Delta RMC101 Bedienungsanleitung PDF herunterladen (Seite 837)

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101

Appendix C: Parameter Field Reference

C-67

Example 2

Suppose a pressure transducer gives an output from 4 to 20mA. This range is represented by

Counts from 6500 to 32500. Also suppose that the range of pressures which will be used are

from 0 to 10 bars, and 0.0 bars read 6487 counts and 10.0 bars read 32662 counts. We must

choose our position units first. It is not a good idea to just use bars, as the user will only be able

to see 0 to 10 bars and no fractions. Therefore, it makes more sense to use millibars as position

units and go from 0 to 10,000 millibars. The scale calculation goes as follows:

Again, since the scale is less than 16383.5, use the Prescale Divisor bits in the Configuration

Word to divide the transducer counts by 2. Then multiply the scale by 2 to obtain:

Assuming we cannot or do not want to verify the gauge’s accuracy, we can use the specified

gauge requirements. Therefore, we assume that 0.0 bars reads 6500 counts, and 10.0 bars reads

32500 counts. Using these numbers, we get the following equation:

Again, we will apply a Prescale Divisor of 2 to obtain:

Next, we must calculate the offset. We use the following equation:

Therefore, by using the first point (0 psi at 6500 counts or 4mA) and the second

method of calculating the scale, we get the following:

Example 3

Suppose we want to control differential force. We use the same gauges on both the A and B

sides of the cylinder. These gauges are rated to have 4mA at 0 psi and 20mA at 7500 psi.

Therefore, each channel will have 6500 counts at 0 psi and 32500 counts at 7500 psi. The

cylinder has an internal diameter of 6 inches. The rod has an outside diameter of 2 inches.

Therefore we find the maximum force applied on each end:

Force = Pressure x Area

1 2 ... 832 833 834 835 836 837 838 839 840 841 842 ... 950 951

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