Control Calibration - Quincy lab Bench Series Operating Manual

Chamber Loading and Oven Performance
Load the oven so that air circulation within the oven is not impaired. Note the air flow from the top
section view (FIG. 5). Heated air flows from back to front along the side walls, moves horizontally
toward the chamber center and then back toward the recirculating blower. Placing an article
against the side walls or rear blower return vent opening will greatly affect unit performance i.e.
chamber uniformity, run-up & recovery, maximum operating temperature, and energy use
efficiency.
Here are some guidelines that are critical to optimum oven performance and better/faster work-
load processing.
Leave a space between articles on a shelf.
For best processing performance for a single
item, adjust one shelf so that the article is
centered in the oven.
Avoid placing articles on the oven floor.
Instead use a shelf at the lowest adjustable
position.
Do not place articles against the inner side
walls or the slotted vents in rear air plenum.
This will obstruct air flow and degrade
uniformity.
Do not overload the unit with large or high-
density loads. This will show by non-uniform
processing and/or long heat-through or
processing times.

Control Calibration

Calibration of the temperature knob dial is only recommended if your process requires certification
or if setting is off by more than 20
"analog" type control refers to the pointer being centered on the knob temperature marking when
measured against an external temperature measurement device reading of the same temperature.
Do not use the calibration adjustment to operate oven at temperatures beyond its rated range.
1. Turn the knob dial to the desired temperature and
allow the oven to settle at that temperature.
2. Pull the press-fit knob from the thermostat shaft,
be careful not to change the position of the shaft.
3. Using pliers, hold the outside of the shaft,
maintaining it in its original position. Using a small
flat screwdriver, turn the trim screw, located recessed
within the shaft center, clockwise to lower the
temperature or counter-clockwise to raise the
temperature. Turn the trim screw no more than 1/8
of a turn in the direction needed. Allow 15 minutes
for the temperature to settle at the new setting
before taking a new reading. Make subsequent
adjustments as needed.
o
F, due to contact wear from prolonged use. Calibration for this
TOP VIEW AIR FLOW
(SECTION)
FIG. 5