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OXY-LC Oxygen Sensor Interface Electronics

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Specification

TECHNICAL SPECIFICATIONS

Supply voltage
    RS485 variant 8 to 28Vdc
    Analog variant 20 to 28Vdc
Supply current 600mA max. at 24Vdc
1.2A max. at 12Vdc
Digital output RS485 (Modbus RTU) OR
PWM
Analog output 4 to 20mA; load 600Ω max. OR
0-10Vdc; load 10kΩ min.
Temperature limits
    Storage -40 to 85⁰C
    Operating -30 to 70⁰C
Operating pressure limits¹ 260 to 1260mbar absolute/td>

OUTPUT VALUES

Oxygen range (analog output) 0.1² to 25% O₂ OR
0.1² to 100% O₂
Oxygen range (Modbus RTU) 0.1² to 100% O₂
Accuracy after calibration³ 0.5% O₂
Repeatability after calibration 0.5% O₂
Output resolution 0.01% O₂
Response time (step 10 to 90%)
    Fast response sensor connected 4s
    Standard response sensor connected 15s
Initial warm up time (till stable output) 5 to 10 mins
Output inactive start up delay (heater warm up)
    From OFF to ON mode 60s
    From standby to ON mode (RS485 only) 20s

OUTLINE DRAWINGS

OXY-LC-layout

¹Sensor and interface for correct barometric pressure compensation.
²Prolonged operation below 0.1% O₂ can damage the sensing element.
³Analog output variants accuracy stated is valid wen calibration at the default calibration value. RS485 variant accuracy stated is valid when calibrated at the default 20.7% O₂ 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.

ELECTRICAL INTERFACE

OXY-LC-Board

Pin Assignment
RS485 Variant Analogue Variants
1 Sensor heater + (1) Sensor heater + (1)
2 Sensor heater 0Vdc (2) Sensor heater 0Vdc (2)
3 Sensor pump Sensor pump
4 Sensor common Sensor common
5 Sensor sense Sensor sense
6 8-28Vdc 20-28Vdc
7 0Vdc 0Vdc
8 RS485 A (+) 4 to 20mA or 0 to 10Vdc
9 RS485 B (-) Calibrate IN/PWM OUT

Features & Benefits

FEATURES

  • Provides the electronics necessary to power and control SST’s range of zirconium dioxide oxygen sensors
  • Built in pressure sensor for barometric pressure compensation
  • Interface mounted screw terminals for easy wiring with reverse voltage and transient overvoltage

BENEFITS

  • Adaptive software filtering provides a fast sensor response coupled with a stable output
  • High accuracy linear output

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