5
2 GENERAL DESCRIPTION
The MIDAS
®
gas detector is an extractive gas sampling system that draws a sample locally or from a remote
point to a sensor cartridge that is located inside the detector’s chassis. A wide range of toxic, flammable
and oxygen gas sensor cartridges are available that enable detection of gases used or generated in the
Semiconductor and other manufacturing industries.
MIDAS
®
is wall mounted and displays gas concentration, alarm, fault and status information via its backlit LCD
and LEDs. A simple to use 4-button keypad located under the display provides the facility to set-up, review,
operate and make changes to the detector’s configuration.
MIDAS
®
has flexible power and communications capabilities built in as standard. These include 3 on board
relays, 0-22 mA analog output, Modbus/TCP outputs for signal and service connectivity as well as the innovative
Power over Ethernet (PoE) protocol that enables a single Ethernet connection to be made for all power, control
and communication requirements.
3 PRODUCT OVERVIEW
The MIDAS
®
gas detector comprises of 4 parts: the main chassis, the mounting bracket assembly, the sensor
cartridge and the unit cover. Diagram 1 details the MIDAS
®
general arrangement. Additionally, there is an
optional Pyrolyzer module required for the detection of NF
3
and an optional Analog module for the connection of
external 4-20 mA devices. Please refer to section 10 and 11 respectively for details of these options.
Main chassis
Unit cover
Sensor cartridge
Mounting
bracket
assembly
Diagram 1. MIDAS
®
general arrangement exploded view