Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 54)

<5. INSTALLATION AND WIRING> 5-21
IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
5.11.3 Purging Analyzer and Universal Power Supply and/or URD for Hazardous
Areas (with On-Line Validation)
• NEC/CSA Class 1, Division 2, Groups A-D
• ATEX Zone 2 CAT 3 – Dual regulators must be used on the inlet!
The block diagram below shows the sections of the analyzer that require nitrogen purging when using in
conjunction with either or the Universal Power Supply and Universal Remote Display. AZ-Type purge control
system is fitted the Launch Unit and it includes a local indicator (Bright Green, rugged light) and pressure switch
alarm contacts (open on loss of purge pressure).
5.11.4 Purging Analyzer and Universal Power Supply and/or URD (not using On-Line Validation)
• NEC/CSA Class 1, Division 2, Groups A-D
• ATEX Zone 2 CAT 3 – Dual regulators must be used on the inlet!
The block diagram below shows the sections of the analyzer that require nitrogen purging. A Z-Type purge
control system is fitted the Launch Unit and it includes a local indicator (Bright Green, rugged light) and
pressure switch alarm contacts (open on loss of purge pressure). The purging should be carried in sequence
typically as shown below. All purge gas connections are ¼” od Tube fittings.
TDLS200 TDL Analyzer Instruction Manual V2.1
Page 49 of 131 - 49 -
3.9.2 Purging Analyzer for Hazardous Areas (without On-Line Validation)
• Z-Purged designed in accordance with NEC/CSA Class 1, Division 2, Groups A-D
• Certified ATEX Zone 2 CAT 3 – Dual regulators must be used on the inlet!
The block diagram below shows the sections of the analyzer that require nitrogen purging.
A Z-Type purge control system is fitted the Launch Unit and it includes a local indicator
(Bright Green, rugged light) and pressure switch alarm contacts (open on loss of purge
pressure).
Figure 28 - Purge Flow Diagram when not using on line validation
3.9.3 Purging Analyzer and Universal Power Supply and/or URD for Hazardous
Areas (with On-Line Validation)
• Z-Purged designed in accordance with NEC/CSA Class 1, Division 2, Groups A-D
• Certified ATEX Zone 2 CAT 3 – Dual regulators must be used on the inlet!
The block diagram below shows the sections of the analyzer that require nitrogen purging when
using in conjunction with either or the Universal Power Supply and Universal Remote Display. A Z-
Type purge control system is fitted the Launch Unit and it includes a local indicator (Bright Green,
rugged light) and pressure switch alarm contacts (open on loss of purge pressure).
Figure 29 - Purge Flow Diagram when using on line validation
Main
Electronic
Housing &
Purge
System
Laser
Module
Check Gas
Flow Cell
Proce
ss
Inte
rfa
ce
Proce
ss
Inte
rfa
ce
Detect
Module
Detect
Electronic
Housing
Nitrogen or I/A Purge
Gas
Nitrogen or I/A Purge
Gas
Power
Supply
or URD
Main
Electronic
Housing &
Purge
System
Laser
Module
Check Gas
Flow Cell
Pr
oce
ss
Int
erf
ac
e
Pr
oce
ss
Int
erf
ac
e
Detect
Module
Detect
Electronic
Housing
Nitrogen or I/A Purge Gas
Figure 49 - Purge Flow Diagram when using on line validation
Nitrogen or I/A Purge
Gas
Check Gas
Flow Cell
Detect
Electronic
Housing
TDLS200 TDL Analyzer Instruction Manual V2.1
Page 50 of 131 - 50 -
3.9.4 Purging Analyzer and Universal Power Supply and/or URD (not using On-Line
Validation)
• Z-Purged designed in accordance with NEC/CSA Class 1, Division 2, Groups A-D
• Certified ATEX Zone 2 CAT 3 – Dual regulators must be used on the inlet!
The block diagram below shows the sections of the analyzer that require nitrogen purging. A Z-
Type purge control system is fitted the Launch Unit and it includes a local indicator (Bright Green,
rugged light) and pressure switch alarm contacts (open on loss of purge pressure). The purging
should be carried in sequence typically as shown below. All purge gas connections are ¼” od Tube
fittings.
Figure 30 - Purging Analyzer for Hazardous Areas -NO- On-Line Validation
Main
Electronic
Housing &
Purge
System
Laser
Module
Check Gas
Flow Cell
Process Interface
Process Interface
Detect
Module
Detect
Electronic
Housing
Nitrogen or I/A Purge Gas
Power
Supply
or URD
Figure 50 - Purging Analyzer for Hazardous Areas -NO- On-Line Validation
Main
Electronic
Housing
& Pureg
System Detect
Electronic
Housing
Power
Supply
or URD
Check Gas
Flow Cell