Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 87)

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IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<6. BASIC OPERATION>
TIME SEQUENCE
• It can happen only when there is no active auto calibration or validation.
• When time counting is up,
o Turn off the current valve.
o Turn on the next valve.
o Start the new time counting.
o Multiple valve time sequences are allowed. When configure the parameters, please pay attention.
Time sequence is not recommended to use with remote control at the same time to avoid valve
chaos.
REMOTE CONTROL
• The remote initiate contacts are found at TB-2 and the external contact MUST BE VOLTAGE FREE.
The TDLS200 circuits are low level current monitoring so any externally applied voltage/current
may cause damage to the analyzer, hence use voltage free contact only.
• It can happen only when no auto calibration or validation is on-going.
• Direct control from DCS and or local/remote switch(s)
• Contact signal -> valve on (please keep remote contacts closed for at least 10seconds to ensure the
analyzer reads/registers the contacts at measurement up-date)
• Open signal -> valve off (please keep remote contacts closed for at least 10seconds to ensure the analyzer
reads/registers the contacts at measurement up-date).
AUTO CALIBRATION & VALIDATION – see separate section of User Guide for details
1. Remember the current valve status.
2. Turn on the assigned valve, turn off other valves.
3. Resume the original valve status before auto calibration or validation.