1
Description
The ITC2 is designed to control an isothermal zone, such as a Valco heated valve enclosure
(HVE), to a high degree of accuracy and stability through the use of a type K thermocou-
ple. The thermocouple was chosen because of its low mass, simplicity, and quick response
to temperature changes. It also employs a solid state zero crossing high current relay to
keep electromagnetic noise and heat generation to an absolute minimum.
Temperature sensing is provided through a 15-bit analog-to-digital converter. The
controller utilizes a PID* algorithm for configuring the best scheme according to the
mass, power applied, and heat loss.
*For more on PID, refer to
“Appendix A: Operation Terms and Principles”
on page 5.
For proper functioning, the input voltage will determine the output
power. That is, if you are supplying 120 VAC at the input, you must
use a 120 VAC heater rated at 600 watts maximum; 240VAC at the
input requires a 240 VAC heater rated at 1100 watts maximum
Figure 1
: ITC2 front panel
DISPLAY
Figure 2
: ITC2 rear panel
TYPE K
THERMOCOUPLE
INPUT
2 POLE
FUSE HOLDER
POWER ON/OFF
SWITCH
MAIN POWER
INPUT
(
POWER OUTPUT
(
FOR HEATER
(1100W @ 240 VAC,
(
600W @ 110 VAC)
PROGRAMMING
KEYS
