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Gas analysers IVE-50-4 are designed for continuous automatic measurements of volume fraction or mass concentration of combustible gases (CH4, C3H8, (C2-C10)-sum of hydrocarbons) and toxic gases (H2S, NH3, CO, NO2) in explosive gas environments. Can be used as a part of "Measuring complex IVE-50" and as a part of other measuring systems for measuring and recording the parameter "Gassiness" when assessing the state of the gas-air medium (GAM) during technological operations at hazardous production facilities, installed indoors and outdoors belonging to zones 0, 1 and 2. The built-in display shows the state of the HAC with a specified discreteness for the last hour. In gas analysers IVE-50-4 provided output signals: unified analogue output signal from 4 to 20 mA; digital signal via RS-485 interface with Modbus, MQTT, HART protocol; radio channel 868 MHz and GSM network (NB-IoT), LoRaWan; discrete signal of relay "dry" contact.