Sprinkler Bulbs

Sprinkler Bulbs



A glass sprinkler bulb is the most reliable and economic device used to actuate a fire sprinkler head. The frangible bulb is simple to use, comprising a small thermo bulb made of glass containing a chemical liquid that will expand rapidly when exposed to rising temperatures, bursting the glass fire bulb at an accurately pre-determined temperature, thereby activating the sprinkler.

 

Drawing on more than 50 years' experience in glass bulb technology, Day-Impex offer a bulb for every design of head, and for every fire risk application.

A range of sizes, with diameters from 12mm down to 2.5mm, is available in lengths to suit all sprinkler frame designs, with aesthetically pleasing results.

Extensive research into formulating chemical liquids with known, precise expansion rates, ensures that all bulbs meet specific performance standards required by approval authorities throughout the world.

Precision engineering and exhaustive quality control in every stage of production ensures that the 3 most critical bulb characteristics are achieved.

The entire manufacturing process carries certification to the Quality Standard ISO9001:2008, and most bulbs meet the new European Standard, EN12259. Day-Impex Glass Bulb Type 937 carries LPCB Product Approval in various rated temperatures.

This product may also be referred to as:

  • Frangible Bulbs
  • Glass Sprinkler Bulbs
  • Thermo Bulbs

Day-Impex Glass Bulbs Types 937 and 941 carry UL Component Recognition in various rated temperatures.

The trend to make sprinklers operate faster to suppress fire and restrict spread, has seen Day-Impex develop a progression of new glass bulb designs. Reducing the bulb diameter, but maintaining strength, researching and selecting faster-expanding liquids, has resulted in new bulbs to meet every challenge including the residential and ESFR standards of UL, FM, EUROPE and KOFEIS in Korea.

See the sprinkler bulb in action

Click the below image to see the moment the bulb discharges and water is released through the sprinkler head.

 

 

The Day-Impex
Range of Standard
Glass Bulbs
Bulb Type 826 817 933 937 984 941 942 989
Size (Diameter, mm) 12 8 5 5 4 3 3 2.5
Temperature                
57°C / 135°F Tick Tick Tick Tick Tick Tick Tick Tick
68°C / 155°F Tick Tick Tick Tick Tick Tick Tick Tick
79°C / 175°F Tick Tick Tick Tick   Tick Tick  
93°C / 200°F Tick Tick Tick Tick Tick Tick Tick Tick
141°C / 286°F Tick Tick Tick Tick Tick Tick   Tick
182°C / 360°F Tick Tick Tick Tick   Tick   Tick

Standards

Complies
with
LPS1039

Complies
with
UL199 / FM2000

Complies
with
UL199 / FM2000
Kofeis 0501

EN12259 FM2000.
UL199 & LPS1039
Kofeis 0501


EN12259

EN12259 FM2008. UL199 & Kofeis 0501

Kofeis
0501

EN12259
FM &
UL ESFR
Download Spec Sheet
Bulb Type 826 817 933 937 984 941 942 989