Explosion proof dual parameter intelligent industrial concentration transmitter

product overview

Welcome to choose our NDG series multi parameter intelligent transmitter developed by our company. The NDG series acid, alkali, and salt concentration transmitter is a process instrument that uses non-contact electrodes to measure the conductivity of a solution to determine concentration. It can continuously detect the content of acid, alkali, and salt in aqueous solutions during industrial production processes online, avoiding measurement difficulties caused by viscosity, scaling, corrosion, and other reasons. Mainly used in industrial production processes such as boiler feedwater treatment, chemical solution preparation, monitoring of bottle and tank cleaning processes, and environmental protection. This series of transmitters adopts high-precision AD conversion and single-chip microprocessor technology, integrating various functions such as conductivity display, transmission, and automatic temperature compensation.

Basic functions:

Fully intelligent: using high-precision AD conversion and single-chip microcomputer processing technology, it completes various functions such as measurement of acid and alkali salt solutions, temperature measurement, automatic temperature compensation, and automatic range conversion. Simultaneous display of multiple parameters: Simultaneously display conductivity/concentration of acid, alkali, and salt solutions, as well as temperature.

Automatic temperature compensation: Convert the concentration of acid, alkali, and salt in the solution directly to the standard value at 25 ℃, and the changes in the solution are clear at a glance.

Strong anti-interference ability: The current output adopts electromagnetic isolation technology, which has strong anti-interference ability to achieve long-distance transmission. Has good electromagnetic compatibility.

4-20mA output/RS485 communication interface optional: convenient for application requirements in different working conditions and different sites.

Product parameters:

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.