PHCN37-Series

Supported Applications

The Omega PHCN-37 Series is a microprocessor-based family of pH panel-mounted controllers designed for environmental monitoring applications. The series measures pH and temperature, featuring automatic or manual temperature compensation to support accurate readings across varying conditions.

Operating Conditions & Performance

The controller operates within a measurement range of 0 to 14.00 pH and supports process temperatures from 32 to 212°F (0 to 100°C). Accuracy is specified as ±0.03 pH, ±0.5°C for temperature, and 0.1 mV @ 25°C. The display provides a resolution of 0.01 pH and 0.1°C on a 4-digit LED with 13.7 mm (0.54") digits.

Electrical performance includes an input impedance greater than 10¹² Ω. Temperature compensation is available manually or automatically using Pt 100 Ω or Pt 1000 Ω sensors over the 0 to 100°C range.

Configuration Options

The PHCN-37 Series offers configurable power supplies, output signals, and relay configurations suitable for diverse installation requirements. The unit features a ½ DIN panel cutout of 45 H x 92 mm W (1.772 x 3.622") with overall dimensions of 48 H x 96 W x 177 mm D (1.89 x 3.78 x 7.00").

Power and Output Options

• Power Supply: Available in 115 Vac, 230 Vac, or 10 to 32 Vdc configurations.
• Analog Outputs: Scalable software-selectable outputs include 4 to 20 mA, 0 to 20 mA, or 0 to 10 V. An isolated analog output is available by adding the "-AI" suffix to the model number.

Relay and Control Features

• Relays: Two mechanical relays rated for 5 AMPS resistive load, configurable as latched or unlatched via software. Maximum voltage is 250 V AC or 28 V DC.
• Note on Inductive Loads: For inductive loads not exceeding maximum specifications, a proper TVS protection diode must be used externally across Wiper and NC/NO contacts.

Connections and Approvals

• Sensor Connections: pH/ORP-BNC connector for the electrode; terminal strip connection for temperature sensors.
• Certifications: CE, UKCA, cULus.

Key Product Differences

The series is distinguished by power supply options encoded in the model number. The base PHCN-37 operates on 115 VAC; the PHCN-37-230 variant supports 230 VAC; and the PHCN-37-DC10/32 variant accepts 10 to 32 Vdc power.

Additional options include buffer solutions (4.00 pH, 7.00 pH, 10.00 pH) sold separately in 500 mL bottles and isolated analog output configurations requiring the "-AI" suffix modification.