2. DESCRIPTION
2.1. Overview
The DAT 420 is a gas detector designed to detect the presence of toxic gases or oxygen deficien-
cy in ambient air. It operates using an electrochemical sensor whose measure is converted by the
transmitter into a 4-20 mA electrical signal which varies according to the gas/oxygen concentra-
tion. This signal is delivered to the control unit or to the Programmable Logic Controller (PLC)
through a 2-wire current loop.
The DAT 420 is suitable for:
▪ Use in hazardous areas other than mines (ATEX group II - equipment category 2);
▪ Use in zone 1 and 2 (gas) and 21 and 22 (dust) hazardous areas of explosive atmospheres;
▪ Operating at temperature from -10 °C to +40 °C for T6 temperature class.
The DAT 420 comprises the following main parts:
▪ The flameproof “d” metal sensing head.
▪ The flameproof “d” metal junction box.
▪ The flameproof “d” metal cable gland.
▪ The 2-position terminal block for electrical connection.
The overall assembly has a flameproof “d” type of protection and an IP6X ingress protection.
Figure 2: DAT 420 detector overview
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