Eilon Engineering Ltd. RON 2501 NG Operating Manual 21
current weight vanishes from the display at this critical moment when the
pouring has to be stopped – there is a good chance that the correct weight in
the ladle will overshoot, causing considerable damage.
To operate: press ENTER + TARE simultaneously. The display will show
NO.TEM meaning: NO TEMPERATURE = temperature will not be
displayed, nor the other announcements mentioned previously.
To cancel, press the same two keys ENTER + TARE. The display will show
TEM.ON meaning: TEMPERATURE ON = the temperature and the
announcements will be displayed.
Switching the system OFF in “NO.TEM” mode will terminate this mode, i.e.
when switching the system ON the mode in use will be TEM.ON (temp.
displayed).
Hot industry crane scale applications require special features in order for the
scales to function reliably in these hostile environments.
The severest task for the crane scale is weighing a ladle containing molten
metal. In the case of steel, the temperature of the molten metal exceeds
1000ºC (1800ºF) and there is a great deal of direct heat radiation. There is
little chance of an extension cable surviving in this environment. The
extension cable is usually required when using a remote readout. This means
that the crane scale should be 1) either with a large display integrated with
the load cell, or 2) a remote wireless (RF) indicator type. The former is not
popular because there are critical times when reading the scale is essential
and rising smoke frequently obscures the display in a way that makes it
impossible to read the weight. In these circumstances the RON 2501
provides the ideal solution for weighing hot ladles in a foundry.
The RON 2501 includes a load cell that transmits the load cell interior
temperature to the indicator. The limit is 80ºC (175ºF). The ambient
temperature in the ladle weighing location is many hundreds of degrees
Celsius. In order to delay the rise in interior load cell temperature and
prevent it reaching the limit of 80ºC (175ºF), a special fiber heat shield is
supplied. This shield covers the load cell's electronic housing and delays the
temperature increase inside the load cell where the electronic boards
including the R.F. transmitter are located. This shield only delays the
temperature rise, it cannot prevent it. If the RON 2501 system with the heat
shield is used in an ambient temperature of 90ºC (195ºF) for a long enough
period of time, the internal temperature will rise to 90ºC (195ºF) which is
above the system's working temperature limit.
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