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Milltronics OCM II PL-269, Инструкция по эксплуатации

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SECTION III

INSTALLATION

OCM II

The OCM II should be mounted in a clean dry area; within the operating temperature range and non-corrosive
to, the electronics and the NEMA 4 polycarbonate enclosure.  The enclosure door should be accessible to allow
calibrating and viewing.  Refer to Figure 1 for outline and mounting details.

Do not mount the OCM II in direct sunlight

without the use of a sun shield

BATTERY

After mounting the OCM II, open the cover and remove the front panel by loosening the captive thumb screws. 

The unit is supplied with one battery package.  Remove the battery from the package and insert it into either of
the two battery sockets.  The second battery socket is for installing a new battery before removing the old one,
so as not to loose calibration and data logged into the memory. 

Do not install the memory back-up battery until 

the OCM II is to be powered and put into use. 

A battery installed in a non-powered unit will be drained in about one year. Remove the battery during extended
shut down.

TRANSDUCER

Transducer wiring must be done in conjunction with approved conduit, boxes 

and fittings and to procedures in accordance with all governing regulations. 

All transducer wiring must be run in grounded metal conduit for optimum noise rejection. Ground shield only at
OCM II and insulate shield at junctions to prevent inadvertent grounding. 

Refer to Figures 3 & 8 in the back of this manual for wiring information and Figure 5 for general 
mounting practices. 

1.

Mount the transducer such that it is centered over the flow at a minimum height of 60 cm (2 ft) above the
highest liquid level with its radiating face aimed directly down.  "U" parameter drawings depicting transducer
location are for reference only.  Refer to the manufacturer of the primary measuring device for the specified
point of head measurement. 

2.

Position the transducer such that its sound path is  perpendicular to the liquid surface.  Noting that the
transducer beam angle is about 12° (6° off vertical or a rise:run of 10:1), care must be taken to position the
transducer such that the sound path to the liquid surface is unobstructed and does not intersect the walls of
the flume or weir. 

91/02/14

PL-269

3 – 1

Содержание OCM II PL-269

Страница 1: ...OCM II PROCESS MEASUREMENTS OPEN CHANNEL MONITOR Instruction Manual PL 269 February 1991 33452690 ...

Страница 2: ...k solids and motion sensing Milltronics is established world wide through associate offices and representatives Our network is continually being refined to provide our customers with first rate sales information engineering assistance and after sales support For more details on our products and service please contact us and we will provide you with a listing of the offices or representatives neare...

Страница 3: ...splay 4 4 Initial Start up 4 4 P4 and F12 Auto Zero 4 6 Setting the Clock 4 7 Setting the Calendar 4 7 V DAILY OPERATION Normal Operation F2 5 1 Flowrate Log F9 5 2 Daily Flow Total F10 5 2 VI AUXILIARY OPERATIONS F1 Emulation Mode 6 1 F3 Clearing Totalizers 6 1 F11 Clearing the Log Buffers 6 2 F13 Diagnostic routine 6 2 F14 Forced Cold Start 6 2 Re calibration 6 3 VII TABLES 1 D displays 7 1 2 F ...

Страница 4: ... 3 3 Velocity Area Product 9 4 Universal Head vs Flow Calculation 9 6 Re scaling Velocity Sensor Input 9 8 C SERIAL COMMUNICATIONS 9 9 D AUXILIARY PRINTER 9 12 E GLOSSARY 9 13 Calibration Flow Chart 9 15 F TROUBLESHOOTING 9 17 OCM II Test Report X FIGURES Listing 10 1 91 02 14 PL 269 ii ...

Страница 5: ...hotocopy for each device you have and circle the corresponding units or mode STEP THREE Refer to Table 4 listing the U parameters As there are many different types of flow applications it will greatly simplify matters for the user to select the one that fits his requirements and to disregard all others Establish the values or codes to be entered for the parameters required Write these onto the cal...

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Страница 7: ... specific to the application into the battery protected memory via the front panel keypad The OCM II derives the flowrate from the head measurement which is totalized and stored in a data log to provide a detailed flow analysis In some cases the use of a velocity sensor to determine the flow velocity may be required to perform a flow calculation The OCM II provides the excitation voltage required ...

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Страница 9: ...0 F Temperature transducer 40 to 93 C 40 to 200 F optional 115 V AC 125 VA thermostatically controlled heater available where electronics operating temperature may fall below 20 C 5 F Outputs transducer 600 V peak to peak pulses of 0 5 msec duration every 90 msec drive anolog 0 20 or 4 20mA DC isolated current output into 750 ohms maximum proportional to head flow or velocity relay one relay form ...

Страница 10: ...600 2400 1200 or 300 will output to a serial printer at regular intervals or on demand Temperature Sensor model TS 2 optional range 40 to 70 C 40 to 158 F construction PVC body totally encapsulated resistance 9 53 KΩ nominal at 20 C 68 F 5 KΩ temperature variance separation 183 m 600 ft from OCM II under specified conditions Refer to cabling approvals CSA FM and BASEEFA shipping weight 0 5 Kg 1lb ...

Страница 11: ...g life 1 year Duracell type DL 2025 Eveready Sanyo or GE type CR 2025 Ray O Vac or Panasonic CR 2016 Enclosure Nema 4 thermoplastic with hinged clear polycarbonate door Weight transducer 0 9 Kg 2 lb OCM II 6 8 Kg 15 lb temp sensor 0 45 Kg 1 lb PL 269 2 3 ...

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Страница 13: ...ng extended shut down TRANSDUCER Transducer wiring must be done in conjunction with approved conduit boxes and fittings and to procedures in accordance with all governing regulations All transducer wiring must be run in grounded metal conduit for optimum noise rejection Ground shield only at OCM II and insulate shield at junctions to prevent inadvertent grounding Refer to Figures 3 8 in the back o...

Страница 14: ...s Ensure the 9 53 Kohm load resistor across TB1 13 14 is removed prior to temperature sensor connection If the optional data transfer link to a computer is used the baud rate of the OCM II and computer must be the same This also applies to the serial printer if it is used Set switch SW1 as follows SW1 POSITION BAUD RATE toggle down at 1 9600 2 2400 3 1200 4 300 For Baud rates of 75 150 600 or 4800...

Страница 15: ...s designed to automatically prompt the user for each parameter in a particular sequence so that none will be missed Each parameter that is entered is then incremented to the next step required for the selected primary element In order to prevent unauthorized or accidental alteration of data all entries must be made through the access program mode F0 accessible via the following security code 2 718...

Страница 16: ...flow D5 Target range Important aid in trouble shooting Refer to Table 1 for listing E Enter Used to enter keypad selection as displayed and or to scroll forward through displays or parameters F Function Mode Enter F E Used to select any one of the F functions for performing special tasks e g F0 Access Programming F7 Setting the date Refer to Table 2 for listing P Parameters Enter P E Used to selec...

Страница 17: ...egative Sign KEYPAD ENTRY Press desired keypad switches e g P 2 Selection will be displayed in the Reading window Press E to enter selection Access parameters U P or display and function code entries D F are automatically shifted into the Mode window after entry However code selections and values remain displayed in the Reading window After entry is made mode is incremented to the next calibration...

Страница 18: ...ng window will display the factory setting EXAMPLE Enter F0 E Enter 2 71828 E The prompt in the left window will change to P0 and programming may proceed P0 0 Centimeters P0 1 Inches If centimeters is chosen Enter 0 E or simply E as the present value is 0 The next parameter P1 is now displayed P1 0 Temperature in degrees Celsius P1 1 Temperature in degrees Fahrenheit If temperature in Fahrenheit i...

Страница 19: ...te units per hour or units per day In this case hcal 38 cm so that Qcal 0 031273 m3 s b U1 time units of Qcal We have chosen to have our calibration in flow units per second so we must enter U1 0 c U2 hcal This is the head at which the calibration flowrate defined by U1 and U2 will occur In our case it is 38 cm d U3 The angle of the weir We will also need to enter the angle of the weir s V notch w...

Страница 20: ...ove the zero level to be given to calculate P4 Alternately the Auto Zero Routine F12 will make the required calculation and enter the appropriate value for P4 automatically Enter F12 E Enter current head F12 calculation will appear in the displays The current head is measured above the level at which flow would cease and must be in the units of measure selected by P0 When all the P and U parameter...

Страница 21: ...and press the enter key at the appropriate moment SETTING THE CALENDAR To set the calendar Enter F0 E if not yet in access mode 2 71828 access code E Enter F7 E Enter ddmmyy E The current date where d day m month y year e g July 11th 1981 110781 The clock continues to keep time during a power failure This insures that data entered upon power resumption is correctly referenced When the calibration ...

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Страница 23: ...l is programmable P9 in units corresponding to its assignment with a deadband set by P10 When the relay is designated as a totalizer or sampler contact it is normally de energized As a totalizer contact the relay is energized each time the displayed total increases by the amount entered into P9 As a sampler contact the relay is energized at the rate of the time period entered into P9 in units of m...

Страница 24: ...pond with the time 00 00 in the mode window and the corresponding average flowrate of the previous 15 minute interval will appear in the reading window Pressing E once will step to the next 15 minute interval or R to step backwards If either E or R is held the display will scroll rapidly through the logged data If there is no data recorded in the log for the requested date the reading will indicat...

Страница 25: ...second however the desired maximum flowrate is 700 litres second the operator may key in head values to find the head value required to produce the desired flowrate Enter F0 E if not yet in the access mode 2 71828 E P0 will appear Enter F1 E HEAD1 E FLOW corresponding to HEAD1 will be displayed Enter HEAD2 E FLOW corresponding to HEAD2 will be displayed etc F3 CLEARING TOTALIZERS Used to clear all...

Страница 26: ... will appear with the address being written into D23 ROM or D24 RAM to record failure location Enter F13 E F14 FORCED COLD START To force a cold start in order to completely reprogram the system NOTE This will erase all previous programming and data logs In the event of a surge in power supplied to the OCM II perhaps as the result of a nearby lightning strike it may be necessary to force a cold st...

Страница 27: ...ta logging is lost Enter F0 E 2 71828 E P0 will appear Enter desired P or U and E Revise parameter contents To reset or preset a display totalizer Enter F0 E 2 71828 E P0 will appear Enter desired D Reset display by entering clear 0 E Preset display by entering amount E PL 269 6 3 ...

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Страница 37: ...onics or your distributor P2 DESCRIPTION PAGE 0 Simple exponential device 7 13 1 Rectangular throated flume 7 15 1 Round nose horizontal crest weir 7 17 2 Trapezoidal throated flume 7 19 3 U throated flume 7 21 4 Rectangular profile weir 7 23 5 Rectangular notch weir 7 25 6 Triangular notch weir 7 27 7 Compound exponential devices 7 29 8 Velocity area product 7 31 9 Round pipe 7 33 10 Palmer Bowlu...

Страница 38: ...sducer location Typical Weir Installation V notch or Triangular U3 2 5 For rated flows under free flow conditions the head is measured upstream of the weir plate at a minimum distance of 3 times the maximum head i e where the liquid surface is not effected by drawdown The minimum allowable distance from transducer to maximum liquid level is 60 cm 2 ft PL 269 7 10 ...

Страница 39: ...6 upstream from the beginning of the converging section 0 head 2 3 C C transducer plan side Q For rated flows under free flow conditions the head is measured at 2 3 the length of the converging section upstream of the beginning of the throat section Position the transducer such that it is centered over the flow at a minimum height of 60 cm 2ft above the maximum head PL 269 7 11 ...

Страница 40: ...renced to the beginning of the converging section Refer to the following table Position the transducer such that it is centered over the flow at a minimum height of 60 cm 2ft above the maximum head Flume Size Point of Measurement pipe dia in inches mm inches 4 12 25 1 0 15 32 1 3 18 38 1 5 21 44 1 8 24 51 2 1 30 64 2 5 36 76 3 0 42 89 3 5 48 102 4 0 54 114 4 5 60 127 5 0 66 140 5 5 72 152 6 0 PL 2...

Страница 41: ...m specs U3 exponent enter 1 Sutro proportional weir 1 Head measurement only 1 5 Rectangular suppressed or Trapezoidal Cipolletti weir 1 5 Kahfagi venturi 1 55 Parshall flume 1 55 Leopold Lagco 2 5 Triangular V notch weir x or any exponent required Refer to manufacturers specifications for the exact exponent The exponents listed above are shown for reference only Free flowrate is given by Q Qcal x ...

Страница 42: ...RECTANGULAR THROATED FLUME L B 3 h to 4 h b h plan view elevation p flow transducer location min distance from transducer to max liquid level is 60 cm 2ft PL 269 7 14 ...

Страница 43: ...r value from specs U6 L Length of throat enter value from specs VALUES CALCULATED BY OCM II U7 m Side slope 0 for rectangular flume U8 Cv Velocity coefficient at current head U9 Cs Shape coefficient 1 for rectangular flume U10 Cd Discharge coefficient at current head U11 A Area of cross section of flow in approach channel U12 Cvcal Velocity coefficient at hcal U13 Cdcal Discharge coefficient at hc...

Страница 44: ...ROUND NOSE HORIZONTAL CREST WEIR transducer location min distance from transducer to max liquid level is 60 cm 2ft L p h b B 3 h to 4 h PL 269 7 16 ...

Страница 45: ...of weir crest above bed level enter value from specs U6 L Length of crest in direction of flow enter value from specs VALUES CALCULATED BY OCM II U7 m Side slope 0 for RNHC weir U8 Cv Velocity coefficient at current head U9 Cs Shape coefficient 1 for RNHC weir U10 Cd Discharge coefficient at current head U11 A Area of approach channel U12 Cvcal Velocity coefficient at hcal U13 Cdcal Discharge coef...

Страница 46: ...TRAPEZOIDAL THROATED FLUME transducer location min distance from transducer to max liquid level is 60 cm 2ft b 1 m B b B 3 h to 4 h L p transducer side slope plan view elevation p flow h PL 269 7 18 ...

Страница 47: ...smatic section of the contraction enter value from specs U7 m Side slope m horizontal 1 vertical enter value from specs VALUES CALCULATED BY OCM II U8 Cv Velocity coefficient at current head U9 Cd Discharge coefficient at current head U10 Cs Shape of coefficient at current head U11 A Area of cross section of flow in approach channel U12 Cvcal Velocity coefficient at hcal U13 Cdcal Discharge coeffi...

Страница 48: ...U THROATED FLUME transducer location min distance from transducer to max liquid level is 60 cm 2ft plan view L Da 3 h to 4 h h p elevation D PL 269 7 20 ...

Страница 49: ...nter value from specs U6 L Length of prismatic section of the contraction enter value from specs VALUES CALCULATED BY OCM II U7 m Side slope 0 for U throated flume U8 Cv Velocity coefficient at current head U9 Cd Discharge coefficient at current head U10 Cu Shape coefficient at current head U11 A Area of cross section of flow in approach channel U12 Cvcal Velocity coefficient at hcal U13 Cdcal Dis...

Страница 50: ...RECTANGULAR PROFILE WEIR transducer location min distance from transducer to max liquid level is 60 cm 2ft 3 h to 4 h L p h PL 269 7 22 ...

Страница 51: ...rom specs U3 p Height of weir above bottom of approach channel enter value from specs U4 L Width of the weir in the direction of flow enter value from specs VALUES CALCULATED BY OCM II U5 C Coefficient of discharge at current head U6 Cp Correction factor for C varies with h p U7 Ccal Coefficient of discharge at hcal U8 Cpcal Correction factor for C at hcal Flowrate is given by Q Qcal x C Ccal x Cp...

Страница 52: ...RECTANGULAR NOTCH WEIR transducer location min distance from transducer to max liquid level is 60 cm 2ft h p B b 4 h to 5 h PL 269 7 24 ...

Страница 53: ... specs U3 b Width of the notch enter value from specs U4 B Width of approach channel enter value from specs U5 p Height of the crest above the bottom of the approach channel enter value from specs VALUES CALCULATED BY OCM II U6 m Side slope 0 for rectangular weir U7 Ce Coefficient of discharge at current head U8 Cecal Coefficient of discharge at hcal Flowrate is given by Q Qcal x Ce Cecal x h kh h...

Страница 54: ...TRIANGULAR NOTCH WEIR h p B b transducer location min distance from transducer to max liquid level is 60 cm 2ft a 4 h to 5 h PL 269 7 26 ...

Страница 55: ...econd 1 per minute 2 per hour 3 per day U2 hcal The head at which Qcal occurs enter value from specs U3 alpha a Angle of V in degrees enter value from specs VALUES CALCULATED BY OCM II U4 Ce Coefficient of discharge at current head U5 Cecal Coefficient of discharge at hcal Flowrate is given by Q Qcal x Ce Cecal x h hcal 2 5 PL 269 7 27 ...

Страница 56: ...0 cm 2ft Q 3 33 L 0 2H H1 5 3 33LH1 5 0 666H2 5 where Q flow in cubic ft per second H head in ft L crest length in ft thus A 3 33L B 0 666 For rated flows under free flow conditions the head is measured upstream of the weir plate at a minimum distance of 3 times the maximum head i e where the liquid surface is not effected by drawdown L PL 269 7 28 ...

Страница 57: ...cal The head at which Qcal occurs enter value from specs U3 A Coefficient of the 1st exponential term enter value from specs U4 B Coefficient of the 2nd exponential term enter value from specs Flowrate is given by Q Qcal x A x h1 5 B x h2 5 A x hcal1 5 B x hcal2 5 Example for the thin plate rectangular notch weir where Q 3 33 L 0 2h h1 5 A L same units as in P0 B 0 2 PL 269 7 29 ...

Страница 58: ...FLOW BY VELOCITY AREA PRODUCT 1 transducer location min distance from transducer to max liquid level is 60 cm 2ft h Q area h b mh side slope b m PL 269 7 30 ...

Страница 59: ...ich Qcal occurs enter value from specs U3 vsensor Full scale reading of velocity sensor in the chosen linear units per second enter value from specs U4 vcal The maximum liquid velocity in the same units enter value from specs U5 b Width of the channel at its base enter value from specs U6 m Side slope m horizontal 1 vertical enter value from specs Flowrate is given by Q Qcal h b mh v hcal b mhcal ...

Страница 60: ...ROUND PIPE min 60 cm 2 ft h max transducer location refer to figure 7 r 45 7 cm 18 maximum standpipe length PL 269 7 32 ...

Страница 61: ...cal occurs enter value from specs U3 r Pipe inside radius enter value from specs min 6 inches VALUES CALCULATED BY OCM II U4 h Current head U5 f h A function of the current head U6 f hcal A function of hcal U6 f hcal A function of hcal U7 Q The current rate of flow Flowrate is given by Q Qcal f h f hcal pi h r h r r2 h r 2 5 r2 2 arcsin r 1 67 f h r pi 2arcsin h r 0 67 r PL 269 7 33 ...

Страница 62: ... diameter D 2 point of measurement 0 head Q For rated flows under free flow conditions the head is measured at a distance of D 2 upstream from the beginning of the converging section Position the transducer such that it is centered over the flow at a minimum height of 60 cm 2ft above the maximum head PL 269 7 34 ...

Страница 63: ...U1 tcal The time units of Qcal enter 0 per second 1 per minute 2 per hour 3 per day U2 hcal The head at which Qcal occurs enter value from specs U3 Qmax The max flow capability of the flume enter value from specs U4 hmax The head at which Qmax occurs enter value from specs PL 269 7 35 ...

Страница 64: ...tream from the flume entrance Refer to the following table Flume Size Point of Measurement D feet cm inches 0 5 4 7 1 88 0 75 6 7 2 69 1 0 9 1 3 63 1 5 13 5 5 38 2 0 17 9 7 19 2 5 22 5 9 00 3 0 27 2 10 88 4 5 40 5 16 19 Position the transducer such that it is centered over the flow at a minimum height of 60 cm 2ft above the maximum head PL 269 7 36 ...

Страница 65: ... The time units of Qcal enter 0 per second 1 per minute 2 per hour 3 per day U2 hcal The head at which Qcal occurs enter value from specs U3 Qmax The max flow capability of the H flume enter value from specs U4 hmax The head at which Qmax occurs enter value from specs PL 269 7 37 ...

Страница 66: ...U CHANNEL VELOCITY AREA PRODUCT V r h Center transducer over channel Minimum distance from transducer face to maximum head is 60 cm 2ft PL 269 7 38 ...

Страница 67: ...3 per day U2 hcal The head at which Qcal occurs enter value from specs U3 vsensor Full scale reading of velocity sensor in the chosen linear units per second at 5 volt input enter value from specs U4 vcal The maximum liquid velocity in the same units enter value from specs U5 r radius of channel bottom Flowrate is given by Q Qcal x area h area hcal x v vcal PL 269 7 39 ...

Страница 68: ...CITY AREA Center transducer over channel Minimum distance from transducer face to maximum head is 60 cm 2ft b V B V Channel h ht b 0 Trapezoidal Channel h ht b 0 Modified Trap h ht b 0 Rectangular Channel B 0 h ht PL 269 7 40 ...

Страница 69: ...ensor Full scale reading of velocity sensor in the chosen linear units per second at 5 volt input enter value from specs U4 vcal The maximum liquid velocity in the same units enter value from specs U5 b width of the bottom of the channel U6 B width of the top of the channel U7 ht height of transition to vertical section of the channel Flowrate is given by Q Qcal x area h area hcal x v vcal NOTE Th...

Страница 70: ...AREA FLOW CALCULATION Center transducer over channel Minimum distance from transducer face to maximum head is 60 cm 2ft V Cross Sectional Area Head A1 AN h A2 H1 A0 A5 A3 A4 H3 H4 H5 Hn H2 H0 Equal Increments PL 269 7 42 ...

Страница 71: ... U2 hcal The head at which Qcal occurs enter value from specs U3 vsensor Full scale reading of velocity sensor in the chosen linear units per second at 5 volt input enter value from specs U4 vcal The maximum liquid velocity in the same units enter value from specs U5 N the last A parameter number assigned AN enter N U6 hmax the highest head to be entered associated with parameter AN enter value fr...

Страница 72: ...HEAD vs FLOW CALCULATION Flowrate A1 AN A2 A4 A0 Center transducer over channel Minimum distance from transducer face to maximum head is 60 cm 2ft V h A5 A3 HN H5 H4 H3 H2 H1 H0 head Equal Increments PL 269 7 44 ...

Страница 73: ...lue from graph U1 tcal the time units of Qcal enter 0 per second 1 per minute 2 per hour 3 per day U2 hcal the head at which Qcal occurs enter value from graph U3 N the last A parameter number assigned AN enter N U4 hmax the highest head to be entered associated with parameter AN enter value from graph A0 flow at 0 head enter 0 as head is equal to 0 A1 flow 1 the flow at head increment 1 enter val...

Страница 74: ...ROUND PIPE VELOCITY AREA PRODUCT min 60 cm 2 ft h max transducer location refer to figure 7 45 7 cm 18 maximum standpipe length PL 269 7 46 ...

Страница 75: ...hour 3 per day U2 hcal The head at which Qcal occurs enter value from specs U3 vsensor Full scale reading of velocity sensor in the chosen linear units per second at 5 volt input enter value from specs U4 vcal The maximum liquid velocity in the same units enter value from specs U5 r radius of pipe Flowrate is given by Q Qcal x area h area hcal x v vcal PL 269 7 47 ...

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Страница 77: ... recommended at which time any build up of material on the transducer should be removed The enclosure and circuit board should be cleaned only when the power is disconnected at the main breaker and using a vacuum cleaner and a clean dry paint brush Check all electrical contacts for signs of corrosion or arcing The memory back up battery must be replaced every year to prevent memory loss in the eve...

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Страница 79: ...tempt to access non existent parameter 6 Access to parameters denied security code has not been entered 7 Primary element exceeds BS 3680 dimensions or head exceeds the max range of BS 3680 specifications bad U parameter 8 Conversion overflow long floating point to short floating point Inappropriate choice of flow or time units U0 or U1 causing logging total overflow Bad U parameter causing excess...

Страница 80: ...ail safe after 60 seconds without an echo P8 1 High alarm for high liquid head P9 13 6 Head at which alarm is to occur P10 3 Head must fall by 3 inches to cancel alarm P11 0 Analog output is to represent flowrate P12 20 Damping rate is 20 seconds for 100 change P13 0 Analog output is 4 20 mA P14 192 Optional logging file site identification number P15 1 Totalizer multiplier the floating point tota...

Страница 81: ...dth of throat in centimeters U4 40 Width of approach channel in centimeters U5 15 Hump height in centimeters zero if no hump U6 100 Length of throat P3 2 Display flow totalizer in run mode F2 P4 115 Distance from transducer to 0 flowrate head in cm P5 0 Calculate flowrate for all heads no low head cut off P6 1 Fail safe high P7 60 Fail safe after 60 seconds without an echo P8 6 Sampler relay conta...

Страница 82: ...us 6 84 square metres times 0 85 metres per second or 5 814 cubic metres per second This is the value to be entered as the calibration flowrate U0 and is the value for which the OCM II current output will be 20 mA if the current is to represent flowrate The maximum output from the velocity sensor 20 mA occurs when the velocity is 400 cm sec This is the sensor calibration velocity vsensor which mus...

Страница 83: ...ws every 1990 days at full scale P16 to P19 Not used in this example If AUTO ZERO calibration routine F12 is used entry of the current liquid head will cause P4 250 to be deduced and entered automatically N B Data Logging occurs automatically and requires no specific set up However the data logs will be meaningless if the CLOCK and CALENDAR are not set to the present time and date If data logs wil...

Страница 84: ...e head can be divided into a maximum of 30 increments Breakpoint Head cm Flowrate L S 0 0 0 0 00 1 2 5 1 47 2 5 0 4 12 3 7 5 7 94 4 10 0 12 24 5 12 5 18 24 6 15 0 23 35 7 17 5 30 00 8 20 0 36 47 9 22 5 43 83 10 25 0 51 18 You also want the totalization in cubic metres output 4 20mA all dimensions in cm and you do not want the output to change if there is a fault such as a cut transducer cable 91 0...

Страница 85: ... Relay to be used for totalizer contact closure P9 1000 Contact closure for every cubic metre 1000 L P10 0 Dead band not applicable P11 0 Analog output to be proportional to flow P12 90 Damping rate is 90 seconds for 100 change P13 0 Analog output 4 20 mA P14 0 Optional logging file identification number P15 1000 Totalizer display to be in cubic metres 1000L Totalizer overflows every 236 days at f...

Страница 86: ... counterclockwise 20 turns 4 Connect 0 to 10 volt DC source to the input terminals TB1 16 and TB1 17 5 Adjust the input voltage until it is equal to the proposed input SPAN ie 3 volts for a 7 10 volt velocity sensor input 6 Adjust the SPAN pot P2 until the voltage at IC33 pin 1 is exactly TWICE the voltage recorded in step 1 7 Now adjust the input voltage to be equal to the SPAN STEP 5 plus any OF...

Страница 87: ... start of text character STX which is represented by the hexadecimal number 02 and ends with an ASCII carriage return hexadecimal number 0d It should be noted that the dollar sign is commonly used to represent a hexadecimal or base 16 number as in the previous paragraph It is also used in some computer languages particularly BASIC to signify a character or a string of characters Thus there is a po...

Страница 88: ... preceded by STX and terminated by CR STX start of text 02 SITE 6 digits plus decimal e g 15 0000 CR carriage return 0d In BASIC one might receive the response with INPUT communications port RESPONSE and then strip off the first and last characters SITE MID RESPONSE 2 LEN RESPONSE 1 SUMMARY OF MESSAGE CODES Each must be preceded by STX 02 and suffixed with CR 0d SEND TO OCM II OCM II RESPONSE H re...

Страница 89: ...irst sending the message to set the single entry flow mode or if more than 96 requests are sent for entries on a single day then the OCM II will respond with ERROR 1 HARDWARE CONSIDERATIONS Communication baud rate may be selected from 300 1200 2400 or 9600 by appropriate setting of the baud rate DIP switch located on the main circuit board Baud rates of 75 150 600 and 4800 are also available by in...

Страница 90: ... as follows Date 18 05 89 Time 09 12 00 Site Number 1 000000 Head 24 86000 Velocity 12 26000 Temperature 17 10000 Flow Rate 2249 248 Flow Total 325468 9 Should there have been a power failure then the OCM II will output PRINTER READY 18 05 89 09 15 00 date and time power resumed Four seconds after power has returned The print output can be in English French German or Italian P16 1 2 3 or 4 respect...

Страница 91: ...eference level Maximum head head at maximum flow Nappe the jet of liquid leaving the weir crest OCM open channel metering Primary measuring device hydraulic structure of an open channel for measuring liquid flow E g weirs and flumes Ringing the inherent nature of the transducer to continue vibrating after the transmit pulse has ceased Ringing decays to acceptable levels in the order of millisecond...

Страница 92: ...PL 269 9 14 ...

Страница 93: ...lsafe P8 Relay Function 0 none 1 High head alarm 2 High flow alarm 3 Low head alarm 4 Low flow alarm 5 Time activated sampler contact min 6 Flow activated sampler contact engineering units P9 Relay Setpoint Desired relay activation value P10 Relay Deadband difference activate vs deactivate P11 Current Output Mode 0 Flowrate 1 Head 2 Velocity 3 Fixed Maximum 4 Fixed Minimum P12 Current Output Dampi...

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Страница 96: ...max for small 1 large size flumes M1 B 2 b B 2 B diameter of infeed pipe All percent errors to relate to full scale i e H max Q max and 20 mA Totalizer relay energization may have up to a 3 second delay before activating due to programming Therefore to determine the pulse rate a minimum time span of 3000 seconds must be used to reduce timing error to 0 1 300 seconds will give 1 resolution For tota...

Страница 97: ...nting OCM II Applications 10 6 6 Stilling Well Application 10 7 7 Applications with Standpipe 10 8 8 Wiring Formats Basic Wiring 10 9 Optional Velocity Sensor Isolated Analog Current Output 8A Wiring Formats 24 V DC Power Option 10 10 8B Wiring Formats Serial Communication 10 11 Auxiliary Device 9A B OCM II Motherboard Schematic 10 12 13 10 OCM Transceiver Display Schematic 10 14 PL 269 10 1 ...

Страница 98: ... 0 DISPLAYS FUNCTIONS ONITOR HANNEL PEN M C O D U C E F P A R 3 6 9 2 5 8 1 4 7 0 RELAY ACCESS READING MODE 375 mm 14 75 4 mtg holes 8mm 31 dia 305 mm 12 356 mm 14 clear polycarbonate door mtg holes 6 4 mm 0 25 262 mm 10 3 x 306 mm 12 1 194 mm 7 6 324 mm 12 8 OPEN STYLE NEMA 4 ENCLOSURE 145 mm 5 7 276 mm 10 9 254 mm 10 FIG 1 PL 269 10 2 ...

Страница 99: ... 1200 300 1 2 3 4 BAUD RATE RP5 9 3 R R 4 0 OC1 R R R 4 2 4 3 4 4 OC2 R 41 47 C 48 C IC34 IC 35 C49 RC2 1 2 3 4 5 6 15V 15V 6 2V NI 5 V 24V I COM R 51 52 R SPAN P5 53 R 54 R ZERO P6 555657 R R R D9 Q7 Q8 B E 2 6 R R 6 3 R 6 4 R 6 5 R 6 6 54 C C 55 56 C 57 C 7 6 R 6 ZD 36 IC IC 37 58 C 12 D 13 D 68 R LD1 Q9 25 26 27 28 29 30 RL 1 RELAY DRIVE 9 5 0 6 C RS 232 COM TXD RTS DCD CTS RXD TB 1 1 2 3 4 5 6...

Страница 100: ...eld only at OCM II Insulate shield at junctions to prevent inadvertent grounding Transducer wiring must be done in conjunction with approved conduit boxes and fittings and to procedures in accordance with all governing regulations ST 25 transducer 11 12 11 12 120 mm 4 7 1 NPT black white hot black white shield connection via customer s junction box OR direct connection radiating surface 84 mm 3 3 ...

Страница 101: ...ensor cable can be run with the transducer cable in a grounded metal conduit Ground shield only at OCM II Insulate shield at junctions to prevent inadvertent grounding 4 If a temperature sensor is used the 9 53KΩ resistor must be removed from across terminals TB 1 13 14 5 Temperature sensor wiring must be done in conjunction with approved conduit boxes and fittings and to procedures in accordance ...

Страница 102: ... Refer to Figure 7 Guidelines 1 Do not mount transducer directly to metal Use PVC coupling and nipple as provided 2 Do not overtighten mounting Hand tightening PVC coupling and nipple is sufficient 3 In OCM II applications transducer mount flange bracket conduit or plywood must keep transducer perpendicular to liquid surface 4 Transducer installation whether in non hazardous as shown or hazardous ...

Страница 103: ...TION stand pipe stilling well inlet temperature sensor transducer refer to Figure 7 60 cm 2ft minimum max head stand pipe inlet primary measuring device air vent FIG 6 blind flange transducer face stilling well PL 269 10 7 ...

Страница 104: ... the sound beam should not intersect the standpipe wall in applications opening into a larger area Otherwise additional blanking will be required to compensate for the interference zone created by the opening refer to section Appendices Troubleshooting sound beam intersects pipewall reflection at interference zone created by opening 6 blanking extension of 150mm 6 past end of standpipe may be requ...

Страница 105: ... B D L H S T O H C N Y S V 4 2 M O C 2 L G N D 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 to sensor 15 mA Avg 150 mA Surge if required Velocity sensor signal Optional Velocity Sensor additional to basic wiring L 1 TB1 DUCER TRANS RT SENSOR TEMP 115 115 230 SENSOR VELOCITY OUTPUT CURRENT RELAY D L H S D L H S D L H S T H W K L B D L H S T O H C N Y S V 4 2 M O C 2 L G N D 24 23 ...

Страница 106: ......

Страница 107: ...Appendix C Serial Communications Auxiliary Device addtional to basic wiring supports optional auxiliary Milltronics devices such as Satellite Dual Alarm Satellite Pump Module connect or disconnect auxiliary devices only when the OCM II power is OFF Ensure Clipside of the cable is mated to the clipside of the connector DATA LINK to serial port of external device Serial Communication additional to b...

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