Description
Design
The concrete calorimeter consists of a control device, situated in two steel housings, and a separate calorime-ter with a stainless steel casing.
The calorimeter block includes:
- The measuring cell with measuring cylinders for placement of measuring and inert specimens and the mesuring chaines radial to both cylinders
- A heating element placed as ring round the measuring cylinder
The measuring chain consist of a number of thermo-electric conductors connected in series. The chains between measuring and inert specimen are connected in difference. The measuring cells are placed one over
The other and are isolated thermically.
The calorimeter block itself can be swivelling hung up within a transportable rack.
For that reason the exchange of calibration cylinder and specimen cylinder between measurement and calibra-tion can be handeled without any problem.
To run various calorimeters with only one PC the control devices have to be connected in series.
The control device includes:
- An electronical temperature control for the heating of the calorimeter block
- A highly stabilized amplifier for the measureable volta-ge of the thermo-signal
- An indication for the thermo-signal with RS 232 interface
- A temperature indication for the internal temperature of the measuring cell
- A calibration unit for determination and checking of the device´s specific calibration constant
- A digital display of the concrete´s temperature in the centre of the specimen via RS 232 interface
Working principle
A defined quantity of fresh concrete is condensed in a two-walled specimen vessel and feeded into the measu-ring cylinder of the measuring cell.
The starting components have been pretempered up to the required measuring temperature (suitable is a nearly same temperature between concrete specimen with specimen cylinder and calorimeter vessel).
The set free quantity of heat is detected by the measu-ring chains as variation of temperature and continuously registered , evaluated and stored online at the PC.
After finishing of measurement, but also during the measurement procedure the measured values can be shown numerically or graphically at the monitor and simultaneously printed.
Besides that the computer supported registration and evaluation of the concrete´s temperature in the centre of the specimen and the measurement of the quantity of heat can be simultaneously managed.
