FTT Mass Loss Calorimeter
(EN ISO 13927; EN ISO 17554)
Mass Loss Calorimeter – Simple Heat Release Test Using a Conical Radiant Heater
The test method is used to assess the mass loss rate of a product under test conditions. The International Standards ISO 13927 and ISO 17554 specify this method for assessing the mass loss rate of essentially flat specimens exposed in the horizontal orientation to controlled levels of radiant heating with an external igniter under well-ventilated conditions.
The mass loss rate is determined by measurement of the specimen mass and is derived numerically. The time to ignition (sustained flaming) is also measured in this test. Mass loss rate can be used as an indirect measure of heat release rate for many products. However, some products, e.g. those with high water content, will have mass loss rates that are not so closely linked to heat release rates.
Such products need to be tested in accordance with ISO 56601 for correct assessment of heat release.
FTT Mass Loss Calorimeter
The FTT Mass Loss Calorimeter consists of a complete fire model from the Cone Calorimeter. It is an economical solution for those working to a limited budget and with a major interest in ignitability and mass loss work.
- The apparatus consists of:
- Conical Radiant Heater
- Water Cooling Collar
- Heater Shutter Assembly
- Spark Igniter
- Specimen Holder
- Load Cell
- Cold Plate (optional)
- Control Unit
- Flux Meter
- MLCCalc Software
- Methane Calibration Burner (optional)
- Chimney with Thermopile (optional)
Use of this instrument under a suitable hood enables the user to carry out thermal exposure studies, under the same precise exposure conditions as those used in the Cone Calorimeter, whilst visibly observing the specimen reaction and measuring the mass change. A flue containing a thermopile can also be added to the unit. Once calibrated using a methane burner the thermopile output can be used
to quantify heat release.
Features and Benefits
- Fire Model meets the specification of the ISO 5660 Cone Calorimeter.
- Fire Model manufactured from stainless steel for long life.
- 3 Control Thermocouples for the cone heater to maintain accurate heat flux.
- The special FTT split shutter mechanism is designed to reduce the radiated heat from affecting the sample support system and more importantly allowing time after the sample is positioned on the load cell before the test is started. The shutter is permanently in place on the apparatus and is operated using a simple lever which opens the shutter symmetrically from the centre.
- The FTT spark assembly is manually inserted into position using a lever mechanism. This is used in conjunction with the shutter mechanism. The sequence of operation is such that the electrodes can be positioned above the sample with the shutter closed. At the start of a test the operator opens the shutter lever which, in turn, automatically starts the spark sequence. Microswitches are fitted to the spark arm and the shutter mechanism for safe operation.
- Sample weight measurement is by a strain gauge load cell with quick electronic tare facility. The weight of the sample holder is zeroed electronically on touching a button.
- The load cell is housed in an enclosed case to reduce the effect of temperature change.
- Control unit is supplied in its own case with switches for power, ignition, load cell and cone heater