Med Touch Series LCD Alarm Systems
Powerex
•
150 Production Drive
•
Harrison, OH 45030
•
USA
P 1.888.769.7979
•
F 513.367.3125
•
www.powerexinc.com
IN597400AV
•
08/2016
Page 39 of 56
AC
Alternating Current
An electric current that reverses direction or polarity
at regular intervals.
BAR
A measurement of force in a compressed gas system.
1 BAR = 14.5 PSI or 1 BAR = 100 kPa
DC
Direct Current
An electric current that flows in one direction. The
current can be steady or pulse.
IN Hg Inches of Mercury
A measurement of the force in a gas vacuum system.
1 IN Hg = 3.38 kPa.
KPa Kilopascals
A measurement of the force in a compressed gas
system.
1 kPa = .14 PSI
Latching Alarm Relay
Requires manual intervention (pressing the Silence
button) to silence the alarm buzzer if the alarm condition
has corrected itself.
LCD
Liquid Crystal Display
A semiconductor liquid crystal film sealed between glass
plates that changes its optical properties when voltage is
applied.
LED
Light Emitting Diode
A semiconductor diode that converts applied voltage to
light.
mmHG
A measurement of force in a gas vacuum system.
1 mmHg = .019 PSI or 1 mmHg = .039 inHg.
NFPA National Fire Protection Association
The National Fire Protection Association is an
association engaged in standards development.
NO
Normally Open
An electrical circuit in which the switch is normally
open. No current flows through the circuit in normal
operation. Only when the switch is closed is the flow
of current started.
Non-Latching Alarm Relay
The alarm buzzer will silence itself when the alarm
condition is corrected.
NC
Normally Closed
An electrical circuit in which the switch is normally
closed. Current flows through the circuit in normal
operation. Only when the switch is opened is the
flow of current stopped.
PSI
Pounds per Square Inch
A measurement of the force in a compressed gas
system.
1 PSI = 6.9 kPa
Transducer
A device that converts pressure into an electrical
signal.
V Voltage
Voltage is electrical pressure or force. One volt is
equal to the difference of electrical potential
between two points on a conducting wire carrying a
constant current of one ampere when the power
dissipated between the points is one watt.
Transient Signal
An intermittent and brief signal that quickly corrects
and returns the alarm to a normal operating mode
before monitoring personnel can silence the alarm.
Appendix A
Glossary of Terms
