Datasheet MH-441D (Winsen) - 6

Zhengzhou Winsen Electronics Technology Co., Ltd. www.winsen-sensor.com
checksum
= (negation（byte1+byte2+……+byte7）)+1 For example. Byte0 Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8 Start bit Sensor no. Command - - - - - checksum 0XFF 0x01 0x86 0x00 0x00 0x00 0x00 0x00 0x79 Calculation method as follow: 1. except byte0, to add all of other bytes 0x1 + 0x86 + 0x00 + 0x00 + 0x00 + 0x00 + 0x00 = 0x87 2. negate to above value: 0xFF – 0x87 = 0x78 3. add 1 to above value 0x78 + 0x01 = 0x79
Eg.
char getCheckSum(char *packet) { char i, checksum; for( i = 1; i < 8; i++) { checksum += packet[i]; } checksum = 0xff – checksum; checksum += 1; return checksum; }
Intrinsically safe explosion-proof
➢ This product meets the standards of GB3836.1-2010 "Explosive Atmosphere Part 1: General Requirements for Equipment" and GB3836.4-2010 "Explosive Atmosphere Part 4: Equipment Protected by Intrinsically Safe "i"" standards”; the explosion-proof mark is Exib ⅡB T4 Gb, it is suitable for zone 1 and zone 2, contains Class IIA, T1-T3 explosive environment formed by the flammable gas, mixture of steam and air; it has passed the inspection by the National Quality Inspection Center for Explosion-proof Electrical Products and obtained the explosion-proof certificate. When using, please note the following: ➢ The intrinsically safe power supply must be used to power the sensor, otherwise the explosion-proof performance will be affected. ➢ It is forbidden to replace the sensor in dangerous places. ➢ It is forbidden to disassemble or replace the sensor element to avoid affecting the explosion-proof performance. ➢ It is not allowed to replace components or structures, so as not to affect the explosion-proof performance. ➢ The installation and wiring of the safety barrier must be carried out in accordance with the safety barrier instruction manual, and the safety barrier must obtain an explosion-proof certificate.
Connection diagram of intrinsically safe explosion-proof system
The on-site installation must comply with the relevant regulations of the GB3836.15—2000 "Electrical Equipment for Explosive Gas Environment Part 15: Electrical Installation in Hazardous Locations (Except Coal and Mines). Tel: 86-371-67169097 Fax: 86-371-60932988 4 Email: sales@winsensor.com