K90100/K90190 Auto Melting Point Unit
Operation and Technical Manual
Page 18
Koehler Instrument Company, Inc.
1595 Sycamore Avenue • Bohemia, New York 11716-1796 • USA
Toll Free: 1-800-878-
9070 (US only) • Tel: +1 631 589 3800 • Fax: +1 631 589 3815
http://www.koehlerinstrument.com • e-mail: [email protected]
Petroleum Testing & Analysis Instrumentation • Custom Design & Manufacturing
Heat mode
: In this mode, the furnace will heat until either the end temperature of melt is
detected or until the furnace cutoff temperature is attained. After the furnace temperature
reaches 5°C below the SET temperature, temperature starts rising with user specified rate.
AUTO / MANUAL detection operation can be used with this mode.
Heat & Cool mode
: Only MANUAL operation is to be used with this mode. Procedure to
be followed for this mode. When the furnace temperature reaches 5°C below the SET
temperature value, then temperature starts rising with user specified rate. The start
temperature of melt is recorded by pressing ‘LOCK’ key. As soon as start of melt is
recorded, the heating stops and cooling starts with the same rate as that of heating.
However, because of heat flux, the sample continues to melt, to fully melted state and then
starts solidifying. The moment it begins to solidify, press ‘LOCK’ key to record the COOL
temperature. The melting point is interpolated as (HEAT temperature + COOL
temperature) / 2.0 where HEAT temperature is the interpolated temperature at fully
molten state.
Display reads Melting Range Process/detection.
The Melting Range determination can be done in two ways, i.e. Automatic detection of
Start and End as well as Manually by LOCK key.
In Heat Mode the detection can be done in AUTO as well as in MANUAL operation.
For e.g. to select ‘AUTO’ operation. Press ‘1’ & ‘ENTER’
If ‘Heat & Cool’ Mode is selected, the Only ‘MANUAL’ detection is possible since the
user has to Lock the Start & End temperature by pressing the LOCK key.
AUTO operation
: At 5 °C below the SET temperature, the lamp will automatically adjust
to optimum intensity depending on the brightness of the sample. The system will then
continue to heat with SET RATE. The start temperature will be automatically logged. The
end point is also detected automatically to give the melting range for the particular sample.
MANUAL operation
: The start temp. is recorded by using the ‘LOCK’ key. The end
temperature should also be recorded by using ‘LOCK’ key a second time, to give the
melting range for the particular sample.
Operation:_
1>Auto 2>Manual
