Precision Twin Cell Sample Calorimeters, CHF400 Series
The ANTECH CHF400 Series Precision Twin Cell Sample Calorimeters feature a thermostatically controlled calorimeter body that houses two identical cylindrical or rectangular cells, one “sample” and one “reference”. Both cells have the same construction and the same heat transfer properties. The CHF400 Series are available in a variety of volume sizes:
| Model CHF400-0780 | 7.8 litre chamber |
| Model CHF400-1500 | 15 litre chamber |
| Model CHF400-2000 | 20 litre chamber |
| Model CHF400-2500 | 25 litre chamber |
| Model CHF400-5300 | 53 litre chamber |
| Model CHF400-6000 | 60 litre chamber |
| Model CHF400-7200 | 72 litre chamber |
When a sample is added, an array of thermopile temperature sensors measure the difference between the temperature of the sample cell and the temperature of the reference cell across a common reference point.
Differential measurements are made by measuring the temperature increase in the sample cell in comparison with that of the reference cell. The differences in temperature are directly related to the heat generation rate of the sample. Coupled with the large amount of thermal insulation, this method significantly reduces variations due to ambient drift and increases the sensitivity of the system. The high sensitivity of the systems provides the calorimeters with excellent low levels of detection.
A local computer or optional built-in PC displays the temperature data of the two cells in real time and records the data for further analysis.
Remote data analysis can be carried out via an Ethernet link. The software also predicts when the system will return to equilibrium and finish the measurement to enable time-efficient measurement planning and effectively reduce measurement time. The system is mounted in a self contained, fully mobile unit for easy transportation but can be securely locked in place for the duration of the measurement process.
References
J. A. Mason, K. J. Burke, N. J. Challacombe, A. R. Packman and A. C. N. Towner, Design and Operation of a Large Volume Twin Cell Heat-flow Calorimeter for the Measurement of both Tritium and Plutonium Samples, Proceedings of the 50th Annual Meeting of the Institute of Nuclear Materials Management, Tucson, Arizona, USA, July 2009. (09-LA-565-INMM)
J. A. Mason, K. J. Burke and A. C. N. Towner, Characteristics and Performance of a Large Volume Twin Cell Heat-flow Calorimeter for Plutonium and Tritium Measurement, Proceedings of INMM12, Orlando, Florida, July 2012. (12-A-359-INMM)
C. Knott, A. Provenzano, A. Roffey Comprehensive-Performance-Analysis-of-Large-Volume-Twin-Cell-Heat-Flow-Calorimeters-for-Tritium-Assay, Metal Chemistry Group, AWE, Aldermaston, Reading, Berkshire, RG7 4PR, UK, Ocotber 2014
Features
- Twin cell heat-flow measurement for improved sensitivity
- Thermostatically controlled outer calorimeter region – no water cooling
- Electric sample for calibration verification (Joule effect)
- Optional built-in touch screen PC
- Microwatt resolution
- Sample power measurement range of below 25 μW to >10 W
Benefits
- CHF400 Series calorimeters can be supplied with smaller or larger measurement chamber dimensions and volumes
- Windows based menu driven software for ease of use
- Software prediction algorithm estimates final sample power
- Measurement accuracy typically less than 0.5% above 10 mW
- Low underlying electrical noise, equivalent to 25 μW peak to peak
- Long response time to changes in the ambient environment provides extreme stability of sample and reference cells
- PC can be remotely controlled via Ethernet connection
- Fully transportable
| Model no. | CHF400-0780 | CHF400-1500 | CHF400-2000 | CHF400-2500 | CHF400-5300 | CHF400-6000 | CHF400-7200 |
| External dimensions (H x W x D) | 1470 mm x 1230 mm x 690 mm | 1730 mm x 1730 mm x 750 mm | 1730 mm x 1727 mm x 875 mm | 1760 mm x 1800 mm x 875 mm | |||
| Internal dimensions (H x W x D) | 500 mm (diam.) x 100 mm (H) | 250 mm x 250 mm x 250 mm | 290 mm x 290 mm x 300 mm | 275 mm x 275 mm x 400 mm | 330 mm x 330 mm x 500 mm | 350 mm x 350 mm x 500 mm | 380 mm x 380 mm x 500 mm |
| Weight (kg) | 300 | 550 | 650 | 750 | 950 | 1150 | |
| Measurement chamber volume (L) | 7.8 | 15 | 20 | 25 | 53 | 60 | 72 |
| Sample power measurement range | 25 μW – 1 W | 500 μW – >10 W | 1000 μW – >10 W | ||||
| Detection limit | 5 μW | 200 μW | < 500 μW | 700 μW | |||
| Heat-flow calibration constant | 120 μW / mW | 160 μW / mW | 190 μW / mW | 160 μW / mW | |||
| Analysis software | Windows operating system, MasterHFCal analysis software | ||||||
| Power supply | 110 or 230 VAC, 50 – 60 Hz | ||||||
| Network connection | Ethernet | ||||||