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11.9 WEIGH - SPEED CHARACTER TABLE 9
Digit 15 d /sec. Digit 15 d / sec Digit 15 d / sec.
@ 0 T 20 h 40
A 1 U 21 i 41
B 2 V 22 j 42
C 3 W 23 k 43
D 4 X 24 l 44
E 5 Y 25 m 45
F 6 Z 26 n 46
G 7 [ 27 o 47
H 8 \ 28 p 48
I 9 ] 29 q 49
J 10 ^ 30 r 50
K 11 - 31 s 51
L 12 ` 32 t 52
M 13 a 33 u 53
N 14 b 34 v 54
O 15 c 35 w 55
P 16 d 36 x 56
Q 17 e 37 y 57
R 18 f 38 z 58
S 19 g 39 { > 58
Digit 15 of the string “weight” shows the speed of in- or decrease of the actual weight value.
It is expressed as an ASCII character, as in the first column of the table above.
The value is recalculated every 28 msec, based upon the last 12 weight conversions.
The value is expressed in scale division per second: d / sec.
Increase or decrease of the weight value may be deducted from digit 12 : a + or - sign.
The speed calculation is done on the high resolution level of the A/D conversion output.
Rounding offs are not neglected but entered into the next measurement.
It is advised to select the communication speed at at least 9800 Bd. The accuracy is that speed 100 %.
Example:
A 300 kg weighing machine has 0.1 kg scale divisions.
If digit 15 shows character G ( = 7, see table), the increase of weight is 7 x 0,1 kg = 7,0 kg per second exact.
Running on for 1 minute it indicates: there has been an increase of weight of 60 x 7,0 kg = 420 kg exact.
Applications:
- Loss in weight systems
- Control of the dosing speed at continuous dosing systems
- Check whether a started dosing really results into increase of weight
- Check whether the dosing speed comes up to the expected speed of weight increase
- Check on undesired weight changes (f.e. a not closed or leaking valve)
- Presentation of the actual dosing speed on the operators control screen
Manual 348-2 V 3.1 Page 47 01-06-2007
47


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