IoTClass / Inside the measurement
Conceptual · not to scale

Inside a MOX gas sensor

Peel from the case to the element. Follow the readout through this conceptual model.

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The full text version below describes every layer. All measurement explanations are available without 3D.
Case: mesh-topped gas-sensor canThe mesh can shown here is a teaching example that lets gas reach the sensor. Its mesh pattern and proportions do not specify a commercial package. [TGS 2600: sensing element description, page 1]

Drag to rotate; pinch to zoom. With the view focused: arrow keys rotate, + / − zoom, 1–3 choose a layer, Home resets rotation and zoom. Step advances to the next layer; Reset returns to the case and default view. Layer buttons select a view directly. The page does not move on its own.

Layer 1 of 3 / Outside

Case: mesh-topped gas-sensor can

The mesh can shown here is a teaching example that lets gas reach the sensor. Its mesh pattern and proportions do not specify a commercial package. [TGS 2600: sensing element description, page 1]

Teaching view: The silver mesh can surrounds the sensing parts. Its openings show where the surrounding gas reaches the sensor.

The measurement to rememberIn the TGS 2600 example, gas that the sensor can detect makes the sensing layer conduct electricity more easily. [TGS 2600: sensing element description, page 1]

Full text version · every layer

1 · Case: mesh-topped gas-sensor can

The mesh can is a teaching example that lets gas reach the sensor. Its mesh pattern and proportions do not specify a commercial package. [TGS 2600: sensing element description, page 1]

Teaching view: The silver mesh can surrounds the sensing parts. Its openings show where the surrounding gas reaches the sensor.

2 · Board / module: connections to the readout

The TGS 2600 measuring circuit uses a heater voltage and a circuit voltage. [TGS 2600: Basic Measuring Circuit, page 2]

The circuit measures the voltage across a load resistor connected in series with the sensor. [TGS 2600: Basic Measuring Circuit, page 2]

Teaching view: Four terminals extend from the sensor body to connect it to an external circuit. Let the sensor settle after power-on before using or calibrating its output.

3 · Element: heater and sensing layer

The TGS 2600 has a metal-oxide semiconductor sensing layer on an alumina support with a built-in heater. [TGS 2600: sensing element description, page 1]

In the TGS 2600 example, gas that the sensor can detect makes the sensing layer conduct electricity more easily. [TGS 2600: sensing element description, page 1]

Teaching view: The red track marks a heater, the pale tile an alumina support and the gold patch a sensing layer. The heater keeps the layer hot enough to sense gas. Gas that the sensor can detect makes the layer conduct electricity more easily; the external circuit turns that change into a voltage across the load resistor. These shapes and their arrangement are teaching examples; the source does not specify this internal layout.

Explode separates the conceptual layers; X-ray makes the case translucent. External package dimensions follow the model specification; internal teaching geometry is conceptual, not to scale, and is not manufacturer CAD or a wiring diagram.