FHF Explosion-Proof Hooter

• mHP11

– Hazardous zones 1+2

– Polycarbonate housing

– IP 54 protection

– Temperature range -20°C to +70°C

• mHP12

– Hazardous zones 1+2

– Polycarbonate housing

– IP 54 protection

– Temperature range -20°C to +70°C

• mHG11

– Hazardous zones 1+2 and 21+22

– Aluminum housing

– IP 66 protection

– Temperature range -55°C to +70°C

Choosing between mHP and mHG

• mHP11 and mHP12: gas hazardous zones 1 and 2, polycarbonate housing, IP 54, -20°C to +70°C.
• mHG11: gas zones 1 and 2 plus dust zones 21 and 22, aluminium housing, IP 66, -55°C to +70°C; a version with a trumpet (horn) is available.
• Choose the mHG11 where combustible dust is present or outdoors in wet or dusty conditions; where only gas is present and IP 54 is enough, choose the mHP11 or mHP12.

mHG11 certification and data (from the FHF manual)

• Stationary Group II, category 2 equipment: II 2 G Ex e mb IIC T5 Gb / T4 Gb (zones 1 and 2) and II 2 D Ex tb IIIC T90°C Db (dust).
• Sound pressure level about 108 dB(A) at 1 m distance; M20 x 1.5 cable entry.
• Complies with the EMC and low voltage directives (CE mark).

Installation and maintenance

• Mount vertically with the sound opening pointing downward.
• AC versions switch off through a temperature switch on overheating from excessively long continuous operation and restart automatically after cooling; DC versions regulate their energy electronically.
• The unit has no serviceable parts; clean it only with a damp cloth and carry out periodic explosion-protection checks per EN 60079-17. Sound adjustment is for a qualified person, outside the hazardous area.

Information to send for a quote

• The hooter type (mHP11, mHP12 or mHG11), voltage and current type (AC or DC), and quantity.
• The hazardous area: gas or dust zone, ambient temperature; whether a trumpet is needed (mHG11).