DATA SHEET OXY-LC Oxygen Sensor Interface Board FEATURES Provides the electronics necessary to power and control SST's range of zirconium dioxide (ZrO 2) sensors Built in pressure sensor for barometric pressure compensation Interface mounted screw terminals for easy wiring with reverse voltage and transient overvoltage Supply Voltage Temp BENEFITS Analogue Output Response Time OUTPUT VALUES Adaptive software filtering provides a fast sensor response coupled with a stable oxygen output High accuracy linear output TECHNICAL SPECIFICATIONS Supply voltage RS485 variant: 8--28VDC Analogue variants: 20--28VDC Supply current 600mA max. at 24VDC 1.2A max. at 12VDC Digital output RS485 (Modbus RTU) or PWM Analogue output 4--20mA; load 600 max or 0--10VDC; load 10k min Temperature limits Storage: -40C to +85C Operating: -30C to +70C Operating pressure limits1 260--1260mbar absolute NOTES Digital Output 1) 2) 3) Oxygen range (analogue output) or Oxygen range (Modbus RTU) Accuracy after calibration3 Repeatability after calibration Output resolution Response time (step 10--90%) Fast response sensor connected: Standard response sensor connected: Initial warm up time (till stable output) Output inactive start up delay (heater warm up) From OFF to ON mode: From Standby to ON mode (RS485 only): 0.12--25% O2 0.12--100% O2 0.12--100% O2 0.5% O2 0.5% O2 0.01% O2 4s 15s 5--10mins 60s 20s Need help? Ask the expert Tel: + 44 (0)1236 459 020 and ask for "Technical" Sensor and interface for correct barometric pressure compensation. Prolonged operation below 0.1% O2 can damage the sensing element. Analogue output variants accuracy stated is valid when calibrated at the default calibration value. RS485 variant accuracy stated is valid when calibrated at the default 20.7% O 2 over the range 0.1 to 25% O2. For maximum accuracy above 25% O2 the interface and sensor should be calibrated to full scale of the required range using certified gas. OUTLINE DRAWING AND MOUNTING INFORMATION All dimensions shown in mm. Tolerances = 1mm. ELECTRICAL INTERFACE Always handle the interface board using the correct ESD handling precautions. RS485 Variant Analogue Variants Pin Assignment Pin Assignment 1 Sensor Heater + (1) 1 Sensor Heater + (1) 2 Sensor Heater 0VDC (2) 2 Sensor Heater 0VDC (2) 3 Sensor Pump 3 Sensor Pump 4 Sensor Common 4 Sensor Common 5 Sensor Sense 5 Sensor Sense 6 8--28VDC 6 20--28VDC 7 0VDC 7 0VDC 8 RS485 A (+) 8 4--20mA or 0--10VDC 9 RS485 B (-) 9 Calibrate IN/PWM OUT Output Value Comm. Setting Default Value Address 1 Baudrate 9600 Parity None 20.7% 8.28VDC 2.07VDC 17.25mA 7.34mA Stopbits 1 100% - 10VDC - 20mA 90% - 9.0VDC - 18.4mA 25% 10VDC 2.5VDC 20mA 8mA 5% 2.0VDC 0.5VDC 7.2mA 4.8mA 0.1% 0.04VDC 0.01VDC 4.06mA 4.02mA 0--10VDC O2 % 4--20%mA 0.1--25% O2 0.1--100% O2 0.1--25% O2 0.1--100% O2 Notes: 1. Output pins 1 through 5, refer to appropriate SST oxygen sensor datasheet for wiring/pin designations. 2. Every SST oxygen sensor has two heater connections which should be connected to pins 1 & 2 of the OXY-LC; the heater coil has no polarity. However when connecting to a sensor where the sensor housing is one of the heater connections, pin 2 of the OXY-LC should be connected to the housing. ORDER INFORMATION Generate your specific part number using the convention shown below. Use only those letters and numbers that correspond to the options you require -- omit those you do not. Digital Variant O X Y Analogue Variants - L C - 4 8 5 O X Y - L C - X X X - X X X Output Type O2 Measurement Range (vol O2%) Heater Voltage / Response Time / Termination A Current: 4--20mA 25 Analogue 0.1--25% 400 4.00V, 15s response sensor, short cable (<150mm) V Voltage: 0--10V 100 Analogue 0.1--100% 420 4.20V, 15s response sensor, long cable (>150mm) 435 4.35V, 4s response sensor, short cable (<150mm) 455 4.55V, 4s response sensor, long cable (>150mm) CAUTION INFORMATION Do not exceed maximum ratings and ensure sensor(s) are operated in accordance with their requirements. Carefully follow all wiring instructions. Incorrect wiring can cause permanent damage to the device. Zirconium dioxide sensors are damaged by the presence of silicone. Vapours (organic silicone compounds) from RTV rubbers and sealants are known to poison oxygen sensors and MUST be avoided. Do NOT use chemical cleaning agents. Failure to comply with these instructions may result in product damage. As customer applications are outside of SST Sensing Ltd.'s control, the information provided is given without legal responsibility. Customers should test under their own conditions to ensure that the equipment is suitable for their intended application. For detailed information on the sensor operation refer to application note AN0043 Operating Principle and Construction of Zirconium Dioxide Oxygen Sensors. For technical assistance or advice, please email: technical@sstsensing.com General Note: SST Sensing Ltd. reserves the right to make changes to product specifications without notice or liability. All information is subject to SST Sensing Ltd.'s own data and considered accurate at time of going to print. DS-0058 REV 6 (c) 2016 SST SENSING LTD. 5 H A GMI LL C RESE NT , SHAW HEA D IN DU ST RIA L E ST AT E, C OA TB RI D GE, U K M L5 4 NS w w w .sstsensi ng .com | e: sal es@ss tse nsin g.com | t : + 44 ( 0 )12 36 4 5902 0 | f: +4 4 (0 ) 123 6 459 02 6