SPO2 Sensor Probe for Pulse Oximetry - High Quality

Useful in sensing oxygen level of blood as well as heart rate. Original high quality, medical grade.

Product Code 4017

Available We dispatch same day if ordered by 1PM (excluding holidays), then courier usually takes 2-5 days.
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Ready Stock: 4 nos.
Factory Leadtime for more quantity: 15 days
SPO2 Sensor Probe for Pulse Oximetry - High Quality
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This sensor is useful in making Pulse oximetry, which is a test that measures what proportion of the oxygen-carrying molecules in the blood (called hemoglobin) are actually carrying oxygen. This is known as oxygen saturation or SpO2. One hundred percent oxygen saturation is attained when all hemoglobin in the blood is completely saturated with oxygen. This simple test does not require a blood sample and is called non-invasive. 

A pulse oximeter is a medical device that indirectly measures the oxygen saturation of a patients blood (as opposed to measuring oxygen saturation directly through a blood sample) and changes in blood volume in the skin, producing a photoplethysmograph. It is often attached to a medical monitor so staff can see a patients oxygenation at all times. Portable battery-operated pulse oximeters are also available for home blood-oxygen monitoring.


  • Pulse Oximeter
  • Heart Rate Meter
  • Plethysmograph

Note for Buyers: We had many queries from customers asking what this sensor consisit of and what we give with it. Want to clarify that this sensor is a probe which attached to finger as below for purpose of SPO2(Oxygen level in blood) measurement projects. Internally it consist of IR LED, Red LED and Light detector. Same has been brought out to DB9 pin connector as shown below in sensor internal connections. This probe is same as mentioned in Download area Texas App Notes. Probe does NOT contain any ADC or Opamp circuit internally. It has to be designed as per your application externally.

Internally to sensor are two IR and Red LED and Light Detector on other side. A finger pulse oximeter is composed of two light emmitting diodes (LED) for sensing blood volume and blood oxygen saturation in the finger.


The sensor is wires as below and connections brought out at DB9 type connector. It does NOT contain any ADC or Analog or Opamp inside.

At 0 % saturation, there is only deoxy Hb. The absorbance ratio ( i.e. comparing how much red light and infrared light is absorbed) will therefore be same as that seen with the de oxy Hb absorbance curve.

At 50 % oxygen saturation, the absorbance pattern is different to when the saturation was 75 %. The ratio of red light and infrared light absorbed is also therefore different and the pulse oximeter uses this to calculate the saturation as 50 %.

At 100 % saturation, the absorbance ratio ( i.e. comparing how much red light and infrared light is absorbed) will be same as that seen with the oxy Hb absorbance curve.

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