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22 Chapter 3: Theory of Operation

Calorimetry Sciences Corp.

CSC 5300 N-ITC III 23

User’s Manual

Chapter Four: Hardware Description

Description of Parts and Functions

The CSC Model 5300 N-ITC III consists of the measuring unit (calorimeter block and

two non-removable reaction vessels), the burette assembly, which includes the stirring

system, and a cleaning accessory. With the exception of the power on/off switch located

on the back of the calorimeter unit, all functions of the N-ITC III are controlled remotely

by the computer through the USB connection. For more information see Chapter Five:

Software Description.

Measuring Unit

The measuring unit includes the calorimeter block and two non-removable reaction ves-

sels (sample and reference cells). Access tubes extend downward from inside the burette

mounting cavity on the top of the calorimeter and serve as conduits for the lling syringe,

titrant delivery, and reference needle.

They also provide for titrant equilibra-

tion and as a thermal barrier to the en-

vironment outside the calorimeter.

The CSC Model 5300 N-ITC III uses

a differential power compensation

design for maximum sensitivity and

responsiveness. Semiconducting ther-

moelectric devices (TED) are used for

temperature control as well as to detect

temperature differences between the

sample and reference cells. A computer

controlled PID loop uses a control

heater on the sample cell to maintain

a zero temperature difference between

the sample and reference cells (see

∆T

Sample

Cell

Reference

Cell

Thermal

Shield

TED Controlled

Block

Control

Heater

Figure 4-1: The N-ITC III measuring unit.

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