Tcl / Thermocouple Lag; Tcr / Thermocouple Reversed; Thermocouple Offset; Selecting °F Or °C Display - Orton Sentry Xpress 4.0 Manual

tCL / Thermocouple Lag

The heating rate is slower than 9°F / 5°C per hour and the
actual kiln temperature is more than 100°F / 56°C away
from the programmed temperature. The tCL alarm be-
comes inactive above 500°F. To return to the
press any key. Causes:
Worn or burned out elements, defective relays, low volt-
age, and defective thermocouple.
On kilns that use a portable controller, the thermocou-
ple has fallen out of the firing chamber.
A bare spot on the thermocouple lead wires has touched
a grounded object inside the kiln switch box causing the
thermocouple to short out.
You have programmed a cooling segment temperature
that is below room temperature.

tCr / Thermocouple Reversed

Thermocouple lead wires are reversed. Check that the
thermocouple lead wires are connected to the correct ter-
minals. See your kiln's wiring diagram.
Thermocouple
Offset
You can calibrate the controller to fire up to 20°F / 11°C
hotter or cooler than the zero factory setting.
From , press the
temperature, hold, etc.,
With shown in the display, press the
key.
will appear. Press the arrow keys to change
the controller temperature.
Press the key to return to the
To fire the controller, press
pear. Or to return to
times.
display,
key. After rate,
will appear.
display.
. will ap-
, press two more
Selecting °F or
°C Display
The controller can display temperature in either °F or
°C. If your controller shows a small display dot in the lower
right corner of the display, the temperature shown is °C. No
dot means °F. To change temperature display:
UNPLUG kiln or disconnect power.
Remove the four screws that hold the controller to
the kiln. Carefully remove the controller from the
kiln. Leave wires attached to the controller.
The C/F jumper terminal is on the back of the controller, circled above.
Look at the back of the controller. You will find a set
of connector pins near the bottom labeled "C/F."
When a jumper is placed on the C/F pins, the display
reads °F. When the jumper is removed, display reads
°C. Remove or insert the jumper as desired. (You
can purchase the jumper from a computer supply
store if necessary.)
Install the controller being careful not to jar compo-
nents on the back of the controller against the kiln
case.
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