Metek 920, Operator'S Manual With Essential Health And Safety Requirements

Page: 81 / 278

Installation and Start-Up | 3-21
Installing the Instrument Air Line
The Instrument Air line (by customer) must be 1/4" or 3/8" 316 stainless
steel tubing with appropriate 1/4" NPT or 3/8"-to-1/4" NPT (reducing)
connectors.
The Instrument Air must meet the ANSI/ISA-S7.0.01 (1996) specifications
at all times. If it cannot meet these requirements, an inlet filter system
must be installed.
The air must be supplied to the analyzer pressure regulator at a pressure
in the range of 415–830 KPAG (60–120 PSIG) and a flow rate of 60–120 L/
min (1–4 SCFM). These values may vary, depending on the application.
Instrument Air connections between the analyzer and the AMETEK
Heated Acid Gas (HAG) Sample Probe (if used) are discussed in the
HAG Sample Probe “Installation and Maintenance Guide.”
Ducting of Compressor Air
The point at which the compressor air enters the supply duct(s)
should be situated in a non-hazardous area.
The intake ducting to a compressor should not normally pass through
a hazardous area.
If the compressor intake line passes through a hazardous area, it
should be constructed of non-combustible material and protected
against mechanical damage and corrosion.
Adequate precautions should be taken to ensure that the ducting is
free from leaks in case the internal pressure is below that of the exter-
nal atmosphere. Additional protective measures (example, combustible
gas detectors) should be considered to ensure that the ducting is free of
flammable concentrations of gas or vapour.
To install the Instrument Air line:
1. Route the line from the Instrument Air supply to the analyzer.
2. Purge the line to remove any liquids or particulate in it before con-
necting it to the analyzer.

NOTE
!
WARNING