Updated 25 Jun 2014

Universal Security Instruments

MDS300L

Bottom line: This dual-sensor smoke alarm is very good at detecting fast (flaming) fires and comes with a long-life battery. But it’s extremely poor at detecting slow (smouldering) fires. There are more effective smoke alarms than this.

MDS300L
Consumer score
37
Price guide

$52.98

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Test results

Overall score
Poor
37
Flaming fire
Very good
8.2/10
Smouldering fire
Extremely poor
0/10

Good points

  • Very good flaming fire response.
  • Has hush button.
  • Supplied with a long-life battery.

But

  • Extremely poor smouldering fire response.

How we test

Overall score:

  • Flaming fire (50 percent)
  • Smouldering fire (50 percent)

Price is what we paid in December 2013.

About our test
Our test was conducted in the fire laboratory of the Building Research Association (BRANZ). We purchased 3 examples of each model. Our results are the average of the performances of the 3 examples.

The alarms were fixed to a ceiling panel in a mocked-up hallway adjacent to the door opening of a fireproof room (which was about the size of a single-car garage).

  • The flaming fire test: 3 pieces of 40mm-square 300mm-long sticks were set alight using a small quantity of methylated spirits. The resulting smoke built up in the room and flowed into the mock hallway.
  • The smouldering fire test: A 60W electric soldering iron was pre-heated and laid horizontally on to a 1.2 kg piece of 70mm-thick polyurethane upholstery foam. An electric fan was used to evenly distribute the resulting smoke out into the mock hallway.

In both tests, the smoke density was measured at the location of the alarms using a laser light-source and detector.

Full specs

Model

Price guide
$52.98
Alarm type
Dual

Specifications

Hush button

Features

10-year battery life

Member reviews