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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017
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918SB Single Channel Alarm
The 918SB is designed to provide a visible and audible alarm. The 918SB does not have a front panel Alarm
Indicator. The 918SB may be used anywhere that a single set of dry contacts are available. The 918SB can
be configured to respond to either Normally Open (default configuration) or Normally Closed contacts. Two
possible primary applications are use as an overfill alarm or as an interstitial alarm.
918DB Dual Channel Alarm
The 918DB is designed to provide a visible and audible alarm. The 918DB has two front panel Alarm
Indicators to indicate which channel is being alarmed. The 918DB may be used anywhere that up to two
sets of dry contacts are available. The 918DB can be configured to respond to either Normally Open (default
configuration) or Normally Closed contacts. Two possible primary applications for each channel are as an
overfill alarm or as an interstitial alarm.
918QB Quad Channel Alarm
The 918QB is designed to provide a visible and audible alarm. The 918QB has four front panel Alarm
Indicators to indicate which channel is being alarmed. The 918QB may be used anywhere that up to four
sets of dry contacts are available. The 918QB can be configured to respond to either Normally Open (default
configuration) or Normally Closed contacts. Two possible primary applications for each channel are as an
overfill alarm or as an interstitial alarm.
Failure to follow any or all of the warnings and instructions in this document could result in a hazardous
liquid spill, which could result in property damage, environmental contamination, fire, explosion, serious
injury or death.
Le fait de ne pas se conformer à l’un ou l’autre des avertissements ou à l’une ou l’autre des directives
apparaissant dans ce document pourrait donner lieu à des déversements de liquides dangereux, lesquels
pourraient engendrer des dommages matériels, des risques de contamination environnementale,
d’incendie ou d’explosion, des blessures graves ou la mort.
Specifications
The 918SB, 918DB and 918QB are intrinsically safe devices for use in Class I, Division 1, Group D, T4 and
Zone 2, Group IIA, T4 Hazardous locations when powered by Morrison Bros. Co. battery pack part number
918SB-0128 2B.
WARNING:
This is an intrinsically safe device and must be wired in accordance with National Electrical Code
Article 504. This device and its wiring may not share any junction box, conduit, or raceway with any other type
circuit or wiring. Do not perform live maintenance. Do not substitute components with anything other than
Morrison Bros. Co. components. Care must be taken to avoid an ignition hazard from impact or friction with the
enclosure.
AVERTISSEMENT:
Cet appareil intrinsèquement sécuritaire doit être branché conformément à l’article
504 du code électrique national. Il se peut que ce dispositif et son câblage ne partagent pas de boîte de
connexion, de conduit ou de canalisation avec un autre type de circuit ou de câblage. Ne menez pas de travaux
de maintenance sous tension. Ne remplacez les composantes que par des composantes de Morrison Bros. Co.
Assurez-vous d’éviter le risque d’infl ammation pouvant découler d’un impact ou de friction avec l’enceinte.
Entity Parameters for Terminals P1 through P4:
Operating Temperature: -40ºF to 140ºF (-40ºC to 60ºC)
Maximum Wiring Distance: Maximum wiring distance between Alarm and input device is 500 ft.
918SB, 918DB, and 918QB Series Alarms
Installation, Operation, and Maintenance Instructions
V
OC
= 7.525 VDC
I
SC
= 31 mA Ca = 700 μF La = 105 μH P
O
= 0.06 W
