Victron GX Tank 140: Setup & Analogue Sensor Guide

Key Takeaways

• The Victron GX Tank 140 Interfaces with either 4 to 20mA or 0 to 10V tank level sensors (including a combination of both) across 4 analogue channels.
• Connects directly to Cerbo GX, Ekrano GX, or Venus GX controllers via a Connection to the GX Device via USB interface with a GX Tank 140 unit with non-detachable 1.5 meter cable.
• Channel 1 and 2 use a fused power source from the V in connection for sensor excitation from an external DC supply.
• Channel 3 and 4 use an integrated 24V power source for sensor excitation, which is powered via the USB interface, eliminating auxiliary power bricks.
• The integrated 24V power source simplifies the installation/wiring process, as no additional power source is required for standard 2-wire 4-20mA current loop senders.
• Features a Configurable input range, for example to connect a 0 to 5V sensor for customized pressure and level transmitters.
• Includes a Configurable averaging filter (1 to 60 seconds) to dampen the effect of fluid movement in mobile marine and RV tanks.
• Monitors signal health: In case the measured voltage/currents exceeds the limits (voltage: >10V, current: <4mA or >20mA) an error will be triggered.
• Protected by a Five year limited warranty This limited warranty covers defects in materials and workmanship in this product, and lasts for five years from the date of original purchase of this product.

Module Overview & Channel Power Architecture

The Victron GX Tank 140 expands Venus OS system controllers by adding 4 precision analogue sensor input channels. It allows commercial solar, marine, and off-grid facilities to monitor fuel, fresh water, greywater, and industrial fluid levels alongside electrical storage metrics.

The Victron GX Tank 140 provides a 4-channel analogue interface (4 to 20mA / 0 to 10VDC / 0 to 5VDC) with a non-detachable 1.5m USB cable for plug-and-play connection to GX devices:

• Channels 1 & 2 (External Supply): Fused V in Excitation, Connects 0-10V / 4-20mA Senders, Pluggable Terminal Blocks.
• Channels 3 & 4 (USB 24V DC): Integrated 24V Power, No Extra Power Supply Req., Powers 2-Wire 4-20mA Loops.

Sensor Excitation Setup

• Channels 1 & 2 (V in Fused Power): Channel 1 and 2 use a fused power source from the V in connection for sensor excitation. When powering 12V or 24V senders from the main battery bank, connect external DC positive to the V in terminal.
• Channels 3 & 4 (Integrated 24V Supply): Channel 3 and 4 use an integrated 24V power source for sensor excitation, which is powered via the USB interface. Because The integrated 24V power source simplifies the installation/wiring process, as no additional power source is required, these channels are ideal for 2-wire industrial 4-20mA hydrostatic pressure senders.

Sensor Wiring & Voltage / Current Configuration

The GX Tank 140 terminal blocks accommodate both voltage-output and current-loop transducers:

Venus OS Damping & Fault Diagnostics

Configuring the GX Tank 140 in Venus OS (Settings -> Analog inputs -> Tank inputs) provides software-level tuning and automated alarm triggers:

• Fluid Movement Damping: Sloshing in marine and mobile vehicle tanks causes erratic level fluctuations. Activating the Configurable averaging filter (1 to 60 seconds) to dampen the effect of fluid movement provides smooth, stabilized volume readings.
• Fault Threshold Alarms: In case the measured voltage/currents exceeds the limits (voltage: >10V, current: <4mA or >20mA) an error will be triggered. An open-circuit wire fault drops the current below 4mA, immediately alerting the operator.
• Tripped Fuse Behaviour: In current-sensor setups, The internal self-resetting fuse has a permanent current flow of ~11 to 13mA when tripped and the GX Tank 140 cannot detect this state as a fault, resulting in a stuck reading around 40% to 55%. If this occurs, inspect field wiring for short circuits.
• Warranty Backing: The unit includes a Five year limited warranty This limited warranty covers defects in materials and workmanship in this product, and lasts for five years from the date of original purchase of this product.