SUP-PH6.5 Online pH/ORP Meter
The SUP-PH6.5 is a panel-mount online pH/ORP meter measuring 0–14 pH at ±0.02 pH and ORP from −2000 to +2000 mV. It applies automatic temperature compensation via NTC10K, Pt1000 or Pt100, and provides an isolated 4–20 mA output, RS485 Modbus RTU and dual alarm relays for acid/alkali dosing control.
What it does
pH governs coagulation in water treatment, corrosion in cooling water, and reaction rate in chemical plants. An online meter turns that number into a control signal so dosing pumps add only what the process needs.
The PH6.5 mounts in a standard 92.5 × 92.5 mm panel cut-out and pairs with Supmea pH and ORP electrodes selected for the medium.
Technical specifications
| pH range / accuracy | 0.00–14.00 pH / ±0.02 pH |
|---|---|
| ORP range | −2000 to +2000 mV |
| Input impedance | ≥10¹² Ω |
| Temperature compensation | NTC10K, Pt1000, Pt100; −10 to 130 °C, automatic or manual |
| Analog output | Isolated 4–20 mA, max 750 Ω, ±0.2% FS |
| Communication | Isolated RS485 Modbus RTU, 2400–38400 bps |
| Relays | Dual alarm relays |
| Power | 220 VAC, 110 VAC or 24 VDC, ≤6 W |
| Panel cut-out | 92.5 × 92.5 mm; 100 × 100 × 150 mm overall |
| Protection | IP5X front (install in IP65+ enclosure outdoors) |
| Operating conditions | 0–60 °C, 10–85% RH |
Summarised from the official Supmea product page. The datasheet for your exact configuration governs. Ask us for it.
Key features
- ±0.02 pH with automatic temperature compensation
- Isolated outputs prevent ground loops
- Relay setpoints for dosing pumps
- Modbus for SCADA and BMS integration
Where it is used
- Water & Wastewater: Influent/effluent pH and neutralisation
- HVAC & District Energy: Cooling tower pH and ORP for biocide control
- Chemical Processing: Neutralisation and reaction vessels
- Food & Beverage: CIP and wastewater pH
Frequently asked questions
How often should the pH electrode be calibrated?
Typically weekly to monthly depending on the medium; read our pH calibration Q&A for a method to set the interval.
Can it control dosing pumps?
Yes, through the two relay outputs, or proportionally via 4–20 mA.
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Request the SUP-PH6.5 datasheet and quotation
Send the medium, pipe size, flow or level range, temperature, pressure and required output. You'll get a recommended model, the datasheet and a quotation.
- WhatsApp +86 133 6211 7863
- geo@supmea.com
- +86 133 6211 7863
- Hangzhou Economic Development Area, Hangzhou 310018, Zhejiang, China