I. Overview

EC3000The series two-wire industrial conductivity transmitter uses conductivity measurement methods to determine the conductivity values of general electrolyte solutions and gas aqueous solutions, indirectly detecting the concentration of liquids and gases. Widely used in industries such as refining, power generation, brewing, pharmaceuticals, chemical engineering, water treatment, semiconductor manufacturing, etc.

2、 Product Structure Diagram

The conductivity meter mainly consists of three parts: sensor, converter, and indicator, as shown in the following figure:

3、 Electrode

① There are four types of electrode constants: 0.01, 0.1, 1.0, and 10.

② Stainless steel composite electrode: structurally fastened, can be repeatedly cleaned, and has two electrode constants of 0.01 and 0.1.

Measurement range:

① Stainless steel measuring electrode: The maximum measurement range is 0-2000 μ s/cm, and the minimum measurement range is 0-0.1 μ s/cm

② Platinum electrode: The maximum measurement range is 0-300000 μ s/cm (note: the displayed meter shows as a percentage in this range, and the current 4-20 corresponds to 0-30000 μ s/cm). The minimum measurement range is 0-50 μ s/cm

Measurement of medium temperature: -10~120 ℃, special type: -10~150 ℃

◆ Allowable medium pressure: ＜ 0.6MPa, special 2.0MPa

◆ Intrinsic safety explosion-proof, explosion-proof gradeExia IIB T4；Explosion proof type, explosion-proof gradeExd IIB T4

Response time: about 0.4S, instantaneous output time is 0.2S when power is off

◆ Introduction of feeder cable: ordinary cable with a diameter greater than Φ 8mm, no shielding requirements, and a long-distance transmission distance of up to 1500 meters.

Output signal: 4-20mA

Accuracy: ± 0.5%

Drift: ≤ 0.5%/24 hours

◆ Load: 0-500 Ω

◆ Temperature compensation: automatic compensation method

◆ External power supply: 24V DC (22-32V)

◆ Shell protection level: IP66

◆ Allowable ambient temperature: -10~90 ℃

4、 Instrument selection

EC3000 series two-wire industrial conductivity transmitterSelection Table

Y

Integrated type (measurement, 4-20mA output integrated)

structural type

F

Split type (high impedance sensor, mV electrode signal output, matched controller on-site display)

G

Domestic conductivity electrode sensor

Electrode

U

Imported conductive electrode sensors from abroad

C

Insertion type M48 × 2 thread, insertion depth of 100, 150, 200mm (user reference)

Installation method

F

Submerged (installation height 0.6m-4m), flange or threaded installation, specify when ordering

S

Horizontal flow type (with matching horizontal flow pool) DN25, PN0.6 flange GB9119.2-88

T

User specific requirements

P

Ordinary industrial processes use 0-80 ℃

Application scenarios

J

Use 0-100 ℃ in high temperature and strong alkali environments

S

High temperature strong acid field suitable for 0-110 ℃

W

0-80 ℃ is used in sewage treatment facilities

D

Use 0-100 ℃ in low conductivity situations

X

Disinfect and ferment at 0-135 ℃

Y

High temperature and high pressure, organic matter 0-140 ℃ (1MPa)

R

Printing and dyeing electrodes

C

Ultra low temperature type -25-25 ℃

00

atmospheric pressure

pressure

06

≤0.6MPa

10

≤1.0MPa

W

No on-site instructions (integrated)

On site display method

M

On site pointer type mA meter display (integrated type)

E

On site LED display

C

On site LCD display

A

ABS

wetted material

P

UPVCOr PPR (indicate when ordering)

B

1Cr18Ni9Ti

F

Stainless steel polytetrafluoroethylene composite material

Q

Other materials

O

Not explosion-proof

explosion-proof

I

Intrinsic safety explosion-proof (4-20mA)Explosion proof grade Exia IIB T4

Installation length (sunken, plug-in) L=?

Measurement range conductivity

EC3000

Y

U

F

P

00

E

B

O

L=500mm

0-200us/cm

Example of Selection

5、 Wiring diagram

※ 24VDC wiring diagram ※ 220VAC wiring diagram

※ Users who choose this transmitter to be matched with PLC, DCS and other control systems need to equip their own isolation barriers.

※ Precautions and wiring for using explosion-proof transmitters

1.The transmitter housing is equipped with an external grounding, which must be reliably grounded when used by the user.

2.If explosion-proof isolation is required, the transmitter should be used in conjunction with a safety barrier

3.The use of safety barriers should comply with the relevant user manual

4.The connecting cable between the transmitter and the intrinsic safety end of the safety barrier is a two core shielded cable with a core wire cross-sectional area greater than 0.5mm. The cable allows a distributed capacitance of 0.08 μ F and a distributed inductance of 2mH. One end of the cable shielding wire is connected to the safety barrier busbar.

5.The installation, wiring, and maintenance of products should strictly comply with the electrical safety regulations for explosive hazardous areas in the People's Republic of China.

6、 Adjustment

1.Zero point verification

Drain the solution to be tested from the conductivity cell. If it is difficult to drain, close the shut-off valve and remove the transmitter from the flow cell. At this time, the electrode is exposed to the air, and the theoretical conductivity is zero. The transmitter output should be 4mA. Otherwise, adjust the zero potentiometer and correct the deviation (see wiring diagram). If the deviation cannot be eliminated, it indicates that the electrode is severely contaminated and should be cleaned.

2.Full range calibration

Standard solution conductivity method: At this point, the transmitter is in its usual measurement state (when the user is sampling and measuring a solution with known conductivity). For example, if the conductivity of the solution is known to be 10 μ s/cm, the nominal value of the corresponding signal can be calculated to be 16mA · DC. By adjusting the full potentiometer, the error displayed on the instrument can be corrected.

7、 Installation of transmitter

During installation, if the medium solution in the pipeline is not fully filled, the outlet shut-off valve should be adjusted to fill the pipeline with the medium solution before entering the measurement state. The installation method is shown in the diagram:

8、 Transmitter put into operation

After completing the required calibration, open the shut-off valve to ensure that the measured solution is filled in the conductivity cell, and the transmitter can enter the measurement state. Please note that the transmitter must be covered with a terminal cover before being put into operation, and it is not allowed to operate without a cover for a long time.

9、 Electrode maintenance

Pay attention to the electrode area to avoid damage caused by collision. When cleaning the electrode, close the shut-off valve, cut off the power supply of the transmitter, remove the transmitter from the conductivity pool, and according to the contaminated area and degree of the electrode, use a soft brush or degreasing cotton to scrub the electrode stains, remove impurities and dirt, clean it with clean water, and then put it back into the conductivity pool.