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Blackstone WF-250DM

✓ Certified Professional Seller

Blackstone Sterilisation & Disinfection

Blackstone WF-250DM

Product Code: STDI-SE-3817

The chamber is 600 mm square inside, so bulky sets and containers fit.

For bulky sets and rigid containers, this 250-litre single-door steriliser clears its chamber with pulsed vacuum before sterilising at 115 to 138 °C, maintaining temperature within ±2 °C across the space.

Sections

Autoclave

Categories

Sterilisation & Disinfection

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

Blackstone builds the WF-250DM as a 250-litre, single-door pulsating-vacuum steam steriliser for departments with loads that include bulky sets and containers. Rated for −0.1 to 0.3 MPa and 150 °C, it sterilises at 0.23 MPa between 115 and 138 °C once vacuum pulses down to −0.086 MPa have cleared the air. A cycle consumes up to 18 kg of steam supplied at 0.3 to 0.6 MPa and up to 200 kg of water at 0.1 to 0.2 MPa, and requires compressed air at 0.4 to 0.7 MPa. D in the model code denotes the single door, M the pulsating vacuum.

That 600 mm square chamber is the defining feature, and the building carries its consequences. Up to 35 kW from a three-phase 380 V, 50 Hz supply means about 53 A per phase. Each cycle's 200 kg of water must reach the unit under pressure and leave through a drain sized for hot discharge. At 1,900 mm high and 840 kg net, the cabinet also determines the size of every opening along its route and the load on its floor.

The chamber measures 780 mm long, 600 mm wide and 600 mm high, and series listings include a sterilisation basket. Two gauges sit above the front display panel, beside a door with a vertical handle. Series listings credit it with selectable programmes, traceable cycle reports and a validation port. The enquiry team shares the programme list, cycle times, record format and the usable module count of the loading system.

The cabinet stands 1,900 mm tall on a 1,030 × 1,300 mm footprint. Medigear. UK offers it to buyers in more than 80 countries, and the enquiry team provides stock and lead time.

Sterile services departments that serve operating theatres, dental hospital decontamination units and busy day surgery suites are where a 250-litre single-door chamber earns its place. Theatre trays, rigid containers, bulky orthopaedic and general sets, surgical textiles and hollow instruments all fit its pulsed-vacuum scope, and the 600 mm square cross-section takes wide loads whole. Its single door suits a decontamination room run with a managed dirty-to-clean flow.

Running a machine of this size is as much an estates question as a clinical one. A year of five-minute metering on an Australian hospital steriliser found electricity and water per kilogram sterilised fell from 3 kWh and 200 litres for 5 kg loads to 0.5 kWh and 20 litres for 40 kg loads. Standby also accounted for considerable use. Switching four idle sterilisers off at the same hospital was estimated to cut electricity use by 26% and water by 13%. In a separate test of a liquid ring vacuum pump, supply water at 50 °C raised water use to 94.2 litres per cycle, against 33.3 litres at 10 °C, and lengthened cycles.

Those findings shape how a department plans for the WF-250DM: full loads, a switch-off routine and a cool water feed matter as much as the steriliser itself.

Public buyers purchasing equipment on this scale, including the NHS, expect EN 285 evidence and a validation route, and procurement bodies elsewhere ask for much the same. The conformity documentation those procurement routes require is issued by the manufacturer and shared by the

A 600 mm Square Chamber for Bulky Loads

The chamber's 600 × 600 mm cross-section takes large containers and wide trays without tilting or splitting them, and its 780 mm length leaves room behind each one. Departments whose sets keep growing in size can load them whole.

Every Utility Stated Per Cycle

The sheet states steam, water, compressed air and electrical demand for each cycle. Estate teams can design the services from those figures before construction begins, which keeps the installation programme predictable.

An Electrical Load Engineer Can Size

At up to 35 kW, about 53 A per phase on a 380 V three-phase supply, the demand is known before a cable is pulled. That lets you size the distribution board, protective devices, and cable runs the first time correctly.

Water Use Bounded at 200 kg.

Water per cycle is capped at 200 kg, which sets the size of both the feed and the drain. Knowing the ceiling also lets an estates team judge the effect of a cooler water supply on a water-sealed vacuum system.

Steam From the Site or a Generator

Site steam at 0.3 to 0.6 MPa supplies up to 18 kg per cycle, and series listings offer a built-in generator for departments without suitable steam. The choice can follow the building's existing plant.

Wrapped, Porous and Hollow Loads

Before sterilising starts, vacuum pulses to −0.086 MPa pull the air from wrapped packs, drapes and instrument lumens. Wrapped trays, drapes and cannulated instruments therefore belong to its everyday workload.

Uniformity Within ±2 °C

Blackstone's sheet specifies uniformity of ±2.0 °C, the temperature spread across the chamber. Validation engineers measure against that figure, so expectations are set before testing begins.

Records Tied to Each Cycle

Series listings describe report processing and traceability for every cycle, linking each load to its programme and parameters. Sterile services audits follow those links.

One Door, One Room

A single door keeps the steriliser within one decontamination room, with no wall opening or sealing work to plan. For departments already laid out around a single-room flow, installation stays straightforward.

250-Litre Chamber, 600 mm Square

The chamber is 780 mm long, 600 mm wide and 600 mm high, a cross-section suited to rigid containers and wide trays.

Pulsed Air Removal

Repeated vacuum pulses reach −0.086 MPa before the sterilising phase, the process M denotes in the model code. Each pulse removes more of the air held inside packs and lumens.

Sterilising Conditions

The working pressure is 0.23 MPa, with temperatures from 115 to 138 °C, covering the usual 121 °C and 134 °C settings.

Vessel Rating

Design limits of −0.1 to 0.3 MPa and 150 °C account for the deepest vacuum and the highest pressure in each cycle.

Temperature Uniformity

Temperature across the chamber holds within ±2.0 °C, measured during validation with sensors spread through the load space.

Steam Connection

Site steam arrives at 0.3 to 0.6 MPa, and a cycle uses up to 18 kg, which sizes the steam branch and its condensate return.

Water Connection

Water arrives at 0.1 to 0.2 MPa, and up to 200 kg per cycle leaves through the drain; the drain should be rated for the full volume at discharge temperature.

Compressed Air

Compressed air at 0.4 to 0.7 MPa is required, and the manufacturer's description pairs it with a pneumatic door seal.

Three-Phase Supply

The steriliser runs on a three-phase, five-wire AC 380 V, 50 Hz supply, drawing up to 35 kW, about 53 A per phase. A demand of that size calls for a dedicated circuit from the distribution board.

Front Gauges and Display

The Blackstone photograph shows a pair of pressure gauges above the display panel, alongside the door and its vertical handle.

Sterilisation Basket

Series listings include a basket for models from the WF-150 up to the WF-360, and extra baskets can be arranged through the enquiry team.

Programme and Traceability Functions

Series listings describe programme selection, parameter setting, report processing and traceability, with F0 and temperature-time control named in the manufacturer's description of its horizontal range.

Optional Steam Generator

A series listing offers a built-in generator for sites without suitable steam, which brings its own electrical load.

Model Code DM

D identifies the single door and M the pulsating vacuum, so the code itself confirms the configuration on order documents.

Cabinet Size and Weight

The cabinet is 1,030 × 1,300 × 1,900 mm and weighs 840 kg net and 990 kg crated, per the Blackstone sheet.

The WF-250DM suits sterile services, dental hospitals, and day surgery departments with loads that fill a 600 mm square chamber, in buildings that can supply 35 kW, 200 kg of water per cycle, steam, and compressed air. It is the wrong choice for low daily volumes, layouts needing a pass-through barrier, and routes or floors that cannot accommodate a 1,900 mm, 990 kg crate. Before ordering, have the electrical capacity, water feed and drain, floor, and delivery route assessed, and appoint the people who will validate it and examine it under its written scheme. Medigear.uk lists the WF-250DM for business buyers worldwide and can arrange delivery, installation, commissioning, familiarisation and service cover. Ask the enquiry team for the installation drawing, module count, programme list, and EN 285 evidence before ordering.

FAQ

Frequently Asked Questions

Everything buyers need to know about sourcing medical equipment through MediGear.

Bulky instrument sets, rigid sterilisation containers, theatre trays, surgical textiles and hollow instruments all suit its pulsed-vacuum cycles. Departments that need a pass-through barrier need a double-door design, which this model is not. Where daily volume is low, the chamber will often run part-empty, and light loads use markedly more electricity and water per kilogram sterilised.

Up to 35 kW on a three-phase, five-wire 380 V 50 Hz supply, which is about 53 A per phase. In the UK, the supply and its isolation follow BS 7671, so an electrician should confirm spare capacity at the distribution board early. A series listing describes the steam generator as optional, and planning for the sheet's full 35 kW covers either arrangement.

Water must reach it at 0.1 to 0.2 MPa, and each cycle can use up to 200 kg, all of which leaves through a drain that must cope with hot discharge. The feed needs backflow protection under the Waterer Fitting Regulations. Where a steriliser's vacuum system is water-sealed, cooler supply water shortens cycles and reduces consumption, so ask the enquiry team which vacuum pump this unit uses.

The Blackstone sheet specifies an external steam connection at 0.3 to 0.6 MPa, using up to 18 kg per cycle, and a series listing offers a built-in generator as an option. The enquiry team shares the installation drawing showing the steam arrangement and vacuum pump of the quoted unit. Site steam must meet the EN 285 limits for non-condensable gases, superheat and dryness, checked at validation.

On paper, the 600 × 600 mm cross-section matches a stack two modules wide and two high of the standard 300 × 300 × 600 mm size, with no clearance left over. The usable count therefore depends on the basket or loading system, and the enquiry team states it alongside the programme list and cycle times.

The crated unit weighs 990 kg, and the cabinet alone measures 1,030 × 1,300 × 1,900 mm, so every door, corridor and lift on the route needs checking against those figures. Averaged over its footprint, 840 kg comes to about 630 kg per square metre before water, which calls for a structural assessment of the floor. LOLER requires a competent person to plan the lift into position.

Class B is an EN 13060 designation, and EN 13060 only covers small sterilisers under 60 litres that cannot hold a sterilisation module. A 250-litre chamber falls under EN 285, the large-steriliser standard, so the evidence to request is the manufacturer's EN 285 test data, with validation planned to EN ISO 17665.

The chamber and its steam and compressed air supplies are pressure systems under the Pressure Systems Safety Regulations 2000 in Great Britain, each needing a written scheme of examination and competent-person examinations. Validation and periodic testing come under Part C of HTM 01-01 for England and of SHTM 01-01 for Scotland, including Bowie-Dick, air leakage and steam quality tests. Medigear.uk can arrange installation, commissioning and service cover.

Running full loads, switching the steriliser off when idle, and supplying cool water to any water-sealed vacuum system all reduce electricity and water use. A year of metering on one hospital steriliser found standby accounted for considerable consumption, so idle hours deserve a plan as much as working ones.

Series listings describe report processing and traceability for each cycle. The enquiry team supplies the record format with the programme list, so the department can see how records will join its tracking system before ordering.

The WF-250DM is typically Class IIa under UK MDR 2002, or higher depending on use, as stated on the manufacturer's declaration of conformity, which the enquiry team shares. The declaration names the legal manufacturer and, given the chamber size, should cite EN 285 together with EN 61010-1 and EN 61010-2-040.