Pressure switch for gas DG
Contents
1. 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 dafd ess suite ssscsbedeebedesterene 22 7 1 Adjusting range switching hysteresis 23 7 2 Safety specific characteristic values for DG 24 7 2 1 Determining the PFHp value the Ap value and the MTIFA4ValUe caccucieekr ear hee techo LR bee tec 25 7 2 2 Calculating the PFHp 25 F3 DIMENSIONS Pm 26 8 Maintenance cycles 26 DUGNOSSONY a EI A en nee se uen rico 27 9 1 Diagnostic coverage DC 27 9 2 Mode of operation 27 9 3 Category 4 4 27 9 4 Common cause failure CCF 27 9 5 Fraction of undetected common cause failures B 27 9 6 Bigg Valle asisten T Re get 27 97 Tijd Valle cocer ee det Eta eda ee e eid 27 9 8 Hardware fault tolerance HFT 27 9 9 Mean dangerous failure rate Ap 28 9 10 Safe failure fraction SFF 28 9 11 Probability of dangerous failure PFHp 28 9 12 Mean time to dangerous failure MTTFg 28 v 3 To be continued 2 Contents 913 Demand rale Mop eesse ose decks n ane Spa c od 28 9 14 Average probability of dangerous failure on demand PFDayg E scutes dede duda dg Ett2. DG Edition 08 13 ner Mm wy fw NI A O 0 standard O available K2 T T2 N A OT OTOT OO K2 T N A O O O O ner B 4 2 Type code DG HT DG NT Code Description 2 Ww NPT DG Pressure switch for gas 1 5 Negative pressure adjusting range 1 5to 0 5 0 5to 3 mbar 6 Adjusting range 0 4to 6 mbar 10 Adjusting range 1to 10mbar 12 Negative pressure adjusting range 12t0 1 4 1t0 7 mbar 18 Negative pressure Adjusting range 2to 18 mbar 30 Adjusting range 2 5to 30 mbar 50 Adjusting range 2 5to 50 mbar 120 Negative pressure adjusting range 10to 120 mbar 150 Adjusting range 30to 150 mbar 400 Adjusting range 50to 400 mbar DG U DG H DG N DG 450 Negative pressure adjusting range 80to 450 mbar ports 1 and 2 Rp 1 standard 500 Adjusting range 10010 500 mbar is 3 and 4 Rp Vs standard B Positive pressure poris e and Sp 7g Standardi U Positive pressure negative pressure differential pressure DG B DG S H Locks off with rising pressure N Locks off with falling pressure port 1 Rp 1 4 standard Negative pressure for gas DG T DG HT DG NT S Positive pressure only for oxygen and ammonia i T RID T T product port 1 1 4 NPT standard or G With gold plated contacts ports land 2 1 4 NPT available Electrical connection port 4 1 4 NPT standard 3 via screw terminals 4 via screw terminals IP 65 5 via 4 pin plu
3. Too little Sufficient Too wide No answer Scope in te r active My scope of functions Technical department Sales No answer Kromschr der 03250743
4. taining silicone or oil R 220Q Pons NO 2 COM Ne 3 4 In the case of high humidity or aggressive gas components H2S we recommend using a pressure switch with gold con tact due to its higher resistance to corrosion Closed circuit current monitoring is recommended under difficult operating conditions All DG models except DO l NO o COM 4 Contacts 3 and 2 close when subject to increasing pressure Contacts 1 and 3 close when subject to falling pressure DG Edition 08 13 KP or DG 18l DG 1201 DG 4501 Contacts 3 and 2 close when subject to increasing nega tive pressure Contacts 1 and 3 close when subject to falling negative pressure DG 1 51 and DG 121 The connection of DG 1 5 and DG 12l depends on the positive or negative adjusting range DG 1 51 In the negative adjusting range the template which can be found in the unit displays the connection diagram In the positive adjusting range remove the template and wire the unit as shown in the engraved connection diagram NO 207 COM NC oT 3 1 um t Functol 3 6 DG in Zone 1 21 and 2 22 hazardous areas Pressure switch DG can be used in Zone 1 21 and 2 22 hazardous areas if an isolating amplifier is installed upstream in the safe area as Ex i equipment pursuant to EN 60079 11 VDE 0170 7 2007 DG as simple electrical equipment pursuant to EN 60079 11 2007 corresponds to the Temperature clas
5. 0 6 mA Order No 74923275 il 2 3 DG Edition 08 13 KP or 21 7 Technical data Gas type natural gas town gas LPG gaseous flue gas biologically produced methane max 0 1 by vol H5S and air DG max inlet pressure p max 600 mbar 8 5 psig Max test pressure for testing the entire system temporarily lt 15 minutes 2 bar 29 psig Switching capacity DG U 24 250 V AC 20 05 5A at cos 1 0 05 1 at cos 0 6 DG G U 5 250 V AC 20 01 5Aat cos p 1 0 01 1A at cos 0 6 DG G U 5 48 V DC 0 01 1 A DG T U 30 240 V AC I25Aatcoso 1 0 5 A at cos 0 6 DG TG U lt 30 V AC 20 lAatcosoz 1 0 05 A at cos 0 6 If the DG DG TG has switched a voltage gt 24 V gt 30 V and a current gt 0 1 at cos o 1 or gt 0 05 Aat cos 0 6 once the gold plating on the contacts will have been burnt through It can then only be operated at this power rating or higher power rating DG Edition 08 13 ner Maximum medium and ambient temperatures DG B DG U DG I DG S 15 to 80 C 5 to 176 F DG H DG N 15 to 60 C 5 to 140 F DG T DG HT DG NT 40 to 60 C 40 to 140 F Storage and transport temperature DG 40 to 80 C 40 to 176 F DG T 40 to 60 C 40 to 140 F ROHS compliant pu
6. 0 9 0 8 1 5 0 31 0 59 3 5 1 17 1 95 5 15 8 17 3 12 6 63 Mean switching differential at min and max setting mbar 02 05 0 5 1 O 5 15 4 1 10 30 Difference between switching eo and possible reset mbar WC 0 4 1 0 16 0 39 1 2 0 39 0 78 2 5 0 78 1 95 AS 1 56 6 63 parl A Deviation from the switching point during testing pursuant to EN 1854 Gas pres sure switch 15 15 1596 15 15 15 15 15 HoE Ho Hh H 15 15 15 15 Ho Ho Air pressure switch 15 or 0 1 mbar 0 04 WC 15 or 0 1 mbar 0 04 WC x 1596 x 1596 x 1596 x 1596 x 1596 x 1596 x 1596 x 1596 x 1596 x 1596 Deviation from the switching point during testing pursuant to EN 1854 Gas pressure switch x 1596 x 1596 x 1596 x 1596 x 1596 Air pressure switch x 1596 or 0 4 mbar 15 or 0 5 mbar 15 or 0 5 mbar x 1596 15 23 7 2 Safety specific characteristic values for DG For SIL Suitable for Safety Integrity Level Diagnostic coverage DC Type of subsystem Mode of operation For PL Suitable for Performance Level Category Common cause failure CCF Application of essential safety requirements Application of tried and tested safety requirements For SIL and PL U 24 V DC 10 mA U 230 V AC 4 mA U 24 V DC 70 mA U 230 V AC 20 mA U 230VAC 1 2A Hardware fault tolerance 1 component switch HFT Hardware fault toler
7. Hand wheel i WC mbar conduit Screw plug Pilot lamp 1 4 NPT 1 8 NPT Micro switch Filter pad E Measurement nozzle 1 1 4 NPT point DG T 0 3 mm The pressure switch DG switches in the event of increasing or decreasing pressure Once the set switching point is reached a micro switch is activated in the DG which is designed as a change over contact Increasing negative pressure Decreasing negative pressure Increasing pressure Decreasing pressure 49 5 4 5 91 28456 The switching pressure is adjusted using a hand wheel DG Edition 08 13 k Lu Am 3 Positive pressure measurement Positive pressure measurement is designed for example for checking the fan function or measuring the min max gas pressure The positive pressure is measured in the lower diaphragm chamber port 1 or 2 The upper diaphragm chamber is ventilated via port 3 or 4 3 2 Negative pressure measurement Negative pressure measurement air flue gas is designed for example for monitoring a suction pressure blower The nega tive pressure is measured in the upper diaphragm chamber port 3 or 4 and on DOG T via port 4 The lower diaphragm chamber is ventilated via port 1 or 2 In the case of DG I the negative pressure gas air flue gas or biologically produced methane is measured in the lower diaphragm chamber port 1 or 2 The upper diaphragm cham ber is ventilated via port 3 or 4 3 3 Differential pr
8. C type tested and certified CE pursuant to Gas Appliances Directive 2009 142 EC in conjunction with EN 1854 Class S Meets the requirements of the Low Voltage Directive 2006 95 EC Declaration of conformity D GB see cb AGA approval Australian Gas Association Approval No 5484 http www aga asn au product_directory DG Edition 08 13 ner Approval for Russia c Certified by Gosstandart pursuant to GOST R Approved by Rostekhnadzor RTN Scan of the approval for Russia RUS see ind of document Certificate gt DG B12185 nationales Zerti ikat Russland RUS DG T FM approval APPROVED Factory Mutual Research Class 3510 Flow and pressure safety switches Designed for applications pursuant to NFPA 85 and NFPA 86 www approvalguide com DG T UL approval c Mus LISTED UL 353 Limit control Underwriters Laboratories www ul com gt Certification Approval does not apply to DG S DG S complies with the re quirements of the Low Voltage Directive 2006 95 EC 2 1 Overview u 2006 95 EC CE 2009 142 EC EN 1854 a AGA APPROVED c Mus LISTED DG Edition 08 13 DG B DG U DG H DG N DG I DG T DG S ner 3 Function Hand wheel MI6 x 1 5 mbar A FP V8 Screw plug Rp 1 4 Micro switch 2 a Nozzle R 1 m DG 0 8 mm Pl Measurement point 1 2 NPT
9. L d SIL 2 3 178E 10 1 h 0 000 E 0 PL e SIL 3 PFHD Probability of dangerous failure HDMI 1 hour PFDavg Average probability of dangerous failure on de mand LDM AD Mean dangerous failure rate 1 hour MTTFg Mean time to dangerous failure hours nop Demand rate mean number of annual operations 1 hour DG Edition 08 13 Ii ner 25 7 3 Dimensions Rp Holes 10 mm 0 4 deep for self tapping screws 8 Maintenance cycles 4 x 3 6 0 14 Rp a a Va NPT 0 77 AS m Le STU 7 4 y 7 N S zo T 3 We 1 8 4 ws oe N 13 0 51 Ml xis 30 51 21 2 NPT Conduit At least once a year twice a year in the case of biologically produced methane DG Edition 08 13 LM or 26 9 Glossary 9 Diagnostic coverage DC Measure of the effectiveness of diagnostics which may be determined as the ratio between the failure rate of detected dangerous failures and the failure rate of total dangerous failures NOTE Diagnostic coverage can exist for the whole or parts of a safety related system For example diagnostic cover age could exist for sensors and or logic system and or final elements Unit 96 from EN ISO 13849 1 2008 9 2 Mode of operation High demand mode or continuous mode Operating mode where the frequency of demands for opera tion made on a safety
10. MT a e a e 28 Ee eol 1o e ie ce eee a dei PE 29 COMICS Soest es RR Med Nes ers ye ree 29 DG Edition 08 13 v 3 To be continued ner 1 Application DG U 3 Adjustable switching point DG H DG N DG H switches and locks off with rising pressure DG N switches and locks off with fall ing pressure Manual reset The gas pressure switch DG monitors extremely low pressure differentials and triggers switch on switch off or switch over operations if a set switching point is reached The switching point is adjustable via a hand wheel It monitors positive and negative gas pressures on various industrial gas and air appliances such as boiler fan monitor ing and differential pressure monitoring in firing ventilation and air conditioning systems The T V tested special design pressure switch is used as defined by VdTUV Code of Practice Druck 100 1 Pressure 100 1 in firing installations for steam and hot water generators in accordance with TRD 604 Para 3 6 4 as well as class S for DG B DG U and DG I pursuant to EN 1854 DG Edition 08 13 DG 6 With fitted socket pursuant to DIN EN 175301 803 Type DG B DG U DG T DG H DG N DG HT DG NT DG DG S Positive pressure Gas air flue gas or biomethane Gas air flue gas or biomethane Gas air flue gas or biomethane Air or flue gas NH3 or Oo DGA Hand wheel with WC and mbar scale NPT conduit f
11. Pressure switch for gas DG Technical Information GB 4 Edition 08 13 1G ch 9 CE xdi d LISTED Monitoring of gas and air pressures positive negative and differential pressures EC type tested and certified pursuant to EN 1854 and class S DG T FM approved and UL listed Certified pursuant to GOST R and AGA Certified for systems up to SIL 3 and PL e Pressure switch with internal lock and manual reset Suitable for biologically produced methane can be used on pipes with Zone 2 explosive atmospheres without isolating amplifier With approved isolating amplifier for Zone 1 and 2 hazardous areas RoHS 2002 95 EC DG S special version available for NH and O Pier Contents Pressure switch for gas DG COMENS 25 ess eei bep bre e329 90284G8S EG SS 2 Nee o CR EERERETCTTTERTRC ET 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 MOVIES MT 6 2 COMMCONON sicot E XopERIDES REPRISE RA 7 2 OVSIVIQW us pan mm bte dace edet bete cte ed 8 SIFUNCHON 510 005 0 00 99 20 rame een eee ae Raves 9 3 1 Positive pressure measureme
12. Reader in the Down load section and follow the instructions If the animation does not start to play you can download it from the document library pocuthed as an independent application 4 Selection 4 Selection table DG B for positive pressure DG U for positive pressure negative pressure and differential pressure Type 6 10 30 50 150 400 500 B U G 3 4 5 6 7 8 9 ee o o o ojoo e o eo o o Order example DG H DG N for positive pressure negative pressure and differential pressure DG H locks off with rising pressure DG N locks off with falling pressure Type 6 10 30 50 150 400 500 H N G 3 4 5 6 7 8 9 DG e e oe 00e o e e O e o O o DG S for positive pressure for oxygen and ammonia without approval Type 6 10 30 50 150 400 500 S G 3 4 5 6 7 8 9 DG oe oe eo e O O DG I for negative pressure Type 15 12 18 120 450 G 3 4 5 6 7 8 DG oO e e e e e e e a EON DG T for positive pressure negative pressure and differential pressure with NPT connection Typ 6 10 50 150 SOON ood S DG e Oo o e e 0 0 DG HT DG NT for positive pressure negative pressure and differential pressure DG HT locks off with rising pressure DG NT locks off with falling pressure Typ 6 10 50 150 50008 Mi MM r CS DG o o e e 0 00e On DG T the blue pilot lamp for 120 V AC is fitted On DG TG the red green pilot LED for 24 V DC AC is fitted
13. The connection to Zone 2 Zone 22 must be implemented via one of the two 1 4 threads Even in the unlikely event of a break in the diaphragm there is no danger of flashback into the sys tem The pressure compensation holes on the pressure switch V4 connections have a defined ignition protection in terms of the safety measure for enclosed break devices for Group IIA gases and vapours pursuant to IEC EN 60079 15 2005 In the case of Zone 22 it must be ensured that dirt particles do not block the pressure supply hole 0 8 mm DG Edition 08 13 13 3 8 Animation DG Sollwerteinstellung Setpoint adjustment Mikroschalter Micro switch Membrane Membranteller Diaphragm i Diaphragm plate Anschluss f r berdruck Gas Luft Connection for positive pressure gas air The interactive animation shows the function of the gas pres sure switch DG Click on the picture The animation can be controlled using the control bar at the bottom of the window as on a DVD player To play the animation you will need Adobe Reader 7 or a newer version If you do not have Adobe Reader on your system you can download it from the Internet DG Edition 08 13 Teilebezeichnung Part designation intei m P Anschluss f r Unter druck Luft 5 Connection for negative pressure air EC Messpunkt f r berdruck Measurement point for positive pressure Go to www adobe com click on Adobe
14. ance 2 components switches redundant operation HFT DG Edition 08 13 SIL 2 3 0 Type A to EN 61508 2 7 4 3 1 2 High demand mode pur suant to EN 61508 4 2001 3 5 12 PLa b cd e 2 1 2 8 4 gt 65 Satisfied Satisfied Biog value 6 689 477 operating cycles 4 414 062 operating cycles 974 800 operating cycles 0 KP or gt 90 2 2 Safe failure fraction SFF Fraction of undetected com mon cause failures B Max service life under operating conditions 10 years after date of production plus max 1 2 year in stor age prior to first use or once the given number of operating cycles has been reached depending on which is achieved first The pressure switches are suitable for single channel systems HFT 0 up to SIL 2 PL d and up to SIL 3 PL e when two re dundant pressure switches are installed in a double channel architecture HFT 1 provided that the complete system com plies with the requirements of EN 61508 ISO 13849 For a glossary of terms see page 27 Glossary 24 Technical data Safety specific characteristic values for DG 7 2 1 Determining the PFHp value the Ap value and the MTTF value Hess 7 2 2 Calculating the PFHp Switch cap 24 V 10 mA 230 V 4 mA Nop Nop Cycle time Biod Tod PFHp 159 PFDayg 1 DG suitable for PFHp 2 DG PFDayg 2 DG suitable for 0 1 M a ein 1 00 1 h 8 760 1 a 3 600 s 6 689 477 100 a 1 495E 8 1 h 0 000 E 0 P
15. essure measurement Differential pressure measurement is designed for instance for safeguarding an air flow rate or for monitoring filters and fans DG U DG H DG N the higher absolute pressure is connected to port 1 or 2 and the lower absolute pressure to port 3 or 4 The remaining ports must be tightly plugged er 3 4 Connection diagram 3 4 2 Pilot lamp with plug Contacts 3 and 2 close when subject to increasing pressure Contacts 1 and 3 close when subject to falling pressure All DG models except DG N switch with rising pressure The contact switches from NC 1 to NO 2 DG N switches with falling pressure The contact switches from NO 2 to NC 1 DG H and DG N are locked off in their switched state and can only be unlocked with a manual reset 3 4 1 Blue pilot lamp for 230 V AC or for 120 V AC DG Edition 08 13 10 3 5 Wiring If the DG G has switched a voltage gt 24 V and a current gt 0 1 A at cos 1 or gt 0 05 A at cos 0 6 once the gold plating on the contacts will have been burnt through It can then only be operated at this power rating or higher power rating When using silicone tubes only use silicone tubes which have been sufficiently cured Vapours containing silicone can ad versely affect the functioning of electrical contacts In the case of low switching capacities such as 24 V 8 mA for example we recommend using an RC module 22 Q 1 pF in air con
16. g without socket 6 via 4 pin plug with socket 9 via 4 pin plug with socket IP 65 K2 Red green pilot LED for 24 V DC AC T Blue pilot lamp for 230 V AC T2 Red green pilot LED for 230 V AC N Blue pilot lamp for 120 V AC A External adjustment Adjusting range see page 23 Adjusting range switching DG Edition 08 13 16 5 Project planning information 5 1 Installation Installation in the vertical or horizontal position or sometimes upside down preferably with vertical diaphragm If installed in a vertical position the switching point ps will correspond to the scale value SK set on the hand wheel If installed in another position the switching point ps will change and no longer correspond to the scale value SK set on the hand wheel Switching point ps must be checked LB mr le pA All DG models except DO 1 Ps SK Ps SK 0 18 mbar ps SK 0 18 mbar DG 1 51 ps SK 0 4 mbar e g SK 1 2 Ag Ps SK ps 1 2 0 4 1 6 mbar RQ LE e g SK 1 2 ps 1 2 0 4 0 8 mbar DG 121 ps SK 0 5 mbar GC SS Ss sdb ps SK ps 5 0 5 5 5 mbar S e g SK 10 ps 10 0 5 9 5 mbar DG 181 DG 1201 DG 450 DG 18l ps SK 0 5 mbar 3 e g SK 10 Lx ps 10 0 5 9 5 mbar DG 1201 DG 4501 p
17. hragm in the screw connector is designed to ventilate the cover without allowing water to enter Order No 74923391 6 5 Restrictor orifice Rp or In the case of high pressure fluctuations we recommend using a restrictor orifice contains non ferrous metals Hole diameter 2 mm Order No 75456321 hole diameter 3 mm Order No 75441317 6 6 Test key PIA To test the min pressure switch the DG can be vented in its switched state using the PIA test key contains non ferrous metals Order No 74329466 DG Edition 08 13 k pA 6 7 Filter pad set To protect the electrical contacts in the DG from dirt particles in the surrounding air or in the medium use a filter pad at the 1 8 negative pressure port As standard on IP 65 units 5 piece filter pad set Order No 74916199 6 8 Tube set 4g TH OL e Se To be used with air only Order No 74912952 6 9 Standard socket set Order No 74915388 6 10 Standard coupler plug Vie Order No 74920412 20 6 11 Pilot lamp set red or blue K v Pilot lamp red 110 120 V AC 1 2 mA Order No 74920430 220 250 V AC 0 6 mA Order No 74920429 Pilot lamp blue 110 120 V AC 1 2 mA Order No 74916121 220 250 V AC 0 6 mA Order No 74916122 1 3 4 6 12 LED set red green K 24 V DC 16 mA 24 V AC 8 mA Order No 74921089 230 V AC
18. m EN ISO 13849 1 2008 9 10 Safe failure fraction SFF Fraction of safe failures related to all failures which are as sumed to appear from EN 13611 A2 2011 9 11 Probability of dangerous failure PFHp Value describing the likelihood of dangerous failure per hour of a component for high demand mode or continuous mode Unit 1 h from EN 13611 A2 2011 9 12 Mean time to dangerous failure MTTFg Expectation of the mean time to dangerous failure from EN ISO 13849 1 2008 9 13 Demand rate Nop Mean number of annual operations from EN ISO 13849 1 2008 9 14 Average probability of dangerous failure on demand PFDavg LDM 1 10 switching cycles year Average probability of a dangerous failure of the safety function on demand see EN 61508 6 DG Edition 08 13 ner 28 Feedback Finally we are offering you the opportunity to assess this Technical Information TI and to give us your opinion so that we can improve our documents further and suit them to your needs Clarity Found information quickly Searched for a long time Didn t find information What is missing No answer Use C To get to know the product 1 To choose a product C Planning CI To look for information Remarks www adobe com DG Edition 08 13 Comprehension Coherent Too complicated No answer Navigation I can find my way around got lost No answer ge Adobe Reader 7 or higher required
19. nctions Le krom schroder When installing outdoors place the DL in a roofed area and protect from direct sunlight even IP 65 version To avoid con densation the cover with pressure equalization element can be used see page I9 Pressure equalization element In case of highly fluctuating pressures install a restrictor orifice see page 20 Restrictor orifice DG Edition 08 13 6 Accessories 6 1 Fastening set with screws U shape bracket 50 1 97 30 1 18 L Quis gece QA IN T M ARSIS ES 9 ES i d og NM E of S FIN 24 0 94 EE 48 03 1 69 NE 64 2 52 For DG B DG U DG I Order No 74915387 6 2 Connecting set DG U DG H DG N DG ENDS For monitoring a minimum and maximum inlet pressure py with two pressure switches attached to one another Order No 74912250 DG Edition 08 13 ner 6 3 External adjustment Ge AUS De S In order to set the switching pressure from the outside the cover for external adjustment 6 mm Allen key for DG B DG U and DG I can be retrofitted Order No 74916155 2 CO 9 6 4 Pressure equalization element f To avoid the formation of condensation the cover with pres sure equalization element can be used The diap
20. nt 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 1i 3 6 DG in Zone 1 21 and 2 22 hazardous areas 12 3 7 DG on pipes with Zone 2 22 explosive atmospheres13 3 8 Animation 14 4 Selecliolt Lure desde Oe PLA RECTA Sd kok 15 4 1 Selection table 15 4 2 Type code 16 5 Project planning information 17 5 linstaldtiom z s 23 9 rs trier 17 GACCOSSOBSS crai re pU REY PR RE sent parte 19 6 1 Fastening set with screws U shape bracket 19 DG Edition 08 13 kpm roder 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 SER ceai genus ode neatrada ai ea 20 6 8 Tube set 20 6 9 Standard socket set
21. or electrical connection Negative pressure Air or flue gas Air or flue gas Gas air flue gas or biomethane Differential pressure Air or flue gas Air or flue gas Air or flue gas m Application PO er Electronic safety shut off valve SAV with closed position check of downstream devices Monitoring the negative pressure ensures the correct posi tioning of the components during fully automatic assembly Differential pressure switch for monitoring air filters of gas meters DG Edition 08 13 5 ner 1 1 6 Low pressure cut off and high gas pressure protection device 1 1 5 Air line with minimum pressure and flow monitoring VAS N VAS L KFM RFM The air flow generated by the fan may be monitored as follows The static pressure is monitored by pressure switch DG PZL as long as it can be demonstrated that the display consequently tthe pressure is either too low or too high the min max pres shows an adequate and secured flow of air or sure switch DG PZL PZH switches in order to avoid start up The pressure switch DG PDS controls the flow of air via the or to initiate a safety shut down differential pressure on the orifice If there is no air pressure supplied or if there is no differential pressure on the orifice the system will be blocked DG Edition 08 13 2 Certification SIL and PL certified For systems up to SIL 3 pursuant to EN 61508 and PL e pur suant to ISO 13849 E
22. related system is greater than one per year or greater than twice the proof test frequency from EN 61508 4 2008 9 3 Category Classification of the safety related parts of a control system in respect of their resistance to faults and their subsequent behaviour in the fault condition and which is achieved by the structural arrangement of the parts fault detection and or by their reliability from EN ISO 13849 1 2008 DG Edition 08 13 krom schroder 9 4 Common cause failure CCF Failures of different items resulting from a single event where these failures are not consequences of each other from EN ISO 13849 1 2008 9 5 Fraction of undetected common cause failures B Fraction of undetected failures of redundant components due to a single event whereby these failures are not based on mutual causes NOTE B is expressed as a fraction in the equations and as a percentage elsewhere from EN 61508 6 2010 9 6 Biog value Mean number of cycles until 10 of the components fail dan gerously from EN ISO 13849 1 2008 9 7 Tiod value Mean time until 10 of the components fail dangerously from EN ISO 13849 1 2008 9 8 Hardware fault tolerance HFT A hardware fault tolerance of N means that N 1 is the mini mum number of faults that could cause a loss of the safety function from IEC 61508 2 2010 27 Glossary 9 9 Mean dangerous failure rate Ap Mean rate of dangerous failures during operation time Tioga Unit 1 h fro
23. rsuant to 2002 95 EC Diaphragm pressure switch silicone free Diaphragm NBR for DG U B N H IIR for DG S Housing glass fibre reinforced PBT plastic with low gas release Lower housing section AlSi 12 Enclosure IP 54 or IP 65 Safety class 1 Line entrance M16 x 1 5 clamping range diameters of 4 to 10 mm DG T DG HT DG NT with 1 2 NPT conduit cable gland Type of connection screw terminals Weight 270 to 320 g 9 5 to 11 3 oz depending on equipment 22 7 1 Adjusting range switching hysteresis On all DG models except DG N the scale value is set to the switch on point and on DG N it is set to the switch off point Type DG 6T DG 6 DG 10 DG 30 DG 50 DG 150 DG 400 DG 500 DG 10H DG 10N DG 50H DG 50N DG 150H DG 150N DG 500H DG 500N Adjusting tolerance Type DG 1 5l DG 121 DG 18l DG 1201 DG 4501 Adjusting tolerance DG Edition 08 13 Adjusting range mbar WC 0 5 6 0 2 2 34 0 4 6 1 10 0 39 3 9 2 5 30 2 5 50 1 19 5 30 150 11 7 58 5 50 400 100 500 39 195 1 10 0 39 3 9 2 5 50 1 19 5 30 150 11 7 58 5 100 500 39 195 15 of the scale value Adjusting range mbar 1 5 to 0 5 and 0 5 to 3 12 to 1 and 1 to 7 2 to 18 10 to 120 80 to 450 15 of the scale value Mean switching differ ential at min and max setting mbar WC 0 2 0 3 0 08 0 12 0 2 0 3 0 25 0 4 0 1 0 16 0 35
24. s SK 0 2 mbar Le Ps SK The housing must not be in contact with masonry Minimum clearance 20 mm DG Edition 08 13 er The DG Sis suitable for oxygen and ammonia only diaphragm made of IIR Do not use for fuel gases diaphragm not resist ant In the case of oxygen ensure grease free installation Continuous operation at high temperatures e g maximum ambient temperature accelerates the ageing of elastomer materials and reduces the service life please contact manu facturer Ozone concentrations exceeding 200 ug m or gases containing more than 0 1 by vol H55 accelerate the ageing of elastomer materials and reduce the service life 2 Ports 3 and 4 are connected to the micro switch chamber The port that is best protected against soiling dust humidity is to be left open for ventilation positive pressure measurement to the atmosphere If dust exposure in the environment is high a filter pad see page 20 Restrictor orifice or a filter are to be used in the open port Combustion gas or a mixture of combustion gas and air must not be connected to port 3 or 4 Condensation must not be allowed to get into the housing if possible install pipework with an ascending gradient Otherwise there is a risk of icing of condensation at subzero temperatures the switching point shifting or corrosion in the device which can lead to malfu
25. s T6 Group Il The internal inductance capacitance is Lo 0 2 uH Co 8 pF The isolating amplifier transfers the DG s signals from the explosion hazard area to the safe area Depending on the de sign of the intrinsically safe circuit the explosion hazard area can be monitored for cable faults cable breaks or short circuits Ensure that standard compliant wiring pursuant to EN 60079 is used When operating in Zones 21 and 22 the 1 8 connecting thread or the tube connection for the surrounding air or medium con nection must be protected from dirt particles by a separate filter Intrinsically safe circuit without monitoring for cable faults Isolating amplifier Zone 1 or 2 Safe area DG Edition 08 13 ner Intrinsically safe circuit with monitoring for cable breaks Isolating amplifier Zone 1 or 2 Safe area Intrinsically safe circuit with monitoring for cable faults and short circuits Isolating amplifier LI NO N 10 kQ COM 400 2 lt R lt 2kQ Safe area Zone 1 or 2 k Function ner 3 7 DG on pipes with Zone 2 22 explosive atmospheres Pressure switch DG can be connected to pipes rooms in which Zone 2 22 explosive gases or dust are present without an isolating amplifier
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