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PROPRIETARY AND CONFIDENTIAL DRAFT 28/Feb/03

Detailed Component Descriptions
1
Chapter 1: Introduction

Area Alarm

The Area Alarm Modules provide a digital display of the actual pressure or
vacuum being monitored (see figure 1-14 on page 1-29).

Figure 1-14. Area Alarm

In addition to the digital display, separate Normal, High, and Low LED
indicators are on each module: a green LED is used for Normal condition, and
red LEDs are used for High and Low alarm conditions. Each module also has
its own Test and Silence keys. The audible alarm is mounted on either the Area
Alarm Connector P.C. Board or the Network Communications Board.

Pressing the Increment key displays the high pressure setpoint, and pressing
the Decrement key displays the low pressure setpoint.

The Area Alarm Modules are configured at the factory for a specific type of
gas or vacuum and with either English or metric units of measure, specified by
the customer. The High and Low setpoints for the Area Alarm Modules are
pre-set according to NFPA 99 standards (see table 1-4 on page 1-30).
However, the setpoints can be adjusted in the field.

MedPlus TotalAlert™ Alarm Network Operation and Maintenance Manual (man291ra) Page 1 - 29