Introduction:

EC/TDS-6800 online Conductivity / TDS / Resistivity controller can continuously measure and control conductivity/ TDS / Resistivity value of water.

It is widely used for the science laboratory equipment, chemical, pharmaceutical, environmental protection, metallurgy, paper making, food, beverage, water supply industry, etc.

In accordance with the environment and characteristics of water industry, as well as the international power supply standard, considering the electricity design in special environment, the Conductivity / TDS / Resistivity controller could be supplied with power 220V AC( Standard), 110V AC and safe low voltage 24V AC, 24V DC(Optional)

Main Features:

English language display

Measure Conductivity/TDS/Resistivity and Temperature, high/low limit relay control output , 4-20mAcurrent output, digital Modbus RS485 communication output (Optional)

High/low limit alarm light, double relay, alarm delay could be set

Instrument mode isolated transmitting port, max circle resistance up to 750Ω² PID control to actuate and control powered variable value through 4-20 mA output (optional)

Back light of LCD could select power saving mode, timing automatic off, brightness adjust,

Conductivity constant input directly function or to calibrate probe constant as per known calibration solution’s conductivity value

High performance CPU, good electromagnetic compatibility

AC input be fused function

ESD over voltage protection is available

Password management avoid non-professional person to operate

Main Technical Index：

Outline dimensions and fixed Installation：

Insert the controller from the front panel, install the fix clamp(up and down), tighten with the screws.

Chart 1 Fixed support installation

Probe constant selection: 

                     Chart 2

Probe installation type：

4-20mA current output formula：

1.PH Current output formula:

Factory setting define output current value is :0 pH is corresponding value of 4 mA; 14 pH is corresponding value of 20 mA.

I = ( D – 4 mA corresponding value）× ( 16 / (20 mA corresponding value- 4 mA corresponding value) ) + 4.00

I = ( D – 0 ）× ( 16 / 14 ) + 4.00

Note: I is output current value 4 mA≤I≤20 mA

D is pH value displayed by the instrument 0.00pH≤D≤14.00pH

2. Formula of ORP current output:

Factory setting define the output current is :-2000mV is corresponding

value of 4 mA; +2000mV is corresponding value of 20 mA.

I = ( D – 4 mA corresponding value ）× ( 16 / (20 mA corresponding value – 4 mA corresponding value) ) + 4.00

I = ( D – (-2000) ）× ( 16 / (+2000 – (-2000)) ) + 4.00

I = ( D + 2000 ）× ( 16 / 4000) ) + 4.00

Note:I is output current value 4 mA≤I≤20 mA

D is ORP value displayed by the instrument -2000mV≤D≤+2000mV