Milltronics OCM II PL-269 Instruction Manual
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Milltronics OCM II PL-269 Instruction Manual

Milltronics OCM II PL-269 Instruction Manual

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OCM II
OPEN CHANNEL MONITOR
Instruction Manual
PL-269
February 1991
PROCESS MEASUREMENTS
33452690

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Summary of Contents for Milltronics OCM II PL-269

  • Page 1 OCM II OPEN CHANNEL MONITOR Instruction Manual PL-269 February 1991 PROCESS MEASUREMENTS 33452690...
  • Page 2 We are committed to satisfying our customers’ needs with innovative equipment that is designed for reliability and ease of use. Milltronics has been designing and manufacturing process equipment since 1954. Our fields of expertise include ultrasonic and capacitance level measurement in-line weighing of dry bulk solids and motion sensing.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION TITLE PAGE USERS GUIDE TO MANUAL GENERAL INFORMATION 1 - 1 SPECIFICATIONS 2 - 1 INSTALLATION OCM II 3 - 1 Battery 3 - 1 Transducer 3 - 1 Temperature Sensor 3 - 2 Velocity Sensor 3 - 2 Interconnection 3 - 2...
  • Page 4 APPENDICES ERROR CODES 9 - 1 EXAMPLES #1 Parshall Flume 9 - 2 #2 Rectangular Flume 9 - 3 #3 Velocity-Area Product 9 - 4 Universal Head vs Flow Calculation 9 - 6 Re-scaling Velocity Sensor Input 9 - 8 SERIAL COMMUNICATIONS 9 - 9 AUXILIARY PRINTER...

  • Page 5: Users Guide To Manual

    Now that all the data required to perform the calibration has been copied onto the calibration flow chart, follow the flow chart and enter your parameter values in order as prompted by the OCM II. Should you require assistance in determining your application type, contact Milltronics or your distributor. PL-269...

  • Page 7: Battery 3

    SECTION I GENERAL INFORMATION The Milltronics OCM II Open Channel Metering system is comprised of a NEMA 4 enclosed, microprocessor based electronic package, ultrasonic transducer and solid state temperature sensor. The OCM II system employs the principle of echo ranging to determine level. The OCM II transducer emits a precisely defined burst of ultrasonic energy.

  • Page 9: Specifications

    SECTION II SPECIFICATIONS - 115/230 V ±10%, 25 VA, 50/60 Hz Power - standard - 100/200 V ±10%, 25 VA, 50/60 Hz - special - +24 V DC ± 10%, 25 VA - optional Fuse - 1/4 amp MDL Slo-Blo or equivalent Range - 0.6 to 3.0 M (2 to 10 ft) Transducer...
  • Page 10 The relay is certified for use in equipment where the short circuit capacity capability of the circuits in which they are connected is limited by fuses having ratings not exceeding the rating of the relays. Temperature - one temperature sensor input Compensation - error: - without temperature sensor: 0.17%/ °C...
  • Page 11 Battery - RAM back-up - 3 volt lithium, PC mount - operating 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)

  • Page 13: Installation

    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.

  • Page 14: Temperature Sensor

    TEMPERATURE SENSOR Refer to figures 4 & 8 for mounting and wiring. VELOCITY SENSOR (optional/not by Milltronics) Connect the velocity sensor output to terminals 16,17 & 18 of TB-1 on the OCM II motherboard. For virtually any cross sectional channel shape, a velocity sensor can be used in combination with the level from the transducer to calculate the flowrate.

  • Page 15: Start Up

    SECTION IV START UP GENERAL Calibration of the OCM II is done via the front panel keypad. To provide clarity, all keypad entries are enclosed within square brackets [ ] to distinguish them from other text. The OCM II is designed to automatically prompt the user for each parameter in a particular sequence so that none will be missed.

  • Page 16: Keypad

    KEYPAD "A" Auxiliary Functions Used to select auxiliary parameters for Universal Head vs Flow Calculation applications and perform printer functions. "C" Clear Used to clear reading display "D" Display quantities Enter [D#] [E] Used to select any one of the ‘D’ displays These are specific results of normal operation which the user may wish to view.

  • Page 17: Keypad Entry

    "R" Recall Used to scroll backward through displays or parameters. "U" Unit Parameters Enter: [U#] [E] Used to select any one of the ‘U’ unit parameters. These parameters set the physical characteristics unique to the primary element being monitored. They have been separated from the other parameters in order that the OCM II may prompt the user for each entry during calibration.

  • Page 18: Initial Start Up

    INITIAL START UP The memory back-up battery must be installed before turning the power switch on. (refer to INSTALLATION section) Flip SW-2 power switch ON. The OCM will display "F0" in the mode window and the transducer will begin firing. The unit is now ready to be calibrated.
  • Page 19 Example 1 BS-3680 triangular weir, when P2=6 is entered, the OCM II will switch to the list of unit parameters required for that type of flow calculation. If the prompting sequence is followed, none of the unit parameters will be inadvertently omitted.

  • Page 20: P4 And F12 Auto Zero

    Example 2 Parshall Flume Max. flow = 936 X 10 litres per day Max. head = 40 centimeters 1.55 Flowrate = K (Head) where K is a constant 1 Count = 1000 litres Referring to Table 4 for "U" parameters, enter [0] [E] or simply [E] Primary element [936] [E] Max.

  • Page 21: Setting The Clock

    SETTING THE CLOCK To set the clock: Enter: [F0] [E] (if not yet in access mode) [2.71828] (access code) [E] Enter: [F5] [E] Enter: [hhmmss] [E] The current time in 24 hour format where h = hours m = minutes s = zero seconds e.g.

  • Page 23: Daily Operation

    SECTION V DAILY OPERATION When the OCM II system has been placed in normal running operation, F2, all of its operating parameters are preserved in the battery protected memory. In the event of a power failure the system will be brought back up in normal F2 mode of operation with logs and totalizers saved with the data prior to this power failure.
  • Page 24 In addition to the aforementioned totalizers, a serial port totalizer (D22) is provided. It is incremented at the same rate as D2, but may be viewed or reset by serial communication (refer to Appendix C). The data logging buffers are configured as ring buffers, capable of storing 45 days of flow information. Following 45 days, further data logs will be stored commencing from the day 1 location again.

  • Page 25: Auxiliary Operations

    SECTION VI AUXILIARY OPERATIONS EMULATION MODE The flow calculation parameters can be checked for accuracy by using the emulation function, F1. A liquid head is entered via the keypad and the OCM II will respond by displaying the flow associated with that head.

  • Page 26: F11 Clearing The Log Buffers

    CLEARING THE LOG BUFFERS Used to clear the log buffers. This will zero displays: F9, flowrate log and F10, daily flow totals log. Enter: [F0] [E] (if not yet in access mode) [2.71828] [E] "P0" will appear Enter: [F11] [E] [2.71828] [E] "clr"...

  • Page 27: Recalibration

    RECALIBRATION To revise a few parameters so that no others are altered or no data 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"...
  • Page 37 The following is a list of the types of primary elements for which the OCM II has been programmed. Refer to the page covering your particular application; the rest may be disregarded. For applications other than those listed, please contact Milltronics or your distributor. DESCRIPTION...
  • Page 38 TYPICAL SHARP-CRESTED WEIRS transducer location minimum Typical Weir Installation Rectanglar - suppressed V - notch or Triangular U3 = 1.5 U3 = 2.5 Trapezoidal (Cipolletti) Sutro (Proportional) U3 = 1.5 U3 = 1 (symmetrical or asymmetrical) 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.

  • Page 39: Parshall Flume

    KHAFAGI VENTURI converging diverging throat plan 15 cm (6") transducer * head side front For rated flows under free flow conditions, the head is measured 15 cm (6") upstream from the beginning of the converging section. TYPICAL PARSHALL FLUME plan transducer * 0 head side...

  • Page 40: Table

    TYPICAL LEOPOLD LAGCO throat plan diverging converging transducer transducer point of measurement head side front For rated flows under free flow conditions, the head is measured at a point upstream referenced to the beginning of the converging section. Refer to the following table. Flume Size Point of Measurement (pipe dia.

  • Page 41: Simple Exponential Device

    P2=0 SIMPLE EXPONENTIAL DEVICES U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter:...

  • Page 42: Rectangular Flume

    RECTANGULAR THROATED FLUME transducer location [min.distance from transducer to max. liquid level is 60 cm (2ft)] flow 3 h to 4 h plan view elevation PL-269 7 – 14...
  • Page 43 P2=1 BS-3680 RECTANGULAR THROATED FLUME U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter:...

  • Page 44: Round-Nose Horizontal Crest Weir

    ROUND NOSE HORIZONTAL CREST WEIR transducer location [min.distance from transducer to max. liquid level is 60 cm (2ft)] 3 h to 4 h PL-269 7 – 16...
  • Page 45 P2=1 BS-3680 ROUND-NOSE HORIZONTAL CREST WEIR U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Qcal enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Qcal occurs enter: [value from specs.]...

  • Page 46: Trapezoidal Throated Flume

    TRAPEZOIDAL THROATED FLUME side slope transducer location [min.distance from transducer to max. liquid level is 60 cm (2ft)] flow plan view 3 h to 4 h transducer elevation PL-269 7 – 18...
  • Page 47 P2=2 BS-3680 TRAPEZOIDAL THROATED FLUME U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter:...

  • Page 48: Throated Flume

    U-THROATED FLUME transducer location [min.distance from transducer to max. liquid level is 60 cm (2ft)] plan view 3 h to 4 h elevation PL-269 7 – 20...
  • Page 49 P2=3 BS-3680 U-THROATED FLUME U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter:...

  • Page 50: Rectangular-Profile Weir

    RECTANGULAR PROFILE WEIR transducer location [min.distance from transducer to max. liquid level is 60 cm (2ft)] 3 h to 4 h PL-269 7 – 22...
  • Page 51 P2= 4 BS-3680 RECTANGULAR-PROFILE WEIR U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter:...

  • Page 52: Rectangular-Notch Weir

    RECTANGULAR NOTCH WEIR transducer location [min.distance from transducer to max. liquid level is 60 cm (2ft)] 4 h to 5 h PL-269 7 – 24...
  • Page 53 P2=5 BS-3680 RECTANGULAR-NOTCH WEIR U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter:...

  • Page 54: Triangular-Notch Weir

    TRIANGULAR-NOTCH WEIR transducer location [min. distance from transducer to max. liquid level is 60 cm (2ft)] a° 4 h to 5 h PL-269 7 – 26...
  • Page 55 P2=6 BS-3680 TRIANGULAR-NOTCH WEIR U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter:...
  • Page 56 SHARP CRESTED RECTANGULAR CONTRACTED WEIR transducer location [min. allowable distance from transducer to maximum liquid level is 60 cm (2ft) ] minimum 3 H Q = 3.33(L-0.2H) H = 3.33LH - 0.666H where: Q = flow in cubic ft per second H = head in ft L = crest length in ft thus:...

  • Page 57: Compound Exponential Devices

    P2=7 COMPOUND EXPONENTIAL DEVICES U0 = Q The flowrate at full head enter: [values from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter:...
  • Page 58 FLOW BY VELOCITY - AREA PRODUCT transducer location [min. distance from transducer to max. liquid level is 60 cm (2ft) ] side slope area = h(b+mh) PL-269 7 – 30...

  • Page 59: Velocity-Area Product

    P2=8 VELOCITY-AREA PRODUCT U0 = Q The flowrate at full head and max. liquid velocity enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs...

  • Page 60: Round Pipe

    ROUND PIPE transducer location (refer to figure 7) 45.7 cm (18 ") maximum standpipe length min. 60 cm (2 ft) PL-269 7 – 32...
  • Page 61 P2=9 ROUND PIPE U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter: [value from specs.]...
  • Page 62 TYPICAL PALMER-BOWLUS FLUME (as manufactured by Plasti-Fab or Warminster Fiberglass) point of measurement transducer head D = pipe or sewer diameter 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.
  • Page 63 P2=10 PALMER BOWLUS FLUME U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter:...
  • Page 64 TYPICAL H-FLUME transducer point of measurement plan side front For rated flows under free flow conditions, the head is measured at a point downstream from the flume entrance. Refer to the following table. Flume Size Point of Measurement D (feet) inches 1.88 0.75...

  • Page 65: Flume

    P2=11 H-FLUME U0 = Q The flowrate at full head enter: [value from specs.] U1 = t The time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs enter: [value from specs.]...

  • Page 66: Channel, Velocity-Area Product

    U-CHANNEL VELOCITY AREA PRODUCT Center transducer over channel. Minimum distance from transducer face to maximum head is 60 cm (2ft) PL-269 7 – 38...
  • Page 67 P2 = 12 U CHANNEL, VELOCITY-AREA PRODUCT U0 = Q The flowrate at full head enter: [value from specs.] U1 = t the time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs...

  • Page 68: Trapezoidal Bottom Channel, Velocity-Area

    TRAPEZOIDAL BOTTOM VELOCITY AREA Center transducer over channel. Minimum distance from transducer face to maximum head is 60 cm (2ft) h ≤ ht, b=0 V - Channel h ≤ ht, b ≠ 0 Trapezoidal Channel h > ht, b ≠ 0 Modified - Trap Rectangular Channel B = 0...
  • Page 69 P2 = 13 TRAPEZOIDAL BOTTOM CHANNEL, VELOCITY-AREA PRODUCT U0 = Q The flowrate at full head at velocity v enter: [value from specs.] U1 = t the time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q...
  • Page 70 UNIVERSAL VELOCITY - AREA FLOW CALCULATION Center transducer over channel. Minimum distance from transducer face to maximum head is 60 cm (2ft) Head Cross Sectional Area PL-269 7 – 42...
  • Page 71 P2 = 14 UNIVERSAL VELOCITY-AREA FLOW CALCULATION From the Head vs Cross Sectional Area graph for the primary element, divide the head axis of the graph into equal increments. Sequentially assign each increment an "A" parameter number starting from "A0" at 0 head to a maximum of "A31".

  • Page 72: Universal Head Vs Flow Calculation

    UNIVERSAL HEAD vs. FLOW CALCULATION Center transducer over channel. Minimum distance from transducer face to maximum head is 60 cm (2ft) head Flowrate PL-269 7 – 44...
  • Page 73 P2 = 15 UNIVERSAL HEAD vs. FLOW CALCULATION From the Head vs Flowrate graph for the primary element, divide the head axis of the graph into equal increments. Sequentially assign each increment an "A" parameter number starting from "A0" at 0 head to a maximum of "A31".

  • Page 74: Round Pipe, Velocity-Area Product

    ROUND PIPE, VELOCITY - AREA PRODUCT transducer location (refer to figure 7) 45.7 cm (18 ") maximum standpipe length min. 60 cm (2 ft) PL-269 7 – 46...
  • Page 75 P2 = 30 ROUND PIPE, VELOCITY-AREA PRODUCT U0 = Q The flowrate at full head enter: [value from specs.] U1 = t the time units of Q enter: [0] per second [1] per minute [2] per hour [3] per day U2 = h The head at which Q occurs...
  • Page 77 SECTION VIII MAINTENANCE The OCM II requires very little maintenance due to its solid-state circuitry. However, a program of periodic preventative maintenance should be initiated. This should include regular inspection, general cleaning, transducer face inspection, overall system performance checks and standard good housekeeping practices. A periodic inspection of the transducer is recommended, at which time any build-up of material on the transducer should be removed.

  • Page 79: Error Codes

    APPENDIX A ERROR CODES Numeric underflow: probably a bad U parameter or incorrect flow program P2. Numeric overflow: probably a bad U parameter or incorrect flow program P2. P9 to small, relay is pulsing once every 2 seconds until the totalizer is overflowed at high flowrates. Attempt to divide by zero: check parameter entries.
  • Page 80 APPENDIX B EXAMPLE 1: PARSHALL FLUME This example considers a 6 inch Parshall flume which has a maximum flowrate of 1.87 MGPD at 1.24 feet of head. The transducer has been mounted 30 inches above the maximum operating head (at least 24 inches required). The maximum liquid head is 1.24 feet = 14.88 inches.

  • Page 81: Rectangular Flume 9

    EXAMPLE 2: RECTANGULAR FLUME (BS-3680) This example considers flow in a rectangular flume with a raised invert (hump), calculated according to the British Standards Institute specification, BS-3680. The transducer is mounted 65 cm (minimum 61 cm) above the highest liquid level. The flume has a capacity if 0.11964 cubic meters per second at full head which is 50 cm.

  • Page 82: Velocity-Area Product 9

    EXAMPLE 3: VELOCITY-AREA PRODUCT This example considers a trapezoidal irrigation channel in which flow is to be calculated by the product of the cross section of flow with the average flow velocity. The velocity sensor provides 4- 20 mA output with 20 mA representing a velocity of 400 cm/sec.
  • Page 83 P11 = 2 Analog output represents velocity (20 mA = 400 cm/sec) P12 = 20 Damping rate is 20 seconds for 100% change. P13 = 0 Analog output is 4-20 mA P14 = 5 Optional logging-file site identification number P15 = 1000 Totalizer multiplier 1 unit = 1000 cubic metres Totalizer overflows every 1990 days at full scale P16 to P19...
  • Page 84 EXAMPLE 4: UNIVERSAL HEAD vs. FLOW CALCULATION This example considers a type QV 306 Flume having a head-flowrate relationship as indicated by the graph below. You wish to have 50 L/S as full scale. Since 25 cm will give 51.18 L/S we will use this as a start point. We then divide the head measurements into 11breakpoints of 10 equal increments and extract the flow readings as listed in the chart.
  • Page 85 Enter the parameters as follows: P0 = 0 Dimensions are in cm P1 = 0 Temperature is Celsius P2 = 15 Unlisted Channel Head-Flowrate relationship U0 = 50.00 Design flow to produce 20 mA output U1 = 0 Flowrate time units (per sec) U2 = 24.5 Head at design flow (U0) U3 = 10...

  • Page 86: Re-Scaling Velocity Sensor Input

    RE-SCALING VELOCITY SENSOR INPUT The OCM II velocity sensor input can be re-scaled to accept input signals other than 1-5 volts. Its range of adjustment allows re-scaling of any input signal with voltages ranging between 0 and 10 V, but of a minimum span of 2.5 volts.

  • Page 87: Serial Communications

    OCM II‘s data log. It also provides access to the primary information gathered by the OCM II. The user may establish his own system of data logging using his own computer, printer and disk storage system or utilize the software available from Milltronics and detailed in another instruction book. The auxiliary printer feature is detailed in Appendix D.
  • Page 88 In some cases the message must also contain a date. When this is the case it is placed immediately after the message type identifier. It must be four digits long and in the form ddmm. For example 2301 would specify the 23 rd of January.

  • Page 89: Error Messages

    prompts for the next flowrate log entry (see above) test message simply returns the test message * NOTE : Any message longer than 68 characters will be ignored by the OCM II. ERROR MESSAGES The OCM II will return an error message in place of the requested data for any of four reasons: If the message sent to the OCM II is incorrect, the OCM II will respond with ‘ERROR 1’.

  • Page 90: Auxiliary Printer

    APPENDIX D AUXILIARY PRINTER The OCM II can be connected to a serial printer via the RS232 terminals and programmed to print at regular intervals. The choices are every minute or whole minute that will divide into 60 evenly, or every hour or whole hour that will divide into 24 evenly, or once a day (P17 &...

  • Page 91: Glossary

    APPENDIX E GLOSSARY Aeration: air gap between nappe and weir. Beam angle: angle diametrically subtended by the one half power limits (-3dB) of the transducer‘s acoustic output. Blanking: zone extending downward from the transducer face in which the received echoes are ignored.
  • Page 92 PL-269 9 – 14...

  • Page 93: Calibration Flow Chart

    CALIBRATION FLOW CHART [2.71828] Access Program Mode Dimension Units (0 = cm., 1 = in.) Temperature Units (0 = °C, 1 = °F) Primary Measuring Device, (Selected from Table 3) If P2 ≠ 0 If P2 = 0 Enter required parameters selected from Table 4 Max.
  • Page 96 F0= ACCESS CODE F6= SHOW DATE DO= HEAD F2= RUN MODE *F7= SET DATE D1= FLOW F4= SHOW TIME F9[E]+DDMM[E]= 15 min flow averages D3= TEMPERATURE *F5= SET TIME F10[E]+DDMM[E]= Daily flow total D5= DISTANCE FROM FACE TO SURFACE *F12[E]+CURRENT HEAD IN INCHES[E]= AUTO ZERO *ACCESS CODE F0 MUST BE ENTERED FIRST Angle a Hmax...

  • Page 97: Figures

    SECTION X FIGURES LISTING Figure OCM II Outline Detail and Mounting 10 - 2 OCM II Layout 10 - 3 ST - 25 Transducer Outline & Wiring 10 - 4 Temperature Sensor Outline & Wiring 10 - 5 Transducer Mounting - OCM II Applications 10 - 6 Stilling Well Application 10 - 7...
  • Page 98 OCM II OUTLINE DETAIL AND MOUNTING 4 mtg. holes NEMA 4 ENCLOSURE 8mm (.31") dia. ACCESS RELAY MODE READING 375 mm (14.75") 356 mm DISPLAYS & FUNCTIONS HANNEL (14") ONITOR 254 mm clear 194 mm (10") polycarbonate (7.6") door 305 mm (12") mtg holes 6.4 mm (0.25") OPEN STYLE...
  • Page 99 OCM II LAYOUT RANGE COMPUTER ADD. RP1 C6 COUNTER DATA & CONTROL RP1A SYNC ECHO BLANK BLANK TUNING ZERO C42 CR3 BAUD 9600 RATE 2400 1200 R31 C 40 ZERO 2 BAUD ANALOG SPAN 1 INPUT SPAN P5 53 P6 555657 I COM 5 6 7 SPAN...
  • Page 100 - Cable length: - standard: - 1m (3’) - optional: - consult Milltronics - Radiating surface: - polyurethane - Cable must be run in a grounded metal conduit with no other cabling (except temp. sensor cable). Ground shield only at OCM II. Insulate shield at junctions to prevent inadvertent grounding.
  • Page 101 TEMPERATURE SENSOR OUTLINE & WIRING OCM II * 13 14 15 SHLD cable SHLD SHLD connection via customer’s junction box 1" NPT 59 mm (2.31") 41 mm (1.63") NOTES: 1. The temperature sensor should be mounted in a location which represents the temperature fluctuations likely to occur between the transducer and the target.
  • Page 102 TRANSDUCER MOUNTING - OCM II APPLICATIONS Bracket Flexible Conduit flexible conduit steel channel * 1" NPT PVC coupling ST-25 transducer Flexible conduit mounted transducer should not be subjected to wind, vibration or jarring. Plywood Blind Flange * 1" NPT PVC nipple * 1"...
  • Page 103 STILLING WELL APPLICATION blind flange air vent transducer face temperature sensor transducer 60 cm (2ft) (refer to Figure 7) minimum stand pipe max. head primary measuring device stilling well stand pipe inlet stilling well inlet FIG. 6 PL-269 10 – 7...
  • Page 104 APPLICATIONS WITH STANDPIPE In some OCM II applications, access to the channel must be made via a standpipe. In such cases, the transducer may be hung from a blind flange that will mate to the flanged standpipe. The stand pipe length should be as short and the diameter as large as possible. As a rule of thumb, the -3 dB cone of the sound beam should not intersect the standpipe wall in applications opening into a larger area.
  • Page 105 WIRING FORMATS TRANS- TEMP. DUCER. SENSOR RELAY VELOCITY CURRENT SENSOR OUTPUT D + - D + - voltage select jumper(s) refer to refer to power FIG. 3 FIG.4 Basic Wiring TRANS- TEMP. DUCER. SENSOR RELAY VELOCITY CURRENT SENSOR OUTPUT Velocity sensor to sensor 15 mA Avg.
  • Page 107 Serial Communication (additional to basic wiring) supports optional auxiliary connect or disconnect auxiliary Milltronics devices such as: devices only when the OCM II power is OFF. Ensure "Clipside" Satellite Dual Alarm, of the cable is mated to the...

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