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W:\ELECTRICAL\MANUAL\BENCH\GENERAL INSTRUCTIONS\BENCHOVEN INS.8-18
6 SAFETY EQUIPMENT
6.1 Practically all explosions and fires in ovens can be traced back to human error. It
should be noted that:
6-1.1 For the protection of personnel and property, careful consideration should be given
to the supervision and monitoring of conditions that could cause, or could lead to, a
real or potential hazard on any installation.
6-1.2 The presence of safety equipment on an installation cannot, in itself, ensure
absolute safety of operation.
6-1.3 There is no substitute for a diligent, capable, well-trained operator.
6-1.4 Highly repetitive operational cycling of any safety device can reduce its life span.
6-2 Thermostats, switches and electric relays should not be used as substitutes for
electrical disconnects or unplugging equipment.
6-3 Regularly scheduled inspection, testing, and maintenance of all safety devices shall
be performed. (See Section 7 - Maintenance and Appendix B - Minimum Periodic
Maintenance Report)
6-4 Safety devices shall not be removed or rendered ineffective by bypassing them
electrically or mechanically.
6-5 All units are equipped with a manual reset excess temperature limit interlock.
Operating at temperatures above the setting of the excess temperature limit interlock
will result in opening the circuit to the heating elements. These devices must be
reset before power will be restored to the heating elements. If the excess
temperature limit interlock repeatedly trips, the cause of over-heating should be
determined and corrected before processing is continued.
6-5.1 Non-adjustable excess temperature limit interlock (standard on Models NB, DR)
will trip at approximately 50E to 100EF above the maximum operating temperature
of the oven. These devices are reset by depressing the red button located on the
rear of control panel. The non-adjustable excess temperature limit interlock is
installed to protect the oven from a runaway condition. It is the users responsibility
to monitor any product in the oven if over-heating can cause damage to the
product or cause a fire.
6-5.2 Adjustable excess temperature limit interlock (standard on Models NT and NTR)
are mounted on the front of the control panel and have a dial on which to set the
trip temperature. It is recommended that this temperature be set slightly (15E to
25EF) above the operating temperature to protect the oven workload as well as the
oven from a runaway condition.
6-5.3 Do not operate oven without a functional excess temperature interlock. Do not by-
pass or otherwise defeat the excess temperature interlock.
6.6 No matter how much safety equipment is provided on the oven, it cannot protect the
operator, other personnel or property from unsafe conditions caused by poor
judgement or misapplication. Common sense must be used for safe operation. If in
doubt, contact the factory. Check the process periodically to ensure oven is being
used as originally intended.
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