SEK-SVM4x – Quick Start Guide© Copyright Sensirion AG, Switzerland

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Version 1.0
Stäfa, October 2021

Contents
1.

Connecting your SVM41 to a computer

2.

Plug and Play with ControlCenter3.

Measuring RHT

4.

Measuring VOC

5.

Triggering events

6.

Changing the temperature offset (expert mode)

7.

Set the tuning parameters for the VOC Index (expert mode)

8.

Using the memory feature for the VOC Index (expert mode)

9.

Restarting the SVM41 with the new parameters (expert mode)© Copyright Sensirion AG, Switzerland

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2Connecting your SVM41 to a computer
USB portcomputer
Windows/Mac/Linux

USB-UART cable(included in SEK-SVM4x)

SVM41(included in SEK-SVM4x)© Copyright Sensirion AG, Switzerland

SEK-SVM4x landing page

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Get ControlCenter software…
Download the recent version of ControlCenter for Windows, Mac, or Linux and install it. When launching thesoftware, you should see the SVM41 appearing in the list of connected sensors.

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…and start using it
Now you are good to go for starting your first measurement by pressing the Start button.

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Measuring RHT
The results of temperature (left panels) and humidity (right panels) are displayed under the tab “RHT”.
temperature© Copyright Sensirion AG, Switzerland

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relative humidity

Measuring RHT
The upper panels show the values including temperature compensation. This is used, e.g., to compensate selfheating effects by the PCB. The temperature offset used for this compensation can be adjusted (see later).

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Measuring RHT
The lower panels show the values without any compensation.

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Measuring VOC
The results of VOC are displayed under the tab “VOC”. The upper panel shows the processed VOC Index while
the lower panel visualizes the VOC raw signal (i.e., resistance of the MOX layer).

VOC Index

VOC raw signal© Copyright Sensirion AG, Switzerland

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Measuring NOx
The results of NOx are displayed under the tab “NOx”. The upper panel shows the processed NOx Index while
the lower panel visualizes the NOx raw signal (i.e., resistance of the MOX layer).

NOx Index

NOx raw signal© Copyright Sensirion AG, Switzerland

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Measuring VOC/NOx
You may notice that upon each restart, the VOC/NOx Index output will be 0 for 45 s. This blackout time is normal
and required by the sensor and Gas Index Algorithm to deliver first reliable data.

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ConfidentialReady for some events?!
Try the following:• Place the SVM41 on top of a glass filled with water(but do not let the SVM41 touch the water)→ How does it affect the RH signal?

• Hold the SVM41 between your closed hands→ How does it affect the T signal?
• Hold a text marker next to the SVM41(preferably close to the SGP41 without touching it)→ How does it affect the gas signals?
• Exhale onto the SVM41→ How does it affect all signals?

© Copyright Sensirion AG, Switzerland

ConfidentialReady for some events?!

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Try the following:• Use a gas lighter without igniting the flame and holda glass on top of it before putting the SVM41 into theglass. This will release VOC gas.
→ How does it affect the VOC and the NOx signals?

• Use a new glass and now ignite the flame, remove
the lighter, and put the SVM41 into the glass. Thiswill produce NOx.
→ How do the gas signals look like now?

Caution: Use only temperature-resistant glass. Do
not perform the test next to flammable products.
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As you are an expert now you, may want to dig a little deeperFirst, stop the measurement by clicking the Stop button (1). Subsequently, press on the gear wheel next to theSVM41 in the sensor list (2).
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Changing the temperature offset
You can change the temperature offset by entering a new value
under the Device Parameters section and subsequently pressing
the Apply button (1).
You can check if such compensation is needed by comparing thetemperature raw value of the SVM41 with the temperature
measured by an SHT on an FPCB (e.g., from a SEK-SHTxx)
when placing both next to each other. The difference between
both sensors is the temperature offset.
If you want the temperature offset to be saved permanently on
the SVM41 press the Store button at the bottom (2).

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12Set the tuning parameters for the VOC/NOx Index
There are six different parameters which can be set by the user
to influence the behavior of the Gas Index Algorithm. For eachparameter, you can place the cursor on top of the i icon toreceive more information about it (incl. default values in case youforget).
Enter the values in the fields keeping them within Min and Max
ranges (1). Feel free to play with the parameters; you cannotdestroy anything. Confirm the settings by pressing the Apply
Algorithm Parameters button (2).

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If you want the tuning parameters to be saved permanently on
the SVM41 press the Store button at the bottom (3).
For more information, please, consult the application note
Sensirion’s VOC Index for Indoor Air Applications.
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Using the memory feature for the VOC Index
After restart, the VOC Algorithm on the SVM41 normally forgets
everything which had been previously learned.
By checking the box next to Memory-Feature enabled, the VOC
Algorithm remembers previous data and avoids the situation thatthe algorithm needs to learn from scratch.
Note: this feature must only be used for short interruptions(≤10 min). For more information, please, consult the applicationnote Sensirion’s VOC Index for Indoor Air Applications. Thisfeature is only available for the VOC Index and not for the NOxIndex.

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Restarting the SVM41 with the new parameters
Press the Done button (1). The configuration window will close automatically. Subsequently, press the Start
button in the main window (2). All set parameters will now be applied for the new measurement.
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