KEEPSMART AUTOMATION

Water Quality Analyzers And Sensors

On-line Disinfectant Analyzer

General Controller

1. Introduction

This is a universal water quality controller, designed to work seamlessly with our full range of digital water quality sensors. It monitors key water quality parameters including pH, ORP, conductivity/TDS, dissolved oxygen, turbidity, sludge concentration (MLSS), disinfectant (free chlorine, chlorine dioxide, ozone, total chlorine), and more.

Data can be transmitted to the control room via RS485 or 4-20mA analog signals for continuous recording and monitoring.

2. Features

Universal compatibility with digital sensors: pH/ORP, conductivity/TDS, dissolved oxygen, turbidity, MLSS, and disinfectant sensors.
Isolated current output ensures high noise immunity and reliable signal transmission.
Isolated RS485 communication with Modbus-RTU protocol for stable data exchange.
High/low alarm relay outputs.
Audible and visual alarm function.
LCD backlight on/off control, adaptable to different ambient light conditions.

Product Details>>

Parameter	Specification
Measuring Range	pH: 0–14 pH ORP: -2000–2000 mV Dissolved Oxygen: 0–20 mg/L Conductivity: 0–20000 µS/cm TDS: 0–10000 mg/L Turbidity: 0–4000 NTU MLSS: 0–30000 mg/L Disinfectants (Free Cl₂/ClO₂/O₃/Total Cl₂): 0–20 mg/L Note: Actual range depends on the connected sensor.
Display	2.8" monochrome LCD, 128×64 resolution
Dimensions	100 × 100 × 150 mm
Panel Cutout	92.5 × 92.5 mm
Supported Parameters	pH / ORP / Conductivity / TDS / Dissolved Oxygen / Turbidity / MLSS / Disinfectants
Sensor Input Accuracy	Refer to the connected sensor’s specifications
Repeatability	Refer to the connected sensor’s specifications
Current Output	Isolated 4–20 mA, range configurable; Load ≤500 Ω; Accuracy ±0.2% FS
RS485 Output	Isolated, Modbus-RTU protocol
Alarms	2-channel relay (NO/NC), rating AC 250 V / 3 A
Power Distribution Output	12 V DC / 125 mA
Ambient Humidity	10–85% RH (non-condensing)
Power Supply	AC: 100–240 V AC DC: 24 V DC (optional)
Power Consumption	≤6 W
Cable Entries	1 × M12×1.5 gland 2 × M16×1.5 glands
Operating Temperature	0–60 ℃
Storage Conditions	Temperature: -15–65 ℃ Humidity: 5–95% RH (non-condensing) Altitude: <2000 m