High load breakable glass bulb heat responsive link

Patented mechanical system of fire detection by liquid filled glass bulb breaking. In case of fire, when the temperature reaches the liquid boiling temperature, it causes the explosion of the glass bulb, which releases the mechanism. This self-powered mechanism does  not require  power  supply such as electricity or compressed  air. It i  can open smoke vents, skylights in buildings,  but also actuate fire doors, air conditioning  dampers, store curtains, inflammable gas or liquid valves, range hood exhausts, paint and solvent exhaust fans and dampers, etc.

Maximum permanent load (DaN)

Tensile strength at break (DaN)

Minimum load (DaN)

RTI (m.s^1/2)

Release temperature (°C)

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Description

Applications

Patented mechanical system of fire detection by liquid filled glass bulb breaking. In case of fire, when the temperature reaches the liquid boiling temperature, it causes the explosion of the glass bulb, which releases the mechanism. This self-powered mechanism does  not require  power  supply such as electricity or compressed  air. It can open smoke vents, skylights,  in buildings,  but also actuate fire doors, air conditioning  dampers, store curtains, inflammable gas or liquid valves, range hood exhausts, paint and solvent exhaust fans and dampers, etc.

Dimensions: Small foot print, can replace most of devices using fusible links. In addition, having a very high tensile strength, this device does not require a demultiplying system.

Creep sensitivity: Insensitive to creep, even close to the tripping temperature.

ROHS compliance: For most of temperature calibration, fusible fire detection systems cannot be achieved, as they use alloys containing lead and cadmium, materials that are not allowed by the RoHS standard. This glass bulb operated device does not use fusible alloy and therefore contains no prohibited metal and meets the RoHS standard.

Material: Galvanized steel.

Fail safe operation: When opening, the internal lever falls unhindered by any other part, irreversibly releasing the two halves of the mechanism.

This mechanism has no spring because, due to their susceptibility to corrosion and to permanent deformation, the use of springs may cause a malfunction.

Heat responsive bulbs: Glass, dia. 5mm, 20mm nominal length, filled with alcohols blends. They are protected against hits.

Response time index (RTI) of bare bulbs: 90 m.s^1/2

Maximum  permanent load: 300 DaN

Tensile strength at break: 500 DaN

Minimum load: 10 DaN

Nominal opening temperatures: 57 °C (135 °F) orange bulb; 68 °C (155° F) red; 79 °C (175 °F) yellow; 93 °C (200 °F) green; 141 °C (285 °F) blue; 182 °C (360 °F) mauve. The bulb coloring complies with EN 12259-1 and ISO 6182-1 international standards for color/temperature ratings. Other temperatures, consult us.

Options: Rope thimble assembled on one hole. Caution: this thimble may be distorted by high loads

Mounting position: When used in vertical position, the glass bulb must be downside. No preferential position when mounted horizontally.

Glass bulb replacement: Replacement is possible, by using a locking pin, which must be removed after bulb replacement.

Certifications: according to ISO 10294-4.

Other types: for load <150 DaN, see 58L type

Main references

Accessories and spare parts

 
Rope thimble (DIN6899A) for steel wire ropes dia. 3 to 3.5mm, 300 DaN max. load.

(Packing unit 20p.)

Rope clamp for steel wire ropes dia. 3 to 3.5mm, 300 DaN max. load.

(Packing unit 1Op.)

Wall mounting board, 300 DaN max. load.

(Packing unit lp.)

Safety pin for glass bulb replacement.

(Packing unit 5p.)

Dia. 5 x 20mm glass bulb

(Packing unit 50p. & 500p.)

Zinc plated steel 6658RT034Z Zinc plated steel 6658RC036Z Zinc plated steel 6658RW035Z 6658PG001Z 57°C(135°F) 6658ZGB057
68°C(155°F) 6658ZGB068
79°C(175°F) 6658ZGB079
93°C(200°F) 6658ZGB093
141°C(285°F) 6658ZGB141
182°C(360°F) 6658ZGB182

Replacement of glass bulb (When requested by preventive maintenance rules)

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Glass bulb replacement must be made by trained technicians. Only genuine glass bulbs with the same calibration temperature must be used.

1/ Check the reference printed on the product (58Z or 58L). Secure the link with this pin before and during glass bulb replacement.

2/ Remove the screw with hexagonal key wrench. Size is 2.5mm for 58L, and 1/8 inch, (3.17mm) for 58Z. Remove the old glass bub. 3/ Put carefully a new glass bulb inside (Dia. 5 nun for 58Z or dia. 2nun for the 58L). Put the screw and tighten lightly it by hand. Don’t break the bulb filling needle. If any doubt, unclips the bulb needle cap (A) with a small screw driver, and check visually that the filling needle is not broken. Do not miss to clips again the cap after inspection. 4/ Tighten the screw with a torque controlled wrench. (Torque must be 0.5 to 0.6 N.111. for 58Z, and 0.25 to 0.4N.m for 58L)

Seal the screw thread* with a low strength sealant like Loctite 222. Be carefol to not glue the lever to the frame with excess sealant.

 5/ Important: Don’t miss to remove the safety pin when you have finished.

Downloadable

Datasheet

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Technical informations associated to this product

  • Description of temperature controls

    Used as control thermostats or as a safety thermostat with manual reset, these thermostats have a disc made of two different metals laminated together for temperature sensing element. These two metals have different expansion coefficients.
  • Historical introduction to temperature measurement

    The temperature measurement was preceded by a long period, throughout the 18th century, when first empirically and then gradually more accurately, have been developed measurement scales, were discovered fixed points for the calibration of these scales, and all physical variations related to temperature change: thermal expansion of gases, liquids, metals and other solids, liquefaction temperatures, boiling temperature, magnetism, thermoelectricity, just to give a few.
  • Historical and technical introduction of fusible alloys and fire safety fusible links

    The earliest known piece made of lead and tin alloy seems to be an Egyptian vase found in Abydos, dated around 1400 BC. During the Roman Empire, lead was used for the construction of water pipes. Melting at 325°C,
  • Temperature sensing principles

    The bimetal strip is formed by two co-laminated metal. One has a high coefficient of expansion, the othera lower or zero. When the strip is heated, it bends proportionally to the temperature. These bimetal blades are generally flat and fixed at one end. But they can be wound in a spiral shape, although this arrangement most often used in the construction of thermometers.