Mounting Bracket; Terminal Module; 2�3 Sensor Cartridge; Biased Sensor Cartridges - Honeywell Midas User Manual

2.2.1 Mounting Bracket

The metal mounting bracket has two slots that allow
the detector to be easily mounted to a wall using
two suitable screws (DIN rail or horizontal mounting
options are also available). For further details of
mounting the detector refer to

2.2.2 Terminal Module

The terminal module is located on the mounting
bracket. All electrical connections to Midas
made via this module. Wire entry to the terminal
module area is via the PG16 cable entry/conduit
entry located at the bottom of the mounting bracket
assembly.
2.3 Sensor Cartridge
A wide range of Flammable, Pyrophoric, Corrosive,
and Oxidizer (including Oxygen) sensor cartridges
can be fitted to Midas
®
are fitted in the sensor cartridge chamber at the
front of the main chassis. To access the chamber
the unit cover is removed by unscrewing the
thumbscrew located at the front of the detector. The
pre-calibrated smart sensor cartridges can easily
be fitted or replaced as they simply plug into the
detector without the need for any tools. The sensor
cartridge is firmly held in place by two locking tabs.
Some cartridges are shipped with a protective cap
to shield them from contaminants during shipping.
This cap must be removed before inserting the
cartridge into the Midas
damage the Midas transmitter.
®
Section 4.
. The plug in sensor cartridges
unit, failure to do so may
®
Diagram 2-5. Sensor cartridge
are
®
Front

2.3.1 Biased Sensor Cartridges

Some sensor cartridges are shipped with a battery
powered electrical supply in order to keep the cell
effectively 'warmed up' and ready to monitor once
installed in the Midas
circuits are supplied for TEOS, NO, and CO
bias circuit is removed just before insertion into
the Midas system and the sensor cartridge is thus
®
ready sooner for effective gas detection.
Should a bias voltage not be applied (e.g. during
a power failure), the cell will take a longer time to
recover before effective gas detection can take
place. The longer the loss of applied power, the
longer the recovery time. During this recovery time,
there is a chance for false/inaccurate readings.
Refer to the relevant sensor cartridge data sheet for
information on each sensor cartridge.
In order to avoid the risk of loss of gas detection
due to unforeseen power loss, we recommend that a
power management solution such as uninterruptible
power supplies are used.
2-4
Midas Gas Detector
®
Protective Cap
Locking tabs
R E M
O V E
A T T
I M E
I N S T
O F
A L L
A T I O
N
Back
unit. Battery powered bias
®
(remove before use)
Connector
. The
2