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The ferromagnetic detection system (FMDS) that gives you the confidence it will do its job when it really matters.

Ferroguard Assure by Metrasens is the most capable entry control FMDS for MRI safety available – as deployed by 9 of the top 10 best hospitals in the US*.

See Metrasens guide to Reducing MRI Accidents here.

Click here for Metrasens Emergent Situations in MR Webinar.

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Ferroguard Assure is always wall-mounted outside the MRI door in Zone III, rather than inside the door frame like alternative FMDS. This means no detection gaps or sensor activation delays – even with outswing doors.

Choose Ferroguard Assure and be confident that your FMDS will be active and will alert you in those crucial seconds that make the difference between incident and catastrophe.


With its clear and intuitive eye-level traffic light display, Ferroguard Assure’s Visual Early Warning (ViEW®) technology gives you time to react to prevent an accident.

A secondary audible alert gives additional warning if the Visual Early Warning is ignored.


Alarm fatigue is consistently identified as the most serious technology-related safety issue.** Ferroguard Assure’s Smart Alarm™ has been shown to reduce extraneous audible alerts by 85%.***

Never an alarm on exiting the room, never an alarm through door movement. Smart Alarm™ works with any MRI shielded door without compromising detection of risk items.


Trustworthy detection

Always on, always detecting before, not beyond the door.

Clear, simple alerts

Intuitive, eye-level, traffic light display alerts you to risk items.

Secondary audible alert

In case the Visual Early Warning System is ignored.

Lowest probability of alarm fatigue

No alarms through door movement or when exiting the room.

Built to last

Constructed from ruggedized, industrial grade aluminium and will look good for years to come.

The quality you expect

The only FMDS designed under ISO9001 international quality standards.

All-inclusive installation support

Professional installation by fully certified Ferroguard engineers.


Weights & Dimensions

Physical Specification:

Part Weight Height Width Depth
Sensor Units (each) 9.8lb (4.5kg) 53.9” (137cm) 3.1” (8cm) 3.5” (9cm)
Hub Unit 13.0lb (5.9kg) 13” (33cm) 15” (38cm) 3” (7.6cm)
Door Sensor 0.5lb (225g) 3-11”  variable

(7.6 – 28cm)

7” (18cm) 1.75” (4.5cm)
Door Vane 23oz (649g) 6” (15cm) 16” (40cm) 3.5” (9cm)
Retro-Reflector 0.4oz (10g) 1.5” (3.8cm) 2” (5cm) ¼” (0.64cm)

Packaging Specifications:

Part Weight Height Width Depth
Packaging as shipped. 55lb (25kg) 8.7” (22cm) 60” (151cm) 14.2” (36cm)

Operating Characteristics:

Range Recommended maximum sensor unit separation is 6’ (1.8m).
Display Response. Response time for Beacon display <0.1s. Average Display Reset Time <0.3ms. Magnitude display is indication only for purposes of alerting staff.
Audible alarm response time. <1ms from optical beam break.


For safety reasons Ferroguard Assure has no user controls. All control settings are set during installation by the installer. Settings are agreed between the installer and the MRI Manager or Safety Officer.

Part Controls
Sensor Units Sensitivity for visual warning and audible alarm.

Volume of audible alarm.

Hub Unit Software based via USB to laptop. Multiple parameters.

System Reset switch 

Power supply:

Ferroguard Assure uses AC power with no special requirements which is directly wired to the Assure Hub (AHUB) Unit via an isolation switch (not supplied). Ferroguard Assure should be kept permanently switched on. Isolation from the hospital AC power is via the isolation switch. The isolation switch and wiring to the Hub Unit are not a part of the product and are the responsibility of the hospital to maintain.

Voltage Input 100-240 VAC, 47-63Hz
Current draw 1A Max


Ferroguard Assure is in accordance with the following Directives

  • 2014/30/EU Conforms with the essential protection requirements of the Electromagnetic Compatibility Directive and its amending directives
  • 2014/35/EU Conforms with the safety objectives of the Low Voltage Directive and its amending directives
  • 2011/65/EU Conforms with Directive 2011/65/EU of the European Parliament and of the Council of 8 June 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment.

Metrasens Ferroguard Assure has been designed and manufactured to the following standards;

  • EN 61326-1:2013 Electrical equipment for measurement, control and laboratory use – EMC requirements – Part 1: General requirements
  • EN 61010-1:2010 Safety requirements for electrical equipment for measurement, control and laboratory use – Part 1: General requirements

and is CE and ETL Marked.

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About Us

Imaging Solutions is a healthcare imaging equipment products and consumables supplier. Our critical point of difference is our "single source supplier" philosophy which allows us to offer unmatched convenience and value for money to all our customers. Imaging Solutions offers an extensive range of world-market-leading, first quality, high performance products which assist our customers in delivering outstanding radiographic diagnostic quality first time, every time.