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Alarm devices are turned ON/OFF via relay
contacts that are part of the controller,
which set the threshold limits that
activate the relays. A typical alarm
sequence is to activate a yellow light
for Low alarm, and then to activate
a red light and audible signal for
a High alarm. It is often desirable
to silence the audible alarm while
investigating the source of alarm.
However, a simple ON/OFF switch which
disables the audible alarm can be
dangerous as the alarm condition can
remain while there is nothing to signal
it. Therefore, it is important to
consider an alarm processor to ensure
proper safety.
|
 Model 9927 Alarm Processor:
Accepts eight
channels of alarm contacts; three
alarms for Low, High and Malfunction
conditions per channel.
There are three summary relays, one for each
alarm level, an audible buzzer and
an Acknowledge push button switch.
It functions as a typical annunciator
sequence per Instrument Society
of America Sequence A, automatic
reset, as described below:
| Sequence State |
Ack Switch |
Visual
Display |
Audible
Alarm |
| Normal |
None |
OFF |
OFF |
| Alarm |
None |
Flashing |
Audible |
| Acknowledge |
Acknowledge |
On |
Silent |
| Normal |
None |
Off |
Silent |
The 9927
provides a locking key switch that
permits calibration and testing without
causing an audible alarm. Appropriate
input terminals are provided to permit
a connection to a battery power backup
source.
| 9927 Specifications |
|
| Dimensions: |
19.0"
W x 5-1/4" H x 9.0" D |
| Weight: |
|
| Power: |
110/220
VAC 50/60 Hz, 15W |
| Input
Channels: |
8 |
| Alarm
Input Per Channels: |
3 |
| Summary
Relays: |
3 (Warn, Alarm, Malfunction) |
| Relay
Operating Mode: |
Failsafe-loss of power or input connection
will de-energize relay to
the alarm state condition |
| Relay
Contacts: |
2C (DPDT)
for each, 2A resistive at
22V AC |
| Relay
Disable: |
Keyswitch (for calibration, etc.). LED
flashes to warn of disable
condition |
| Audible
Alarm: |
Pulsating audible tone for any Warn, Alarm,
or Malfunction until the Acknowledge
switch is pressed |
| Acknowledge: |
Operator push-button switch will acknowledge
all alarm conditions, restoring
relays to non-alarm state,
silencing the audible alarm,
and changing the status LED
alarm indicator from flash
to steady until alarm condition
ceases |
|
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PB100
Time Delay Relay:
Programmable,
multifunction digital time delay relay
PB100 Specifications
• 10 programmable
timing functions plus 2 counting
functions
• 0.1 second to 9990 hour programmable
timing range
• 1 to 99,900 counting range
• Universal input (24-240V 50/60
Hz, AC or DC)
• 10A, 240VAC or 30 VDC, DPDT electrochemical
relay output
• LCD digital display
• Programming thumb wheel switches
|
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Top
|
Model 9928-BH
Beacon/Horn
Wall-mount enclosure with strobe
beacon and 98 dB horn for indoor or
outdoor applications |
| 9928 Specifications |
| Enclosure: |
NEMA
12 Weatherproof for indoor
or outdoor |
| Dimensions: |
16" H x 9-1/4" W x 6-1/4" D |
| Weight: |
Approximately 10 pounds |
| Power: |
110/220 VAC 50/60 Hz, or 24
VDC optional |
| Alarm Outputs: |
|
| Visual: |
1 blue strobe beacon is standard.
Red or amber beacons available |
| Audible: |
78 to
101 dB (DC vibrating) horn |
| Manufacturer: |
Edwards
Model 875-G1 |
| Options: |
|
| Silence Switch: |
On/Off
switch to silence the horn
as needed |
| Timer
Relay: |
The timer
relay can be configured at
the factory to accomplish
several functions. The most
typical usage is to automatically
silence the built-in horn
for a specified period. IST
pre-programs the time interval
during manufacturing via a
combination of toggle switches
and timer thumb wheel switches. |
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|
Model 9938-2LH Beacon/Horn:
Wall-mount enclosure
with strobe beacon and 98 dB horn
for indoor or outdoor applications
| 9938-2LH Specifications |
| Enclosure: |
NEMA
12 Weatherproof for indoor
or outdoor |
| Dimensions: |
14" H x 9-1/4" W x 6-1/4" D |
| Weight: |
8 pounds |
| Power: |
110/220 VAC 50/60 Hz |
| Alarm
Outputs: |
|
| Visual: |
One red and one blue light |
| Audible: |
78 to
101 dB (DC vibrating) horn |
| Manufacturer: |
Edwards
Model 875-G1 |
| Options: |
|
| Silence
Switch: |
On/Off
switch to silence the horn
as needed |
| Timer Relay: |
The timer
relay can be configured
at the factory to accomplish
several functions. The most
typical usage is to automatically
silence the built-in horn
for a specified period.
IST pre-programs the time
interval during manufacturing
via a combination of toggle
switches and timer thumb
wheel switches |
|
Model 9929-LH Rack-Mount Alarm System:
Has the capabilities
and options of Model 9928 plus three
DPDT relays
5-1/4" x 19" (standard EIA dimensions) device
designed for mounting into rack
cabinet or panel. It has all of
capabilities and options of the
Model 9928. In addition, it has
three DPDT relays (one for each
type of alarm condition), rated
10 amps, resistive. These relays
may be used to activate ventilation
fans, sirens, or other equipment. |
Back to
Top
|
Model
9933-3L Alarm System:
Three visual
alarm beacons in blue, yellow &
red
Mounted on top of Model MP202
or MP204 controller
to indicate alarm and malfunction
conditions. Also available with
optional audible alarm.
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Stationary Instruments
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Portable Instruments
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Alarm Systems
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