SGX-OX-ROHS-LP custom sensor type configuration

TECHNICAL SUPPORT Sensors & Modules
1

Customer:

I’m trying to use an oxygen sensor from SGX with the Arduino library. I need to create a custom sensor type but cannot find the necessary information in the datasheets. How do I configure the sensorType struct for this sensor?

Originally submitted via email support on 25 September 2025. Migrated to the forum for community visibility.

2

Soldered Support:

Here’s the sensor type configuration for the SGX-OX-ROHS-LP oxygen sensor:

const sensorType SENSOR_OX = {
 5.0F, // nanoAmperesPerPPM (approx, based on 0.1 mA in air -> ~4760 nA per %vol; ≈ 4.76 nA/ppm)
 0.0, // internalZeroCalibration (oxygen has small offset; can be tuned after calibration)
 ADS_GAIN_2_048V, // adsGain (keeps sensor output within ADC range)
 TIA_GAIN_120_KOHM, // TIA_GAIN_IN_KOHMS (balances sensitivity vs noise)
 RLOAD_10_OHM, // RLOAD (common for SGX sensors)
 REF_EXTERNAL, // REF_SOURCE (external 2.5V reference)
 INTERNAL_ZERO_67_PERCENT, // INTERNAL_ZERO (best bias point for -600 mV)
 BIAS_SIGN_NEGATIVE, // BIAS_SIGN (datasheet specifies -600 mV)
 BIAS_24_PERCENT, // BIAS (≈ -600 mV with 2.5V ref → 0.24 * 2.5V ≈ 0.6 V)
 FET_SHORT_DISABLED, // FET_SHORT
 OP_MODE_3LEAD_AMP_CELL, // OP_MODE
};

This is based on the datasheet specifications for this oxygen sensor.

Attachment omitted in migration: ds-0549-sgx-ox-rohs-lp.pdf