Milltronics CVCC Instrukcja Obsługi Strona 28
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Oceniono. / 5. Na podstawie oceny klientów
FLOW CALCULATION
Absolute vs. ratiometric
The OCM-3 can be programmed to use either of two methods (P4) for calculating flow
from the head measurement: absolute or ratiometric. The result is the same
regardless of the method used. The principal difference is the information that must
be entered in order for the OCM-3 to carry out the calculation. The user’s choice of
method may ultimately be based upon the information which is at hand. Refer to U
parameters for the primary element selected for a listing of the information required.
For the ratiometric method, it is usually sufficient that the user know the flow rate
(Q
cal
) which occurs at maximum head (h
cal
).
On the other hand, absolute calculations require that the user enter information such
as: the physical dimensions of the primary element and the constant relating to units
of measure for both linear dimensions and flow rates.
e.g.
the general formula for flow through a single exponent primary element is:
Q = KH
x
the specific formula for flow through a 45° V-notch weir is:
cfs = 1.03H
2.5
thus: Q = flow in cubic feet per second
K = constant of 1.03
H = head in feet
The absolute method is not applicable to the following:
Palmer Bowlus flume
H flume
DISPLAY
The normal display during operation is the Flow and Total Display (F2).
status field
flow rate field
totalizer field
relay / "no echo" field
7ML19985AB01 OCM III 28
- 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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