MF420 Gas sensor, Gas detector

MF 420 Gas sensor , Gas detector, Design of the gas measuring system The sensor sits in an approx. 46 mm long stainless steel probe tube. Cable entry is by means of a screwed cable gland (clamping area 6-10mm).The aluminium hosing incorporates: a four-digit, alphanumeric display, two buttons and the transmitter with a signal amplifier and a 4-20mA analog output . The transmitter processes and transmits the measured signals. It functions according to the three-wire system. Principle of operation The MF420-Ex-2 (Pellistor) gas measuring system determines the concentration of flammable gases and vapours in an explosive air mixture at an ambient temperature of -20 centigrade to +40 centigrade (optionally from -40 to +60centigrade). It is certified for use in areas subject to explosion hazards and has an EC Type Examination Certificate in accordance with Directive 94/9/EC (ATEX 100a) as follows: TPS 09 ATEX 1 421 X EX II 2G Ex dIICT6 Transmitter Power supply Cage clamp 0.5-2.5mm2 Voltage 24V DC ± 5% Current Approx. 105mA at 24V Connections Pin(-) 0V Pin(S) 4-20mA;max. Load 500 ohms Pin(+) 24 V DC ± 5% Ambient temperature -20 centigrade to 40 centigrade Temperature range -40 centigrade to +60 on request Air pressure 700 hPa to 1300 hPa Permissible humidity 10-95% relative humidity Non-condensing Output 4-20mA Hosing Aluminium alloy/stainless steel Silver Protection class of housing IP 65 Saltwater-proof Hosing weight Approx. 1,100 g Housing dimensions Approx. 84*H78mm Without probe tube and Screwed connection Connection cable 3*1.5mm2Cu+functional ground Shielded cable Display Four-digit alphanumeric display Displays measured value and/or staus Controls 2 buttons Certification EC Type Examination Certificate TPS 09 ATEX 1 421 X EX II 2G Ex dIIC T6 In accordance with Dirctive 94/9/EC (ATEX100a) Sensor Sensor type Pellistor Gas access By diffusion Measuring range 0-100% LEL Warm-up time Approx. 5 min