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1. What is CFM?
CFM is a common abbreviation in various fields, with different meanings in different scenarios. The core common interpretation of the circular block is as follows:
1. Aviation field: Cubic Feet per Minute. 1. It is a key unit for measuring air flow, commonly used in aircraft engines, ventilation systems, and other scenarios.
2. For example, the air flow of civil aircraft engines is usually calculated in CFM units, reflecting the volume of air inhaled or expelled per unit time.
.2. Financial field: Cash Flow Management 1. Refers to the planning, monitoring, and optimization of cash inflows and outflows by enterprises or individuals.
2. The core goal is to ensure a stable capital chain, which is commonly seen in financial management cracking and enterprise operation analysis.
.III. Common Definitions in Other Fields 1 Game Terminology: In some games (such as CrossFire Mobile), CFM stands for "CrossFire Mobile". 2. Engineering: In HVAC systems, CFM is used to represent the air delivery capacity of ventilation equipment. 3. Academic/Professional Abbreviations: Some institutions or projects may use CFM as an abbreviation for a specific name (depending on the specific scenario).
2. Characteristics of dust particle counter
Date and time display;
; USB high-speed communication interface; RJ-45 remote control communication interface; Built in COM serial printer interface; Count over limit alarm: The instrument can set six levels of count over limit alarms (corresponding to ISO levels 4 to 9): level 1, level 10, level 100, level 1000, level 10000, level 100000, and level 1000000; Compliant with ISO14644-1/GB50073-2001 (CLASS4, 5, 6, 7, 8, 9) 2010 version GMP (measurement of static and dynamic states at four levels A, B, C, and D), FS-209E (10, 100, 1000, 10000, 100000, 300000, 1000000) and other levels of testing, compliant with JJF-1190-2008 dust particle counter measurement calibration specifications and JIS B9921:1997 with ≤ 1 data memory per five minutes, capable of storing 1000 sets of measurement results; Can store 8000 sets of measurement results; Can store 100000 sets of measurement results; The built-in sensor can measure temperature and humidity and record and store them; 8 particle size channels can simultaneously measure particles of 0.3 μ m, 0.5 μ m, 0.7 μ m, 1.0 μ m, 2.0 μ m, 5.0 μ m, 7.0 μ m, and 10.0 μ m; Optional sizes include 0.3, 0.5, 1.0, 3.0, 5.0, 10 μ m, 15 μ m, and 20 μ m, with eight particle sizes counted simultaneously Test scope: Level 1 to 1 million (corresponding to ISO levels 4 to 9); Repeatability: Relative standard deviation ≤ 10%; Particle size accuracy: relative error ≤ 10%; Light source: laser diode is used as the light source for the sensor; Flow rate: 2.83 liters per minute (0.1 cfm) (error ≤± 5%); 28.3 liters per minute (1cfm) (error ≤± 5%); 50 liters per minute (1.77cfm) (error ≤± 5%); 100 liters per minute (3.54cfm) (error ≤± 5%); Maximum sampling time: 9 seconds; Self purification time: ≤ 10 minutes; Counting modes: cumulative counting mode, differential counting mode, concentration counting mode; Display: LCD or LED display, the former has higher maintenance costs, while the latter has lower maintenance costs. Power supply: Ni MH battery (14.8V/2600mAH) or AC adapter (input: 180-240V, output: 14.8V/3000mA); Battery working time: Continuous testing time is about 4 hours (Ni MH battery); And the latter with a direct 2