Below are the recommendations and precautions for the special offer SSI oxygen probes and the original Marathon MMI probes, for your reference:

1. Core Product Information

SSI Oxygen Sensor

Brand: SSI (Special Sensors Inc.) is a renowned U.S. manufacturer of gas sensors, famous for its high-precision industrial oxygen probes.

Application: Suitable for oxygen content monitoring in high-temperature environments such as metallurgy, heat treatment, and glass furnace.

Features: High temperature resistance (up to 1400°C), quick response, long lifespan (ZrO2 sensor).

Marathon MMI Probe

Brand: Marathon, under Emerson's umbrella, specializes in online gas analysis.

Model: The MMI series is an original imported probe, commonly used in combustion control and environmental emissions monitoring (such as CEMS systems).

Advantages: Strong anti-interference, high stability, supports multi-gas detection (optional modules for CO, NOx, etc.).

2. Procurement Recommendations

After verifying the model suffix (e.g., MMI 200/300), match your equipment interface (e.g., 4-20mA, Modbus output).

Technical specifications confirmation

Range: Common for SSI probes is 0.1%~25% O2, MMI may be wider (0.001%~100%).

Temperature Compensation: Confirm if the probe is equipped with an internal temperature sensor to avoid high-temperature errors.

Inquire about calibration cycle (typically 6-12 months) and supply status of replacement parts (such as reference electrodes, filters).

Compatibility Test

If replacing an old probe, verify the installation dimensions (such as thread specification NPT/Metric) and ensure the signal output is compatible with the existing instrument.

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