The unit is a precision instrument. Although it has been designed for optimum
durability and trouble free operation, it must be handled with care.
Most probes have handle temperature limits. Be sure that the probe handle tem-
perature limit is not exceeded in the air above the instrument.
The instrument and any thermometer probes used with it are sensitive instru-
ments that can be easily damaged. Always handle these devices with care. Do
not allow them to be dropped, struck, stressed, or overheated.
When calibrating PRTs always follow correct calibration procedure and cali-
brate from high temperatures to low temperatures with the appropriate triple
point of water checks. Never immerse a wet or cold PRT into a bath filled with
hot medium. Severe damage to the PRT may result as well as personal injury to
the calibration technician.
This furnace is not designed to be portable. Therefore, moving the furnace once
it has been installed should be kept to a minimum. To safely move the furnace,
two people are required. One person should lift the furnace at each end of the
furnace, place their hand under the control drawer, and lift simultaneously be-
ing careful not to tip. Ensure that the furnace is de-energized and cooled to less
then 100°C. Remove the equilibration block prior to moving. The equilibration
block can damage the fused silica tube that is extremely fragile.
The control probe must be inserted properly in the instrument and plugged into
the socket at the back of the furnace. DO NOT operate the furnace without the
control probe properly inserted and attached. The furnace will not operate cor-
rectly without the control probe. Injury to operating personnel and permanent
damage to the furnace could occur.
Components and heater lifetimes can be shortened by continuous high tempera-
ture operation.
If a mains supply power fluctuation occurs, immediately turn off the furnace.
Power bumps from brown-outs and black-outs can damage the instrument. Wait
until the power has stabilized before re-energizing the furnace.
The probe and the block may expand at different rates. Allow for probe expan-
sion inside the well as the block heats. Otherwise, the probe may become stuck
in the well.
Be aware that the equilibration block expands as the furnace heats. It will ex-
tend beyond the front of the furnace at high temperatures anywhere from ¼ to
approximately ½ inch. This is normal and is due to thermal expansion.
Take care 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
Please contact one of the following Authorized Service Centers to coordinate
service on your Hart product:
5
1 Before You Start
Authorized Service Centers
