Fire Extinguishing and Fire Protection
Pressure measurement on rescue equipment
Pressure gauges for respiratory protective equipment (AppBe_F_052)for manufacturers of rescue equipment
Respiratory protective equipment serves as protection for firefighters. Whether for firefighting or operations with hazardous substances, breathing protection is vital. If unprotected, toxic flue gases or other harmful substances could be inhaled, which can inevitably lead to health hazards or even death.
The pressure gauges for respiratory protective equipment have to withstand extreme conditions. Nevertheless, the functionality has to be guaranteed. Therefore, pressure gauges have to meet high demands.
The problem:Pressure gauges serve smoke divers for continuous monitoring of the air supply in breathing air bottles. Here, the instruments are exposed to harsh operating conditions including impacts, high temperatures, vibrations, etc. In an emergency, the pressure gauge must be able to withstand a fall from a height of 1.5 m (4.92 ft.)without affecting the indication accuracy. The device also must be able to withstand temperatures up to 800 °C (1472 °F) in the event of a fire. The instrument has to withstand these extreme conditions and also has to remain readable in the dark.
In addition, the scale also has to indicate the critical range of the residual pressure required to leave the hazardous area.
Our solution:We have the suitable pressure gauge for these requirements. Our instrument has been tested in situations described and can provide exact values, even after a fall or at high temperatures. In addition to that, the instrument has a nonsplintering window and a case with crimpedon ring. The dial was adapted to the required customer specifications. A luminescent dial ensures good readability, even in the dark, and a special scale with red marking indicates the critical range for the user.
Our instrument in detail:Shockproof: Bourdon tube pressure gauge RChg 50 – 3
- Accuracy class 1.6
- Case with polished crimped-on ring, stainless steel 304 (1.4301)
- Degree of protection IP67
- NCS 50 (2")
- Wetted parts stainless steel 316L
- Pressure range 0 − 36 MPa (360 bar)
- Window polycarbonate
- Luminescent dial
- Free of grease and oil
- Vibration-resistant (50 – 60 Hz, amplitude 0.4 mm)
- Impact-resistant from 1.5 m (4.92 ft.) height (with rubber protection cap) on concrete without influence on the indication accuracy
- Resistant against open flame [800 °C (1472 °F), 5 sec]
- Resistant against 200 °C (392 °F) ambience (1 min)
- Durability >10 years
Pressure measurement in fire extinguishing and fire protection technology
Pressure gauges for fire-extinguishing systems in airplanes and helicopters (AppBe_F_053)for manufacturers of fire-extinguishing systems
There are different ways to extinguish fire. An effective method is to cool it down with extinguishing water. However, this method is not suitable for every field of application. Fire-extinguishing systems in airplanes and helicopters have to be designed on the basis of a different method. The removal of oxygen can smother a fire. For this purpose, the gas mixture Inergen is used. In this field of application, pressure gauges also have to meet high demands.
The problem:Space is limited in helicopters and airplanes and fire cannot be extinguished with water, as it would cause great damage. Additionally, flying causes vibrations that can damage the instrument.
In this field of application, extinguishing systems with gas are used. Inergen is a gas mixture (nitrogen, argon, carbon dioxide), which can be applied in closed rooms. One advantage is that, as opposed to pure carbon dioxide, survival in flooded spaces is possible. Furthermore, no residues remain.
Our solution:We have the suitable pressure gauge to ensure monitoring of gas pressure in fire extinguishing tanks.
Our pressure gauge with NCS 40 and a particularly short connecting piece is space-saving and light. We have welded the bayonet ring against unintended release. As a result, it withstands turbulences and thus caused vibrations during the flight.
A helium leak test ensures the tightness of the instrument. Upon customer request we have tested the instrument on other criteria (functionality, pressure) and have issued corresponding certificates.
Our instrument in detail:For fire-extinguishing systems with gas:
Bourdon tube pressure gauge RCh 40 – 3, rm
- Accuracy class 1.6
- Case with bayonet ring, welded
- Nominal case size 40 (1 1⁄2")
- Pressure range 0 − 160 bar
- Connection: ⅛" NPT centre back with shortened connecting piece
- Dual scale 0 − 2,300 psi (black)
- Helium leak detection (10-9 mbar l/s)
- Tests of and certificates on different criteria according to customer request (functionality, leak tightness, pressure test and others)