Multiple-Zone Thermocouple Offset; Selecting °F Or °C (Chg-); F/°C Temperature Conversion Formula; Thermocouple Type (Tc) - Orton Sentry 2.0 Operating Instructions Manual

ample: If you took a reading from a reliable source at
2000°F, you should check your controller reading at
around 2000°F.
Mount the thermocouple of the calibrated pyrometer in
the firing chamber near the Sentry's thermocouple. With
the Sentry on hold, compare readings between the Sentry
and the calibrated pyrometer. Adjust Thermocouple Offset
to compensate for any temperature difference between
them.
Setting Thermocouple Offset
You can enter a temperature change up to 45°F/25°C
higher or lower than the zero factory setting.
From , press
appears.
Press .
number, will appear.
Using the and keys, enter the new offset. (See
chart below.) Press
return to , press
Thermocouple Offset Settings
°F Setting °C Setting
C 0 C 0
H 1-45 H 1-25
C 1-45 C 1-25
Thermocouple Offset Examples
Setting
H 1
H 17
C 12

Multiple-Zone Thermocouple Offset

From , press
appears.
Press .
pear.
While displays, press
thermocouple(s), then
each press of the
Three-zone kilns:
Two-zone kilns:
When the correct thermocouple appears, press
.
Using the and keys, enter the new offset. (See
charts above.) Press
you adjusted (i.e.
other thermocouple, or return to
ing .
Selecting °F or °C (CHG-)
The controller operates in your choice of °F or °C tem-
perature. In °C display, a lighted dot appears in the lower
14
repeatedly until
, or a thermocouple offset
. will appear. To
.
Result
No adjustment
Kiln will fire hotter
Kiln will fire cooler
Result
Kiln will fire 1° hotter
Kiln will fire 17° hotter
Kiln will fire 12° cooler
repeatedly until
(top thermocouple) will ap-
. The other
, will appear with
key.
. The thermocouple
) will appear. Select an-
by press-
right. In °F, it disappears. To switch from °F to °C or vice
versa:
From , press
appears.
Press . Use the and keys to select
or .
After selecting one of the above, press
Press to return to
°F/°C Temperature Conversion Formula
Below are formulas for converting temperature between
°F and °C. Converting a firing rate requires a different for-
mula than firing temperature:
Firing Temperature
(i.e. "Fire to 1600°F." 1600°F = 871°C)
(°C x 1.8) +32 = °F
(°F - 32) ÷ 1.8 = °C
Firing Rate and Temperature Change
(i.e. "Fire at 200°F per hour" or "Fire 200°F hotter." 200°F =
111°C)
°C x 1.8 = °F
°F ÷ 1.8 = °C
Thermocouple
Type (TC)
Select Type-K, -S or -R
Thermocouple
The Sentry can be used
with Type-K, -S or -R
thermocouples. If you spe-
cialize in firings above
2200°F/1204°C, you should
use the Type-S or -R.
Type-K is best suited for
temperatures below
2200°F/1204°C.
The controller cannot detect the type of thermocouple
installed in your kiln. So if you change the thermocouple to
a different type, be sure to select the new thermocouple
type in TC Option.
Note: See your kiln supplier if you are not sure about
the type of thermocouple in your kiln.
CAUTION:
your kiln is wired with a Type-K, your kiln will
underfire. If you select Type-K and your kiln is wired
with a Type-S or R, your kiln will OVERFIRE. After us-
ing the Reset (RST) option (page 16), use the TC Op-
tion to select the correct thermocouple. Reset changes
the thermocouple selection to Type-S.
From , press
appears.
repeatedly until
.
If you make a
mistake during
programming,
press the
Stop/Back key.
You will go back
one step each
time you press
the key.
If you select Type-S or R, but
repeatedly until
.