3-Point pH Quick Calibration pH ORP Controller with NTC10K PT1000 Temperature Compensation and 3.2 inch Graphic LCD Online pH ORP Analyzer

The APX1-C2 online pH/ORP controller is designed to make accurate water-quality measurement simple to operate and easy to maintain. A bright 3.2 inch graphic LCD presents pH, ORP and temperature at a glance, while a dedicated quick calibration menu lets operators complete routine calibration in minutes without navigating deep menu trees.

Calibration follows a clear, repeatable procedure: pH uses 3-point calibration with 4.01, 6.86 and 9.18 standard solutions, and ORP uses 2-point calibration with 86 mV and 256 mV solutions. Any calibration value can be modified to match another standard solution if needed. A long press of the Enter button on the measurement screen opens the quick calibration sub-display, which shows the reset option, the relevant calibration point and an exit option together.

Because pH is temperature sensitive, the controller provides NTC10K or PT1000 automatic (or manual) temperature compensation across a -10~+150 ℃ range. Power-failure protection retains every parameter indefinitely, so the instrument resumes precise operation immediately after an interruption without recalibration. The IP66 panel-mount housing, dual 4~20 mA outputs, two SPST relays and RS485 Modbus RTU / JSON interface complete a versatile, operator-friendly instrument.

1. Quick calibration menu: complete pH or ORP calibration with a single key press per step, straight from the measurement screen.
2. pH 3-point & ORP 2-point calibration: improves accuracy across the full measuring range.
3. Clear 3.2 inch graphic LCD: multi-line readout of pH, ORP and temperature at a glance.
4. NTC10K / PT1000 temperature compensation: automatic or manual, for stable readings from -10 to +150 ℃.
5. Power-failure protection: all parameters retained indefinitely — no recalibration after power loss.
6. Flexible connectivity and control: RS485 Modbus RTU / JSON, two 4~20 mA outputs and two SPST relays.
7. Rugged IP66 panel-mount design: compact 100×100×120 mm enclosure for demanding environments.

• Laboratory and field water quality analysis
• Drinking water, surface water and groundwater monitoring
• Swimming pool and spa water balance control
• Aquaculture and fish farming water management
• Industrial process water and CIP systems
• Wastewater treatment monitoring and reporting