Ideal for the measurement of calorific content in solid and liquid fuels, LECO’s AC600 semi-automatic isoperibol calorimeter sets the standard for future calorimetry instruments. Its semi-automated operation, combined with the use of thermodynamic TruSpeed®, obtains a rapid analysis of calorific content and increased instrument throughput without sacrificing accuracy or instrument precision. A new, ergonomically-designed, lightweight combustion vessel assures ease of operation while greatly reducing operator strain.
The LECO AC600 semi-automatic calorimeter was developed to measure the calorific content of various organic materials such as coal, coke, and fuel oil.
The calorific value of a sample is determined by precisely measuring the heat released after combustion of the sample in a controlled environment. The heat released is proportional to the calorific value of the substance.
The sample is placed into a combustion vessel, which is pressurized with oxygen. The combustion vessel is automatically lowered into a water bath within the instrument known as a bucket. The bucket is sealed using an inflatable bladder. The cavity surrounding the bucket is known as the jacket and is also filled with water. The water temperature in the jacket is closely controlled at a precise set temperature (isoperibol calorimeter system). The sample is ignited and the temperature of the bucket and jacket water is measured by an electrical thermometer with a resolution of 0.0001 of a degree. A measurement of the water temperature inside the bucket and jacket is collected every second. The results can be corrected within the software for any spiking, nitrogen, sulfur, moisture, and ash content if necessary. Two options for analyzing data are available. A simple temperature difference may be chosen by the user (Delta T mode), in which calorific values are determined by a simple maximum temperature rise of the bucket. The user may also choose to use a thermodynamic model (TruSpeed mode) that has been developed by LECO to model heat exchange within the AC600 system. The TruSpeed mode takes into account heat capacities of the system's components along with corrections for energy transfer within the system. The TruSpeed mode enables the AC600 to attain rapid 5 minute analysis times without compromising the accuracy or precision of the calorific result.
AC600 with standard vessel
AC600 with halogen-resistant vessel
Dual AC600 with standard vessels
The TGM800 provides a high precision, automated solution for moisture determination by replacing the slow, laborous, traditional loss-on-drying technique with an automated primary method. A number of time-saving features have been incorporated into this design, such as the ability to automatically measure up to 16 samples at a time with optional drying time end point recognition, and intuitive touch-screen software with flexible method settings. The TGM800 is applicable to a wide variety of sample matrices including food, feeds, milled products, and agricultural materials, making it a versatile solution for many laboratories.
The TGM800 is a thermogravimetric analyzer designed to directly determine moisture content of materials using a loss-on-drying technique. Mass loss of the sample is measured as a function of the oven temperature while controlling the atmosphere and ventilation rate. The instrument consists of a computer, an integrated four place balance, and a multiple sample oven that allows up to 16 samples to be analyzed simultaneously.
After an analysis method has been selected, empty aluminum foil crucibles are loaded into the oven carousel. The analysis method controls the carousel, oven, atmosphere ventilation, and balance operation. On completion of crucible tare, each crucible is presented to the operator for sample loading. The initial sample mass is measured and stored automatically. Once all the samples have been loaded, the analysis starts with the oven temperature ramping to the set point, the beginning of ventilation, and the sequential collection of the individual sample masses. Crucibles are automatically indexed to the position above and lowered onto the balance pedestal where the sample mass is recorded. The mass loss of each sample is monitored, and the oven temperature and atmosphere ventilation rate is controlled according to the selected analysis method. Method analysis length can be programed to a fixed time or be dependent on the sample mass constancy. The moisture result is calculated as a percent mass loss for each sample and reported at the end of the analysis.
The instrument contains an intuitive touchscreen interface that enables complete access to analysis control, method settings, diagnostics, sample reporting, and more in a highly organized and immersive environment. Analysis methods can be tailored to satisfy most moisture applications with editable oven temperature, temperature ramp rate, atmosphere, and ventilation rate. The software also provides on-screen plotting of sample mass loss and temperature, as well as storing and managing all of the data and quantitative calculations.
The TGM800 maximizes lab efficiency, productivity, and analytical performance with a sample batch capacity up to 16 samples with sequential sample mass measurements occurring throughout the analysis process.