OXY-LC-A25-455 SST Sensing

OXY-LC Oxygen Sensor Interface FEATURES AND BENEFITS Provides the electronics necessary to power and control SSTs range of dynamic oxygen (O ) 2 sensors. Built in pressure sensor for barometric pressure compensation. Three interface variants available: RS485, 0-10V DC and 4-20mA outputs. OXY-LC Oxygen Sensor Interface RS485 output benefits: 1. RS485 Modbus RTU Protocol allows complete control of the sensor operation and access to all available information including sensor diagnostics, barometric pressure and pressure sensor temperature. 2. Adjustable communication settings including the ability to change the slave address of the interface allowing up to 32 devices to communicate on the same bus. Each device presents a single unit load to the network. Ideal when multiple oxygen readings are required. 3. Three modes of operation OFF, ON and Standby. Standby applies half the sensor heater voltage to protect the sensor from condensation and reduce the warm up time when returning to ON mode. APPLICATIONS 4. Adjustable sensor heater voltages to suit different sensor types. 5. Default calibration to 20.7% O for calibration Combustion control including oil, gas and 2 in normal air but can be changed to any other biomass boiler applications. O concentration for calibration with reference 2 Oxygen generation systems. gases. Medical. 0-10V and 4-20mA output benefits: DC Scientific including respiratory studies of a community or an organism, plants and 1. High accuracy linear output represents either 0.1 to 25% O or 0.1 to 100% O . 2 2 animals. 2. Four sensor heater voltages available to suit Food and beverage packaging different sensor types and cable lengths 3. PWM output for diagnostics also doubles up as Applications where low oxygen is key a calibration input. including fermentation, rust and corrosion 4. For the 0.1 to 25% O variants the default 2 prevention, fire prevention, inerting and calibration is to 20.7% O for calibration in 2 (1) normal air. For the 0.1 to 100% O variants the purging. 2 default calibration is to 100% O for calibration 2 to full scale with pure oxygen. Notes: Adaptive software filtering provides a fast sensor 1. Minimum allowable O concentration is 0.1% O . 2 2 response coupled with a stable oxygen output. Operation below 0.1% O will damage the 2 sensing element and must be avoided. Interface mounted screw terminals for easy wiring with reverse voltage and transient overvoltage 2013 SST Sensing Ltd 1 of 23 DS0058 Rev 5 CONTENTS General Description Page 3 Specifications Page 3 Performance Characteristics Page 3 RS485 Variant Electrical Connections Page 4 Default Communication Settings Page 4 Modbus Input Registers Pages 5 and 6 Modbus Holding Registers Page 7 Modbus Notes Pages 8 to 10 Analogue Variants (0-10Vdc and 4-20mA) Electrical Connections Page 11 Analogue Output Values Table Page 11 Calibrate IN/PWM OUT Notes Pages 12 to 14 General Operating Procedures General Operating Overview Page 15 Installation Procedure Page 16 Calibration Procedure Page 17 Normal Operation Diagnostics Routine Page 18 Shutdown Procedure Page 19 Sensor Operating Tips Pages 20 and 21 Outline Drawing and Mounting Information Page 22 Ordering Information Page 23 2013 SST Sensing Ltd 2 of 23 DS0058 Rev 5