Products

PH/ORP Controller

ROC pH/ORP‑3500 is an economical, panel-mounted instrument designed for online pH or ORP measurement and control. It features plug-in sensors (pH/ORP-1220B) and excels in industrial environments.

ROC pH/ORP-3500 series offers a reliable, user-friendly solution for online pH and ORP monitoring, with flexible power options, robust analog and relay outputs, easy calibration, and rugged industrial design

Features & Specifications

Measurement Range

• pH: 0.00–14.00 (pH), with optimal accuracy in the 2–12 pH range
• ORP: –2000 mV to +2000 mV, resolution 1 mV

Resolution & Accuracy

• pH resolution: 0.01, accuracy ±0.1 pH;
• ORP resolution: 1 mV, accuracy ±5 mV

Temperature Measurement & Compensation

• Built-in or external NTC 10 kΩ sensor;
• Temp resolution 0.1 °C, accuracy ±0.5 °C

Display & Calibration

• White-backlit LCD with large icons; multiple buffer solutions supported for calibration (10.00, 9.18, 7.00, 6.86, 4.00, 4.01)

Outputs & Control

• Isolated 4–20 mA output (select between transmitter or instrument mode);
• Dual relay outputs (high and low alarm) with delayed control

Power & Installation

• Accepts multiple power inputs: DC 24 V, AC 110 V/220 V at 50/60 Hz;
• Panel-mounted unit (48×96×80 mm), cutout size 44×92 mm

Environmental Tolerance & EMC

• Operates from 0–50 °C, humidity up to 85% RH (non-condensing);
• Low power consumption (~<3 W); built for industrial EMI environments 

Certification

• CE certified

Applications

This controller is ideal for any online monitoring and control of pH or ORP in processes like:

• Water/wastewater treatment
• Pure water systems
• Industrial process control
• Environmental monitoring and labs