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Function Blocks

Function Block Reference Guide 3/99166

2.54 RH Function Block

Description

The

label stands for

Relative Humidity

This block is part of the

Calculations

category. It looks like

this graphically on the Control Builder.

Function

Calculates RH as a function of wet bulb temperature, dry bulb temperature and atmospheric pressure.

0-100% RH is output as a floating point number between 0 and 100.

Input

DRY = Dry Bulb Temperature (°F, metric = °C)

WET = Wet Bulb Temperature (°F, metric = °C)

PRES = Atmospheric Pressure (psi, metric = Pa)

Output

RH = Relative Humidity (0-100)

Block Properties

Double click on the function block to access the

function block properties dialog box.

Block Order (Read Only)

You can change the assigned execution order

number by selecting “Execution Order” in the

“Configure” menu and arrange the order to suit

your control strategy.

Metric System

Click on this box to select Metric Units.

Table 2-47

lists the units for the inputs and

outputs.

Continued next page

Honeywell UMC800 Reference Guide

Other manuals for Honeywell UMC800