● Provides a 4–20 mA current output channel for transmitting the primary measured parameter or temperature measurement; RS485 output is also available as an option.

● Provides two relay outputs (upper/lower limit alarms), supporting both normally open and normally closed wiring configurations.

● Automatic temperature compensation

● Default factory setting is Chinese; supports both Chinese and English menu display.

● The entire unit features an IP67 protection rating, enabling outdoor, open-air installation and operation.

● Provides password management permissions for operational access to prevent unauthorized modification of device parameters.

Technical Indicators:

Main functions	Display/Transmission/Alarm/Communication
Screen specification	2.8-inch high-definition monochrome screen (320×240)
Measurement range	0–20 mg/L
Temperature range	0–99.9°C
Automatic temperature compensation	Yes
Output	4–20 mA (load < 750 Ω)
Alarm settings	Upper/Lower Limit Alarm (with configurable lookback and delay)
Power supply	AC 220V or 24V DC
Communication interface	RS485
Protection rating	IP67
Relative humidity	<85%
External dimensions	113.5118136mm
Installation size	92*92mm
Installation method	Panel / Wall Mounting

DOT3200 Online Dissolved Oxygen Meter

As shown in the figure:

● Fully intelligent, featuring high-precision AD conversion and microcontroller-based processing technology for powerful functionality

● High reliability: components are integrated onto a single circuit board, eliminating the need for complex function switches and potentiometers

● Strong anti-interference capability and excellent electromagnetic compatibility

● Automatic range switching within the measurement range covered by the Sensor

● Phase-sensitive detection: Eliminates the influence of lead wires on concentration measurement

● 4–20 mA current output, or RS485 output

● Standard IP65 waterproof body design

● Can be installed on dials, pipelines, and walls

Technical Indicators:

Measurement range	0–20.00 mg/L (automatic switching)
Resolution	0.1 µg/L: 0.01 mg/L; 0 1℃
Basic error of the entire instrument	µg/L: ±1.0% FS; mg/L: ±0.5% FS; Temperature: ±0.5°C
Repeatability of the instrument reading	±0.5%FS
Stability of the overall instrument reading	±1.0%FS
Response time	<60 seconds (98% of the final value, 25°C); 37°C: 98% of the final value in <20 seconds
Output current error	≤+1.0%FS
Isolated output	0–10 mA (load < 1.5 kΩ), 4–20 mA (load < 750Ω)
Communication interface	RS485 optional
Alarm relay	AC 220V, 3A
Power supply	220 VAC or 24 VDC
External dimensions	146 (L) x 146 (W) x 108 (D) mm
Installation size	138x138mm
Working Conditions	Ambient temperature: 0–60°C, relative humidity <85%
Installation Method	Panel / Wall Mounting