Description
Design
The ToniCAL model 7338 consists of a one piece control device in a support and a separated round calorimeter vessel with a housing made of stainless steel.
Integrated in the control device are:
An electronic thermostat to guarantee a constant temperature of the measuring vessel and in the measuring cells
An electric calibration unit with access to the measuring cell with infinitely variable adjustable voltage from 0V to 5V DC. Thus the five calibration steps could be choosen free
Six high stable, three step, switchable measuring amplifier for the thermo signal voltage which has to be measured
Indication for the thermo signal with an RS232 com puter interface, one indication for the temperature in the measuring vessel
In the calorimeter vessel are placed:
Thermal isolated measuring cell with two measuring chambers for the placement of the measuring and the inert sample and the corresponding sensors for detection of the thermal voltage
The sensors between measuring and inert sample which are connected in difference
One central and one radial heat sources placed opposite to the axis of the measuring cells
Independent acting feeding device for the constant and quick mixing of the reaction partners within the sample vessel
Working Principle
A defined quantity of the pulverized sample portion is filled in a thin walled measuring vessel (usual test glass) and placed in the measuring cell in the calorimeter vessel. A further vessel (reusable injection syringe) with the fluid portion is integrated into the sample vessel. Simultaneously or timely independent the measuring cell can be filled with the same or different materials. A totally tempered inert sample with the same filling height is allocated to the measuring chamber.
After the thermal balance is reached in the measuring cell the both reaction partners (normally binding building materials and distilled water) will be mixed under pres sure within few seconds.
Using an optional later injection module, designed for two fluid vessels, a further reaction partner (additive as BV, FM or others) can be dosed later and mixed with the ductile sample by the aid of a manually operated agitator rod. Directly with the mixing of the reaction partners starts the continuous recording of the thermo voltage [mV] as measure for the produced quantity of heat.
All measured values, graphics and test parameters will be stored in a database and can be exported.
The complete data detection and evaluation for the test is realized by the software ToniDCA which can be installed on a common PC system (limited IBM) from Pentium II with the operation systems Windows 95/98/2000/NT/XP.
