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OXY-LC Oxygen Sensor Interface Electronics

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Specification

TECHNICAL SPECIFICATIONS

Supply voltage
    RS485 variant8 to 28Vdc
    Analog variant20 to 28Vdc
Supply current600mA max. at 24Vdc
1.2A max. at 12Vdc
Digital outputRS485 (Modbus RTU) OR
PWM
Analog output4 to 20mA; load 600Ω max. OR
0-10Vdc; load 10kΩ min.
Temperature limits
    Storage-40 to 85⁰C
    Operating-30 to 70⁰C
Operating pressure limits¹260 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 calibration³0.5% O₂
Repeatability after calibration0.5% O₂
Output resolution0.01% O₂
Response time (step 10 to 90%)
    Fast response sensor connected4s
    Standard response sensor connected15s
Initial warm up time (till stable output)5 to 10 mins
Output inactive start up delay (heater warm up)
    From OFF to ON mode60s
    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

PinAssignment
RS485 VariantAnalogue Variants
1Sensor heater + (1)Sensor heater + (1)
2Sensor heater 0Vdc (2)Sensor heater 0Vdc (2)
3Sensor pumpSensor pump
4Sensor commonSensor common
5Sensor senseSensor sense
68-28Vdc20-28Vdc
70Vdc0Vdc
8RS485 A (+)4 to 20mA or 0 to 10Vdc
9RS485 B (-)Calibrate IN/PWM OUT

Features & Benefits

FEATURES

  • Allows quick and easy evaluation of the LuminOx sensor with minimum effort and/or design work
  • Interface screw terminals for easy wiring
  • The interface simultaneously provides three outputs; RS232 (serial interface voltage levels); RS485 (Modbus RTU) port allows multiple sensors to be addressed on a bus; 0-5V analogue output for basic measurements of oxygen only

BENEFITS

  • Converts the LuminOx TTL level RS232 output into three standard industrial outputs/li>
  • Auto detects ppO₂ or O₂% variants of LuminOx sensor

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