login

Insulation Gas

DILO is a global leader in gas handling technology, specializing in both SF6 and new alternative gases used in high-voltage (HV) applications. As the HV industry shifts from relying solely on SF6 as an insulation gas to adopting more environmentally friendly alternatives, DILO stands at the forefront of this transition. The company provides advanced equipment, services, and expertise that ensure safe and efficient gas handling, measurement, treatment and even reconditioning. DILO is driven by its commitment to sustainability and innovation in the energy sector.

  • Measuring Devices
  • Gas Handling Equipment
  • Gas Treatment & Reconditioning
  • DILO Accessories & Couplings

Measuring Devices

Multi-Analyser SF6

With its innovative equipment and intuitive user interface, the MultiAnalyser SF6 meets the user’s requirements and is ready for operation immediately after switching on. High-quality manufacture and ergonomic design guarantee the quality standards for a compact and maintenance-friendly measuring device with high measuring accuracy. This multi-functional measuring device allows the emission-free determination of up to six measuring parameters with only one sample.

Depending on the individually combinable unit configuration, the following values can be determined:

  • SF6 volume percentage (%)
  • Moisture concentration
  • SO2 concentration (ppm)
  • HF concentration (ppm)
  • H2S concentration (ppm)
  • CO concentration (ppm)
Thanks to the easy-to-remove integrated battery, transport regulations are no longer a problem. Our field-replaceable sensors offer a great benefit as the device is ready for use immediately after the exchange without any down time.

SF6 gas monitoring system

For continuous monitoring of the gas quality

The device is used to monitor and record the quality of the SF6 gas in a gas compartment. The following quality parameters can be determined with only one measurement:

The user can select between three measurement modes:

LEAKSPY SF6

For quick detection and quantification of small SF6 leaks

LEAKSPY SF6 (Sensor length 300 mm)

The cordless battery-operated LEAKSPY SF6 precisely measures SF6 concentration in air by means of a non dispersive infrared sensor (NDIR sensor) and indicates the value on a graphic display in ppmv. The device allows precise localisation of leaks by searching the highest SF6 concentration. Thanks to the high accuracy and the low detection limit it is possible to carry out integral measurements as well as measurements for determination of leakage rates.

To protect the device from particles the sensor is equipped with a filter which can be cleaned and/or exchanged easily by the operator. In case there is SF6 contamination already existing, the LeakSpy can be adjusted to this value. Thus it is possible to detect leakages even in already contaminated areas. The SF6 concentration is indicated in ppmv as well as by an audible signal.

MULTI-ANALYSER C4

For verification of several parameters with only one measurement

LEAKSPY C4

For quick detection and quantification of smallest leaks

LEAKSPY C4 for gas mixtures with C4-FN

The cordless battery-operated LeakSpyC4 precisely measures the C4-FN (p. eg. 3MTM NovecTM 4710) concentration in air by means of a non-dispersive infrared sensor (NDIR sensor) and indicates the value on a graphic display in ppmv. The device allows precise localisation of leaks by searching the highest 3MTMNovecTM 4710 concentration. Thanks to the high accuracy and the low detection limit it is possible to carry out integral measurements as well as measurements for determination of leak rates.

To protect the device from particles the sensor is equipped with a filter which can be cleaned and/or exchanged easily by the operator. In case there is 3MTMNovecTM 4710 contamination already existing, the LEAKSPY C4 can be adjusted to this value. Thus, it is possible to detect leaks even in already contaminated areas. The 3MTM NovecTM 4710 concentration is indicated in ppmv as well as by an audible signal.

Gas Handling Equipment

Mega Series

Service carts for large and extra large gas compartments

The L170 service cart has been developed to recover, evacuate, fill, purify and vent large to extra large SF6 gas compartments with high process reliability. Thus, a gas compartment with 1,000l and 5 bar pa can be recovered down to 1 mbar in only 38 minutes*) when using the DN40 coupling**). Thanks to the state-of-the art control all functions run automatically and are displayed on a 10“ touch panel. The operating software with intuitive user navigation in several languages makes operation very easy and comfortable. This service cart can be optionally operated via mobile devices such as a smartphone, tablet or laptop.

Emission-free gas handling is the high standard for all DILO service carts. SF6 gas can be recovered down to a fi nal vacuum of < 1 mbar. When using the hermetically gastight couplings and connecting systems, emissions will not occur! The series also enables short recovery and evacuating times thanks to the existing DN20 / DN 40 couplings.

Mini Series

For efficient SF6 gas handling on small gas compartments

The Mini Series is perfectly suited for gas handling of small gas compartments and gas reclaiming to < 5 mbar. This series even exceeds die IEC directives which are in effect and can compete with the more powerful series. We recommend using this series for small gas quantities. Oilfree compressors allow gas handling without contamination by oil residues.

The Mini Series includes two versions:

Compact Series

Starter Series for medium sized gas compartments

The service carts of the Compact series offer the best entry into professional gas handling.

Equipped with the well-proven DILO components these service carts allow the recovery, filling, purification of SF6 gas,  evacuation and venting of medium sized gas compartments. Depending on the device type, the Compact series allows gas recovery down to < 5 mbar or 1 mbar. Thus, this series considerably exceeds the IEC guideline 62271-4.

This series offers semi-automatic operation via a 7“ touch screen and is the compact solution for emission-free gas handling.

Evacuating and refilling device

For evacuation of air and refilling of gas compartments from SF6 gas bottles

 

In practice, the device covers two important functions. The integrated vacuum pump is the core component of the device. This vacuum pump evacuates the air down to < 1 mbar so that no air/gas mixture is produced during the subsequent filling process. The well proven DILO coupling principle ensures safe handling without emission.

Using the 3-001-4-R022 version the filling weight can be registered comfortably by means of a weighing scale. The weight is indicated on the illuminated display which switches off automatically if the scales are not used for a certain time. Thanks to the tare function high precision quantification of gas inputs and outputs is possible.

MINI SERIES C4

For professional handling of gas mixtures

Compressor unit for gas mixtures with C4-FN

Operating voltage: 220 – 240 V / 50 – 60 Hz alternating current

The MINI SERIES C4 is perfectly suited for efficient gas handling of small gas compartments and gas recovery down to < 5 mbar. It is specially provided for the handling of gas mixtures based on C4-FN. The handy individual MINI components for recovery, consisting of a compressor and a vacuum compressor, are connected to the unit viawire braided hoses.

Gas compartments can be filled directly with gaseous mixtures from pressure vessels via the integrated pressure reducer.

Unit for recovery of gas mixtures C4

For professional handling of gas mixtures

Service cart for gas mixtures with C4-FN

This model range has been specially developed for the emission-free recovery of gas mixtures based on C4-FN and its specific requirements and allows gas recovery down to a final vacuum of < 1 mbar. The devices are equipped with a compressor temperature control specially adapted to the gas mixtures. The maximum storage pressure is 100 bar (pe) and thus allows liquid storage of the gas mixture. The recovered gas quantity can be determined accurately by the integrated digital scales. A useful tool tray is also available for storing accessories and hoses.

Gas Treatment & Reconditioning

MIXING UNIT C4

Mixing unit for the production of gas mixtures with C4-FN

The mixing units have been specially developed for the handling of gas mixtures based on C4-FN and their specific requirements. A total of three gas components can be mixed. The gas mixture is circulated by the compressor to generate a homogenous mixture.

Using the integrated compressor, the generated gas mixture can be filled directly into gas compartments or for transportation, stored into cylinders with up to 93 bar.

If necessary, e.g. when changing the mixing ratio, the mixing vessel can be emptied completely (< 1 mbar). The integrated vacuum compressor also enables the complete recovery of pressure cylinders, so that any residual quantities of the insulating fluids C4-FN can be completely fed into the mixing process and no gas loss occurs. A device that combines the latest technology with economic efficiency.

DILO Certified Gas

Meeting any requirements

As a gas handling specialist with over 50 years of experience in the field of sulphur hexafluoride (SF6), we have expanded our service portfolio to include the new DILO Certified Gas service range.

We guarantee the high quality of our DILO Certified Gas with our seal of quality for all products and services offered in the field of SF6 gas, new alternative insulating gases and gas mixtures such as C4-FN. It includes selling of pure gases and mixtures, the reconditioning and return of used gas, analyses in the in-house DILO-Lab as well as services related to gas handling such as TÜV repeated inspections of pressure vessels, logistics, legal transport of the gases and many other services.

SMART-DRYER SF6

SF6 has been used in medium and high voltage switchgear for decades due to its high quenching and insulating properties. However, these excellent properties are reduced by moisture and can lead to failure or – at worst – destruction of the switchgear due to fl ashover. Previously, if high moisture levels were detected, the switchgear would have to be decommissioned and the gas would have to be changed, which is an expensive and time-consuming procedure.

The SmartDryer SF6 makes it easy to „dry“ the gas while the switchgear is in use, thus eliminating downtimes and signifi cantly cutting maintenance costs. The SmartDryer SF6 can be controlled remotely, so no permanent on-site control is required.

DILO Accessories & Couplings

Manifolds

Distributors with 4x DN20 coupling groove part – 3-718-R036

For simultaneous gas handling on several gas compartments

The DILO manifolds help to significantly increase the efficiency of gas handling with service carts in the GIS unit production or at utility companies.

The standard DILO manifolds are equipped with three DN20 connections as well as a DN20 or DN40 connection to the service cart. Thus, it is possible to recover, to evacuate or to fill three gas compartments at the same time.

THE DILO SEAL PRINCIPLE

DILO is a seal principle without intermediate seal in the form of groove and tongue with little depth of immersion. This principle guarantees permanent tightness at high static and dynamic alternating stresses which might result from vacuum and pressure in connection with high temperatures and vibrations
inside the tubing systems.

Sealing in accordance with the DILO principle is elected by direct contact with the sealing profiles of the groove and tongue parts. The different radii of curvature of the groove and tongue are in a certain
relation to each other.

Thus, two ring-shaped sealing areas are produced which create high stability.

The additional braking surface prevents plastic deformations at the ring-shaped sealing areas.

DILO fittings are easy to assemble and require no maintenance. They can loosened and re-connected as often as desired. Thus, the re-use of the DILO seal is guaranteed. Due to the little depth of immersion of DILO groove and tongue the tubes can be immediately pulled out laterally after loosing the clamping nut.

Wire braided hose

We also offer wire-braided stainless steel hoses as well as rubber hoses. They are pressure and vacuum-tight and are available with different coupling connections. No matter whether you need a hose for connection to SF6 maintenance devices, gas insulated fabrication plants or other devices, we can offer the appropriate hose connection. The suitable connecting parts must be ordered separately.

Range of application and temperature:
Reduction factors apply for the operating pressure with increasing temperature in accordance with DIN EN ISO 10380, e.g. at 100° C the 0.74 factor applies. Only conditionally suitable for use
in a marine or coastal atmosphere. Corrosion resistance tested according to IEC 60068-2-52.
UV-resistant. Increased service life and temperature resistance compared to rubber hose.

Materials and composition:
Full metal wall made of 1.4404 with outside wire sheathing made of stainless steel.
Supply length: max. 25 m

Fitting material: brass or stainless steel
For nominal diameter DN8 the clamping nut is made of stainless steel.

Let's Build Success Together

We believe in long-term partnerships that drive reliability, efficiency, and innovation. Whether it’s high-voltage testing, condition monitoring, or asset optimization, our experts are ready to support you with proven solutions. Contact us to discuss how we can help you achieve your goals.

Contact Us