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HBK (Brüel & Kjær) · HBK 2255 · Handheld sound level meter

HBK 2255

Current

Single-channel Class 1 sound level meter for consultants and acousticians, with removable preamplifier, TEDS microphone detection and up to three parallel broadband weightings. Functions are enabled by licences covering environmental, occupational and product noise and building acoustics, operated from the instrument or from HBK Partner apps on mobile or PC.

Specifications verified on .

Type
Handheld sound level meter
Class
Class 1
Channels
1
Octave bands
1/1 and 1/3
Connectivity
USB-C, Ethernet over USB, WiFi 2.4 GHz, Bluetooth Low Energy, GPS
Weight
409 g
Battery life
13 h
Compare with other instrumentsAll handheld sound level meters

Specifications

As published by HBK (Brüel & Kjær). Fields the manufacturer does not publish are omitted rather than estimated.

Standards and class — HBK 2255
SpecificationValue
IEC 61672-1 classClass 1
StandardsIEC 61672-1:2013 class 1, IEC 61260-1:2014 class 1, ANSI/ASA S1.4-2014 class 1, ANSI/ASA S1.11-2014 class 1, ANSI S1.43-1997 type 1, IEC 60651 and IEC 60804 type 1, DIN 45657
Pattern approvalsPTB, certificate DE-22-M-PTB-0058, LNE (France)
Measurement — HBK 2255
SpecificationValue
Channels1
Measurement range22.7 to 140.6 dB(A) single range (Type 4966-Z-041); 24 to 141 dB(A) with Type 4952
Linearity range23.2 to 140.3 dB(A) at 1 kHz (IEC 61672); 19.8 to 141.5 dB (IEC 60804)
Peak range43.3 to 143.3 dB (C-weighted peak at 1 kHz)
Frequency weightingsA, B, C, Z
Time weightingsF, S, I
Simultaneous weightingsYes
ParametersLXY, LXeq, LXpeak, LXYmax, LXYmin, LAImax, LXE, LAFTeq, LavS4, LavS5, LAN statistics (five percentiles)
Analysis — HBK 2255
SpecificationValue
Octave bands1/1 and 1/3
Octave band filter classclass 1 (IEC 61260-1:2014), two weightings in parallel
Reverberation timeYes
Building acousticsYes
Audio recordingYes
Logging and data — HBK 2255
SpecificationValue
Shortest logging interval1 ms (advanced logging); 1 s standard
Memory16 GB internal (about 13 GB formatted)
Hardware — HBK 2255
SpecificationValue
Microphone1/2" prepolarised free-field, Type 4966-Z-041, 50 mV/Pa; Outdoor Microphone Type 4952 optional
Detachable preamplifierYes
Outdoor microphone kitOutdoor Microphone Type 4952 with windscreen UA-1700
Weather sensorsYes
Display240 x 320 transflective backlit colour LCD, RGB status light ring
BatteryLithium, 6700 mAh (24 Wh)
Battery life13 h
Weight409 g
Dimensions (mm)281 x 68 x 37 with preamplifier and microphone
IP ratingIP54
Operating temperature (°C)-25 to 70
Connectivity and software — HBK 2255
SpecificationValue
ConnectivityUSB-C, Ethernet over USB, WiFi 2.4 GHz, Bluetooth Low Energy, GPS
Remote controlHBK Partner apps (iOS, Android, Windows); Open Interface BZ-7400; automatic backup to USB or SMB share
SoftwareNoise Partner (BZ-7300), Enviro Noise Partner (BZ-7301), Work Noise Partner (BZ-7302), Product Noise Partner (BZ-7303), Building Acoustics Partner (BZ-7350), Open Interface (BZ-7400), Advanced Logging (BZ-7450), Analysis-quality Audio (BZ-7451)

Variants

Variants of the HBK 2255 as the manufacturer names them
VariantDifference
Hardware and licence bundlessold with Noise Partner, Enviro, Work, Product Noise or Building Acoustics Partner licences, e.g. 2255-B-K02 airborne plus impact kit
WELMEC firmwarelegal-metrology firmware variant for Germany and Spain

Where this data comes from

Manufacturer documents used for this record
KindDocumentAccessed
Product pageHBK 2255 Sound Level Meter
DatasheetProduct Data BP 2679-15, HBK 2255 Sound Level Meter (2024-03)

Verified on . Only the manufacturer’s own published material is used; distributor pages are not sources.

Spec out of date? Tell us (reference hbk-2255).

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Known issues and firmware notes

Hardware and firmware problems reported by owners, with the firmware version concerned and any manufacturer response.

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Feature requests

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