The unitis a precision instrument. Although it has been designed for optimum
durability and trouble freeoperation, it must be handled with care.
Mostprobes havehandle temperature limits. Be sure that the probe handle tem-
perature limit is not exceededin the air abovethe instrument.
The instrumentand any thermometer probes used with it are sensitive instru-
ments thatcan be easily damaged. Alwayshandle these devices with care. Do
not allowthem to be dropped, struck, stressed, or overheated.
When calibrating PRTsalways follow correct calibration procedure and cali-
brate from high temperatures to low temperatures with the appropriate triple
point of water checks. Neverimmerse a wet or cold PRT into a bath filled with
hot medium. Severedamage to the PRT may result as well as personal injury to
the calibration technician.
This furnace isnot designed to be portable. Therefore, moving the furnace once
it has been installed should be keptto a minimum. To safely move the furnace,
twop eople arerequired. One person should lift the furnace at each end of the
furnace, place their hand under thecontrol drawer, and lift simultaneously be-
ing careful notto tip. Ensure that the furnace is de-energized and cooled to less
then 100°C. Removethe equilibration block prior to moving. The equilibration
block can damage the fused silica tube that is extremely fragile.
The controlprobe must be inserted properly in the instrument and plugged into
the socketat the back of the furnace. DO NOT operate the furnace without the
controlprobe properly inserted and attached. The furnace will not operate cor-
rectlywithout the control probe. Injury to operating personnel and permanent
damage to the furnace could occur.
Componentsand heater lifetimes can be shortened by continuous high tempera-
tureoperation.
If a mains supply powerfluctuation occurs, immediately turn off the furnace.
Powerbumps from brown-outs and black-outs can damage the instrument. Wait
until the powerhas stabilized before re-energizing the furnace.
The probe and the block may expandat different rates. Allow for probe expan-
sion insidethe well as the block heats. Otherwise, the probe may become stuck
in the well.
Be awarethat the equilibratio n block expands as the furnace heats. It will ex-
tend beyondthe front of the furnace at high temperatures anywhere from ¼ to
approximately½ inch. This is normal and is due to thermal expansion.
Takecare that all sensors used as references or being calibrated in the furnace
are capable of withstanding the desired temperature range to be used.
1.3 Authorized Service Centers
Pleasecontact one of the following Authorized Service Centers to coordinate
serviceon your Hart product:
5
1 Before You Start
Authorized Service Centers