64
::
HEAT
Immersion heater
This is used with the insulated cups item no. 2745.00 for
2745.00
confirmation of Joules law. The plastic lid has a center
hole for a thermometer. Mounted with 2.2 ohm heating
element connected to two standard 4 mm jack recep -
tacles. Diameter: 65 mm. Height: 75 mm. Mass: 30 g.
2745.10 Immersion heater
Insulated cups
These thermal cups (25/package) are useful for experi-
ments with specific heat. They will fit item no. 2745.10.
Height: 85 mm. Upper diameter: 75 mm. Volume capa -
2745.10
city: 180 ml.
2745.00 Insulated cups
Immersion heater for low voltage
Immersion heaters for low voltage. Suitable for test tu -
bes with 30 mm outside diameter. Length of the heater
240 mm.
2750.20 Immersion heater 2,5 Ohms
2750.30 Immersion heater 5 Ohms
2750.30
Heat radiation detector
This sensor is sensitive to electromagnetic radiation in
the wavelength region from 0.25 µm to 20 µm, i.e. from
the ultraviolet through the visible to the far infrared. Thus
it is sensitive to thermal radiation in the near IR (0.3 - 3
µm) and far IR (3 µm - 20 µm) regions. Because the sen-
sor uses a black absorbing surface and a thermopile
detector, the response of the sensor is uniform over its
wavelength range. The output signal is proportional to
the incident power per unit area striking the detector sur-
face. The sensor is adjusted so that an output of 4 V cor-
responds to 1000 W/m
2
+/-3%. The cable is terminated
in a 5 pole male DIN connector compatible with compu-
ter interface. 2872.81
The sensor can also be used along with the battery box
accessory, item no. 2515.60 (see page 85), to provide
the necessary 5 V DC bias voltage. When using the bat-
tery box an ordinary digital voltmeter can be used to read
the output signal.
Supplied with a holder with a 10 mm diameter rod for
mounting on a laboratory stand.
2515.60
2872.81 Heat radiation detector
Leidenfrost dish
The apparatus is a dish made of steel. The dish is heated
up to several hundred degrees Centigrade, and a few
drops of water are put in the dish. Some of the water
remains liquid even though the boiling point of water is
2635.00
exceeded. The liquid forms a small sphere which moves
about on a pillow of steam. The experiment demonstra-
tes the poor conductivity of steam and also the high sur-
face tension of water. The dish diameter is 56 mm, and it
is 6 mm high. Mass: 85 grams.
2635.00 Leidenfrost dish
®
Science Equipment for Education Physics
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