The Vaisala HUMICAP HMT360 is an intrinsically safe humidity and temperature transmitter designed specifically for hazardous, potentially explosive environments (such as Zone 0 / Division 1). Vaisala docs portal Note: The HMT360 series has been officially discontinued by Vaisala and replaced by the updated Vaisala HMT370EX Series. Model Code Breakdown (HMT360 1A1A302...) Vaisala uses a modular order configuration matrix. Based on official Vaisala HMT360 Order Forms, your specific part number characters 1A1A302 indicate the following hardware configurations: Vaisala +2 1 (Transmitter Type): HMT361, which indicates the hardware is configured for wall mounting. A (Parameters): Configured to measure and output Relative Humidity (RH) + Temperature (T). 1 (Display): No display on the transmitter cover. A (Analog Outputs): Configured with 1 analog output channel (Ch1), delivering a 4…20 mA loop signal. 3 (Analog Output Parameter): Channel 1 is scaled specifically for Relative Humidity (0...100% RH). 0 (Analog Output Channel 2): No second analog output is configured. 2 (Analog Output Range for Temp): Configured for temperature scaling spanning -20…+60 °C (-4…+140 °F).