Field servicing of circuit breakers up to 132 kV calls for a unit with more storage and recovery capacity than a small handcart, but without the bulk and cost of a trailer-mounted unit. The AGRU-7 fills that gap: its 2 m³/h oil-less compressor, rated up to 34 bar, liquefies the SF6 into two 52 kg on-board cylinders (104 kg), recovers the gas down to 100 mbar (99.6%) or below 1 mbar (99.9%) in the XDS version, and returns it dried and filtered to 0.1 µm, all on a 324 kg cart with four swivel casters.
SF6 calculator
Estimate how long the AGRU-7 takes to recover the gas and evacuate your compartment, and how much gas is left inside →AGRU-7 key data
- Application: the AGRU-7 is a portable SF6 gas recovery unit for circuit breakers up to 132 kV, metal-clad switchgear and bus ducts.
- Recovery: the standard AGRU-7 recovers SF6 down to 100 mbar (99.6% of the gas); the AGRU-7 XDS adds a 6 m³/h vacuum compressor and a digital vacuum gauge and leaves a residual pressure below 1 mbar (99.9%).
- Compressor: the AGRU-7's SF6 compressor is fully oil-less, direct-drive, rated 2 m³/h and up to 34 bar, with a four-pass air-cooled condenser and a pressure switch that shuts the unit down at the maximum allowable pressure.
- Storage: the AGRU-7 carries two 52 kg cylinders, 104 kg of liquid SF6 that keeps indefinitely below 45.5 °C without refrigeration; the auxiliary connection accepts external tanks rated at 40 bar minimum.
- Evacuation: the AGRU-7's 17 m³/h (10 CFM) vacuum pump takes the equipment below 1 mbar before filling and has a blank-off pressure of 0.03 mbar.
- Purification: D-1 dryer filter with activated alumina, molecular-sieve purifier cartridge for arcing by-products and 0.1 µm F-1 particulate filter; in the AGRU-7 the recovered gas is purified twice during the normal cycle and filters are changed every 50 compressor hours.
- Construction: the AGRU-7 switches modes with a single valve, has stainless steel tubing and fittings and runs on 220 V, single-phase, 50/60 Hz; it measures 1727 × 851 × 1003 mm and weighs 324 kg with two cylinders.
Benefits
A single valve
One valve selects the operating mode: recovery, evacuation, purification or filling.
Fully oil-less compressor
2 m³/h direct-drive compressor rated up to 34 bar, which liquefies the SF6 for storage in the on-board cylinders.
99.6% or 99.9% recovery
The standard version recovers SF6 down to 100 mbar; the XDS version adds a 6 m³/h vacuum compressor and reaches a residual pressure below 1 mbar.
Clean, dry gas
Dryer filter, purifier cartridge and 0.1 µm particulate filter, with a colour-change moisture indicator. Filters are changed without special tools.
Applications
- Recover and purify SF6, removing particles, moisture and decomposition products.
- Evacuate air and moisture prior to filling.
- Consolidate partially used SF6 cylinders.
- Store SF6 in liquid state and fill equipment at regulated pressure.
About the product
The cart, on four swivel casters, carries two 52 kg cylinders: 104 kg of liquid SF6 on board, expandable without limit with external tanks through the auxiliary connection. The 17 m³/h vacuum pump evacuates equipment below 1 mbar. Stainless steel tubing and fittings, 220 V supply and a 3 m power cord. Hoses with DN20 connections, adapters for North American (CGA-590) and European (DIN 477) cylinders and the digital cylinder scale are supplied as accessories.
Technical specifications
| Application | Circuit breakers up to 132 kV, metal-clad switchgear and bus ducts |
| SF6 compressor | Oil-less, direct drive; 2 m³/h; up to 34 bar |
| SF6 recovery | Down to 100 mbar (99.6%); XDS version: < 1 mbar (99.9%) |
| Vacuum pump | 17 m³/h (10 CFM); < 1 mbar |
| Filtration | D-1 dryer filter, purifier cartridge and F-1 particulate filter (0.1 µm) |
| On-board storage | 2 × 52 kg cylinders (104 kg of liquid SF6); expandable |
| Power supply | 220 V, single-phase, 50/60 Hz (other voltages on request) |
| Dimensions (height × width × depth) | 1727 × 851 × 1003 mm |
| Weight | 324 kg, with two cylinders |
| Vacuum pump blank-off pressure | 0.03 mbar (20 microns); 0.37 kW motor |
| Filling pressure regulator | 0 - 7 bar, spring-loaded, for regulated filling |
| External storage | Tanks rated at 40 bar minimum; liquid SF6 without refrigeration below 45.5 °C |
Frequently asked questions
How long can SF6 be kept in the AGRU-7's cylinders?
Indefinitely: the AGRU-7 stores 104 kg of SF6 as liquid in its two 52 kg cylinders, and the gas keeps without refrigeration as long as ambient temperature stays below 45.5 °C. For more capacity, external tanks rated at 40 bar minimum are connected.
At what pressure does the AGRU-7 refill the circuit breaker?
The AGRU-7 refills the equipment through a 0 - 7 bar spring-loaded filling regulator, and two 4″ stainless steel gauges show equipment pressure and discharge pressure during operation.
What is the difference between the AGRU-7 and the AGRU-7 XDS?
The standard version recovers SF6 down to 100 mbar (99.6%). The XDS adds a 6 m³/h vacuum compressor and a digital vacuum gauge, and leaves a residual pressure below 1 mbar (99.9%).
How much SF6 can it store?
104 kg in liquid state in the two on-board cylinders. Through the auxiliary connection, storage can be expanded without limit with external cylinders or tanks.
Are hoses included?
No. They are ordered separately in sets of two 3 m or 6 m hoses with DN20 connections, together with the adapters required for each cylinder type.
How often are the filters changed?
Replacing the filter kit every 50 hours of compressor operation is recommended; the moisture indicator shows the condition of the gas.
