Plate/Probe Temperature: The icon to the left of the numbers will switch from a picture of a
probe in a vessel when the probe is in use to a flat surface with heat rays radiating up from the
surface when the probe is removed and the plate surface is being controlled. The row of
numbers to the right shows the temperature of either the plate or probe. These numbers are
normally followed with
A
º
C
@
which denotes that the temperature reading is in degrees
centigrade. However, the display can be made to read in degrees Fahrenheit by holding the
HEATER key depressed for 3 seconds. When a target temperature is set into the unit, the
temperature values in the display will toggle from the target temperature to the actual
temperature. When the actual temperature is displayed, the symbol to the left of the display will
illuminate.
Stirrer: There are units in this series without stirrers (HP60 & HP61), and units with one stirrer
(HS60 and HS61), and units with five stirrers (HS65). The units without stirrers will not have a
numerical value displayed in the middle row of the display. The units with a single stirrer will
display the value of the stirrer in RPM with “RPM” to the right of the numbers. The units with
5-stirrers will display the value of the stirrer in RPM with “RPM” below a box to the right
showing which stirrer of the 5 is being displayed. The STIRRER SELECT key next to the
display can be used to move a dot around in the box next to the numerical values displayed to
choose the stirrer position being monitored. All stirrer positions can be checked this way.
Ramp: When the RAMP key is depressed the
º
C symbol to the right of the top line of the display
with convert to “
º
C/hr”. (The number value set in the display is always in degrees centigrade per
hour). When the value is entered for a ramp, the word “RAMP” will appear vertically on the left
of the display and it will remain illuminated as long as a ramp value is being used. This tells the
user that the target temperature as set for the probe or plate is moving from its starting point to
the target temperature at a fixed rate in degrees centigrade per hour. The
º
C/Hr icon will convert
back to
º
C and will be displaying only the actual and target temperatures set for either the plate
or probe. To view the ramp rate set, depress RAMP.
Timer: The bottom line of the display is the timer. The timer is displayed and can be set to
99:59:59 maximum (99 hours, 59 minutes, 59 seconds). The timer will count down to zero from
its setting and sound an audible alarm.
Auto-Off: The count-down timer can be used with an auto-off function that will turn off the
heater and stirrer when the timer counts down to zero. This function is not for use in a program,
but for use in non-programmed operation. When the AUTO-OFF key is depressed the words
A
AUTO-OFF
@
will appear to the right of the timer value set. When this function is actuated, the
timer will count down to zero, sound the audible alarm, and turn the heater and stirrer off.
9
Program: The words PROG and a number value from 1 to 10 will be displayed to the left of the
timer value when setting a program into memory.
KEYBOARD
Power Button: This button is for turning the power to the unit on and off.
