DG · Edition 08.13
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= To be continued
2
บริษัท เอดีดี เฟอร์เนส จ ำกัด
ADD FURNACE CO.,LTD.
44 ซอยบรมราชชนนี
70 ถนนบรมรำชชนนี แขวงศำลำธรรมสพน์ เขตทวีวัฒนำ กรุงเทพฯ 10170
โทร
: 02-888-3472
โทร
:
ออกแบ
บ
:
08-08-170-170
แฟกซ์
: 02-888-3258
https://www.add-furnace.com E-mail:
Contents
Pressure switch for gas DG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 2
1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.1 Examples of application......................................................5
1.1.1 Gas deficiency monitoring...............................................5
1.1.2 Differential pressure monitoring ....................................5
1.1.3 Systems leak tightness check...........................................5
1.1.4 Negative pressure monitoring.........................................5
1.1.5 Air line with minimum pressure and flow monitoring ....6
1.1.6 Low-pressure cut-off and high gas pressure protection
device......................................................................................6
2 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..7
2.1 Overview......................................................................8
3 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Positive pressure measurement........................................9
3.2 Negative pressure measurement .....................................9
3.3 Differential pressure measurement..................................9
3.4 Connection diagram........................................................10
3.4.1 Blue pilot lamp for 230 V AC or for 120 V AC ...............10
3.4.2 Pilot lamp with plug......................................................10
3.4.3 Red/green pilot LED for 24 V DC/AC or for 230 V AC ....10
3.4.4 Pilot LED with plug ........................................................10
3.5 Wiring...............................................................................11
3.6 DG in Zone 1 (21) and 2 (22) hazardous areas .................12
3.7 DG on pipes with Zone 2 (22) explosive atmospheres.... 13
3.8 Animation ........................................................................14
4 Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.1 Selection table ..................................................................15
4.2 Type code .........................................................................16
5 Project planning information . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 Installation ........................................................................17
6 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
6.1 Fastening set with screws, U-shape bracket.....................19
6.2 Connecting set ..................................................................19
6.3 External adjustment ............................................19
6.4 Pressure equalization element ............................19
6.5 Restrictor orifice...................................................20
6.6 Test key PIA ..........................................................20
6.7 Filter pad set ........................................................20
6.8 Tube set................................................................20
6.9 Standard socket set .............................................20
6.10 Standard coupler plug .......................................20
6.11 Pilot lamp set, red or blue .................................21
6.12 LED set, red/green.............................................21
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.1 Adjusting range, switching hysteresis ....................23
7.2 Safety-specific characteristic values for DG............24
7.2.1 Determining the PFHD value, the λD value and the
MTTFd
value.........................................................25
7.2.2 Calculating the PFHD ...........................................25
7.3 Dimensions .............................................................26
8 Maintenance cycles . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
9.1 Diagnostic coverage DC ...........................................27
9.2 Mode of operation ..................................................27
9.3 Category ..................................................................27
9.4 Common cause failure CCF .....................................27
9.5 Fraction of undetected common cause failures β ...27
9.6 B10d value................................................................27
9.7 T10d value................................................................27
9.8 Hardware fault tolerance HFT .................................27
9.9 Mean dangerous failure rate λD ..............................28
9.10 Safe failure fraction SFF..........................................28
9.11 Probability of dangerous failure PFHD ..................28
9.12 Mean time to dangerous failure MTTFd ..............28
