Micromod MOD: Modcell 2050R Users Guide Uživatelský manuál stáhnout pdf (Strana 193)

IB-23C650

RATIO BIAS CONTROL

A/M RATIO BIAS STATION

The A/M ratio bias station applies a ratio or bias to the process input. The

output of the station is equal to the process x ratio, process ± bias, or process

x ratio ± bias. In this arrangement the PID algorithm is not used. Ratio or

bias values can be entered from either the operators display or through the

remote ratio or bias input (second analog input). In the blending system,

shown in Figure 24, a controller (shown in the shaded area) is used with an

A/M Ratio Bias station. This combination provides two station ratio bias

control with a remote ratio or bias source

which serves as the remote set-point

for the separate dependent variable controller. Both instruments used in a

two-station system must be equipped with an option card to provide the

second analog input.

Figure 24. Two-Stream Blending System Using A/M Ratio Bias Station

Process

Input

Process

Input

Dependent

(Controlled) Flow

Independent (Wild) Flow

Remote

Set-Point

S-1107-251

Controller

A/M Ratio

Bias Station

Flow

Transmitter

Flow

Transmitter

Remote

Ratio or

Bias

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Micromod MOD: Modcell 2050R Users Guide Uživatelský manuál Strana 193