Installation and Operation
AMI
Analyzer Manual
8
Apply the usual good-practice rules of mounting a piece of analytical equipment. For example do not to
mount it close to sources of electrical interference such as large transformers, motor start contactors,
relays etc. or in places where it will get a lot of vibration.
Mount the unit at a suitable eye level (so you can easily read the LCD and adjust the controls), not so close
to a wall on the right side that you will have a hard time connecting the gas lines.
Safety Considerations:
The unit is designed for installation in either a general purpose or a Class 1 Div 1 or Div 2 Group B,C,D area,
but it is also designed so that a hazardous gas may be introduced into its NEMA compartment. This gas may
be any group B,C or D gas.
The unit consists of two enclosures mounted on a back panel. The smaller enclosure on the left is
explosion-proof and contains the electrical connections for the user, and also the power supply and safety
components for the NEMA 4 enclosure.
The NEMA 4 enclosure contains the analytical circuitry, the sample handling components and the hydrogen
sulfide sensor. This circuitry is designed for intrinsic safety and meets requirements for Class 1 Div 1 Group
B,C,D.
There is an RS485 connection running ModBus available from the explosion-proof section. This may be
wired up permanently. There is also a USB port in the explosion-proof section that may be used
occasionally by removing the explosion-proof cap. If so, the area MUST be declassified first.
