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Spo2 Sensors Difference exist
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How to test Spo2 sensor?
What's normal Spo2?
What's Spo2?
GE Spo2 probe-differ module
How to choose Spo2 sensor?
Digital&Analog spo2 sensor
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What's ECG?
ECG Color coding
Guide to put Electrode
Maintenance patient monitor
Maintenance patient monitor
Attention when use ECG Cable
How does Spo2 sensor work?
Skip to repair Spo2
Knowlege of NIBP Cuff
Principle Of Measuring ETCO2
ETCO2 Monitored Indications

Digital&Analog spo2 sensor 

  Digital spo2 sensor

There are two major schools of spo2 sensors in terms of working machenism:

1, Analog and digital;

When we refer to "analog" spo2 sensor, the spo2 sensor is equipped with a photodetector; and when we refer to "digital" spo2 sensor, it is equipped with a digital light-to-frequency converter.

Technical data are available in OSI company website and Texas Instruments website:

2, How to tell?

As you can read from the technical data, the appearance of the photodetector chip for analog and digital spo2 sensors are different;

  The active area (black part) of photodetector is much bigger and the light-to-frequency converter.

3. What for?

Now many Chinese OEM patient monitor manufacturers uses light-to-frequency converter as photodetector, such asContec, Meditech, Creative, Comen, Biolight, and their spo2 sensors usually more or less the same, for example Lemo 5 pins single notch connector spo2 sensors with digital spo2 sensor, usually works with Contec, Biolight, Meditech .... patient monitors.

So the photodetector is going to help you to decide what spo2 sensor to use. For example, Comen spo2 sensors usually 6 pins Lemo connector, single notch, however, the newer models usually use digital spo2 sensor, which is with light-to-frequency converter equipped, and the older models usually with analog spo2 sensors, so normal photodetector is equipped.

Conclusion: sometimes if you are not sure which sensor your monitor use, please take picture and send us the picture of photodetector to , it will help.

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