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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
Terminal block
Flameproof
sensing head
Flameproof junction box
Mounting bracket
Flameproof
cable gland
Ferrite
