question

knut-vidar-paulsen avatar image
knut-vidar-paulsen asked

What Temperature sensor can I use with the Cerbo?

  • Hi, is there available information on what type of temperature sensor can be used on Cerbo? Thanks Knut
cerbo gxTemperature Sensor
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6 Answers
Stefanie (Victron Energy Staff) avatar image
Stefanie (Victron Energy Staff) answered ·

From the Victron GX product range information it should be the QUA/PMP/Venus GX temperature sensor (ASS000001000). Not to be confused with the BMV temperature accessory.

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Stefanie is correct, I will also add it to the Cerbo GX manual.

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squarej avatar image
squarej answered ·

I want to monitor a refrigerator's temperature. Must this be connected to the negative of the battery and if so can I just supply that with an additional wire connected to the "nose" of the sensor?

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Hi @SquareJ

You do not need a connection to anything, just the two wires from the sensor have to be connected. the metal part of the temperature sensor is isolated.

Do not mix up the sensor available for the BMV 7x2, they are not isolated!.

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squarej avatar image squarej Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

Fantastic, thank you.

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alnavasa avatar image
alnavasa answered ·

I’ve watched the video regarding victron temperature sensors, abs I have a couple of questions when connecting them to the cerbo gx.


I’ve seeing on the video that it does have polarity, can’t find any polarity indicator on the cerbo gx to which is positive or negative.


Also I am planning to put one temperature sensor, on the engine of the boat, would there be any issue because the engine es negative ground power, and the sensor will touch it?

Or the eye faston is totally electrically isolated from the sensor?

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justmurph avatar image justmurph commented ·

I just took a stab at it and connected the red wire at the front (top) and black at the back (bottom). That works.

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os2dude avatar image os2dude justmurph commented ·
On my CERBO the top of the case has the names of each input printed. It also shows DATA for the top row and GND for the bottom. DATA = POS, GND = NEG.
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gertjand avatar image
gertjand answered ·

Hi An old topic but a have a related question. If I want to monitor temperature in eg.g. the engine compartment. Which sensor can I use for that. The one mentioned above seems to be for battery mounting (ASS000001000). Can these be used as well ASS560002005 Or anything else but not a battery mount version?

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It is fine to use this same sensor - ASS000001000 - for the Cerbo GX without mounting it to a battery.

It LOOKS like it's meant to be battery mounted, but will work anywhere, and does not need the battery.

https://www.victronenergy.com/live/temperature_sensors

You cannot connect ASS560002005 to the Cerbo.

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gertjand avatar image gertjand Guy Stewart (Victron Community Manager) ♦♦ commented ·

Perfect! Thx

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rlynch03 avatar image
rlynch03 answered ·

Has anyone successfully used these types of temperature sensors with the Cerbo GX?


4cd22dcf-1fcd-414f-a409-22c08e5e8288.jpegImage Caption




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Kevin Windrem avatar image Kevin Windrem commented ·
These appear to have digital outputs, so no they won't work.

The chip inside the Victron sensors is an LM335. I made my own sensors and waterproofed them with heat shrink tubing sealed at the end with a pair of pliers while the heat shrink was still hot.

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rlynch03 avatar image rlynch03 Kevin Windrem commented ·
Kevin... Thanks. Can you provide the materials you used to make them?
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Kevin Windrem avatar image Kevin Windrem rlynch03 commented ·

These would work but aren't the only option.

https://amazon.com/Juried-Engineering-LM335Z-NOPB-Temperature/dp/B08JZDTCY7

https://www.amazon.com/Wirefy-Heat-Shrink-Tubing-Adhesive/dp/B08W9JT93H

https://www.amazon.com/Wirefy-Heat-Shrink-Tubing-Adhesive/dp/B08W8K32VV

Use short pieces of the small heat shrink over the two wires you'll run from the sensor to the GX device (aka Cerbo).

Shrink these to insulate the three leads of the LM335 from each other.

Use a long length of the larger heat shrink over the sensor and extend as far as you need the assembly to be waterproof. Leave 1/2" of heat shrink past the end of the LM335.

Shrink the tubing it's entire length, then while the tip extending past the end of the LM335 is still hot, squeeze it together with a pair of pliers.

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bitcrusher avatar image bitcrusher Kevin Windrem commented ·

Thank you very much!

Which of the three pins do you connect to the cerbo?

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Kevin Windrem avatar image Kevin Windrem bitcrusher commented ·

You connect + and - to Cerbo. I believe the top pins are +.

Data sheet:

https://www.ti.com/lit/ds/symlink/lm135.pdf?ts=1632383765562&ref_url=https%253A%252F%252Fwww.google.com%252F

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rlynch03 avatar image rlynch03 Kevin Windrem commented ·
This works like a charm. Appreciate the tips.
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kai-fuchs avatar image kai-fuchs rlynch03 commented ·
I tried to build my own sensors as well, but they all seem to have an offset of roughly +5 degrees. did anyone come across this issue? I know the LM355 is calibratable but I'll need to check how
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klim8skeptic avatar image klim8skeptic ♦ kai-fuchs commented ·
@Kai Fuchs You can adjust the temp offset in one of the GX menus.
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kevgermany avatar image kevgermany ♦♦ klim8skeptic ♦ commented ·
This seems to be not universal. Can't be done on my CCGX.
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kai-fuchs avatar image kai-fuchs kevgermany ♦♦ commented ·
Hey thanks for the hint. I found it in the manual but it states: it’s only available for “super users”. Anyone know how to get a super user?


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Guy Stewart (Victron Community Manager) avatar image Guy Stewart (Victron Community Manager) ♦♦ kai-fuchs commented ·

Hi @Kai Fuchs

The process for get super user access is described here

https://www.victronenergy.com/live/ccgx:root_access

Please read all the warnings carefully.

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kai-fuchs avatar image kai-fuchs Guy Stewart (Victron Community Manager) ♦♦ commented ·
Thank you
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yep avatar image
yep answered ·

There is another fine solution: https://ruuvi.com/ruuvitag.

Cheep, accurate, easy to connect (BT).

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