Blackstone E518

Dental practices head the manufacturer's list of settings. Mirrors, probes, tweezers, forceps, hand scalers, and other solid hand instruments fit the Class N scope, and the two drying stages make the wrapped-storage route in HTM 01-05 workable for sets not used the same day. Handpieces and other lumened instruments need a vacuum cycle, so a practice that reprocesses them in-house keeps a second steriliser for that work.

The manufacturer also lists surgical and emergency rooms, ophthalmology, gynaecology, cosmetic clinics, laboratories and veterinary practices. In each, the test is the same: the load must be solid, unwrapped and steam-tolerant. That suits stainless specula, scissors, needle holders, podiatry nippers and solid piercing forceps, and it excludes hollow tattoo tubes and anything processed in a pouch. Laboratory use is confined to solid loads, because the manual's load table covers solid material only. Equipment used on animals falls outside UK MDR 2002, and in veterinary practices the RCVS Practice Standards Scheme governs the setting.

Steam sterilisation has a strong record, but the record depends on the people running it. A retrospective study of 198,771 biological indicator tests from 362 dental offices in Saskatchewan, covering 2015 to 2022, found an overall failure rate of 0.20% and attributed 91.8% of failures to human error. A national survey of Scottish dental practices, published in 2007, found that 88% of benchtop sterilisers were Type N, yet only 51% had been tested on installation and 26% commissioned. Loading within the 2.4 kg limit, filling to the heater,r and validating at installation determined results like these.

NHS procurement routes require conformity and validation evidence for decontamination equipment, and equivalent public procurement elsewhere asks the same. The conformity documentation those procurement routes require is issued by the manufacturer and shared by the enquiry team.

Compressor Drying Without an Extra Step

Dry+ starts automatically once pressure is released, so no one has to return to the machine to begin drying. The manufacturer describes the compressor stage as shortening drying time and improving results, with the heater running throughout. How far it gets with a given set still depends on tray loading, so check a load before it is wrapped.

A Wrapped-Storage Route for Type N Loads

Dry instruments can go straight from the chamber into wrapping, and a wrapped Type N set can be kept for up to a year under the English guidance. Unwrapped sets in the clinical area must be reprocessed at the end of the day, whether they were used or not. Drying in the same machine therefore reduces the number of unused instruments sent round again, freeing cycles for the instruments that were actually used.

Usable Load Stated in Kilograms

The manufacturer gives the working limit as 2.4 kg per cycle and 1.2 kg per tray for both programmes, not just a chamber volume. A practice can plan sessions against that figure directly, weigh a typical set, and know how many cycles a clinical list will need. Spreading materials across separate trays, or keeping 3 cm between them, keeps steam reaching every surface.

Interlocks at Both Ends of the Cycle

A cycle will not start until the door handle is turned fully home, and the pressure lock keeps the door closed until the chamber returns to zero. Staff therefore cannot open the door onto pressurised steam, and the system catches a door that was never properly closed before heating begins. If the door is opened or its switch fails mid-cycle, the unit stops and reports E6.

No Water Connection to Install

Water is poured into the chamber by hand, and waste drains into a container, so the E518 needs no plumbing and no backflow protection. Because it is not connected to the mains supply, the water-fittings regulations that govern plumbed equipment do not apply, and the steriliser can go into a room with no drain at all. The trade-off is daily routine work: filling before each cycle and emptying the discharge container.

Cycle Stages Readable Across the Room

The status window steps through HE while heating, a countdown during the hold, PL during pressure release, dr during drying and Ed at the end. Anyone in the decontamination room can see which stage a load has reached without opening anything. Together with the pressure and temperature windows, those readings supply everything a handwritten cycle record needs.

Two Supply Versions for Sites Worldwide

The E518 comes in a 220–240 V 50 Hz version and a 110–120 V 60 Hz version. A group with clinics in countries on different mains standards can therefore keep one model, one maintenance routine and one set of staff instructions. The version has to match the destination when the order is placed.

Upkeep the Practice Can Handle

Routine care runs on a short calendar: clean the door seal monthly and replace it yearly, and wash the chamber, trays, and rack weekly. The door adjustment wrench comes in the box, so you can tighten a seal that begins to leak on site without waiting for a visit. Spare seals can be arranged through the enquiry team.

A Scope That Fits a Written Policy

Class N means solid instruments that go in unwrapped, and the E518 handles nothing else. That single load type is simple to include in a decontamination policy and easy for an inspector to check against the logbook. New staff learn one rule about what the machine accepts, which reduces the chance of a pouched or hollow item going through the wrong cycle.

Two Steam Programmes

The 121 °C programme runs at 1.1 bar (110 kPa) and the 134 °C programme at 2.1 bar (210 kPa). One button selects each, and an indicator lights to confirm the choice before you press Start.

Adjustable Hold Times

At 121 °C, the hold defaults to 30 minutes and can be set anywhere from 30 to 60. The 134 °C hold defaults to 10 minutes; the ceiling is 20 minutes on the Blackstone sheet and in the manual's specification table, but 60 in the manual's setting instructions, so plan validation around 10 to 20. To change the time, hold the programme button while switching on, adjust with the 121 °C and 134 °C buttons, then press Start to store the new time.

Heat Drying

A heater in the chamber dries the load for 1 to 60 minutes, 60 by default. Choosing Dry also selects automatic drainage, and holding the button for two seconds runs a drying phase automatically after a cycle finishes.

Dry+ Compressor Stage

Here, the built-in air compressor works together with heat drying, never on its own, on a timer from 1 to 60 minutes. Both the Dry and Dry+ indicators flash while it runs, and a two-second press starts the stage manually.

Automatic Discharge

When sterilising ends, water and steam leave through the discharge port while the status window shows PL. Automatic drainage is pre-selected and can be switched off with the Drain button. Holding that button for five seconds opens or closes the drain valve, which is only done with the door open.

18-Litre Cylindrical Chamber

The chamber is 350 mm deep and 247 to 250 mm across, so plan around the smaller figure; 250 mm comes from the Blackstone sheet and series manual, 247 mm from the series web listing. The heater sits inside it, so the water level and the load share the same space.

Aluminium Trays and Rack

Two aluminium trays, each 285 by 192 mm, come with a rack that holds up to four. Lift the trays in and out with the supplied handle, as they are hot at the end of a cycle, and the enquiry team can arrange extra trays for the two spare rack positions.

Three LED Windows

Separate windows show chamber pressure, chamber temperature and cycle status. The status window also reads "do" when the door is open and "Ld" once it is closed and a cycle can begin.

Door and Pressure Locks

A cycle starts only after the door handle reaches its maximum position. When sterilising is over, the pressure safety lock keeps the door shut until chamber pressure returns to zero.

Overload Protection and Safety Valve

Temperature and pressure overload protection cuts in if either runs beyond its limit. A safety valve on the body provides mechanical relief for the pressure vessel.

Fault Codes

E1 reports an overheated heater, E2 an overheated chamber and E4 a heat-up that took too long, usually a leak, a worn door seal or a heater fault. E6 means the door was opened during the cycle or the door switch has disconnected.

Chamber Water Fill

There is no reservoir and no separate steam generator. Before each cycle, distilled or deionised water goes into the chamber until it covers the heater; check the level again after the cycle ends.

Rear Discharge Port

The drain tube connects to the discharge port and its free end is fixed in a container. A metal container suits the hot discharge; a plastic one needs some cold water in it first to prevent deformation.

Electrical Versions

Sources put the draw of both the 220–240 V 50 Hz and 110–120 V 60 Hz versions at 1500 or 1750 VA, and 1750 VA is the figure to wire for. A dedicated circuit is recommended, with an earthed, correctly polarised outlet.

Door Seal Service

The wrench supplied in the box turns an adjusting nut beneath the door's plastic cover to tighten the sealing plate. When you replace the seal each year, moisten the new one with medical disinfectant or isopropyl alcohol and press it into place in sequence.

Operating Limits

The E518 is rated for rooms between 5 and 40 °C, up to 80% relative humidity without condensation, and atmospheric pressure from 76 to 106 kPa. Running noise stays below 70 dBA.

The E518 suits practices with solid instruments that go into the chamber unwrapped and want them dried in the same machine so they can be wrapped and stored. It is the wrong purchase if handpieces, lumened items, or pouched loads must be processed in-house, or if cycle records must be printed or downloaded. Before ordering, settle three things: a dedicated circuit planned for 1750 VA, a competent person for the written scheme and the validation visit, and a reliable supply of distilled or deionised water. Medigear.uk lists the E518 for business buyers worldwide and can arrange delivery, installation, commissioning, familiarisation and service cover. Ask the enquiry team for the declaration of conformity, the EN 13060 test evidence and the warranty terms before ordering.