Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 53)

<5. INSTALLATION AND WIRING> 5-19 5-20
IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
5.11.1 Purging Analyzer 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. 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.
5.11.2 Purging Analyzer for Hazardous Areas (without 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 pres-
sure switch alarm contacts (open on loss of purge pressure).
Figure 48 - Purge Flow Diagram when not using on line validation
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
Main
Electric
Housing
& Purge
System
Detect
Electronic
Housing
TDLS200 TDL Analyzer Instruction Manual V2.1
Page 48 of 131 - 48 -
3.9 Hazardous Area Systems
The TDLS200 Analyzer requires a continuous nitrogen gas purge to prevent ambient oxygen
ingress to the optical path, when oxygen is the measured gas. The flow rate can be minimized as
long as it prevents any ambient oxygen ingress to the measurement optical path. Other purge
gases may be used as long as they do not contain any of the measured gas and are clean, dry,
etc.
For hazardous area operation, the same nitrogen purge gas is used to purge the entire analyzer
(including non-optical path sections such as the electronics).
The process interface may also require purging to maintain clear windows, refer to Process
Window Purge details separately.
NOTE: Please also refer to any separate Purge System Original Manufacturers Operating
Instructions and Manuals in conjunction with this Instruction Manual.
The Purge Systems are not manufactured by Yokogawa Laser Analysis Division.
3.9.1 Purging Analyzer 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. 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 27 - 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
Figure 47 - Purge Flow Diagram when using on line validation
Main
Electric
Housing
& Purge
System
Detect
Electronic
Housing
Nitrogen or I/A Purge
Gas
Check Gas
Flow Cell