Back-up Alarms
A back-up beeper also known as back-up alarm, backup beeper, or vehicle motion alarm, is a device intended to warn persons nearby of a vehicle, typically a truck or fork-lifter, moving in reverse. They typically produce 1000 Hz pure tone beeps at 97-112 decibels, way beyond the long term hearing loss limit of 80 decibels.

Thehe area behind Trucks, Buses, Earthmoving Equipment and other Heavy Duty Vehicles is a dangerous place when the vehicle is reversing. GREWUS Back-Up Alarms are designed in order to improve safety. Requirements and specifications vary, so the product line offers different types and technologies in order to meet the expectations of OEM`s and Aftermarket Customers around the world:

  • Piezo or loudspeaker driven alarms, with defined Sound Pressure Level (SPL), voice-talking alarms
  • Budget, premium and heavy duty reverse alerts for applications in different ambient level environments
  • Low, medium and high Sound Pressure Level, self-adjusting SPL, suitable for residential areas
  • A large choice of brackets and fasteners, customized mounting patterns for OEM`s
  • Fully sealed for protection against dust, moisture and vibration (IP protection rating)
Series Specifications  
H = Sirens
U = Back-up alarms Diameter and impedance C = Constant
P = Pulse
H = Horns
B = Front panel buzzer C = Constant
P = Pulse
CP = Constant+Pulse

Our range of Back-up Alarms

HU SERIES BACK-UP ALARMS

HU SERIES BACK-UP ALARMS
The space behind trucks, buses, earthmoving equipment and other heavy duty vehicles is a dangerous place when the vehicle is reversing. GREWUS back-up alarms are designed in order to improve safety. Requirements and specifications vary, so the product line offers different types and technologies in order to meet the expectations of OEM`s and aftermarket customers around the world
  • Piezo or loudspeaker driven alarms, with defined sound pressure level (SPL), voice-talking alarms
  • Budget, premium and heavy duty reverse alerts for applications in different ambient noise level environments
  • Low, medium and high sound pressure level. Self adjusting SPL, suitable for residential areas (87dBA to 118dBA)
  • A large choice of brackets and fasteners. Customized mounting patterns for OEM`s
  • Fully sealed for protection against dust, moisture and vibration
  • Voltage ranges of 4V to 100V DC
  • Different tones: pulse, constant and siren sound

BUS SERIES BACK-UP ALARMS

BUS SERIES BACK-UP ALARMS
Our new back-up alarm series has loudspeaker technology, 2 contact possibilities, low frequency and for any requirement the right SPL version.

NOISE REDUCTION BACK-UP ALARMS

NOISE REDUCTION BACK-UP ALARMSNoises generated in residential areas as a result of trucks and construction vehicles are often considered annoying. Complaints are on the increase about a noise level that is considered to be too high, particularly during off-peak periods. Commercial vehicles are often equipped with a loud acoustic signal device, intended to warn people standing behind the vehicle of danger when the reverse gear is engaged. Such back-up alarms are intended to protect life and limb; yet they are often considered to be annoying and disturbing by persons not affected. As a specialist for a wide range of such acoustic warning devices, GREWUS is offering some really “smart” solutions to this problem.
“FlexSmart” (for example) is an intelligent back-up alarm which automatically adapts its warning sound to the surrounding sound level. The device is adjusted in such a way that the noise level lies 5-10dB above the respective surrounding noise level.
In this way unnecessary noise levels, perceived as too loud in quiet residential areas, are avoided. In spite of this the desired warning effect is still achieved.
Click on product part for data sheet of our Noise Reduction Back-up Alarms Close
  BPI 4024NRM A >> HU 2SPL A >> HU 2SPL Speaker-01 A >>
Operating temperature -20°C to 60°C -20°C to 80°C -20°C to 80°C
Storage temperature -20°C to 60°C -20°C to 80°C -20°C to 80°C
Contact Wire Wire Wire
Weight [g] 52 85 170
SPL [dBA] see remarks (95/78) ±5 96/80 ±3
Rated voltage [V] 24 12 / 24 12 / 24
Operating voltage [V] 18-32 8-30 11-28
Tone Pulse Pulse Pulse
Current consumption [mA] ≤ 200 ≤ 300 ≤ 300
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FRONT PANEL BUZZER

FRONT PANEL BUZZER
There is no specific sound technology related to front panel buzzers. Basically all technologies described above can be used. In most cases a piezo disc will be the sound element. The extra category has been chosen because of the very specific housing for panel mounting..
Click on product part for data sheet of our FRONT PANEL BUZZER Close
  HB 50C-01 B >> HB 4112P A >> HB 28CP100 A >> HB 28CP-01 A >>
Operating temperature -20°C to 70°C -30°C to 60°C -20°C to 75°C -20°C to 75°C
Storage temperature -20°C to 70°C -40°C to 75°C -25°C to 85°C -25°C to 85°C
Contact Terminal Terminal Terminal Terminal
Weight [g] 50 14 40 40
SPL [dBA] 95 ±3 68-80 ±3 95 ±3 85 ±3
Resonant frequency [Hz] 3000 ±500 2900 ±500 2900 ±500 2900 ±500
Rated voltage [V] 36 12 12 12
Operating voltage [V] 2-50 8-31 5-28 5-28
Current consumption [mA] ≤ 20 3-41 ≤ 20 ≤ 20
Tone Constant Constant/Pulse Constant/Pulse Constant/Pulse
  HB 28CP-03 A >> HB 28CP A >> HB 28C-01 B >> HB 228CP A >>
Operating temperature -20°C to 75°C -20°C to 75°C -40°C to 105°C -20°C to 65°C
Storage temperature -25°C to 85°C -25°C to 85°C -40°C to 105°C -30°C to 75°C
Contact Terminal Terminal Terminal Faston
Weight [g] 40 40 40 25
SPL [dBA] 65 ±3 85 ±3 85 ±3 85 ±3
Resonant frequency [Hz] 2900 ±500 2900 ±500 2900 ±500 3000 ±500
Rated voltage [V] 12 12 12 12
Operating voltage [V] 5-28 5-28 5-28 5-28
Current consumption [mA] ≤ 20 max. 20 ≤ 20 ≤ 18
Tone Constant/Pulse Constant/Pulse Constant Constant/Pulse
  HB 228C-01 A >> HB 110C A >>
Operating temperature -20°C to 65°C -25°C to 70°C
Storage temperature -30°C to 75°C -25°C to 80°C
Contact Faston Terminal
Weight [g] 40 40
SPL [dBA] 85 ±3 >82
Resonant frequency [Hz] 3000 ±500 3000 ±500
Rated voltage [V] 12 110
Operating voltage [V] 5-28 88-132
Current consumption [mA] ≤ 18 ≤ 6,5
Tone Constant Constant
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