Milltronics CVCC Manuel d'instructions Page 36
- Page / 112
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
FLOW VELOCITY INPUT
In some applications, the flow calculation for the chosen primary element requires a
velocity input. In this type of application, the transducer measurement is used to
calculate the cross sectional area of the flow. By multiplying the area with the distance
per time units of velocity, the volume per time units of flow are calculated. The
calculated velocity can be viewed via D8.
The 0% and 100% limits of the velocity input must be scaled using parameters
P8 and P9.
» select P8
» enter the voltage corresponding to zero velocity
» select P9
» enter the velocity corresponding to 5 V
e.g. If the velocity sensor output is 1 V per m/sec and the output is
scaled for 7 V at 100% velocity (7 m/sec), then enter 5 m/sec. If the
output is scaled for 4 V at 100% velocity (4 m/sec), enter 5 m/sec.
P8 and P9 can only be accessed if P3 has been set for an option that requires the use
of a velocity input. The input voltage level can be viewed via D12.
AUXILIARY HEAD INPUT
In some applications, the transducer input (TB1-1/2) is not used to provide a signal for
head measurement. A typical example of this is an application which is beyond the 3
m (10 ft) range of the OCM-3. In such a case, the head could be derived from another
Milltronics level monitor or other compatible device.
The method of head determination is set by P42. The OCM-3 simply substitutes the
signal from the auxiliary device for the ultrasonic measurement provided by the
transducer. The programming and consequent flow calculation are performed
as normal.
typical 1 - 5 V signal from
velocity sensor.
typical 4 - 20 mA signal from velocity sensor.
Add terminating resistor.
e.g. 250 Ω for 1 - 5 V over 4 - 20 mA.
Current Input
Velocity Input
(additional to Basic Wiring)
Signal must be positive with respect to ground.
Voltage Input
7ML19985AB01 OCM III 36
- Measurement 2
- Continuous 2
- Weighing Systems 2
- TABLE OF CONTENTS 3
- 7ML19985AB01 OCM III 6 6
- ABOUT THIS 7
- SPECIFICATIONS 9
- PROGRAMMER 10
- TRANSDUCER 11
- TEMPERATURE SENSOR 11
- COMMUNICATION SOFTWARE 12
- INSTALLATION 13
- OCM-3 LAYOUT 14
- SYSTEM DIAGRAM 15
- INSTALLING THE TRANSDUCER 16
- 17 OCM III 7ML19985AB01 17
- SYNCHRONIZATION 18
- POWER CONNECTIONS 19
- DC POWER 19
- AC POWER 19
- COMMUNICATING VIA COMPUTER 20
- INSTALLING THE PROGRAMMER 20
- START UP 21
- INITIAL START UP 22
- 11: 41 a.m 24
- FUNDAMENTAL CHECKS 25
- 7ML19985AB01 OCM III 26 26
- OPERATION 27
- FLOW CALCULATION 28
- FAIL-SAFE 31
- FLOW RATE AND TOTALIZING 31
- Flow rate 31
- Viewing the data log 33
- 7ML19985AB01 OCM III 33 33
- BLANKING 34
- TEMPERATURE 34
- TIME AND DATE 34
- EMULATION MODE 35
- FLOW VELOCITY INPUT 36
- AUXILIARY HEAD INPUT 36
- DC OUTPUT 37
- DIAGNOSTIC AIDS 37
- ‘D’ PARAMETER LISTING 38
- 7ML19985AB01 OCM III 40 39
- ‘F’ PARAMETER LISTING 40
- 7ML19985AB01 OCM III 42 41
- ‘P’ PARAMETER LISTING 42
- flowrate 43
- % flow / min 48
- ‘U’ parameters required * 52
- U1 = throat width b U5 = Cd 57
- U2 = hump height p U6 = A 57
- U3 = throat length L 57
- BS-3680 RECTANGULAR FLUME 58
- blanking value, P47 58
- 7ML19985AB01 OCM III 59 58
- U0 = crest width b U3 = Cv 59
- U1 = crest height p U4 = Cd 59
- U2 = crest length L U5 = A 59
- 7ML19985AB01 OCM III 61 60
- U1 = throat width b U6 = Cd 61
- U2 = hump height p U7 = Cs 61
- U3 = throat length L U8 = A 61
- U4 = slope m 61
- BS-3680 TRAPEZOIDAL FLUME 62
- 7ML19985AB01 OCM III 63 62
- BS-3680 U-Flume, P3 = 4 63
- BS-3680 U-FLUME 64
- 7ML19985AB01 OCM III 65 64
- U0 = crest width b U3 = C 65
- U1 = crest height p U4 = Cp 65
- U2 = crest length L 65
- BS-3680 FINITE CREST WEIR 66
- 3 to 4 x h 66
- 7ML19985AB01 OCM III 67 66
- U1 = crest width b U4 = K 67
- U2 = crest height p 67
- 7ML19985AB01 OCM III 69 68
- Reference 69
- 7ML19985AB01 OCM III 71 70
- RECTANGULAR WEIR - CONTRACTED 72
- 7ML19985AB01 OCM III 73 72
- ‘U’ parameters required ** 75
- PALMER-BOWLUS FLUME 76
- blanking value, P47 76
- 7ML19985AB01 OCM III 77 76
- RECTANGULAR AREA X VELOCITY 82
- 7ML19985AB01 OCM III 83 82
- U1 = channel base width b 83
- U2 = channel depth ht 83
- TRAPEZOIDAL AREA X VELOCITY 84
- 7ML19985AB01 OCM III 85 84
- U1 = channel base width b 85
- U2 = transition height ht 85
- 7ML19985AB01 OCM III 87 86
- 7ML19985AB01 OCM III 88 87
- U-CHANNEL AREA x VELOCITY 88
- 7ML19985AB01 OCM III 89 88
- 7ML19985AB01 OCM III 90 89
- U1 = lower angle alpha (α) 91
- U2 = upper angle beta (β) 91
- U3 = transition height ht 91
- GULL WING AREA X VELOCITY 92
- 7ML19985AB01 OCM III 93 92
- U1 = bottom radius r 93
- U2 = axial displacement d 93
- 7ML19985AB01 OCM III 98 97
- MAINTENANCE 98
- ERROR CODES 99
- COMMUNICATIONS 100
- Protocol 101
- Interconnection 102
- Timed Print Out 103
- Command Response 107
- Modem Communication 109
- Establishing Communication 110
- Ending Communication 111
- *7ml19985AB01* 112
- Rev. 1.0 112
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