Newport 325AN Temperature Controller with Analog Interface

The Newport 325AN Temperature Controller with Analog Interface delivers precise thermal regulation for thermoelectric modules, laser diodes, and temperature-dependent applications. Built on a hybrid proportional-integral control loop, it maintains stable operation across multiple sensor types and operating modes. The bipolar constant current source outputs ±2.5 A with <1 mA ripple, while user-adjustable current limiting protects TE modules from overcurrent damage. Remote control and real-time monitoring are enabled through an analog interface supporting TTL command inputs and status outputs.

– Technical Specifications

• Output: Bipolar constant current source, ±2.5 A maximum
• Control Loop: Hybrid proportional-integral (P-I)
• Output Power: 15 W available
• Current Limit Range: 0 to 2.5 A with ±10 mA accuracy
• Ripple/Noise: <1 mA rms
• Compliance Voltage: 6 V (refer to original documentation)
• Operating Modes: Constant R (thermistor), Constant T (IC sensors), Constant ITE (TE cooler)
• Power Input: 90–125 VAC or 180–250 VAC, 50–60 Hz
• Operating Temperature: 0°C to 50°C
• Storage Temperature: −40°C to +70°C
• Dimensions: 88 × 215 × 280 mm (3.5 × 8.5 × 11 in.)
• Weight: 2.9 kg (6.5 lb.)

– Key Features

• TE module protection via independent user-adjustable current limit
• TTL-based analog interface for instrument control and status monitoring
• Direct temperature readout in °C when using IC temperature sensors
• Low-noise bipolar output suitable for sensitive thermal applications
• Isolated BNC analog output for external monitoring

– Compatibility & Integration

• Sensor Types: Thermistors, AD592/AD590/LM335 IC sensors
• Output Connectors: 15-pin female D-sub for TE module and sensor
• Analog Interface: 15-pin high-density D-sub (female)
• Chassis Ground: 4 mm banana jack