Tank Alarm

FIG 918S, 918D, 918Q

The 918 alarm box can be paired with a variety of Morrison 918 clock gauges or level sensors. The alarm provides an audible alarm and visual indication upon the receipt of a signal. Connect a variety of Morrison gauges or sensors to meet your requirements.


918D is a dual channel alarm box- Connect two devices
918Q is a quad channel alarm box- Connect up to four devices

Standard Features 

Visual alarm indicators lights turn red identifying which input channel is alarming

Self-powered by long-life replaceable lithium battery

Monitor up to four sensor signals

User-defined alarm labels

NEMA 4X water-resistant enclosure

Compatible with Morrison 918 clock gauges and 924, 924LS, and 925 level sensors

Can be installed remote from gauge or level sensor

Low battery light turns yellow indicating battery power is low

90 dB audible alarm at 4 feet

Modular contacts make it easy to connect a variety of dry contact simple switch devices

In compliance with UL 913 intrinsic safety standards

Intrinsically safe for Class I, Division 1 and 2, Group D hazardous locations

Internal ON/OFF power switch

ON/OFF switch for audible alarm 

ON/OFF switch for auto-silence mode

Normally open or normally closed selectable by input channel


Construction Details

  • Alarm box: Polycarbonate plastic
  • Battery: Single-cell lithium


Certifications & Listings

cULus 913 Listed; Florida DEP EQ-527; Intrinsically safe for Class I, Division 1 & 2, Group D hazardous locations

Figure Suffix Size Description Weight (lbs)
918S 1100 AA 2" Single channel tank alarm box, use with 918 gauge & 918 TCPS sensors 1.40
918D 1100 AA 2" Dual channel tank alarm box, use with 918 gauge & 918 TCPS sensors 1.40
918Q 1100 AA 2" Quad channel tank alarm box, use with 918 gauge & 918 TCPS sensors 1.40


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