JJF 1433-2013 "Specification for calibrating chlorine detection alarms" applies to chlorine detection alarms with a Measurement range of (0~ 10) μmol/mol to (0~ 1 000) μmol/mol. Miscellaneous instruments for chlorine detection can be calibrated with reference to this specification. This specification refers to GB 12358-2006 "General technical requirements for workplace environment Gas detection alarms", GB 50493-2009 "Petrochemicals flammable gas and toxic Gas detection alarm design specifications" and HG/T 23006-1992 "toxic Gas detection alarms technical conditions and detection methods" and other relevant standards. Chlorine detection and alarm instrument mainly adopts diaphragm electrode type, fixed potential electrolysis type or semiconductor type Detector. Sampling method includes diffusion type and suction type. Its main structure is composed of detection element, amplifier circuit, alarm system and display.