Circutor DHB Series Manuel d'utilisateur télécharger pdf (Page 54)

9. PROGRAMMING EXAMPLES

Example 1. Programming the meter to work with the flowmeter with reed

relay output of the following parameters:

- pulse constant 1K - 4,3956 dm

/pulse = 0,0043956 m

/pulse;

- minimal flow Q

min

– 0,02 m

The parameters of input 1 should be set as follows:

- tYP1 should be set to FreqL (frequency for (f<10kHz));

The pulse constant for scaling should be given in m

, but only five

significant digits can be set. When multiplying by a constant (SCAL set

to AND), when rounded to five digits we get value 0.0044 (introducing to

the result of the calculation error of 0.1%). To reduce the error introdu-

ced by the conversion, change the scaling by a constant dividing (SCAL

set to div) and as a constant value write the multiplicative inverse:

ConS1= =227,5002275 ≈ 227,50

When the inverse is rounded to five digits, the error introduced into the

calculations is of the size of 0.0001%.

- SCAL1 should be set to dIv, ConS1 should be set to 227,50;

- t_L1 and t_H1 should be set to a value 10 [ms] (due to the multiplication

of the pulse with a mechanical switch);

- E-In1 – if no control inputs are used, should be set to bUt;

To set the time, after which a zero flow will be indicated, the maximum time

interval between pulses should be calculated for minimum flow Q

min

maximal time interval between pulses t_

max

0,0043956

pulse weight [m

]

3600 [s]

min

]

0,0043956

3600 [s]

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Circutor DHB Series Manuel d'utilisateur Page 54