Chapter 10 • Alarms
10-10
Rev. 6, March 2011
Part 17997
Table 10-4 - Suggested Guidelines for Setting the Gas Level High Alarm Condition
10.4.1.2
Hourly Trend
The hourly trend alarm uses the following parameters:
•
HourTrAlr H
and
HourTrAlr HH
: Hourly trend High and High-High alarm set points.
•
HourTrAlr Delay
: The hourly trend alarm delay determines the period of time during
which the hourly trend must exceed the corresponding High and High-High alarm set
points in order to trigger the alarm. Accordingly, the hourly trend must get below the
alarm set point for the same amount of time in order to cancel the alarm. This delay is set
in percentage of the
period
of the hourly trend computation.
•
HourlyTr Period
: The period of time (in hours) during which the hourly trend is
calculated. Increasing the period decreases the normal fluctuations of the readings, but
increases the response time.
The readings of the Hydran 201
i
System should be monitored over a minimum period of
two weeks before setting these parameters; follow the same rules as for the gas High alarm
(see Section 10.4.1.1 on page 10-9).
10.4.1.3
Daily Trend
The daily trend alarm uses the following parameters:
•
DayTrAlr H
and
DayTrAlr HH
: Daily trend High and High-High alarm set points.
•
DayTrAlr Delay
: The daily trend alarm delay determines the period of time during
which the daily trend must exceed the corresponding High and High-High alarm set
points in order to trigger the alarm. Accordingly, the daily trend must get below the alarm
set point for the same amount of time in order to cancel the alarm. This delay is set in
percentage of the
period
of the daily trend computation.
Hydran 201T
i
Maximum Reading
Obtained During the Monitoring Period
Minimum Suggested Alarm Set Point
to Reduce the Likelihood of Unnecessary Alarms
Below 70 ppm
100 ppm
From 70 to 400 ppm
1.5 times the highest H201T
i
reading
Above 400 ppm
200 ppm above the highest H201T
i
reading
Содержание Hydran 201i
Страница 1: ...GE Energy Services Digital Energy Hydran Instruction Manual 201i System ...
Страница 6: ...Instruction Manual vi Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 8: ...Instruction Manual viii Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 22: ...Instruction Manual xxii Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 36: ...Chapter 1 Introduction 1 10 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 72: ...Chapter 3 Hydran 201Ci Controllers 3 16 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 114: ...Chapter 5 Before Installation 5 16 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 143: ...Installation Part 17997 Rev 6 March 2011 6 29 Figure 6 9 Installing the CPU Module ...
Страница 176: ...Chapter 8 Hydran 201Ci 1 Installation 8 16 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 190: ...Chapter 9 Communications and Networking 9 14 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 216: ...Chapter 11 Operating the Hydran 201i System 11 8 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 236: ...Chapter 12 Troubleshooting 12 20 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 244: ...Chapter 13 Maintenance 13 8 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 254: ...Appendix B Mechanical Drawings B 2 Rev 6 March 2011 Part 17997 Figure B 3 1 5 In Adaptor ...
Страница 255: ...Hydran 201Ti Intelligent Transmitter Part 17997 Rev 6 March 2011 B 3 Figure B 4 1 In Adaptor ...
Страница 262: ...Appendix C Functional Block Diagrams C 4 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 282: ...Appendix F Default Values of the Parameters F 4 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 284: ...Appendix G Unit Conversions G 2 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 298: ...Appendix I Glossary I 12 Rev 6 March 2011 Part 17997 PAGE LEFT INTENTIONALLY BLANK ...
Страница 299: ......