Main Functions	Measurement/Display/Transmission/Alarm/Automatic Cleaning
Screen parameters	3.5-inch high-definition monochrome display (320×240)
Measurement range	pH: 0–14.00 pH; ORP: ±2000 mV
Resolution	0.01 pH; 1 mV
Accuracy	±0.01 pH; ±1 mV
Temperature range	0–99.9°C
Temperature compensation thermistor	NTC10K/ NTC2.252K/ PT100/ PT1000
Analog output	Channel 2: 4–20 mA (500 Ω load), accuracy: ±0.2%
Relay output	3-way normally open/normally closed contact output 250 Vac / 30 Vdc / 3 A (max)
Input impedance	≥10¹²Ω
Alarm settings	Upper/Lower Limit Alarm (with configurable lookback and delay)
Power supply	Compatible with 220VAC and 24VDC
Communication interface	RS485
Protection rating	IP67
Relative humidity	<85%
External dimensions	144×152×113mm
Installation size	136×136 mm
Weight	0.8 kilograms

PH3000E Online pH/ORP Meter

As shown in the figure:

● Can be used with various pH and ORP sensors

● Supports tag number entry

● 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, preventing unauthorized modification of device parameters.

Technical Indicators:

Main Functions	Display/Transmission/Alarm/Communication
Screen specifications	2.8-inch high-definition monochrome display (320×240)
Measurement range	pH: 0–14.00 pH ORP: ±2000 mV
Resolution	0.01 pH; 1 mV
Temperature range	0–99.9°C
Temperature compensation thermistor	NTC10K, NTC2.252K, PT100, PT1000
Operating Conditions	Ambient temperature: 0–60°C
Input impedance	≥10¹² Ω
Output	4–20 mA (load < 750 Ω), RS485 optional
Alarm settings	Upper/Lower Limit Alarm (with configurable lookback and delay)
Power supply	Compatible with 220VAC and 24VDC
Communication interface	RS485
Protection rating	IP67
Relative humidity	<85%
External dimensions	113.5118136mm
Installation size	92*92mm
Installation method	Panel / Pipe / Wall Mounting

PH3200 Online pH/ORP Meter

As shown in the figure:

● Can be used with various pH and ORP sensors

● Fully intelligent, featuring high-precision AD conversion and microcontroller-based processing technology, with 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 electrode

● 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	pH: 0–14.00 pH, 0.01 pH ORP: ±2000, 0.1 mV Temperature: 0–99.9°C, 0.1°C
Automatic temperature compensation range	0–99°C, with 25°C as the reference.
Repeatability error of the electronic unit	±0.02 pH
Input impedance	≥10¹² Ω
Current-isolated output	0–10 mA (load < 1.5 kΩ), 4–20 mA (load < 750 Ω)
Output current error	≤±1%FS
High and low alarm relays	AC 220V, 3A
Power supply	AC 220 V ± 22 V, 50 ± 1 Hz or 24 V DC
Communication interface	RS485
Protection rating	IP65
External dimensions	146 (L) x 146 (W) x 108 (D) mm
Installation size	138 mm × 138 mm
Weight	0.8 kilograms