question

neil-mclaughlin avatar image
neil-mclaughlin asked

Cerbo GX Water Tank Level Sensor Recommendations Needed

Hi Folks,

I am excited about the tank monitoring capabilities of the Cerbo GX but I see so many different and highly technical posts. I really am hoping that by now there is a "plug and play" recommendation. I have three fresh water tanks and would prefer outside sensor install but whatever is proven and most accurate. I have access to all tanks from the top and sides. I also have the Cerbo connected to a BMV-712 and a Multi-plus inverter by the appropriate wire cables and then on to the Raymarine Axiom Pro(where I will hope to read the water levels in addition to the phone app or VRM).

Appreciate your recommendations.

Neil

cerbo gxtank monitor
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10 Answers
dfraizer avatar image
dfraizer answered ·


I have a similar setup and I installed senders by KUS USA. I am monitoring water, waste on my cerbo GX and plan on adding a KUS USA analog/digital sender for fuel so that I can monitor fuel via my nemea 2000 network on my axiom pro. I tried a bunch of senders and the KUS USA are the easiest to install. Great to deal with

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luis-gomezcala avatar image
luis-gomezcala answered ·

Hello from Dublin,

I have a similar setup as yours, the best option would be a pressure sensor which can be plugged in outside your tank in the pipeline. The problem is Victron only supports resistive tank sensors fitted inside the tank or external which are rather expensive. However, if you get in contact with Oceanic systems in the UK (manufacturer of Victron resistive senders) then you will be able to get a 4 20ma pressure adaptor which interface with your Cerbo directly. I wished I knew this before purchasing the very expensive Victron sensors. Here is the link:

https://osukl.com/pressure/

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mvader (Victron Energy) avatar image
mvader (Victron Energy) answered ·

Hey all, within 2 to 4 weeks we’ll be shipping the first batch of our new GX Tank 140.


GX Tank 140 is an accessory to be used with a Victron GX device. It can connect up to four tank level sensors with an output between 4..20mA or 0..10V. Connection to the GX Device via USB.

Highlights:

  • Channel 1 and 2 feature a fused power supply from the Vin connection terminal; requires an external power supply
  • Channel 3 and 4 feature a built-in 24V power supply for the tank sensor. Power is coming from the USB.
  • Configurable upper and lower limits, use this to connect (for example) a 0 to 5V sensor.
  • Configurable averaging filter (1 to 60s) to dampen fluid movement.
  • Faulty sensor detection: when values are out of range an alarm will be raised.
  • For marine applications: yes the GX Device can transmit these tank levels out on N2K network to be picked up by other displays such as an MFD. For details, search for NMEA2000-out in the Cerbo GX manual.


End-user C EUR price ex VAT is EUR 100



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Wes Humpage avatar image
Wes Humpage answered ·

Just purchase a 0 to 5 psi sensor from eBay

$26 each

Wire the ground to the lower terminal and the positive the top terminal (next input along) and the sensor wire to the top terminal (input)

Just use the custom sensor setting to set you scale, if the impedance of the sensor takes your measurement outside of the Cerbo input just use some resistors to either pull up or pull down the sensor wire (normally a 1k ohm will do it)


it’s really easy. I have 4 setups (8 tanks) running like this

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jesseafuchs avatar image
jesseafuchs answered ·

I apologize if this is a basic question but Im still trying to compile all of the vast victron knowledge.

Will this bad boy be able to assist in connecting the Garnett Seelevel Tank Senders to the Cerbo for monitoring?

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pau1phi11ips avatar image
pau1phi11ips answered ·

Just search for this on eBay, there's loads are different lengths:
"water level sensor 0-190 ohms"

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Rene Mullie avatar image
Rene Mullie answered ·

I did some testing with various sensors; the best solution and plug&play level sensor for the GX Tank 140 is this differential pressure sensor:

https://www.aliexpress.com/item/4000096662581.html?spm=a2g0o.9042311.0.0.22d14c4dshbEiI

A well made stainless steel heavy IP68 housing, output 4-20mA 24Vdc power directly from GX Tank unit. Connect red cable from sensor to 24V output on GX Tank, black cable to IN; set Cerbo to right sensor type (4-20mA) and it is operational! Price: 42euro

Very accurate; I installed the 0-1M version in a 35cm high 111L fresh water tank on my RV and, after calibration, it is so amazingly accurate; less than 1L accuracy to the last cm of water in the tank!

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thegrandpoohbah avatar image
thegrandpoohbah answered ·

Just to be clear....the 5 psi pressure switch that Wes used was connected directly to Cerbo GX???

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Thierry Cortassa (Victron Energy Staff) avatar image
Thierry Cortassa (Victron Energy Staff) answered ·
  1. I did some testing with various sensors; the best solution and plug&play level sensor for the GX Tank 140 is this differential pressure sensor:
  2. https://www.aliexpress.com/item/4000096662581.html?spm=a2g0o.9042311.0.0.22d14c4dshbEiI

i test it in a 1600l water tank and it's look very good and simple to instal !

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Wayne avatar image
Wayne answered ·

Hello from New Zealand

I'm using the new tank 140, which is plug and play with the sensors available from Safiery in Australia.

I have a pressure sensor running on my fresh tank, about to instal a pressure on my genset fuel tank, and two ultrasonic bottom mounts one on the grey waste tank and one on the RV diesel tank, I love that they are plug and play, the ultrasonic works on composite and steel tanks, I'm doing the diesel tank as we park for periods in the winter and our heating is diesel from the truck tank so I like to be able to monitor without having to go to the cab.

https://www.safiery.com/tanks

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