force should not be applied. After wiring, carefully check for errors before turning on the power for operation.

The transmitter will not experience any malfunctions during operation. The conductivity pool has a flow hole of Φ 14 and a large diameter of Φ 47, with a straight and smooth inner wall that is not easily attached to objects and is easy to clean. A relatively clean acid-base solution can be used for one or two years without causing significant errors; When measuring media with excessive scaling and sedimentation, the cleaning cycle should be appropriately shortened. If there is scaling in the NaOH solution, it can be cleaned with 5% HCl.