tank monitor Image

tank monitor

Can someone tell me about resistance based sensorss ppl

I would like to know about resistance senders.

I have some on my boat for water and diesel.

These are rated in Ohms. In my case from 0-190ohms.

For my Raspberrypi running latest Venus Os, with a new GX tank 140 I have the option between Voltage or Current.

But Current is in 4-20ma not in Ohms

Can anyone explain this to a noob. I dont know enough about this but hope someone can inform me and others

Fraser Stewart asked
pwfarnell commented ·

2 Answers

GX Tank 140 shows a sensor value off 21474838.0V but is only 30mV

I have the gx Tank 140 to display the Tanksensor from comworks. It was functional but now it shows on all sensors error and the sensor value is 2147838.0V from the sensor with empty tank comes a voltage of 30mV. If I disconnect the sensor the value is 0V

At setup I have : Sensor type voltage, sensor value when empty 0,1V, sensor value when full 2,5V

I try to remove all sensors, restart, power down for 10min.

The firmware at Cerbo is on 2.73, I try also v2.80-24 but the same.

Thanks for any help


heinz0005 asked

0 Answers

Need help with new Gx tank 140 reading from combinoord resistive fuel sender. LOW VALUES or not?

Hoping I can get some advise or help. Warning, noob so please go easy.

I have managed to set up a RaspberryPi running Venus Os. I have all connected to mppt, inverter and battery monitor.

I recently purchased a GX tank 140. I have already got resistive based fuel senders from company Combi Noord. They have a range from 0-190 ohms. They have two wires.

So i have connected one wire to the 24v and one to the In as understood from the wiring diagram.

In Venus I have picked Current and not Voltage.

After doing this i only see values from 4-20ma. I dont see an option for Ohms.

So manually moving the float part of the sensor gives me readings.

HOWEVER (this is what i need your help with)

The reading range is very narrow.

The sender is 45cm long. At the bottom i see 17mA

And at the top. 20mA. I had expected 4mA at bottom of the sender shaft.

My father who has much more knowledge about electronics says that i would need to add a resistor of 250 ohms to get more range, i dont doubt his opinion. i do doubt though that Victron would make a plug and play device, the likes of the Gx tank 140, and then expect users to stick resistors in the terminals and then not write that in the supplied literature.

? Is this range, ie 17mA to 20mA, what i should expect ?

If so would not make it very inaccurate?

Is an ohms based sender intended to be used with the GX tank 140?

Is there a way to set Ohms values with the GX tank 140?

I hope someone out there knows more about this new product and can shed some light.


Fraser Stewart asked

0 Answers

Gx-tank 140 4 to 20

In the circuit diagram there is RL is this external?

What value?

see pdf gx-TANK 140 page 5

toftscot asked
pwfarnell answered ·

1 Answer

Cerbo GX Sensor Recommendations

I'm super excited to find that Cerbo GX can monitor my batteries, solar, AND tanks. My stock KIB sensors are nearly useless, reading 2/3 full until gray water starts coming up my drain, signaling 100% full. It's pathetic.

Does anyone know what sensors I can use that will give accurate level readings and work with Cerbo GX / GX Touch? I would like fresh, gray, black, and propane sensors that work with Cerbo GX.

Will this work? Do I really need 4 sensors for just the black tank?!? https://www.etrailer.com/dept-pg-RV_Sewer-pt-Probe_Sensors.aspx

childcarepro asked
rlp84070 answered ·

9 Answers

Cerbo GX Tank Senders - non Resistive Senders (Via - Analog/Dig Inputs)

I understand the tank sensor inputs accept Resitive type senders only. Unfortunately my black water tank is a different type of sender. See attached. It has three senders that send three separate signals; one for empty, half full and full.

I was told there is a way to customize the analog/digital inputs to interpret those signals.

Has anyone done this and can provide tips?

Thanks in advance


rlynch03 asked
rlynch03 edited ·

1 Answer

Cerbo gx with Tank Sensor CBE SPE

Hi there,

I like to install a Cerbo GX. I already hava a freshwater sensor, manufactured by CBE,(CBE SPE Drinking water electronic tankprobe)

looks, like it is resistive? but I don't find ist resistive range.

Does it work with the cerbo gx?

thanks for your help!

bitcrusher asked
devodave answered ·

1 Answer

CERBO GX Tank Level Sensor (KUS)


I have done hours of research on which tank level senders will be compatible with the CERBO GX. I found an old thread that listed these (https://kus-usa.com/product/sss-ssl-sender/) as compatible without any adapter. Meaning, I could wire them directly to the CERBO. However, I am not getting any signal and the CERBO simply says (Not connected). Do I need the CANbus adapter for these to work?



Thank you!

aopsahl7 asked
sarahb commented ·

3 Answers

Victron Cerbo GX and Schaudt Stabtanksonde

Hi all,

my EBL 99 from Schaudt has been replaced.The EBL no longer worked properly.
Now i have those existing tank probes.

Is it possible to conncet those with a Cerbo GX or do i need something else?
Maybe replace the tank probes?


Thanks Sascha

sascha78 asked
sascha78 commented ·

1 Answer

No Analog inputs shown on cerbo gx.

Originally was showing temperature and tank options in menus. While installing resistive tank sensors the cerbo GX rebooted. now all analog options are blank. The tank over view page shows no tanks connected and no options for temperature sensors available. How can I get those items to show again? It seems like the cerbo GX hardware may have faulted out.

jayoung asked
svaeolus answered ·

1 Answer

How do I add tank monitors to my Victron Color Controller?

I hav the Victron Color controller monitoring my Multiplus, BMV and Blue Solar controller in my RV. I would like to add tank monitoring through the color controller. Do I need to purchase a whole new tank monitor system, or is there a way to use the existing resistant based monitor wires? Is there any documentation or resources for adding tank monitors to the Victron Color Controller?

Steve Mullins asked
brinx38 answered ·

4 Answers

GX Touch 50 stopped working (blank) after Tank 140 is connected

I have a Cerbo GX, GX Touch 50 and Tank 140 with 4-20 mA sensors connected to ports 3 and 4 on the Tank 140. My understanding is this should work using the USB connection to the Tank 140 as the power source.

I set it all up in May and the system worked for a few days, displaying tank information correctly and the GX Touch 50 provided the expected interface. Then the GX Touch 50 stopped working (blank screen, doesn't seem powered).

I returned the Cerbo on RMA and just received a new one. I commissioned it plugging in one device at a time (starting with the GX Touch 50, which worked when initially connected). After connecting the BMV-712 and Multiplus Compact (all okay), I then plugged in the Tank 140 and the Touch 50 screen immediately shut off and won't work now, despite reboots and regardless of whether the Tank 140 is connected or not.

From the web interface, the Cerbo otherwise seems to be working fine, and when the Tank 140 is connected I can see the tank data as expected. But the Touch 50 won't come back. Any ideas?

michael-delage asked

0 Answers

How to connect seelevel tank monitor to Cerbo?

I have been following @kwindrem posts and purchased the recommended Seelevel 709 system in the hopes of connecting to my Cerbo. I also ordered from digikey the 3m connector. I used an ethernet cable and cut off one end and am connecting it to the connector. After reading the latest GitHub I installed the newest Cerbo Venus beta update which should be able to read the seelevel. After connecting the Seelevel to the VE Can Port on the Cerbo I am not seeing any tank readings. Is there's some setting I need to change or maybe it's the connector is bad. Anyway any input would be great.

For reference the 3m connector I purchased has labeled 1-4. Using a standard ethernet patch cable the connections are as follows:

1 - white/green

2 - orange

3 - orange/white

4 - green

Noah Taylor asked
md-canada edited ·

0 Answers

Current state of RV-C tank monitors like SeeLevel II 709-RVC

What is the current state of support for something like the SeeLevel II 709-RVC CAN bus tank monitor?

md-canada asked
Kevin Windrem commented ·

1 Answer

Oceanic System - 3271 Volumetric Tank Sender NMEA not recgonised on the Colour GX

I have a Colour GX connected to NMEA system alongside an Empirbus on a Narrowboat and the water tank level was successfully shown on the colour display using the NMEA CAN adaptor. The water tank sender I believe is the Oceanic System/offshore dynamcis 3281 (Volumetric Tank Sender). This has been working successfully for 4 years and I noticed with recent update this has stopped appearing coinciding with a rewiring job.

I have checked on the Empirbus logs and the tank level sender is transmitting with the FluidLevel PGN and tank sender id. However, the source address is now 255, which seems strange.

Given that there is more NMEA integration with the ColourGX, I am wondering if this has had an impact.

Do you have any suggestions?

Many Thanks,


Luke Parry asked
Luke Parry answered ·

1 Answer

GX Tank 140 - How to connect sensors?
I've just purchased a GX Tank 140 for connection to a Cerbo CX, as my VDO tank sensors output 4-20mAh.

I've tested the setup using channels 3 and 4 (which supply 20vdc), and it works fine with direct wiring to the sensors.

Q: Is it possible to use the boat's existing wiring, which has a common ground (negative, black), and the only cable directly available is the positive, and if so, how to I connect this to the Tank140?

(The original setup consists of a VDO meter and a switch, which connects +12vDC via the meter to the only available cable (red). I'm trying to avoid having to run extra wires)

rhercz asked

0 Answers

Connect CCGX to SeeLevel N2K tank monitor interface

I apologize if I missed something already posted, but I’m trying to connect an N2K SeeLevel Tank monitor to a CCGX.

I am a bit confused as to what I physically need to facilitate this connection.

I have no other N2K “network” or system in place, and only have the CCGX and the SeeLevel (N2K enabled) controller head.

Is there a cable I can buy (or pinouts for a cable I can make myself) to connect these devices directly to each other?

There was a reference made by @mvader (Victron Energy)


as follows:

For clarity, the “Victron N2K adapter to which @ben refers is just a plug converter goes from micro-c n2k style to RJ-45 Victron VE.Can style.

No electrical components or software in there.

which makes me wonder if I can connect them directly??

Your help is greatly appreciated


geomz asked
Paul B commented ·

1 Answer

Tank level sensor update interval is too slow on Venux GX

I have a resistive tank level sensor (similar in design to this one) installed in a header tank, and connected to a Venus GX. It works fine so long as the tank level is relatively static - however, if the tank level is rapidly rising or lowering, the Venus can't seem to keep up.

So for example, if I turn on the pump to fill the header tank, it is overflowing by the time the Venus is even reading 80%. Once I turn the pump off, the Venus reading continues to tick upwards gradually until finally reaching 100%, but this seems to take a few minutes to catch up.

Because I want to use this reading to control the pump, it is obviously an issue. I'm fairly sure it's not the sensor, since connecting a multimeter and actuating the slide manually seems to produce instantaneous change in the resistance reading. Is there a way to get the Venus to update the reading more rapidly?

aeneby asked
matteo-fossati commented ·

5 Answers

Power source for GX Tank 140

I purchased a GX Tank 140 along with 4 Safiery Ultrasonic Tank Sensors. The sensors require 12v, and my question is twofold. First,I have a 5th wheel with a victron multiplus and 4 lithium batteries and monitor with a CCGX. Can I connect my Tank 140 to my RV 12v system, and how do I regulate the four sensor inputs to all be 12v? As I understand the setup, inputs 1 and 2 require an external 12v power supply (can I use battery?) and inputs 3/4 are 24v and that is supplied internally from the Tank 140 (as I understand it).

mark-mcpadden asked
Kevin Windrem answered ·

1 Answer

Cerbo GX and tank level

My CerboGX show the tank level as %

Right now 18% of 200 liters = 36 literes.

How can I get it to show Liters and not %


henrikvj asked
Kevin Windrem answered ·

2 Answers

VE.Can resistive tank sender adapter - Naming tanks

Hello. I installed two tank sender adapters to Cerbo GX. These are addition to the four tank inputs on Cerbo GX, so in total 6 tanks. The firmware of the Cerbo GX is v 2.66. I could name the four tanks installed on the Cerbo GX directly. But, I could not name the two tank sender adapters. Is there a way to do it ? There is a menu to change the name, but even after making the change, the name is not saving.

Another question is the devices in the device list. Is there a way to put them in order according to our wish ?

Thank you in advance.

Gonenc Ozkul asked
Gonenc Ozkul commented ·

0 Answers

GX Tank 140 & BEP TS1 Ultrasonic Tank Sender

It looks as though the BEP TS1 Ultrasonic Tank Sender would be compatible with the GX Tank 140, but I would appreciate someone confirming before I order.


jokani asked
pwfarnell edited ·

3 Answers

'Tank overview' page with Cerbo GX tank level inputs only

In the manual for the GX Tank 140 there is a beautiful 'Tank overview' page that can be enabled. The Cerbo GX have four tank level inputs that I want to use and I don’t want to add a separate GX Tank 140.

Can the 'Tank overview' page be enabled when I just use the Cerbo GX tank level inputs and don’t use the GX Tank 140?

Or must the the GX Tank 140 be connected to the Cerbo GX to be able to activate the Tank overview' page?


djingis asked
mvader (Victron Energy) commented ·

4 Answers

GX Tank 140 Sensor Voltage

I have 3 tank sensors that require a 10-12V power supply. On the GX Tank 140 it looks like channels 1 and 2 use an external power source. Does that mean that I need to purchase two GX Tank 140s? Or, can channels 3 and 4 be used with ground only using an external power supply?

rvjeepguy asked
Kevin Windrem answered ·

1 Answer

Tank 140 overview option not available in display and language page on the touch 50 display

Hi all, have installed tank 140 but do not have the option to enable the tank overview in the display and language section …. Please help.

merlin asked
merlin commented ·

1 Answer

Looking for input - 4 to 20mA and 0 to 10V senders

Hello Community!

We’re considering to add a USB accessory to our GX product range, to add 0 to 10V, as well 4 to 20mA inputs.

But since all of us have very limited experience with 4 to 20mA tank senders, we're looking for some input:

  1. Is it always 4mA = tank empty, and 20mA is tank is full? Or do the empty and full levels need to be configurable in a software setting on the GX Device?
  2. And how important is it that the transducer can be powered by our device?
  3. Anything else we should keep in mind when designing a 4 to 20mA input? Good features you have seen else where?

Also, if you are using 4 to 20 mA senders, please post a link to a datasheet or specs below. And if you have an opinion on the sender, what you like/don't like, welcome to add that.

Lastly, most questions above are for 4 to 20mA, not for 0 to 10V - but if you have special comments about 0 to 10V, welcome as well - obviously. The product we have in mind will have inputs that can be used for both types.

Note, that this is quite early in the product development, I can’t say anything for now with regards to availability dates.

All the best and thank you! Matthijs

ps. just to prevent any question about this: we'll soon launch a new Venus OS version that can work with irregular tank shapes, as well as naming tanks and some more features: all those features will also available for the 0 to 10V and 4 to 20mA inputs. Details here.

mvader (Victron Energy) asked
leverg answered ·

13 Answers

Colour Control Fuel Tank Level

I have a generator with a smart controller which gives me my fuel tank level. My question is would I be able to connect that to the Colour Control GX directly or would I need a sensor?

Hannes Swart asked
wkirby answered ·

1 Answer

Can multiple GX 140 Tank Module connected to the Cerbo GX?

This is an information post.

If you are needing more than 4 tank inputs, we have tested with 12.

2 x GX Tank 140 and the 4 native inputs.

Our voltage based tank level input sensors are either differential pressure or ultrasonic under tank.

There are also LPG tank sensors that are voltage based. All 12 tanks appear on the Cerbo Tank display. Pic attached.

For fewer that 12 it would be easier to see...Watch video on Youtube search Safiery. Cheers


safiery asked
safiery answered ·

1 Answer

GX Tank 140 can it work on ground and signal inputs only

If I have level sensors already wired in to my 12V system with 0-10V outputs, can I connect just the signal wire and ground from my sensors to the GX Tank 140 and not take the 12V power from the unit.

pwfarnell asked

0 Answers

Tank level averaging period

Hey all!

Im running a cerbo gx in my van. I added a small water tank (37l) with a tank sensor, which is connected to the tank probe input of the gx. I noticed that the smoothing period in the gx for the tank values is very long, im guessing at least 10min. Due to the fact that the tank is small, i could empty it twice in that timeframe.

I did my research in the forum but couldnt find an answer: Is there a way to adjust the low pass filter? I sshd onto the device, but couldnt find a matching configuration.

Thank you!



Erik Sporns asked
Erik Sporns commented ·

1 Answer


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