Micromod Micro-DCI: 53SL6000 Single Loop Controller Bedienungsanleitung PDF herunterladen (Seite 57)

6.3.7 SEL Mode

The selector allows one of four analog input values

to be passed to the analog output based on the

values of the two digital inputs (E and F). Three of

the analog inputs (B, C, and D) can be scaled by

the constants K1 through K6. The switching dia-

gram below the equation shows how the digital

inputs control the value passed to the analog out-

put.

if E

1 and F

1, then X

K5D

if E

1 and F

0, then X

K3C

if E

0 and F

1, then X

K1B

if E

0 F

then X

6.3.8 Gas Flow Compensation

Equations

Pressure and temperature compensated gas flow

equations for both linear and square root flow ele-

ments are provided to compute the mass flow or

"standard volume" flow of a gas. The equations

handle both perfect and imperfect gases. Three

inputs representing A - flow (differential pressure),

B - absolute pressure, and C - absolute tempera-

ture are converted to a flow output signal based on

a set on parameters K1 through K6.

Imperfect Gases in Operating Zone

K1 Overall meter coefficient

K2 Slope of Y factor line (negative)

K3 Coefficient in density equation

K4 Pressure bias in density equation

K5 Temperature bias in density equation

K6 Density bias in density equation

K3-K6 Inputs for Gas that Behaves as

Perfect Gas in Operating Zone

K3 Molecular weight/Universal Gas

Constant, R

K4 0

460

R or 273

K6 0

K2 Input if Acoustic Ratio is Very Low

(Y = 1.0)

K2 0

6.3.8.1 Linear Gas Flow Compensation

(LFLo) Equation

K1A

[

−

]

A is actual CFM volumetric flow

B is absolute pressure

C is temperature (in R or K)

6.3.8.2 Square Root Gas Flow

Compensation (SFLo) Equation

[

−

]

√



[

−

]

A is measured differential pressure

B is absolute pressure

C is temperature (in R or K)

6.4 Logic Blocks 1, 2, 3, and 4

As shown in the figures below, each logic block

1,2,3, and 4 can perform a selected mode of opera-

tion on two input variables A and B to produce an

output at LG(1-4). Inputs A and B, as well as the

output, are all logic values (0/1). The applicable

modes of operation and the selectable inputs for all

four logic blocks are provided in Table 6-3 and the

outputs produced by the various operating modes

are summarized in Table 6-4.

Section 6. Signal Value Modification 53SL6000 Instruction Bulletin

6-7

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 137 138

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