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PT6500 Online TDS Meter Controller

PT6500 provides continuous TDS monitoring with automatic temperature compensation, trend recording, three control relays, password protection and 4–20 mA/Modbus connectivity for managed water processes.

Applications

  • Drinking-water treatment

  • Environmental sewage monitoring

  • River and lake water quality

  • Food and tap-water processing

  • Electroplating systems

  • Aquaculture and agricultural irrigation

Key Features & Advantages

01
Clear Full-Color Display
The full-color multi-line screen presents TDS values, operating status and settings clearly for convenient onsite operation.
02
Data Logging and Trends
Built-in data logging and trend-chart display support historical review, process analysis and faster troubleshooting.
03
Compensation and Automatic Calibration
Automatic temperature compensation and multiple calibration functions help maintain reliable Total Dissolved Solids measurement as water conditions change.
04
Three Relay Control Outputs
Three relays support high-limit, low-limit and hysteresis control for alarms, dosing equipment and automated process actions.
05
Dual Communication and Security
4-20 mA and RS485 connections integrate with control systems, while password protection helps prevent unauthorized settings or accidental misoperation.

Video

Video

Download

File Name
Time
Type
Download
PT6500 Water Quality Online Monitoring Controller-Datasheet-POKCENSER
Sep 08, 2026
PDF

Technical Data

Parameters

Configuration

Temperature

-10~150 ℃(According to electrode)

Temperature Resolution

0.1℃

Temperature Error

±0.3℃

Temperature Compensation Range

0~150℃

Temperature Compensation

Automatically or manually

Current Output

2 channels of 4~20mA, 20~4mA, 0~20mA

Communication Output

RS485 Modbus RTU

Other Function

Data logging/Trend charting

Relay Control Contact

Three groups: 5A 240VAC; 5A 28VDC or 120VAC

Optional Power Supply

85~265VAC; 9~36VDC. Power: ≤3W

Working Environment

No strong magnetic field interference around except the earth's magnetic field

Ambient Temperature

-10~60℃

Relative Humidity

≤90%

Protection Level

IP65

Instrument Weight

1.5kg

Instrument Dimensions

235 × 185 × 120mm

Instrument Installation Method

Wall mounted


Monitoring Factor

PT6500 Series

Range

Resolution

Accuracy

Stability

pH/ORP

PT6500

-2-16pH; ±2000mV

0.001pH; 1mV

±0.01pH;

±1mV

≤0.01pH/24h;

≤1mV/24h

Lon

PT6510

0-99999mg/L

0.01mg/L

±2.5%

-

Conductivity

PT6530

0-500ms/cm

0.01µS/cm; 0.01mS/cm

±0.5%F.S

±0.2%F.S/24h

Resistivity

0-18.82MΩ/cm

0.01KΩ/cm; 0.01MΩ/cm

TDS

0-250g/L

0.01mg/L; 0.01g/L

Salinity

0-700ppt

0.01PPT; 0.1%; 0.01mg/L

Acid, Alkali and Salt Concentration

PT6536


NAOH:0-16%

0.01%  

±0.25%


±0.25%/24h


CaCL2:0-22%

NACL/HNO3/HCL/H2SO4:0-10%

Electromagnetic conductivity

PT6538

0~2000mS/cm

0.01µS/cm; 0.01mS/cm  

±0.5%FS

±0.2%F.S/24h

0~1000g/L

0.01mg/L; 0.01g/L

See chemical concentration table

Concentration 0.01%;

Concentration 0.2%;

Polarographic Dissolved Oxygen

PT6540

0-40mg/L, 0-400%

0.01mg/L; 0.1%

±1%F.S

<2%F.S/week

Trace Dissolved Oxygen

PT6542

0-200µg/L-20.0mg/L

0.1µg/L; 0.01mg/L

±1%F.S

<2%F.S/week

Fluorescent Dissolved Oxygen

PT6546

0-20.0mg/L; 0-100%

0.01mg/L; 0.1%

±1%F.S

<2%F.S/week

Turbidimeter

PT6570

0.001-9999NTU

0.001NTU

±1%F.S

-

Suspended Solids Concentration

PT6575

5.00-50000mg/L

0.01mg/L; 0.01g/L

±1%F.S

-

Constant Pressure Residual Chlorine Meter

PT6550

0-20.00mg/L(ppm)

0.001mg/L

±1%F.S

Responding time: 90%<90s

Membrane Residual Chlorine Meter

PT6555

0-10.00-20.00mg/L

0.001mg/L

±1%F.S


pH:0~14.00pH

pH:0.01pH

pH:±0.05pH

Responding time: 90%<90s

Constant Pressure Chlorine Dioxide

PT6553

0-20mg/L

0.001mg/L

±1%F.S

Responding time: 90%<90s

Constant Pressure Ozone

PT6558

0-20mg/L

0.001mg/L

±1%F.S

Responding time: 90%<90s

Mud Level

PT6580

0.2-12m

0.001m

±1%F.S

Velocity: ≤3m/s

Universal

PSC6500






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