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OXY-LC Oxygen Sensor Interface Electronics

OXY-LC Oxygen Sensor Interface Electronics

The OXY-LC Interface Electronics unit is designed to power and control SST’s zirconia oxygen sensor range, delivering reliable performance across a variety of applications.

Users can choose from multiple configurable output formats including RS485, PWM, 0–10 VDC, and 4–20 mA. The RS485 Modbus RTU protocol provides enhanced functionality—enabling full control of sensor settings and access to detailed information such as sensor diagnostics, barometric pressure, and internal temperature readings.

Advanced adaptive software filtering ensures a fast yet stable oxygen measurement response. The OXY-LC also delivers a precise, linear output across the full range of SST’s zirconia sensors.

Featuring a built-in barometric pressure sensor and interface-mounted screw terminals, the unit offers easy installation along with protection against incorrect wiring and electrical surges.

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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)
  PWM
Analogue output 4—20mA; load 600Ω max
  0—10VDC; load 10kΩ min
Temperature limits
  Storage: -40°C to +85°C
  Operating: -30°C to +70°C
Operating pressure limits 260—1260mbar absolute

OUTPUT VALUES

Oxygen range (analogue output) 0.1—25% O2
  0.1—100% O2
Oxygen range (Modbus RTU) 0.1—100% O2
Accuracy after calibration 0.5% O2
Repeatability after calibration 0.5% O2
Output resolution 0.01% O2
Response time (step 10—90%)
  Fast response sensor connected: 4s
  Standard response sensor connected: 15s
Initial warm up time (till stable output) 5—10mins
Output inactive start up delay (heater warm up)
  From OFF to ON mode: 60s
  From Standby to ON mode (RS485 only): 20s

ELECTRICAL INTERFACE

Pin Assignment
       RS485 Variant Analogue Variant
1     Sensor Heater + Sensor Heater + (1)
2     Sensor Heater 0VDC 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—20mA or 0—10VDC
9     RS485 B (-) Calibrate IN/PWM OUT

KEY FEATURES

  • Supplies the required electronics to operate and control SST’s zirconia (ZrO₂) oxygen sensors
  • Integrated pressure sensor enables barometric pressure compensation
  • Interface-mounted screw terminals for straightforward wiring, with built-in protection against reverse voltage and transient overvoltage

Downloads

Downloads

Datasheets

User Guide

3D STEP File