7
Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918S‑‑1130 PP rev 12‑21‑2020
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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 illuminate its Channel Alarm Indicator(s) and sound (if so configured) 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 illuminate its Channel Alarm Indicator(s) and sound (if so
configured) 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, float
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 filling or unloading
the tank that is fitted 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, 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.
Operation
The 918S may be used anywhere that a single set of dry contacts are available. The 918S can be configured to
respond to either Normally Open (default configuration) or Normally Closed contacts. Two possible primary
applications are used as an overfill alarm or as an interstitial alarm. These two uses are addressed below.
The 918D may be used anywhere that up to two set of dry contacts are available. The 918D 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. These two uses are addressed
below.
The 918Q may be used anywhere that up to four set of dry contacts are available. The 918Q 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. These two uses are addressed
below.
Use as an Overfill Alarm
Use with the Morrison Brothers 918 Clock Gauge or other similar input device.
1. Prior to filling a tank, test for an existing overfill condition, the battery level and overall operation of the
Alarm.
a.
Press and hold the “Test/Cancel” button until the alarm sounds at least three times while observing the
Channel Alarm Indicator(s) and BATTERY LOW Indicators (see Figure 1).
