This instrument is based on national standards GB/T 14684-2001《 Designed and manufactured in the requirements for the determination of stone powder content in construction sand, and can be used for the construction materials verification laboratories of construction, transportation and other departments to determine the content of stone powder. according to GB/T 14684-2001 According to the standard, users can choose the following two test methods:
　1、methylene blue MB Value determination method；
　2、Methylene blue rapid test method.
　
1. Main technical characteristics
1、This instrument is a bench-type structure and consists of an electric stirring device, a speed time automatic controller, a measuring cup holder, etc.
2、The electric stirring device consists of a base, a column, a cross chuck and a stirring motor. The output of the speed measurement motor is used to achieve stable and adjust the speed.
3、Microcomputer technology is used to collect and process data, and the specified operating steps are automatically implemented according to the selected method, and the time and speed are displayed.
　
2. Main technical parameters and indicators
1、Automatic stirring speed control: 600 ±60r/min；  400±40r/min；
2、Timing device: maximum 90 minutes, resolution 1 second；
3、Speed ​​measurement error:         ±2r/min；
4、Mixing impeller:             Φ75±10mm；
5、Glass bottle capacity: 11；
6、Automatic control function: Methylene blue can be selected MB Assay or methylene blue rapid test method.