Testing Multiple-Zone; Elements; Diff / Zone Temperature Difference; T123 / Zone Temperature Display - Orton Sentry 2.0 Operating Instructions Manual

middle section, and the bottom light power to the bot-
tom section. (Two-zone kilns: Ignore the center light.)
Note: Though power output lights are on, mechanical
problems can prevent the relays from turning on.
When a zone temperature is too low, its indicator light
will flash. The firing will continue as single-zone.

Testing Multiple-Zone

Elements

When relays or thermocouples are connected to the
wrong controller terminals, zones will show a wide temper-
ature difference. To wire the kiln properly, trace the switch
box wiring with the kiln's wiring diagram. Also, see "Ele-
ment Test," page 18.
Multiple-Zone Options
These options appear only on multiple-zone kilns. They
are accessed by pressing the Options key.
DIFF / Zone Temperature
Difference
View Maximum Temperature Spread
For a two-zone kiln, this option shows temperature dif-
ference between the zones. For a three-zone kiln, it shows
the highest temperature difference between any two zones.
If the temperature shown is larger than expected, go to op-
tion T123 to view the temperature of each zone.
Press repeatedly until
Press .
The maximum difference in temperature between
any zones will display. (Example:
T123 / Zone Temperature
Display
View Temperature of Each Zone
Press repeatedly until
Press .
The temperature for each
zone will display one af-
ter the other, cycling for
one minute. Then nor-
mal temperature display
will return. For example:
Top zone:
Middle zone:
Bottom zone:
14
Ramp-Hold
Chapter 6
The Options
Key
The Options key gives you access to a list of special fea-
tures. With each press of the Options key, you will see the
display code for the next option.
When you find the option you want to use, press
Use the
option.
changed will appear. You are then ready to go to
the next option.
Note: If you select a change for an option but don't
press
There are two ways to get out of Options and back to
Press
Do nothing for 60 seconds in Options. You will au-
tomatically be taken out of the Options display and
back to
Note: If you are firing the kiln while in Options, press-
ing
ing display. But it does not stop the firing.
appears.

TCOS / Thermocouple Offset

Calibrate the Thermocouple(s)
= 3°)
The thermocouple is the rod protruding into the firing
chamber. It measures temperature. Thermocouples can
"drift" as they age, causing a shift in temperature readings.
Thermocouple Offset calibrates the controller to compen-
sate for drift.
appears.
Note: The thermocouple must protrude into the firing
chamber the correct distance: 1" for ½" - ¼"-wide
thermocouples,
Calibrating Thermocouple Offset
With a Digital Pyrometer
You can calibrate Thermocouple Offset using a cali-
brated digital pyrometer. One way to calibrate your pyrom-
eter is to take it to a heat treater or other location that has a
calibrated controller you can trust. Take a reading from a
furnace with your pyrometer. Either zero it out to match
the calibrated controller on the furnace, or write down the
temperature difference between your pyrometer and the
reliable source. Store your pyrometer. Use it only for cali-
.
and keys to select changes within the
After making a selection for an option, press
. The display code for the option you just
, the change will not go into effect.
:
.
.
takes you out of Options and back to the fir-
" for " -
1 5
2 8
"-wide thermocouples.
1
8