ELECTRICAL HAZARD
These guidelines must be followed to ensure that the safety mechanisms in this
instrument will operate properly. This instrument must be plugged into a 230
VAC (± 10%) 50/60 Hz only electric outlet. The power cord of the instrument
is equipped with a three-pronged grounding plug for your protection against
electrical shock hazards. It must be plugged directly into a properly grounded
three-prong receptacle. The receptacle must be installed in accordance with lo-
cal codes and ordinances. or adapter plug. Additionally, the instrument has a
Permanent Earth Ground that must be connected during use. DO NOT use an
extension cord Consult a qualified electrician.
Always replace the power cord with an approved cord of the correct rating and
type. If you have questions, contact a Hart Scientific Authorized Service Center
(see Section 1.3).
The instrument is not equipped with easily accessible fuses. The fuses are lo-
cated inside the control drawer. We do not recommend replacing the fuses with-
out calling a Hart Scientific Authorized Service Center first.
High voltage is used in the operation of this equipment. Severe injury or death
may result if personnel fail to observe the safety precautions. Before working
inside the equipment, turn off the power and disconnect the power cord.
Always ensure that the equilibration block ground is connection prior to use of
the instrument.
1.2.2
Cautions
Always operate this instrument at room temperature between 41°F and 104°F
(5°C to 40°C). Allow sufficient air circulation by leaving at least 18 inches (45
cm) of clearance around the instrument. DO NOT place instrument in a corner
or block the back of the instrument. Extreme temperatures are emitted from the
back and front of the furnace. Allow sufficient space in front of the furnace to
work and to insert and remove the probes.
Read Section 4, Installation, before placing the instrument into service.
DO NOT use fluids to clean out the well. Fluids could leak into and damage the
instrument.
Never introduce any foreign material into the probe hole of the insert. Fluids,
etc. can leak into the instrument causing damage.
DO NOT change the values of the calibration constants from the factory set
values. The correct setting of these parameters is important to the safety and
proper operation of the unit.
Read and understand the controller operation prior to operating the instrument.
The controller manufacturer’s manual is included with the instrument.
DO NOT operate this instrument in an excessively wet, oily, dusty, or dirty
environment.
9112A Calibration Furnace
User’s Guide
4
