Morrison Bros. co. 918SB Series Manual

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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 congured to respond to either Normally Open (default conguration) or Normally Closed contacts. Two
possible primary applications are use as an overll 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 congured to respond to either Normally Open (default
conguration) or Normally Closed contacts. Two possible primary applications for each channel are as an
overll 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 congured to respond to either Normally Open (default
conguration) or Normally Closed contacts. Two possible primary applications for each channel are as an
overll 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, re, 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.
Specications
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’in 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
VOC = 7.525 VDC ISC = 31 mA Ca = 700 μF La = 105 μH PO = 0.06 W

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017
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Alarm Installation and Testing
WARNINGS
• Fire Hazard – Death or serious injury could result from spilled liquids.
• You must be trained to install or maintain this alarm. Stop now if you have not been trained.
• Any modication of this unit beyond what is outlined in this instruction will void product warranty.
• For your safety, it is important to follow local, state, federal and/or OSHA rules that apply to working
inside, above, or around the storage tank and piping area. Use all personal protective equipment required for
working in the specic environment.
• This device is intended to be used as an auxiliary warning to the operator of an abnormal condition of
the system, such as a possible overll situation and should not be the only system in place to prevent an
unwanted condition, such as preventing a tank from overlling. It is the sole responsibility of the operator to
continuously prevent any spillage regardless of the situation.
• Tanks could be under pressure. Vapors could be expelled from tank vents, piping, valves or ttings while
performing maintenance. Vapors could catch re or cause an explosion. Avoid sparks, open ame, or hot
tools when working on tank system.
• Use a dampened cloth when cleaning the alarm enclosure to prevent static buildup and discharge.
• The only battery approved for use with the 918 Series Alarm is the Morrison Bros. Co. battery pack part
number 918SB-0128 2B.
• In the event of malfunction, contact Morrison Bros. Customer Service.
AVERTISSEMENTS
• Risque d’incendie – Un déversement de liquide pourrait entraîner des blessures graves ou la mort.
• Vous devez avoir reçu une formation pour installer cette alarme ou en assurer la maintenance. Arrêtez-vous
immédiatement si vous n’avez reçu aucune formation à cet effet.
• Toutes les modications apportées à cette unité autres que celles indiquées dans ces directives engendreront
l’annulation de la garantie du produit.
• Pour assurer votre sécurité, il est important de vous conformer à la réglementation locale, d’État, fédérale
ou OSHA régissant les travaux à l’intérieur, au-dessus ou autour du réservoir de stockage et de la zone de
canalisation. Utilisez tout l’équipement de protection individuelle exigé pour travailler dans l’environnement
spéci que.
• Cet appareil est destiné à être utilisé comme mécanisme avertissant l’opérateur d’un état anormal du système
tel une situation de remplissage excessif et ne devrait pas être le seul système en place pour empêcher un état
indésirable, par exemple, un réservoir qui se remplit trop. L’opérateur a l’entière responsabilité de s’assurer
continuellement de prévenir tout déversement, quelle que soit la situation.
• Les réservoirs pourraient être sous pression. Des vapeurs pourraient être expulsées des conduits d’aération,
des canalisations, des soupapes ou des raccords du réservoir durant la maintenance. Les vapeurs pourraient
s’en ammer ou engendrer une explosion. Évitez les étincelles, les  ammes nues ou les outils chauds lors de
travaux menés dans le système du réservoir.
• Utilisez un linge humide pour nettoyer l’enceinte de l’alarme a n de prévenir l’accumulation d’électricité
statique et les décharges.
• La seule pile approuvée aux  ns d’utilisation avec l’alarme de série 918 est le bloc-piles de Morrison Bros.
Co. (pièce #918SB-0128 2B).
• En cas de défaillance, communiquez avec le service à la clientèle de Morrison Bros.
Note: As dened in Article 501 – Class 1 Locations of NFPA 70, this apparatus and its connected wiring are
intrinsically safe. Under normal conditions this apparatus and its wiring cannot release sufcient energy to ignite
a specic ignitable atmospheric mixture by opening, shorting, or grounding.
NOTICE: Care should be taken to avoid impacting the sounding device (buzzer/beeper) associated with this
product in order to prevent damage to the device and possible excess energy production.

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017
WARNING: Interconnect wiring between the gauge and the alarm unit must be kept totally isolated and separate
from any other wiring. This wiring must not share any junction box, conduit, raceway, or xtures with circuits
other than those dened by NEC as being intrinsically safe for all Class 1 locations.
AVERTISSEMENT: Le câblage d’interconnexion entre la jauge et l’unité d’alarme doit être complètement
isolé et distinct du reste du câblage. Le câblage ne doit partager aucune boîte de connexion, aucun conduit,
aucune canalisation, ni aucun accessoire avec des circuits autres que ceux dé nis par NEC comme étant
intrinsèquement sécuritaires pour tous les emplacements de classe 1.
Location: NEC ARTICLE 501-3-CLASS 1 Locations exempt intrinsically safe enclosures in paragraph
501-3(b)(1)(c), and therefore may be placed in the most convenient location but must be within reach of the
operator and within audible range.
Mounting: Since a general purpose NEMA 4X enclosure is used to protect the alarm circuits and batteries,
any mounting holes, conduit, or fasteners must be sealed in order to maintain the waterproof integrity of the
enclosure. All penetrations into the enclosure must be made at the bottom of the Alarm Box.
Steps
1. Wire Input Device
a. Run two stranded conductor oil and gas resistant wires from each input device to the location where
the alarm box will be mounted. Do NOT attach the wires to the wires in the junction box of the input
device(s) at this time. Although not required, it is recommended to run the wires in some type of conduit
in order to protect them against possible damage and environmental conditions. It may be necessary to
remove the junction box cover of the input device(s).
INPUT DEVICE WIRING WIRE SIZE LIMITS:
Input device wiring shall have a minimum cross section of 0.4 mm2 (equivalent of a single 26 AWG wire)
to a maximum cross section of 1.0 mm2 (the equivalent of a single 18 AWG wire).
b. Do NOT attach the wires to the wires in the junction box of the input device at this time.
2. Mount the Alarm
a. Separate the two halves of the Alarm Unit box by loosening the Phillips head fasteners visible at the four
corners of the front panel.
b. Support the front panel while mounting the rear half.
c. Attach the rear half of the box to a suitable xture.
d. Seal any penetrations made into the interior of the box to prevent moisture ingress.
3. Test the Alarm.
a. Turn on the power switch, SW5 (see Figure 1).
b. Press and hold the “Test/Cancel” button for more than ve seconds while listening to the Audible Alarm
and observing the Beacon, the Channel Alarm and BATTERY LOW Indicators (see Figure 1).
c. Observe the 918 Series Alarm indicates the following:
• The BATTERY LOW indicator will ash momentarily at the beginning of the cycle.
• If the Audible Alarm is congured to sound with an alarm condition, it is loud and strong.
Fig. 1 Alarm with Beacon, Power Switch (SW5), Channel Alarm Indicators,
Battery Low Indicator and Test/Cancel Button on the 918DB
SW5
ON OFF
Channel Alarm
Indicators
Low Battery
Indicator
Test/Cancel
Button
Beacon

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017
The Channel Input Connector Insert the wire fully into the connector and snug the screw.
Figure 2 Wiring the Channel Input Connector
• The Channel Alarm indicators will illuminate when the Beacon is not illuminated and the Audible
Alarm is not sounding (if so congured).
• Beacon is illuminated when the Audible Alarm is NOT sounding (if congured to sound when an alarm
event occurs) and the Channel Alarm indicators are not illuminated.
• BATTERY LOW indicator is NOT illuminated after the initial momentary ash.
d. Troubleshoot as needed. If the Audible Alarm does not sound, the Beacon does not ash or the
BATTERY LOW indicator illuminates after the initial ash, replace the 918SB Battery Assembly (see
instructions, below). If the Audible Alarm still does not sound, the Beacon does not illuminate, or the
BATTERY LOW indicator illuminates, replace the Alarm Box or call Morrison Bros. Co. Customer
Service.
e. Turn off the power switch, SW5 before proceeding (see Figure 1).
4. Connect the two wires from each input device to the Input of the Alarm
a. Connect the two wires from each input device to their respective Channel Input Connector(s) (see Figure
2).
b. Verify that the wires are securely held in the connector by gently tugging on them. Plug the connector
onto the Channel Input pins of the Alarm Circuit Board (see Figure 3).
Strip off about ¼ inch (5mm) of insulation from the wire and twist the striped end to eliminate stray wire
strands as shown above.
Figure 3 Plug the Channel Input Connector(s) onto the Channel
Input Pins of the Alarm Circuit Board (918QB shown)
Channel 1
J1/P1
(SB/DB/QB)
Channel 2
J2/P2
(DB/QB)
Channel 3
J3/P3
(QB)
Channel 4
J4/P4
(QB)

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017
5. DIP Switch Conguration. Changing the DIP switch conguration settings requires two steps:
• Congure the DIP switch, SW3 as desired.
• Press and release the RESET button, SW4 (see Figure 4).
POSITION FUNCTION MODELS
1
Audible Alarm
ON (default) = ENABLED
OFF = DISABLED
918SB
918DB
918QB
2
Auto Silence
ON (default) = ENABLED
OFF = DISABLED
918SB
918DB
918QB
3
Channel 1 Normally Closed/Open
ON = Normally Closed Contacts
OFF (default) = Normally Open Contacts
918SB
918DB
918QB
4
Channel 2 Normally Closed/Open
ON = Normally Closed Contacts
OFF (default) Normally Open Contacts
918DB
918QB
5
Channel 3 Normally Closed/Open
ON = Normally Closed Contacts
OFF (default) = Normally Open Contacts
918QB
6
Channel 4 Normally Closed/Open
ON = Normally Closed Contacts
OFF (default) = Normally Open Contacts
918QB
Table 1 Conguration Dip Switch Summary
Figure 5 Conguration DIP Switch
Figure 4 RESET button

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017
a. AUDIBLE ALARM OPTION
i. To Enable the Audible Alarm for Alarms (default): If the Audible Alarm is to sound when an
alarm condition occurs, place DIP switch position 1 in the ON position.
ii. To Disable the Audible Alarm: If the Audible Alarm is NOT to sound when an alarm condition
occurs, place DIP switch position 1 in the OFF position.
NOTICE: When the Audible Alarm is disabled (silent operation) the alarm condition will only ash
the Beacon and illuminate the Channel Alarm Indicator(s). Ensure that the Alarm is in a position
where it can be clearly seen so that an alarm condition does not go unnoticed.
NOTICE: When the Audible Alarm is disabled (silent operation) Audible Alarm will not sound
during the Test Mode.
b. AUTO-SILENCE OPTION
i. To Enable the Autosilence Feature (default): If the 918 Series Alarm is to silence itself after
being in an alarm condition for 10 minutes, place DIP switch, position 2 in the ON position.
ii. To Disable the Autosilence Feature: If the 918 Series Alarm is to continue to ash its Beacon,
illuminate its Channel Alarm Indicators (918DB and 918QB) and sound the Audible Alarm (if
enabled) until either an operator acknowledges the alarm by pressing the Test/Cancel button or the
battery is no longer able to power the Alarm Box, place DIP switch, position 2 in the OFF position.
NOTICE: When the Autosilence feature is disabled, the Alarm will ash its Beacon, illuminate its
Channel Alarm Indicator(s) (918DB and 918QB) and sound the Audible Alarm (if so congured)
until the battery can no longer power the Alarm Box. Operational verication should be checked
on a more frequent schedule if the Autosilence feature is disabled.
c. CONTACT MODE OPTION
i. Normally Open Contact Input Devices (default): If the input device(s) to be connected to the
918 Series Alarm utilize normally open contacts, set DIP switch, position from Table 2 in the OFF
position (see Figure 5).
ii. Normally Closed Contact Input Devices: If the input device(s) to be connected to the 918 Series
Alarm utilize normally closed contacts, set DIP switch, position from Table 2 in the ON position
(see Figure 5).
NOTICE: When the 918 Series Alarm is congured for Normally Closed Contact input devices,
the long term battery life will be somewhat shorter due to the current that must continuously ow
through the contacts to verify their position. Operational verication should be checked on a more
frequent schedule if the inputs are congured for Normally Closed Contacts.
NOTICE: Changing the DIP switch conguration settings requires two steps:
• Congure the DIP switch, SW3 as desired.
• Press and release the RESET button, SW4 (see Figure 4).
6. Power Switch
a. Turn OFF the power (DEFAULT): To turn OFF to the 918 Series Alarm, place SW5 in the OFF
position. (see Figure 1)
b. Turn ON the Power: To turn ON the power to the 918 Series Alarm, place SW5 in the ON position
(see Figure 1)
Channel DIP Switch Position
1 3
24
35
4 6
Table 2 Channel to DIP Switch Position Mapping

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017
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!
7. Reattach the front cover of the Alarm using the fasteners at the four corners of the cover. DO NOT
OVERTIGHTEN. “Snug” the fasteners in place and verify that the cover is fully seated to the enclosure base.
8. Test the Installation
a. Test connection at the alarm and wiring
i. For Normally Open Contact Inputs:
Short the two wires together at the input device end for each input device. This should cause the
alarm to ash the Beacon, illuminate its Channel Alarm Indicator(s) and sound (if so congured)
until the Test/Cancel button is pushed. If the alarm fails to go into an alarm condition, check the
connections and the batteries and retest until results are satisfactory.
ii. For Normally Closed Contact Inputs:
Short the two wires together and then separate the wires at the input device end for each input
device. This should cause the alarm to ash the Beacon, illuminate its Channel Alarm Indicator(s)
and sound (if so congured) until the Test/Cancel button is pushed. If the alarm fails to go into an
alarm condition, check the connections and the batteries and retest until results are satisfactory.
b. Connect the wires from the Alarm Box to the wires of the input device at the junction box for each
device.
c. Replace the junction box cover.
d. Simulate an alarm condition and manually trigger the alarm using the input device (Clock Gauge, oat
switch or other dry contact device).
e. Troubleshoot as needed. If the Alarm does not go into an alarm condition, check wiring at junction
box and verify that the installation procedure was performed correctly. The alarm can be silenced after
being activated by pressing the Test/Cancel button.
9. IMPORTANT: Install the included Warning Tag where it will be visible to the operator lling or unloading
the tank that is tted with this 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, re, 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.
Operation
The 918SB may be used anywhere that a single set of dry contacts are available. The 918SB can be congured
to respond to either Normally Open (default conguration) or Normally Closed contacts. Two possible primary
applications are used as an overll alarm or as an interstitial alarm. These two uses are addressed below.
The 918DB may be used anywhere that up to two set of dry contacts are available. The 918DB can be congured
to respond to either Normally Open (default conguration) or Normally Closed contacts. Two possible primary
applications for each channel are as an overll alarm or as an interstitial alarm. These two uses are addressed below.
The 918QB may be used anywhere that up to four set of dry contacts are available. The 918QB can be congured
to respond to either Normally Open (default conguration) or Normally Closed contacts. Two possible primary
applications for each channel are as an overll alarm or as an interstitial alarm. These two uses are addressed
below.
Use as an Overll Alarm
Use with the Morrison Brothers 918 Clock Gauge or other similar input device.
1. Prior to lling a tank, test for an existing overll condition, the battery level and overall operation of the
Alarm.
a. Press and hold the “Test/Cancel” button for more than 5 seconds while listening to the Audible Alarm
and observing the Beacon, the Channel Alarm Indicator(s) and BATTERY LOW Indicators
(see Figure 1).

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017
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b. If an overll condition already exists when the “Test/Cancel” button is pressed, the Beacon will ash,
the Channel Alarm Indicator(s) will illuminate prior to the sounding of the Audible Alarm associated
with the “Test” mode. (see Figure 1)
c. The 918 Series Alarm indicates the following:
• The BATTERY LOW indicator will ash momentarily at the beginning of the cycle.
• If the Audible Alarm is congured to sound with an alarm condition, it is loud and strong.
• The Channel Alarm indicators will illuminate when the Beacon is not illuminated and the Audible
Alarm is not sounding (if so congured).
• Beacon is illuminated when the Audible Alarm is NOT sounding (if congured to sound when an
alarm event occurs) and the Channel Alarm indicators are not illuminated.
• BATTERY LOW indicator is NOT illuminated after the initial momentary ash.
2. If an overll condition occurs while lling the tank, the Beacon will ash, the Channel Alarm Indicator
(918DB and 918QB) is illuminated and the Audible Alarm will sound (if so congured).
a. The alarm can be acknowledged and silenced by pressing the “Test/Cancel” button on the front of the
Alarm.
b. If the...
i. Autosilence feature is enabled and the alarm is not silenced by the operator, the 918 Series Alarm
will continue in the alarm state for no more than 10 minutes at which point it will silence itself.
ii. Autosilence feature is NOT enabled and the alarm is not silenced by the operator, then the 918
Series Alarm will continue to alarm until the battery can no longer power the device.
Use as an Interstitial Alarm
1. Should the contacts associated with an interstitial switch be activated, the Alarm will immediately go into
an alarm state; it will sound the Audible Alarm (if so congured), ash the Beacon and illuminate the Channel
Alarm Indicator (918DB and 918QB).
2. If the...
a. Autosilence feature is enabled and the alarm is not silenced by the operator, the 918 Series Alarm will
continue in the alarm state for no more than 10 minutes at which point it will silence itself.
b. If the Autosilence feature is NOT enabled and the alarm is not silenced by the operator, then the 918
Series Alarm will continue to alarm until the battery can no longer power the device.
3.To check for an alarm state once the Alarm has silenced itself, press and hold the “Test/Cancel” button for more
than 5 seconds while observing the Beacon and the Channel Alarm Indicators (918DB and 918QB).
a. If there is an interstitial alarm state, the Beacon will ash and the Channel Alarm Indicator(s) (918DB
and 918QB) will illuminate prior to entering “Test Mode.”
b. If there is not an interstitial alarm, then the Beacon will not ash and the Channel Alarm Indicator(s)
(918DB and 918QB) will not illuminate prior to entering the “Test Mode.”
Maintenance
WARNINGS
• Fire Hazard – Death or serious injury could result from spilled liquids.
• You must be trained to install or maintain this alarm. Stop now if you have not been trained.
• Any modication of this unit beyond what is outlined in this instruction will void product warranty.
• For your safety, it is important to follow local, state, federal and/or OSHA rules that apply to working
inside, above, or around the storage tank and piping area. Use all personal protective equipment required for
working in the specic environment.
• This device is intended to be used as an auxiliary warning to the operator of an abnormal condition of
the system, such as a possible overll situation and should not be the only system in place to prevent an
unwanted condition, such as preventing a tank from overlling. It is the sole responsibility of the operator to
continuously prevent any spillage regardless of the situation.
• Tanks could be under pressure. Vapors could be expelled from tank vents, piping, valves or ttings while
performing maintenance. Vapors could catch re or cause an explosion. Avoid sparks, open ame, or hot
tools when working on tank system.
• Use a dampened cloth when cleaning the alarm enclosure to prevent static buildup and discharge.
• The only battery approved for use with the 918 Series Alarm is the Morrison Bros. Co. battery pack part
number 918SB--0128 2B.
• In the event of malfunction, contact Morrison Bros. Customer Service.

9
Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017
!AVERTISSEMENTS
• Risque d’incendie – Un déversement de liquide pourrait entraîner des blessures graves ou la mort.
• Vous devez avoir reçu une formation pour installer cette alarme ou en assurer la maintenance. Arrêtez-vous
immédiatement si vous n’avez reçu aucune formation à cet effet.
• Toutes les modications apportées à cette unité autres que celles indiquées dans ces directives engendreront
l’annulation de la garantie du produit.
• Pour assurer votre sécurité, il est important de vous conformer à la réglementation locale, d’État, fédérale
ou OSHA régissant les travaux à l’intérieur, au-dessus ou autour du réservoir de stockage et de la zone de
canalisation. Utilisez tout l’équipement de protection individuelle exigé pour travailler dans l’environnement
spéci que.
• Cet appareil est destiné à être utilisé comme mécanisme avertissant l’opérateur d’un état anormal du système
tel une situation de remplissage excessif et ne devrait pas être le seul système en place pour empêcher un état
indésirable, par exemple, un réservoir qui se remplit trop. L’opérateur a l’entière responsabilité de s’assurer
continuellement de prévenir tout déversement, quelle que soit la situation.
• Les réservoirs pourraient être sous pression. Des vapeurs pourraient être expulsées des conduits d’aération,
des canalisations, des soupapes ou des raccords du réservoir durant la maintenance. Les vapeurs pourraient
s’en ammer ou engendrer une explosion. Évitez les étincelles, les  ammes nues ou les outils chauds lors de
travaux menés dans le système du réservoir.
• Utilisez un linge humide pour nettoyer l’enceinte de l’alarme a n de prévenir l’accumulation d’électricité
statique et les décharges.
• La seule pile approuvée aux  ns d’utilisation avec l’alarme de série 918 est le bloc-piles de Morrison Bros.
Co. (pièce #918SB-0128 2B).
• En cas de défaillance, communiquez avec le service à la clientèle de Morrison Bros.
There are two scheduled maintenance operations:
• MONTHLY: Test the battery level and overall operation of the Alarm (see 2 below)
• YEARLY: Check the Enclosure for water ingress (see 3 below)
Battery replacement instructions are in 4 below.
1. If necessary, clean the Alarm Box with a damp cloth.
2. Test the battery level and overall operation of the Alarm no less than once per month.
a. Press and hold the “Test/Cancel” button for more than 5 seconds while listening to the audible alarm
and observing the Beacon and the Channel Alarm and BATTERY LOW indicators.
b. The 918 Series Alarm indicates the following:
• The BATTERY LOW indicator will ash momentarily at the beginning of the cycle.
• If the Audible Alarm is congured to sound with an alarm condition, it is loud and strong.
• The Channel Alarm indicators will illuminate when the Beacon is not illuminated and the Audible
Alarm is not sounding (if so congured).
• Beacon is illuminated when the Audible Alarm is NOT sounding (if congured to sound when an
alarm event occurs) and the Channel Alarm indicators are not illuminated.
• BATTERY LOW indicator is NOT illuminated after the initial momentary ash.
c. If alarm does not sound or the BATTERY LOW indicator illuminates, replace the 918 Series Alarm
Battery Assembly (see instructions in 4 below). If the alarm still does not sound replace the Alarm Box
or call Morrison Bros. Co Customer Service.
d. Inspect the warning tag located near the tank ll or off-loading area. If the tag is damaged or difcult to
read, contact Morrison Bros. at [phone] for a free replacement tag.
3. Check the Enclosure for water ingress no less than once per year.
a. Carefully open the 918 Series Alarm enclosure by loosening the Phillips head fasteners at the four
corners of the cover.
b. Inspect the interior of enclosure to determine if any water has inltrated the enclosure. If water has
inltrated the enclosure, take corrective action to seal the points of ingress.
c. Inspect the electronics for corrosion. If there is corrosion present on the electronic assembly(ies)
• Take corrective action to seal the enclosure from further water ingress.
• Contact Morrison Bros. Co. for further action.

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d. Reattach the front cover of the Alarm using the Phillips head fasteners at the four corners of the cover.
DO NOT OVERTIGHTEN. “Snug” the fasteners in place and verify that the cover is fully seated to the
enclosure base.
e. Perform step 2 above to verify the battery level and overall operation of the Alarm.
4. If the “BATTERY LOW” indicator illuminates at any time, replace the internal battery by performing the
following steps:
CAUTION: The following steps should be followed being sure that there is no possibility of uid ingress
into the alarm enclosure.
ATTENTION: Les étapes ci-dessous doivent être suivies avec l’assurance qu’il n’y a aucune possibilité
d’entrée de  uide dans l’enceinte de l’alarme.
Steps
a. Carefully open the 918 Series Alarm enclosure by loosening the Phillips head fasteners at the four
corners of the cover.
b. Turn off the power switch, SW5 (see Figure 1).
c. Disconnect input device(s) from the Alarm Circuit Board by unplugging the channel connectors from
the Alarm Circuit Board.
d. Disconnect the battery cable from the Alarm Circuit Board (J7). Gently depress the retaining tab of the
connector and pull the connector free (see Figure 6).
e. Remove and retain the two screws holding the battery assembly to the rear cover and remove the
battery assembly from the Alarm (see Figure 6).
Figure 6 Disconnecting the Battery from the Control Board
Retaining
Tab Depress Retaining
Tab and pull gently
Figure 7 Removing/Replacing the Battery Assembly
f. Install and secure the new battery assembly into the rear cover using the two screws retained in the
previous step.
g. Connect the new Battery Assembly to the Alarm Circuit Board’s J7 being sure to fully seat the
connector. Gently tug on the cable to ensure the retaining tab has clicked into place.
h. Turn on the power switch, SW5 (see Figure 1).
NOTE: If the 918 Series Alarm has been congured to operate with Normally Closed Contacts, the
Alarm should go into the alarm state when the power switch is turned on; silence this by pressing
the “Test/Cancel” button.
i. Test the Alarm by pressing and holding the “Test/Cancel” button for more than 5 seconds while listening
to the audible alarm and observing the Beacon and the Channel Alarm and BATTERY LOW indicators
(see Figure 1).

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017
!
!
j. The 918 Series Alarm indicates the following:
• The BATTERY LOW indicator will ash momentarily at the beginning of the cycle.
• If the Audible Alarm is congured to sound with an alarm condition, it is loud and strong.
• The Channel Alarm indicators will illuminate when the Beacon is not illuminated and the Audible
Alarm is not sounding (if so congured).
• Beacon is illuminated when the Audible Alarm is NOT sounding (if congured to sound when an
alarm event occurs) and the Channel Alarm indicators are not illuminated.
• BATTERY LOW indicator is NOT illuminated after the initial momentary ash.
k. If alarm does not sound, the Beacon does not ash, the Channel Alarm Indicators (918DB and 918QB)
does not illuminate or the BATTERY LOW indicator illuminates, replace the Alarm Box or call
Morrison Bros. Co. Customer Service.
l. Connect the input device to the Alarm Circuit Board. Connect input device to the Channel Input
Connector (see Figure 2).
m. Reattach the front cover of the Alarm using the Phillips head fasteners at the four corners of the cover.
DO NOT OVERTIGHTEN. “Snug” the fasteners in place and verify that the cover is fully seated to
the enclosure base.
n. It is recommended to simulate an alarm condition and manually trigger the alarm using input device
(Clock Gauge, oat switch or other dry contact device). If it does not, check wiring at junction box and
verify that the installation procedure was performed correctly. The alarm can be silenced after being
activated by pressing the Test/Cancel button.
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, re, 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.

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918SB‑0134 PP rev 8‑3‑2017