Introduction to DHLR-4000A Fully Automatic Calorimeter

1、 Overview

This instrument is a multifunctional calorimeter developed using a single-chip microcomputer, mainly used for measuring the heat generation of solid and liquid combustibles such as coal, petroleum, food, wood, explosives, and other substances.

This instrument is a new type of energy-saving analysis instrument newly developed by our company. The carefully designed calculation program greatly improves the measurement accuracy. It adopts a liquid crystal display, fully displays in Chinese, is easy to operate, and can achieve full automatic control of the measurement process. It can automatically add water and drain, ignite, stir, calculate, and print the calorific value of the measured substance. The test results are clear at a glance. It is an ideal equipment developed for enterprises and research institutions that produce and study combustibles, as well as scientific research and military departments in colleges and universities.

2、 Technical features

Compared with similar machines, this instrument has the following characteristics:

1. This machine is composed of a high-end microcontroller, with a simple structure, reliable performance, and strong anti-interference ability.

2. The automatic addition of water, drainage, mixing, ignition, temperature measurement, calculation, calibration, printing, and experimental processes have achieved full automation, avoiding human errors and greatly improving accuracy and precision.

3. The automatic cooling calibration of the experiment has a relaxed requirement for environmental temperature, which not only improves the accuracy of the experiment, but also ensures the stability of the instrument during long-term operation.

4. After the experiment, the high and low heat generation can be converted for printing, which is more in line with general conventional experiments.

5. Full Chinese display, easy to operate.

3、 Working principle

This instrument is suitable for measuring the calorific value of substances that can completely burn in high-pressure oxygen, as well as substances that can burn in vacuum.

The principle of measuring the heat generation of a substance in high-pressure oxygen is as follows:

First, place the standard weight sample in a heat-resistant and corrosion-resistant stainless steel crucible. Place the crucible in a stainless steel cylinder, tighten the cylinder cap, and then fill the oxygen cylinder with oxygen at a pressure of about 3.0 Mpa. Then place it in a circular inner cylinder. When the sample inside the cylinder is ignited by electricity, the heat generated by the combustion of the sample is conducted to the inner cylinder water through the cylinder wall. Based on the increase in water temperature and the heat capacity of the calorimeter system (including the water cylinder and oxygen cylinder), the heat generation of the sample can be calculated. The water in the water sleeve is basically constant, and the heat exchange between the water cylinder and the outer water sleeve during the experiment can be corrected through appropriate calculations.

4、 Technical features

Main technical parameters