Blackstone WF-150DM

The catalogue lists the WF-150DM under dental equipment, and its series is described as sterile services equipment, placing it in dental hospital decontamination units, small hospital sterile services departments, and day surgery units. Those settings reprocess wrapped instrument trays, surgical textiles and hollow instruments such as dental handpieces and cannulated devices, all loads that need air removed under vacuum before steam can reach them.

Its single door suits a decontamination room where the workflow runs from dirty to clean within one space. Departments designed around a physical barrier between wash and pack areas need a pass-through design, which this single-door configuration is not. That decision belongs in the department's layout before ordering.

Testing is where vacuum sterilisers succeed or fail. In a 2020 laboratory case study, two commercial Bowie-Dick test packs passed with air deliberately left in the chamber when the cycle's come-up was slowed, and detected it only when the test cycle met the standard's requirements. Published troubleshooting of a prevacuum steriliser names air leaks into the chamber, poor air removal and non-condensable gases in the steam supply as the main causes of Bowie-Dick failure. Validation therefore has to fix the test cycle itself, and it tests steam quality and chamber leak-tightness alongside the daily check.

Public health services buy sterilisers of this size through formal procurement, including the NHS, and expect EN 285 evidence and a validation plan, as public purchasers elsewhere do. The conformity documentation those procurement routes require is issued by the manufacturer and shared by the enquiry team.

Steam Penetration for Wrapped, Porous and Hollow Loads

Repeated vacuum pulses down to −0.086 MPa draw air out of packs, textiles and lumens before the sterilising phase. Wrapped, porous and hollow loads are therefore within its scope, which is what lets a department wrap sets before sterilising and store them afterwards.

A Chamber Rated in Sterilisation Modules

At 700 × 450 × 480 mm, the chamber holds one standard 300 × 300 × 600 mm sterilisation module. Expressing capacity that way lets a planner compare throughput in the same units sterile services departments already use, which the 150-litre volume alone does not give.

Uniformity Stated to ±2 °C

The sheet gives temperature uniformity across the chamber as within ±2.0 °C. That is the figure thermometric validation measures against, so it sets a clear expectation before the engineer arrives.

Utility Demands Published in Full

Steam per cycle, water per cycle, supply pressures, compressed air and electrical load all appear on the sheet. Estates teams can size every service from the start, avoiding a missing connection on installation day.

Steam From the Site or a Generator

The sheet lists an external steam connection, and a series listing describes the built-in generator as optional. Sites with clean steam available can connect to it, while others can specify a generator, provided the electrical supply is sized to match.

Cycle Records for Traceability

Series listings describe report processing and traceability for each cycle. Sterile services audits examine records that follow a load from steriliser to patient, so the record format is worth settling early.

A Layout for One-Room Workflows

A single door keeps the installation simple where decontamination happens in one room with a managed dirty-to-clean flow. Dental decontamination units and small departments often work that way, avoiding the wall penetration a pass-through unit requires.

Two Gauges in View

Two pressure gauges sit on the front panel above the controls. They give operators analogue readings in view during every cycle, alongside the controller's own figures.

Model Code That Reads Clearly

D marks the single door and M the pulsating vacuum, following the series coding. Purchase orders and service records can therefore be checked against the configuration at a glance.

150-Litre Rectangular Chamber

The chamber measures 700 mm long, 450 mm wide, and 480 mm high, and accommodates one 300 × 300 × 600 mm sterilisation module. Its rectangular section matches the shape of standard instrument trays and containers.

Pulsating Vacuum to −0.086 MPa

Air is removed in repeated vacuum and steam pulses before the sterilising phase, the method designated M in the model code. Each pulse removes a share of the remaining air, allowing steam to reach the inside of packs and lumens.

Working Pressure and Temperature

Sterilisation runs at a working pressure of 0.23 MPa, with working temperatures from 115 to 138 °C. The range spans the usual 121 °C and 134 °C sterilising temperatures.

Design Ratings

The vessel is designed for −0.1 to 0.3 MPa and 150 °C, covering both the vacuum and pressure phases of the cycle.

Temperature Uniformity

Temperature across the chamber is stated as uniform within ±2.0 °C. Validation measures it with sensors distributed through the chamber.

External Steam Connection

Steam enters at 0.3 to 0.6 MPa from a site supply, with consumption of up to 14 kg per cycle. Steam quality at the connection is tested for non-condensable gases, dryness and superheat.

Optional Steam Generator

A series listing describes a built-in steam generator as an option for sites without a suitable steam supply. A generator adds to the electrical load, so settle the specification and supply together.

Water Supply

Water is required at 0.1 to 0.2 MPa, with consumption of up to 190 kg per cycle. That volume leaves through the drain, so drainage capacity should be planned to match.

Compressed Air

Compressed air is required at 0.4 to 0.7 MPa. Series descriptions use it for a pneumatic door seal, so a reliable site supply or compressor is required for installation.

Three-Phase Electrical Supply

The unit runs on a three-phase, five-wire AC 380 V, 50 Hz supply and draws up to 23 kW, about 35 A per phase. In the UK, the installation follows BS 7671 and is carried out by a qualified electrician.

Front Gauges and Control Panel

The Blackstone photograph shows two pressure gauges above a control panel with a display on the cabine front.

Door With Full-Height Handle

The front door closes with a full-height vertical handle, as shown in the photograph. The manufacturer's description of its horizontal sterilisers adds an electric door lock with a safety interlock.

Sterilisation Basket

Series listings equip models from the WF-150 up with a sterilisation basket.

Programme and Record Functions

Series listings describe programme selection, parameter setting, report processing and traceability. The manufacturer also cites F0 and temperature-time control for its horizontal sterilisers.

Dimensions and Weight

The cabinet measures 950 × 1,120 × 1,760 mm and weighs 720 kg net, 820 kg gross. The 950 mm depth is the narrowest dimension the delivery route must clear.

The WF-150DM suits dental decontamination units, small sterile services departments and day surgery units processing wrapped, porous and hollow loads one sterilisation module at a time. It needs three-phase power, water, compressed air, steam and a floor rated for its weight, so it is the wrong choice where those services are missing, where a pass-through barrier is required, or where a benchtop unit would suffice. Before ordering, commission the structural check and route survey, size a supply of about 35 A per phase, and plan water, backflow protection and drainage. Then appoint whoever will validate it to EN ISO 17665 and examine it under its written scheme. Medigear.uk lists the WF-150DM for business buyers worldwide and can arrange delivery, installation, commissioning, familiarisation and service cover. Ask the enquiry team for the installation drawing, steam arrangement, programme list and EN 285 test evidence before ordering.