Manuale d’uso / di manutenzione del prodotto 7ML19985AB01 del fabbricante Siemens
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Instruction Manual Nov ember 2005 OCM III open channel.
© Siemens Milltronics Process In struments Inc. 2005 Safety Guidelines: Warning notices must be observed to ensure p ersonal safety as well as that of others, and to protec t the product and the connected equipment. These war ning notices are accompanied by a clarification of the level of cautio n to be observed.
TABLE OF CONTENTS TITL E PAGE A B OUT THIS .. . About T his M a nua l 7 About the O C M - 3 7 SPECIFICA TIONS 9 P rogra mme r 1 0 Tr an s d u c er 11 Tem p er at u r e Sen s o r 11 Cab l i n g 11 C om.
STA R T UP Gener a l 21 K ey p ad 21 Le ge nd 2 2 I nitia l S ta rt U p 2 2 F unda me nta l C he cks 2 5 OPERA T ION Mem or y 27 Sec u r i ty 27 Un i ts 27 F low C a lcula tion 2 8 Di s p lay 28 Dam p.
‘ D’ PA RA METER LISTING 39 ‘F ’ P AR AM E T E R LI S T I N G 4 1 ‘ P’ PA RA METER L ISTING 43 ‘ U’ PA RA METERS FOR P3 PRIMA RY ELEMENT 51 S imple E xpone ntia l D e vice s, P 3 = 0 5.
7ML 19985A B 01 OCM III 6.
ABOUT THIS ... ABOUT THIS MANUAL Although the O C M - 3 is very ‘a pproa cha ble ’ due its dia logue ca pa bilitie s a nd intuitive ope ra tion, the use r should be fa milia r with this ma nua l. T his ma nua l provide s the use r with the ne ce ssa ry informa tion re quire d to insta ll, sta rt up a nd ope ra te the O C M - 3 .
Th e OCM-3 c o n v ert s t h e h ead m eas u r em en t i n t o f l o w r ate, b u t al s o p r o v i des a ve locity se nsor input f or a pplica tions whe re a flow ve locity me a sure me nt is re quire d to pe rf orm the flow ca lcula tion.
SPECIFICATIONS P owe r: » dc supply: » 9 to 3 0 V D C , 8 W ma x and / or » a c supply: » 100/ 115/200/230 V ac ± 15%, 50/ 60 Hz, 20 VA m ax E nvironme n ta l: » loca tion » indoor / outdoor ».
» i s o l ati o n: 300 V ac c on t i nuous » r elay s : » 3 al ar m /c on t r o l r el ay s » 1 form ’C ’ S P D T conta ct pe r re la y, ra te d a t 5 A at 250 V ac non- inductive or 3 0 V dc .
B att er y : » 9 V (A NSI / NEDA 1604, PP3 o r eq u i v alen t ) o r 3 V lithium b a tte ry TRANSDUCER Mo d el : » XRS-5* Ref er t o as s o c i ated Tr an s d u c er m anu al . TEMPERATURE SENSOR M ode l: » T S - 2 , LT S - 1 or LT S - 1 C Ref er t o as s o c i ated Tem p er atu r e Sen s o r m anu al .
Auxilia ry I nput: » Be lde n 8760 or eq u iv al en t 24 V Ou t p u t : » B eld en 8760 COMMUNICATION SOFTWARE M illtronics U tilitie s S of twa re on st a nda rd P C floppy disk f or D O S 3 .
INSTALLATION Insta lla tion s hal l only be perfor med by qu ali fied perso nnel and in accor dance with local g overning regu lations. INSTALLING THE OCM-3 T he O C M - 3 should be mounte d in a cle a n, dry a re a tha t is: within the a mbie nt te mpe ra t ure ra nge a nd suita ble for the spe cifie d e nclosure .
OCM-3 LAYOUT boa rd A boa rd B displa y boa rd Hazardous volt age present on tr ansduc er t ermi nals duri ng opera ti on. dc ter minal s shal l be suppl ied f rom SELV source i n accor dance wit h I EC 101 0- 1 Anne x H.
SYSTEM DIAGRAM 98/03/05 OCM- 3 M i ll tronics t ra nsdu ce r, s ee S p eci fic ati o ns M il lt ronics T S - 2 , t em p er at u re s en s o r customer de vi ce c u s to m er alar m , pump or cont r ol.
INSTALLING THE TRANSDUCER INSTALLING THE TEMPERATURE SENSOR Max c ab l e r u n 183 m (600 f t ) o f R G - 6 2 U or e quiva le nt . C a ble must be run in a grounde d me ta l conduit with no othe r ca bling (e xce pt T e mp. S e nsor ca ble ) . G round shie ld a t O C M - 3 only.
mA OUTPUT RELAYS All re la ys a re ce rtifie d for use in e quipme nt whe re the short circuit ca pa city of the circuits in which the y a re conne cte d is li mite d by fuse s ha ving ra tings not e xce e ding the ra ting of the re la ys. i s o lat ed 0 o r 4 t o 20 m A o u tp ut (P26) i nt o 1 K Ω l oa d ma ximu m.
SYNCHRONIZATION W he re two to a ma ximum of twe lve tra nsduce rs will be sha ring a common conduit the O C M - 3 s should be synchroniz e d. I n orde r to synchroniz e O C M - 3 s: » re move jumpe r J1 on boa rd A on a ll but one O C M - 3 » inte rconne ct the S Y N C te rmina l ( T B1 - 2 0 ) of a ll O C M - 3 s.
POWER CONNECTIONS T h e O C M - 3 powe r supply a cce pts 100, 115, 200 or 230 V ac p er s w i t c h SW1 ( boa rd B) se le ction a nd 9 to 3 0 V dc. T he O C M - 3 ope ra te s e ithe r unde r a c or dc powe r, or both a c a nd dc live simulta ne ously.
INSTALLING THE MEMORY BACK-UP BATTERY T he me mory ba tte ry, B1 ( se e S pe cifica tions) should be re pla ce d ye a rly to insure me mory ba ck up during le ngthy powe r outa ge s. An on boa rd ca pa citor provide s one hour of me mory re te ntion in orde r to pre se rve the me mory while the ba tte ry is be ing cha nge d.
START UP GENERAL F or t he initia l sta rt up, it is a dvisa ble to use the progra m me r for progra mming the OCM-3. Th e p r og r am m er t r an s m i t s a c od ed i n f r ar ed s i gn al eac h t i m e a k ey i s p r es s ed .
LEGEND P re ss the a ssocia te d progra mme r ke y: D ispla y shown on O C M - 3 : P rogra mme r ke y: INITIAL START UP Afte r insta lla tion proce dure s ha ve be e n comple te d, the O C M - 3 ma y be powe re d up.
fa ctory se t se curity code 2.71828 m u s t b e en ter ed if the wrong la ngua ge wa s se le cte d, it ma y be cha nge d he re continue progra m ming by e nte ring the de sire d options a nd a dva ncing until the s c r ol l r et ur n s t o ‘ P0’ .
I f da ta logging is de sire d, the time a nd da t e must be se t. e. g . 1141 11: 41 a.m . , se conds a re a lwa ys a ssume d to be 0 0 tim e is di spla ye d i n hh:mm:ss e. g . 12101492 Oc t o ber 12, 1492 Th e s t ar t u p p ro c edu r e i s n o w c om p l et e.
FUNDAMENTAL CHECKS Fo r ac c u r ate d eter m in at i o n o f f l o w r at e, ac c u r at e h ead m eas u r em en t i s es s en t i al . C he ck the following a nd corre ct if ne ce ssa ry. » c hec k D5 f o r c o r r ec t tem p erat u r e at tr an s du c er l o c at io n .
7ML 19985A B 01 OCM III 26.
OPERATION U pon powe r up, t he t ra nsduce r is fire d pe riodica lly a s se t by P 3 6 . A long inte rva l be t we e n me a sure me nt s ma y be de sira ble in orde r to conse rve powe r* whe n ope ra ting the O C M - 3 from a D C source of limite d ca pa city.
FLOW CALCULATI ON Absolute vs. ra tiome tric T he O C M - 3 ca n be progra mme d to use e ithe r of two me thods ( P 4 ) for ca lcula ting flow f r o m t h e h ead m eas u r em ent : ab s o l u te o r r at i o m et r i c. Th e r es ul t i s t h e s am e re ga rdle ss of the me thod use d.
Flow R ate Field Totali zer Field Relay / No Echo Field Status Field T he O C M - 3 provide s illumina tion for the LC D for e a sie r vie wing of the displa y.
RELAYS Th r ee o n b o ar d m u l ti p ur p o s e r el ay s ar e p r o v i d ed b y t he O CM-3. P15, 18 an d 21 s et the re spe ctive functions for re la ys 1 , 2 a nd 3 .
T he mA functi on ca n be ove rridde n for te st purpose s by se tting the de sire d mA va lue i n t o F3. Wh en t h e v alu e i s en t er ed , t h e m A o u t p u t w i l l g o t o t h at v al u e. Wh en F 3 i s e xite d, t he mA output will re ve rt to norma l ope ra t ion.
U nde r low flow conditions, a cut- off he a d ( P 4 5 ) ca n be e nt e re d to a void tota liz ing flows occurring a t or be low the flow corre sponding to the cut- off he a d. LOGGING T he O C M - 3 provide s a n e xte nsive logging fe a ture which ca n be vie we d on the loca l displa y or re t rie ve d via the se ria l comm unica tion link.
V ie wing the da ta log Th e d ay t o t al i zer (F14) d o es n o t us e t h e m as t er t o t al i zer m u l t i p l i er (P32). It i s p o s si b l e tha t the da ily tota l ove rflows.
BLANKING Bla nking is use d to ignore the z one in front of the tra nsduce r whe re ringing or othe r f al se ec h o i s at a l ev el th at i n t er f er es w i t h t h e p r o c es s i n g o f th e t r u e ec h o . Th e minimum bla nking is fa ctory se t , but ca n be ove rridde n by e n te ring the de sire d d i s t anc e i n to P47.
T he da ily tota l will be incre a se d proportiona l to the a m ount of time the da y wa s le ngthe ne d. Adjustin g the Date I f the ca le nda r is re se t, t he O C M - 3 will a djust the log da te s a ccordingly, t a king into a ccount le a p ye a rs a nd da ys pe r m onth.
FLOW VELOCITY INPUT I n some a pplica tions, the flow ca lcula ti o n fo r t h e c h o s en p r i m ar y el em en t r eq u i r es a ve locity input. I n this type of a pplica tion, the tra nsduce r me a sure me nt is use d to c alc u l ate t h e c r o s s s ec t i o n al ar ea o f t h e f l o w .
Th e 0% an d 100% l im i t s o f t h e au x i li ar y i nput must be sca le d using pa ra me te rs P 4 3 an d P44. » se le ct P 4 3 » e nte r the volta ge corre sponding to z e ro he a d » se le ct P 4 4 » e nte r the he a d corre sponding to 5 V .
‘D’ PARAMETER LISTING R e fe r to ‘Ope ra tion’ for de ta ils. D0 h ead D1 f lo w r ate D 2 short to ta l * D 3 ma ximum flow ra te D 4 min imum fl ow ra te D5 t emp er at u r e D 6 ma ximum t.
7ML 19985A B 01 OCM III 40.
‘F’ PARAMETER LISTING R e fe r to ‘Ope ra tion’ for de ta ils. F 0 e nte r se curity code F 1 e mula tion mode * F 2 run mode F 3 ke ypa d to m A output * F 4 show time se t ti me * F 5 show d.
7ML 19985A B 01 OCM III 42.
‘P’ PARAMETER LISTING R e fe r to ‘Ope ra tion’ for de ta ils. P 0 la ngua ge 0 = en gl i s h 1 = f r en c h 2 = i t ali an 3 = g er man 4 = s pan i s h P 1 dime nsiona l units l i n ear v elo.
1 3 = R e cta ngula r Are a x Vel oc i t y 14 = Tr apezo i dal A rea x Velo c i ty 15 = Mo d i fi ed Tr ap ezo i d al A r ea x Vel oc i t y 16 = U-c han n el A r ea x Velo c i ty 17 = Ci r c ul ar A r.
P 1 3 displa y da mping 0 = o ff 1 = l o w 2 = m ed 3 = high P 1 4 displa y lighting 0 = o n 1 = au t o o f f 2 = o ff P15 / P18 / P21 r el ay 1 / 2 / 3 as s ig n m en t 0 = not in se rvice 1 = de - e.
24 = en er gi ze o n l o w A u x . v ol t s 2 5 = de - e ne rgiz e on high Aux. volts 2 6 = e ne rgiz e on high Aux. volts 2 7 = de - e ne rgiz e up control on he a d 2 8 = e ne rgiz e up control on h.
P 2 7 mA da mping (se cs) P 2 8 mA options ( e m ula t or tra cking) 0 = don’t tra ck e mula tor 1 = t r ac k emu l at o r P29 f ail -s afe t i m e (s ec s ) P30 f ail -s afe an al o g m o d e 0 = h.
P 3 4 printe r mode 0 = ne ve r print 1 = i n t erv al t o b e i n m in u t es 2 = inte rva l to be in hours 3 = print once e a ch da y P 3 5 printe r timing P36 m easu r em en t i n ter v al 0 = 1 s .
P 3 9 da ta logging ra te fix e d 0 = 1 m i n 3 = 30 1 = 5 4 = 60 2 = 15 5 = 24 h r va ri a ble ( condition ) 6 = 15/1 m i n ( % flow / mi n ) 19 = 60 / 1 ( flow ) 7 = 15 / 5 " 20 = 60 / 5 ".
P42 h ead d et er m i n at i o n 0 = b y OC M-3 1 = by a uxilia ry de vice P43 v o l t s i n f o r zer o h ead P44 h ead at 5 v o l t s i n P45 l o w f l ow c ut -o f f h ead P46 r an g e at zer o h e.
‘U’ PARAMETERS FOR P3 PRIMARY ELEMENT T he numbe r of ‘U ’ pa ra me t e rs re quire d va rie s a ccording t o the prima ry e le me nt chose n ( P 3 ) a nd the me thod of ca lcula tion ( P 4 ) . T he O C M - 3 prompts the use r by displa ying the ne xt re quire d pa ra me te r, insuring the progra mming is comple te .
17 Ci r c u l ar A r ea x V e locity 18 Gu l l Wi n g A r ea x V e locity 19 Eg g -s h ap ed A r ea x V e locity 20 Un i v er s al A r ea x V e locity Th e p r im ar y el em en t m u s t b e i n s t al l ed i n ac c o r d an c e w i t h t h e man u f act u r er s re com me nda tions a nd in a ccorda nce with a ll gove rning re gula tions.
SIMP LE EXPONEN TIAL DE VICES, P3 = 0 ‘U’ parameters required * U0 = expo nent U1 = k factor (P4 = 0 on ly) T ypica l E xpone ntia l D e vice s: » S utro ( proport iona l) we ir » h ead m eas u .
SIMP LE EXPONEN TIAL DE VICES, P3 = 0 TYPICAL SHARP-CRESTED WEIRS Typical Weir P rofiles F or ra te d flows unde r fre e f low conditions, the he a d is me a sure d upstre a m of the we ir p l at e at a mi n im u m d i s t an c e o f 3 ti m es t h e m ax i m u m h ead (i .
SIMP LE EXPONEN TIAL DE VICES, P3 = 0 KHAFAGI VENTURI F or ra te d flows unde r fre e flow conditions, the he a d is me a sure d 1 5 cm ( 6 ") upst re a m from the be ginning of the conve rging se ction. * Th e t r an s d u c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v alu e, P47.
SIMP LE EXPONEN TIAL DE VICES, P3 = 0 TYPICAL PARSHALL FLUME F or ra te d flows unde r fre e flow conditions, the he a d is me a sure d a t 2 / 3 the le ngth of the conve rging se ction upstre a m of the be ginning of the throa t se ct ion.
SIMP LE EXPONEN TIAL DE VICES, P3 = 0 TYPICAL LEOPOLD LAGCO F or ra te d flows unde r fre e f low conditions, the he a d is me a sure d a t a point upstre a m re f e re nce d to the be ginning of the conve rging se ction. R e fe r to the following t a ble .
BS-3680 Rectangular Flume, P3 = 1 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = a pproach wi dth B U4 = Cv U1 = th roat width b U5 = Cd U2 = h ump height p U6 = A U3 = th roat length L * obta in from ma nufa cture r’s spe cifica tions.
BS-3680 RECTANGULAR F LUME 3 t o 4 x h ma x L t r an sd u cer * h 0 h ead p * Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v al u e, P47.
BS-3680 Round Nose Horizontal Crest Weir, P3 = 2 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = cres t width b U3 = Cv U1 = cre st he ight p U4 = Cd U2 = c rest length L U5 = A * obta in from ma nufa cture r’s spe cifica tions. ** ca lcula te d by OC M - 3 .
BS-3680 ROUND NOS E HORIZONTAL CREST WEIR t r an sd u cer * 3 t o 4 x h ma x * Th e t r an s d u c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v alu e, P47.
BS-3680 TRAPEZOIDAL FLUME, P3 = 3 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = a pproach wi dth B U5 = Cv U1 = thro at wid th b U6 = Cd U2 = h ump height p U7 = Cs U3 = th roat length L U8 = A U4 = slop e m * obta in from ma nufa cture r’s spe cifica tions.
BS-3680 TRAPEZO I DAL FLUME p side t r an sd u cer * pla n L en d p h B 3 t o 4 x h ma x b * Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v al u e, P47.
BS-3680 U-Flume, P3 = 4 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = a pproach diameter Da U4 = Cv U1 = thro at di amete r D U5 = Cd U2 = h ump height p U6 = Cu U3 = th roat length L U7 = A * obta in from ma nufa cture r’s spe cifica tions.
BS-3680 U-FLUME L p h D 3 t o 4 x h ma x Da t r an sd u cer * 0 h ead * Th e t r an s d u c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v alu e, P47.
BS-3680 FINITE CREST WEIR, P 3 = 5 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = cre st widt h b U3 = C U1 = cre st he ight p U4 = Cp U2 = c rest length L * obta in from ma nufa cture r’s spe cifica tions. ** ca lcula te d by OC M - 3 .
BS-3680 FINITE CREST WEIR t r an sd u cer * 3 t o 4 x h ma x * Th e t r an s d u c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v alu e, P47.
BS-3680 THIN PLATE RECTANGULAR WEIR, P3 = 6 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = a pproach wi dth B U3 = Ce U1 = cre st widt h b U4 = K b U2 = cre st he ight p * obta in from ma nufa cture r’s spe cifica tions. ** ca lcula te d by OC M - 3 .
BS-3680 THIN PLATE RECTANGULAR WEIR 4 t o 5 x h ma x t r an sd u cer * * Th e t r an s d u c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v alu e, P47.
BS-3680 THIN PLATE V-NOTCH WE IR, P3 = 7 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = n otch angl e alpha U1 = Ce * obta in from ma nufa cture r’s spe cifica tions. ** ca lcula te d by OC M - 3 . M a y be vie we d by a cce ssing ‘U ’ pa ra me te r.
BS-3680 THIN PLAT E V-NOTCH WEIR t r an sd u cer * 4 t o 5 x h ma x * Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v al u e, P47.
RECTANGULAR WEIR (CONTRACT E D), P3 = 8 ‘U’ parameters required * U0 = cr est width b * obta in from ma nufa cture r’s spe cifica tions. ** ca lcula te d by OC M - 3 .
RECTANGULAR WEIR - CONTRACTED t r an sd u cer * 4 t o 5 x h ma x * Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v al u e, P47.
ROUND PIPE, P3 = 9 ( ba se d on the M a nning F ormula ) ‘U’ parameters required * U0 = pipe insid e diam ete r D U1 = s lope (fall/ru n) s U2 = roughn ess coeffi cient n * obta in from ma nufa cture r’s spe cifica tions.
ROUND PIPE h t r an sd u cer * ** * T his dime nsion should be a t le a st 1 5 cm ( 6 " ) shorte r t ha n t h e b l an k in g v alu e, P47. ** Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i ng v al u e, P47.
PALM ER-BOWLUS FLUME *, P3 = 10 ‘U’ parameters required ** U0 = maxi mum flu me width , h max * typica lly those ma nufa cture d by W a rminste r or P l a sti- F a b.
PALMER-BOWLUS FLUM E D = pipe or se we r dia me te r 0 h ead D / 2 , point of me a sure me nt * t ran sd u cer ** * f or ra te d f lows unde r fre e flow conditions ** Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i ng v al u e, P47.
H-FLUME *, P3 = 11 ‘U’ parameters required * U0 = maxi mum li sted he ad, h max * a s de ve lope d by the U . S . D e pa rtme nt of Agri culture , S oil C onse rva tion S e rvice .
H-FLUME front point of me a sure me nt side t r an sd u cer * pla n Fl u me Si ze Po i n t o f Measu r emen t D ( fe e t) cm inche s 0.5 4.7 1.88 0.75 6.
UNIVERSAL HEAD vs FLOW, P3 = 12 Th e f l ow c u r v e i s c h ar ac ter i zed b y en t er i n g t h e h ead (A eve n ) a nd flow ( A odd ) ordina te s for the numbe r of da ta points ( n, 4 to 1 6 ) ove r the flow ra nge .
UNIVERSAL HEAD vs FLOW e . g. typica l compound we ir P a ra me te rs U 0 = 11 A 0 = 0 h ead , p o i nt 1 A 12 = 1. 05 h ead , p o i nt 7 A1 = 0 flow, point 1 A1 3 = 2 . 6 5 f low, point 7 A 2 = 0. 3 head , p o i n t 2 A 14 = 1.2 h ead , po i nt 8 A3 = 0 .
RECTANGULAR AREA X VELOCITY, P3 = 13 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = chan nel wid th B U1 = are a (h) * obta in from ma nufa cture r’s spe cifica tions. ** ca lcula te d by OC M - 3 . M a y be vie we d by a cce ssing ‘U ’ pa ra me te r.
RECTANGULAR AREA X VELOCI TY t r an sd u cer * * Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v al u e, P47.
TRAPEZOIDAL AREA X VELOCITY , P3 = 14 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = chan nel top width B U3 = area (h) U1 = chan nel ba se width b U2 = chan nel de pth ht * obta in from ma nufa cture r’s spe cifica tions. ** ca lcula te d by OC M - 3 .
TRAPEZOIDAL AREA X VEL OCITY t r an sd u cer * * Th e t r an s d u c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v alu e, P47.
MODIFIED TRAPEZOIDAL AREA X VELOCITY, P3 = 15 ‘U’ parameters listed * ‘U’ parameters calculated ** U0 = chan nel top width B U3 = area (h) U1 = chan nel ba se width b U2 = tr ansit ion he ight ht * obta in from ma nufa cture r’s spe cifica tions.
MODIFIED TRAPEZOIDAL AREA X VELOCITY t r an sd u cer * * Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v al u e, P47.
U-CHANNEL AREA X VELOCITY, P3 = 16 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = base diame ter D U1 = are a (h) * obta in from ma nufa cture r’s spe cifica tions. ** ca lcula te d by OC M - 3 . M a y be vie we d by a cce ssing ‘U ’ pa ra me te r.
U-CHANNEL AREA x VELOCI TY t r an sd u cer * * Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v al u e, P47.
CIRCULAR AREA X VELOCITY, P3 = 17 ‘U’ parameters listed * ‘U’ parameters calculated ** U0 = cond uit diame ter ID U1 = are a (h) * obta in from ma nufa cture r’s spe cifica tions. ** ca lcula te d by OC M - 3 . M a y be vie we d by a cce ssing ‘U ’ pa ra me te r.
CIRCULAR AREA X VELOCITY h t r an sd uc er * ** * T his dime nsion should be a t le a st 1 5 cm ( 6 " ) shorte r t ha n t h e b l an k in g v alu e, P47. ** Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i ng v al u e, P47.
GULL-WING AREA X VELOCITY, P3 = 18 ‘U’ parameters required * ‘U’ parameters calculated ** U0 = chan nel ba se width b U4 = are a (h) U1 = lower angle alph a ( α) U2 = uppe r ang le beta ( β) U3 = tr ansit ion he ight ht * obta in from ma nufa cture r’s spe cifica tions.
GULL WING AREA X VELOCITY t r an sd u cer * V * Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i n g v al u e, P47.
EGG-SHAPED AREA X VELOCITY, P3 = 19 ‘U’ parameters listed * ‘U’ parameters calculated ** U0 = top radius R U3 = are a (h) U1 = bot tom radius r U2 = axia l disp lace ment d * obta in from ma nufa cture r’s spe cifica tions. ** ca lcula te d by OC M - 3 .
EGG-SHAPED AREA X VELOCITY t r an sd u cer * sta ndpipe * * * T his dime nsion should be a t le a st 1 5 cm ( 6 " ) shorte r t ha n t h e b l an k in g v alu e, P47. ** Th e t r an s du c er m u s t b e ab o v e t h e m ax i m u m h ead b y at l eas t t h e b l an k i ng v al u e, P47.
UNIVERSAL AREA X VELOCITY, P3 = 20 A r b it r ary ar ea i s t y p i c all y u s ed w h en t he p r i mar y el em en t an d /o r i t s f lo w d o n o t f i t an y o f t h e p r im ar y el em en t s c o v ered b y P3. Th er e i s n o u s er d i f f er en c e b et w een ab s ol u te a nd ra tiome t ric ca lcula tions P4 .
UNIVERSAL AREA X VELOCITY U0 = 8 A0 = 0 he a d, point 1 A 1 = 0. 0 area, p o i n t 1 A 2 = 0. 05 h ead , po i n t 2 A 3 = 0. 03 ar ea, po i n t 2 A 4 = 0. 1 head , p o i n t 3 A 5 = 0. 06 ar ea, po i n t 3 A 6 = 0. 15 h ead , po i n t 4 A 7 = 0. 09 ar ea, po i n t 4 A 8 = 0.
7ML 19985A B 01 OCM III 98.
MAINTENANCE T h e O C M - 3 re quire s ve ry l ittle ma inte na nce due to its sol id- st a te circuitry. H owe ve r, a progra m of pe riodic pre ve nta t ive ma inte na nc e should be initia te d.
ERROR CODES Error Code Listing 1 numbe r unde rflow 2 numbe r ove rflow 3 d i v id e er r o r 4 b ad ar g u m en t 5 inva lid pa ra me te r 6 syste m is locke d 7 h ead ex c eed s B S-3680 s pec 8 mus.
COMMUNICATIONS T he O C M - 3 provide s se ria l communica tion e i the r through M illtronics proprie ta ry bipola r curre nt loop or indust ry sta nda rd R S - 232. Co m m u n i c at i o n c a n b e u s ed t o provide a vide o or pa pe r printout of O C M a ctivity.
M illtronics provide s a sta nda rd U tilitie s softwa re pa cka ge , for conve nie nt communica tion be twe e n a n I BM P C compa tible compute r a nd t he O C M - 3 . I n a ddition, the use r ma y opt to de ve lop his own custom softwa re progra m to pe rform ta sks suite d to his spe cific ne e ds.
Interconnect ion Bipolar Current RS-232 I BM P C C ompute r C onne ction re fe r to C V C C instruction ma nua l for conne ction to compute r compute r se ria l port D B- 9 conne ctor compute r se ria.
Timed Prin t Out T he O C M - 3 ca n be progra mme d to pe riodica lly print out O C M da ta ( P 3 4 / 3 5 ) . A typica l print out will have the following forma t.
Milltronics Utilities Software Disk T he M illtronics U tilitie s S oftwa re e xpa nds t he hum a n inte rfa ce ca pa bilitie s of the OCM-3 as c om p ar ed t o th at p r o v i d ed b y t h e s i m p l e u s e of t h e i n f r a-r ed p r o g r am m er .
T he O C M - 3 U tilitie s softwa re provide d by M illtronics use s X O N / X O F F to e nsure communica tion re lia bility. T he softwa re is writte n to be e xe cute d on a n I BM P C compa tible comput e r. Th e s tan d ar d k ey bo ar d em u l at es t h e OCM-3 p r o g r am m er .
Custom Pr ogramming and Third Party Co mmunication Prog ram Us ers w h o w i s h t o w r i t e t hei r o w n s o f t w ar e to c o m m un i c at e w i t h th e OCM-3 ar e u r g ed to imple me nt a fully buffe re d ( inte rrupt drive n) se ria l link incorpora ting X O N / X O F F .
T he following is a list of comma nds for the se conda ry pa rse r: C omma nd R e sponse /a#/ t he c o n t en t o f a#, w h er e: a = A , D * , F, P an d U # = 0 through 9 e.
/ j/ re turns a code indica ti ng the re la y sta tus code re la y 123 0000 1100 2010 3110 4001 5101 6011 7111 /l / s t ar t d at a l o g d o w n l o ad .
Modem Communicat ion C ommunica tion with the O C M - 3 ove r a n a nswe r ba ck te le phone mode m is re la tive ly stra ight forwa rd. F or mode m communica tion ove r conve ntiona l te le phone line s, a m ax i mu m of 1200 o r 2400 b au d i s r ec o m m en d ed .
Considerations - s et t h e ’ c o l d s tar t ’ (F12) d ef au l t b aud t o 1200 b y r em o v in g j u m p er J 1 o n b o ar d A . - s et b o t h m o d em s an d t h e OCM-3 b au d r at es to 1200. - se t the re mote mode m to ope ra te in the ’a nswe r ba ck’ mode .
Endi ng Co mmunic ati on - t y pe W to bre a k O C M - 3 communica tion with the mode m * . Th e c o mp u t er s c reen will display a fla shing me ssa ge ‘O C M - 3 mute d’. - t y pe: +++ ( not displa ye d on the scre e n) a nd the n pre ss E N T E R T his will ca use both mode ms to switch t o the ‘comma nd’ mode .
*7ml19985AB01* Rev . 1.0 www .siemens.com/processautomation Siemens Milltronics Process Instruments Inc. 1 954 T ec hnology Drive, P .O. Box 4225 Peterborough, ON, Canada K9J 7B1 T el: (705) 7 45-2431 Fax: (705) 7 41-0466 Email: techpubs.smpi@siemens.
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