500 pH/ORP

Cole-Parmer 500 pH/ORP/Temperature 1/4-DIN Controller

Description
The Cole-Parmer 500 pH/ORP/Temperature Controller is a high-performance 1/4-DIN instrument designed for accurate monitoring and control of pH, oxidation-reduction potential (ORP), and temperature in industrial and laboratory processes. It combines precise measurement, flexible control outputs, and secure system features in a compact, panel-mountable enclosure. The controller is well suited for demanding applications that require reliability, accuracy, and remote communication capability.

Key Feature 

• Measures pH, ORP (mV), and temperature in a single controller

• Isolated and reversible 4–20 mA output for proportional control

• Five programmable SPDT relays (four assignable to pH/ORP, one to temperature) for on/off control

• Backlit graphic LCD displaying measurement values, temperature, electrode condition, relay status, and output current

• Automatic buffer recognition supporting US and NIST pH buffers

• Automatic temperature compensation (ATC) with selectable sensor types:

  • 10K NTC

  • 3K Ω Balco

  • 1000 Ω Platinum RTD

• RS-485 communication for remote monitoring and control of multiple units

• Password protection to prevent unauthorized access

• Calibration data stored in memory for immediate use after power cycling

Specifications:
Measurement Ranges

• pH: 0.00 to 16.00 pH

• ORP: −2500 to +2500 mV

• Temperature: −10 to 120 °C (14 to 248 °F)

Accuracy & Resolution

• pH accuracy: ±1% + 1 digit

• pH resolution: 0.01 pH

• ORP accuracy: ±2 mV

• ORP resolution: 1 mV

• Temperature accuracy: ±0.3 °C

• Temperature resolution: 0.1 °C

Outputs & Control

• Output signal: Isolated 4–20 mA

• Relay output: 5 SPDT relays

• Control type: On/Off

Electrical

• Power supply: 115 / 230 VAC

• Frequency: 50 / 60 Hz

Physical

• Housing: 1/4-DIN panel mount

• Width: 9.53 cm (3.75 in)

• Height: 9.53 cm (3.75 in)

• Depth: 14.76 cm (5.81 in)

Typical Applications

• Water and wastewater treatment systems

• Chemical processing and dosing control

• Food and beverage production

• Pharmaceutical and biotechnology processes

• Industrial process monitoring and automation

• Laboratory and pilot-plant systems

• Environmental monitoring installations