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Electronic Level Gauge for LPG – C-Flex

Rotarex ELG C-Flex is an advanced electronic LPG level gauge designed to provide accurate and reliable level measurement for LPG cylinders and fixed tanks. Engineered for precision and durability, it ensures clear visibility of remaining gas volume and supports optimized supply management.

Featuring a highly flexible capacitive probe, the system adapts to various gas cylinder and tank configurations, making it suitable for both steel and composite LPG containers. The electronic level indicator delivers consistent performance in residential, commercial, and industrial environments.

Compatible with standard fittings, the capacitive gauge includes a replaceable waterproof display that can be rotated for optimal readability. Its robust design and smart integration capabilities make it an ideal solution for modern LPG monitoring applications.

Key Features & Benefits

The Rotarex ELG C-Flex digital propane gauge is a high-quality product designed to provide accurate measurements, great installation flexibility and long-term reliability. It combines advanced capacitive sensing technology with practical features for safe and efficient gas management.

Superior accuracy

Compared to traditional mechanical solutions, which has limited precision, the Rotarex SRG digital capacitive gauge gives you an accurate and detailed measurement across the entire tank content. It provides superior accuracy +/- 1% (over full scale) compared to mechanical devices, eliminating any guesswork.

Hassle-free retrofit

Replace your old mechanical pressure gauge with a modern digital capacitive pressure gauge in just a few simple steps. Monitor your LPG (propane, butane) level easily with this advanced digital pressure gauge that integrates seamlessly into your existing installation. Plus, you can easily cut the sensor yourself to fit the exact dimensions of your tank, ensuring a perfect fit for your setup.

Enhanced reliability and durability

The absence of moving parts significantly increases the reliability and service life of the electronic level gauge. Unlike traditional manual float-based systems, there are no components that can wear out, jam, or deteriorate over time due to vibration, pressure variations, or repeated use.

Key Features & Benefits
Why Upgrade to Electronic LPG Level Measurement?

Why Upgrade to Electronic LPG Level Measurement?

By choosing innovative liquid level monitors and modern LPG level gauges, you can better track your gas consumption and enjoy greater peace of mind. Instead of relying on approximate readings or manual checks, you can accurately monitor the liquid level in your cylinder or tank at any time via your app, regardless of the tank type or installation setup.

With advanced level gauges, you always know how much gas you have left, helping you avoid unexpected shortages and plan your refills more efficiently. Backed by proven technical expertise, these solutions are designed to deliver reliable performance in everyday residential and light commercial applications.

By choosing a smart liquid level monitor, you benefit from clearer visibility, easier monitoring and a more convenient way to manage your LPG consumption.

No more stuck gauges with ELG C-Flex

No more stuck gauges with ELG C-Flex

With the C-Flex electronic level gauge, you eliminate the common risk associated with traditional mechanical gauges that can become stuck and distort level readings. Mechanical float systems rely on moving parts that may jam, wear out, or become blocked over time, leading to inaccurate results.

The C-Flex features a no-moving-parts design, meaning there is no mechanical mechanism that can get stuck. This ensures consistent, reliable, and accurate level measurement throughout the entire service life of the product.

C-Flex Electronic Level Gauge by Rotarex SRG

Monitor Your LPG Anytime with Rotarex Connect

By connecting your digital LPG level gauge to Rotarex Connect, the remaining gas levels in your cylinder or propane tank are transmitted directly to your smartphone in real time. As part of an advanced remote monitoring solution, the integrated high-precision capacitive level sensor provides continuous and extremely accurate readings (accuracy up to +/- 1% over full scale), far beyond traditional mechanical gauges.

This hyper-precise measurement allows you to track your LPG consumption with confidence, anticipate refill timing, and avoid unexpected shortages. Whether for home, leisure, or light commercial use, you always know exactly how much gas is left.

For even greater peace of mind, you can set customizable level alarms within the app. When the remaining gas reaches a predefined percentage, you automatically receive a notification, giving you enough time to plan your next filling and ensuring you never run out of gas again.

With real-time monitoring, smart alerts, and advanced accuracy, Rotarex Connect makes LPG management simple, precise, and fully under your control. Learn more about Rotarex Connect advantages.

Monitor Your LPG Anytime with Rotarex Connect
How does it work?

How does it work?

Our products use advanced capacitive sensing technology and a high-precision sensor to measure the liquid level inside the cylinder or tank. The electric sensing system ensures precise and reliable measurement in LPG applications. A flexible probe is easy to install vertically inside the container and continuously detects the difference between liquid LPG and vapour.

As the liquid and gas phases have different electrical properties, the system can accurately determine the position of the liquid level. The data is then processed and clearly displayed on the electronic indicator, giving you an immediate and reliable reading of the percentage of gas remaining.

Specifications
Electrical specificationsBattery CR2032 (3V)
Working pressure30 bar
Accuracy / resolution+/- 1%
Output signal0,5-4,5V ratiometric at 5V supply voltage
WiringJWPF - 3 PINS
materialsHousing: brass
Sensor: Stainless steel
Seal: NBR
Working temperature-25°C to +60°C
Connection to the tankJunior head with 4 screws
1" NPT
Atex certification according toStandards: IEC 60079-0 : 2017 (Ed. 7.0) & IEC 60079-11 : 2011(Ed. 6.0)
Code (e.g. Ex II T ): II 2 G Ex ib IIB T3 Gb
Class: Ui = 8 V; Ii = 220 mA; Pi = 0,7 W; C i = 2,9 F; Li = 0,1 mH
Certified max. outboard leak rate at max. pressure≤ 1 x 10-3 mbar.l/s
Type of gasLPG (propane, butane or mixture of these 2 gases)
Downloadable catalogs, brochures
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    ELG C-Flex
    Last update: Jul 30, 2025
    Available in: en
Frequently Asked Questions
How accurate is the electronic LPG level gauge?

The ELG C-Flex uses advanced capacitive sensor technology to deliver highly precise liquid level measurement, with an accuracy of up to +/- 1% over full scale. This provides significantly more reliable readings than traditional mechanical gauges.

How does Rotarex Connect work?

Once connected, the gauge transmits real-time level data to the Rotarex Connect app. The remote monitoring system allows you to track your gas levels, monitor consumption trends, and receive notifications directly on your smartphone.

Can I use the gauge with both LPG cylinders and tanks?

Yes. The flexible sensor probe is designed for installation in both LPG cylinders and fixed tanks. It can be adjusted to fit different container sizes for optimal performance.

Does the electronic sensor require maintenance?

No regular maintenance is required. Because the system has no moving parts, there is minimal risk of wear or mechanical failure, ensuring long-term reliability and durability.

Which gases are compatible with the electronic level gauge?

The electronic level gauge is specifically designed for LPG applications, including propane and butane. It accurately measures the liquid level inside LPG cylinders and tanks using capacitive sensing technology. For use with other gases or specific gas mixtures, please consult the technical documentation or notice to ensure compatibility with your installation.

What are the main advantages of the ELG electronic LPG level gauge?

The ELG offers several key benefits compared to traditional mechanical gauges:

  • High precision measurement – Accuracy up to +/- 1% over full scale for reliable level indication
  • Continuous monitoring – Real-time and uninterrupted level readings
  • Remote monitoring capability – Connection to Rotarex Connect for app-based tracking
  • No moving parts – Increased reliability and longer service life
  • Easy installation and retrofit – Compatible with standard fittings and adaptable probe length
  • Improved safety – Reduced risk of unexpected gas shortages
  • Smart level alarms – Custom notifications when gas reaches a predefined percentage

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