Installation & Operating Instructions for
MA24 & MA115 Series Remote Alarm Systems
Powerex
•
150 Production Drive
•
Harrison, OH 45030
•
USA
T 1.888.769.7979
•
F 513.367.3125
•
www.powerexinc.com
IN596400AV
•
01/2016
Page 2 of 4
Introduction
Powerex remote alarms are designed to attach to Powerex
manifold systems or to pressure switches. They signal an alarm
condition is present.
A typical alarm setup signals when pressure in the supply
cylinders of a manifold goes below a set point, indicating the
cylinders need replacing.
All of the Powerex Remote Alarm models activate when the
control circuit opens. The open circuit signals an alarm condition.
A closed circuit indicates a system normal condition.
Powerex manufactures the six remote alarm models shown
below.
PX-MA24-1V
PX-MA115-1V
PX-MA24-1AV
PX-MA115-1AV
PX-MA24-2AV
PX-MA115-2AV
Model Descriptions
The PX-MA24 models require a 24 VAC power source. These
models are designed to attach to a Powerex automatic or
semiautomatic switchover manifold. The 24 VAC power comes
from the power supply provided with the manifold control box
(Part # PX-1118-0100). The power supply box also contains dry
contacts which are activated by pressure switches inside the
manifold control box. When these dry contacts are connected to
the Powerex PX-MA24 remote alarm, the alarm gives a visual or
audio/visual indication of a low supply gas condition.
The PX-MA115 models are designed to connect to 115 VAC.
These units have an internal transformer and an external six (6)
foot power cord that terminates in a stan dard two-prong 115
VAC plug. These units are designed to attach to any pressure
switch(es) on any manifold system to signal an alarm condition.
The 115 VAC models all utilize 12 VAC internal power to sense the
open or closed condition across the pressure switch.
The PX-MA24-1V and PX-MA115-1V models (Figures 1 and 2)
have provisions for connec tion to a single manifold or pressure
switch. The 1V models have a single set of lights to indicate
the low pressure condition. The set of lights consist of a green
“System Normal” and a red “Bank Depleted” light. The “System
Normal” light is activated as long as the manifold or pressure
switch circuit is in a closed condition and power is supplied to
the alarm box. When the alarm circuit opens, the green “’System
Normal” light goes out and the red “Bank Depleted” light goes
on.
The PX-MA24-1AV and PX-MA115-1AV models (Figures 3 and 4)
have provisions for con nection to a single manifold or pressure
switch. The 1AV models have a single set of lights and a buzzer
that sounds to signal that an alarm condition is present. The
single set of lights consists of a green “System Normal” and a red
“Bank Depleted” light There is a squelch button on the front of
the 1AV panel. Pushing the squelch button stops the buzzer. The
buzzer automatically resets when the normal condition resumes.
The PX-MA24-2AV and PX-MA115-2AV models (Figures 5 and 6)
have provisions to attach to two manifolds or pressure switches.
The 2AV models have two sets of lights, each set attached to a
different manifold sensor. Each set of lights consists of a green
“System Normal” and a red “Bank Depleted” light.
The 2AV models also have one buzzer which sounds when either
bank reaches an alarm condition. Like the 1AV models, the 2AV
has a squelch button that silences the buzzer when pushed. The
buzzer automatically resets when the normal condition resumes.
Figure 1: PX-MA24-1V
Figure 2: PX-MA115-1V
Figure 3: PX-MA24-1AV
Figure 4: PX-MA115-1AV
Figure 5: PX-MA24-2AV
Figure 6: PX-MA115-2AV
