Eilon Engineering Ltd. RON 2501 NG Operating Manual 22
However, the system will function in much higher temperatures provided
that it is exposed for short periods of time, short enough not to reach the
interior temperature limit, followed by cooling to the lowest ambient
temperature locally available. The temperature will decrease slowly because
the insulating jacket delays the decrease of the load cell internal temperature.
If the load cell is placed in a well-ventilated location (e.g. opposite a fan), the
rate of cooling will be increased. What is required is a cycle with a short heat
exposure time and a cooling phase long enough for the interior temperature
to remain below the 80ºC (175ºF) limit. This procedure will solve the
problem of weighing hot foundry ladles. The heat shield package also
includes a radiation shield consisting of a metal plate that protects the load
cell electronic housing from the heat radiating from the molten metal.
Some ways of improving conditions during the heat exposure phase:
*The distance between the load cell and the heat source should be as great
as possible. There are cases where it is possible to install the load cell
above the crane hoist. In this instance, the distance from the heat source
is greater and consequently the load cell shielding is also improved.
*Whenever possible, the foundry ladle should be covered in order to
decrease the ambient temperature and direct heat radiation.
*In some cases, drops of molten metal spray from the ladle. Use suitable
means to protect the load cell and prevent molten drops of metal from
hitting the heat shield jacket and, in particular, to prevent them from
adhering to the jacket. This will avoid damage to the jacket which can
affect its insulation properties.
The heat shield jacket is produced by a leading firm using fibber (JT650G1)
having heat protection of 500ºC (940ºF) in continuous use and 600ºC
(1150ºF) for short periods.
8.11 CONTINUOUS MAX. DISPLAY – ONLY IF APPLICABLE
When in use, the indicator will display the max. value continuously.
When a new measured value is higher than the max. displayed, this value
becomes the new max. and will be displayed continuously until a higher
measured value is detected.
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