H E A D E R
0178-1737-000 Rev. A
3
1/INTRODUCTION
2/GENERAL INFORMATION
This manual gives the recom-
mended operating instructions
for the BeaconMedæs Area
Line Pressure Alarm Panel.
Every procedure listed is per-
formable by the operator of this
equipment. For service informa-
tion, refer to the BeaconMedæs
Area Line Pressure Alarm Panel
Service Manual.
Figure 1
Area Alarm Circuit
2.1 Description
The area line pressure alarm panel is a wall mounted unit
that monitors the gas pressure (or vacuum) in up to six
separate lines and sounds an alarm if preset limits are
violated (Figure 1).
One panel holds up to six gauges. Each gauge is labeled
with a color-coded label for the gas it monitors. In the
event of an alarm, a red indicator (labeled ABNORMAL)
glows next to the gauge for the affected gas (Figure 2).
Each switch gauge is wired in a closed loop: if a wire
breaks, or is disconnected from the circuit board or
switch, the alarm panel sounds an alarm (Figure 3).
The panel has a test switch that exercises the electronics
assembly. Remove the louvered panels to test the switch
gauges. This means that the unit can be tested for func-
tionality without major disassembly or special test equip-
ment.
Use only approved service procedures and genuine
replace ment parts for repairs. Complete service informa-
tion and a list of available replacement parts are provided
in the Service Manual.
2.2 Dry Contact Relays
The alarm panel contains seven dry contact relays for
interface to remote equipment. The connection to these
relays is made at the circuit board. One relay indicates
normal conditions; the other six will indicate alarm condi-
tions.
These relays can operate as normally open or normally
closed switches depending on how the connections are
made. Refer to the installation instructions or service
manual for the wiring diagram.
2.3 Specifications
Gases Monitored: From one to six of the following gases
can be monitored. O
2
, N
2
O, N
2
, AIR, CO
2
, VAC, EVAC.
Dimensions
Alarm Panel:
14 in. x 9 3/4 in.
(35.6cm x 24.6cm)
Enclosure (rough-in box):
12 5/8 in. x 8 3/8 in. x 3 5/8 in.
(32.5cm x 21.3cm x 9.5 cm)
Color Coding
Standard, USA color coded labels for all readouts.
Optional Canadian and ISO color coded labels available.
Power Requirements
Standard 120 V~, 60 Hz, 25 watts (max.)
Export Only 220 V~, 50 Hz, 25 watts (max.)
Note:
The 120 V~ model is listed by Underwriters
Laboratories. The 220 V~ model has not been investi-
gated.
Leakage Current
Less than 100 uA
Circuit Type
Closed loop-alarm on ground contact or open circuit
Control Unit
Microprocessor-Motorola 6805 Series
Gauge Accuracy:
Gas
Indicating Gauge
Switch Gauge
Nominal 50 psi
±2 psi (25-75 psi)
±2 psi (33-66 psi)
Medical Gases
±3 psi elsewhere
±3 psi elsewhere
Nominal 180 psi
±6 psi (75-225 psi)
±6 psi (100-200 psi)
Gas
±9 psi elsewhere
±9 psi elsewhere
Vacuum Switch
±.6 in. Hg
(7.5-22.5 in. Hg)
±.6 in. Hg (10-20 in. Hg)
±.9 in. Hg elsewhere
±.9 in. Hg elsewhere
Gauge Overpressure Limit
Indicating Gauge
Switch Gauge
Oxygen
110 psig
150 psig
Nitrous Oxide
110 psig
150 psig
Air
110 psig
150 psig
Carbon Dioxide
110 psig
150 psig
Nitrogen
330 psig
400 psig
Vacuum
(Do not pressurize)
45 psig
Note:
If line pressure should fall or rise to
set alarm limits the gauge needle will
interrupt current flow and cause an alarm
condition.
