Ohio Medical Corporation., 1111 Lakeside Drive, Gurnee, IL 60031-4099 (800/448-0770) www.ohiomedical.com
Medical Gas Alarm Manual
■
255098 (Rev.8) 07/08
Page 8
2.2 Annunciator Panel
The Annunciator Panel is the main processing board for the Medical Gas Alarm System. The
Annunciator Panel accepts information by two different means. For gas pressure, the input
signal comes from the Sensor Module and goes to the annunciator to evaluate the pressure
being observed. This information is then transmitted directly to the corresponding Area Alarm
Module where the pressure or vacuum is displayed via the ribbon cable. For source
equipment, a condition is relayed to a point on a master alarm module first and then
transferred to the Annunciator via the ribbon cable. In normal operation, the Annunciator
continuously monitors all pressure, vacuum, and source equipment for alarm conditions.
When an alarm condition is detected, an audible alarm (approximately 80 decibels measured
at 3 feet) will sound and the appropriate red LED will illuminate from the corresponding Area
or Master Alarm Module. The audible alarm will sound under one of the four conditions listed
below.
■
When the pressure input increases above a specified high set-point
□
When the pressure or vacuum decreases below a specified low set-point
■
When an alarm condition is detected on the Master Alarm Module
■
When one of the Sensor Module’s wiring has become disconnected
There are two momentary push buttons on the Annunciator Panel, which are labeled as
“TEST” and “ALARM SILENCE/RESET”. To stop the audible alarm from sounding, press the
“ALARM SILENCE” button. However, the alarm will re-sound again after the specified repeat
time has elapsed unless the alarm condition has been cleared. When a new alarm condition
is detected from another alarm panel, the audible alarm will sound again. Each time the
“Alarm Silence” button is pressed the alarm repeat time will reset. To review if the alarm’s
displays and audible alarm are in working order, press the “TEST” button for approximately 3
seconds. While testing, all display segments and independent LED’s will be illuminated and
the audible alarm will sound.
The Annunciator has a relay for wiring an external buzzer to a remote location. This relay
energizes the external buzzer when the audible alarm sounds.
A communications port is provided on the Annunciator Panel that allows for integration with a
LonWorks® network system allowing the medical gas alarm system to communicate with a
LonWorks® capable building management system.
