Ariens Path-Pro 136E User Manual download pdf (Page 55)

Alarm Types

There are three Alarm Types for each alarm. ALTYPl and ALTYP2 are the

prompts for Alarm 1 and Alarm 2, respectively. The choices are:

Process

alarm

(P),

or Deviation alarm (D).

For review, a “process” type alarm is one that is set at a fixed degree dis-

tance, either positive or negative, from the mean

O°F

O°C.

A “deviation”

type alarm is always a fixed degree distance, positive or negative, from Set

Point (SP).

If we change SP, a process type alarm remains where it was originally set,

while a deviation type alarm will shift with SP the same number of degrees as

its value. The examples illustrate a plot of each alarm type.

Here we’ve added a process alarm function to the basic graph.

SP1

,.................

. .

Fixed Distance

from

O°

Actual

0°C

/---

,.I

Time

This graph shows a deviation alarm setting, and how it shifts with a change in SP.

Temp

SPl

Actual

Deviation Alarm

Fixed Degree distance from

SP*

Time

New SP

Figure

Alarm Type for

Alarm 1 is

“process”

alarm

(ALTYP

=P)

Figure

Alarm

Type for

Alarm

“devia-

tion”

alarm

(ALTYP=D).

How To Use The Alarms, Chapter 7

WATLOW Series 920

User's

Manual 55

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Ariens Path-Pro 136E User Manual Page 55

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