Cirrus research CR:920-NA Quantum Outdoor - Cloud-Based Noise Monitoring (Class 1/ Class 2 Group X; 20 ~ 140dB RMS)

Applicable standards

Class 1 or Class 2 Group X

Type 1 I or Type 2 I

ANSI S1.4 -1983 (R2006)

ANSI S1.43 - 1997 (R2007) 

1:1 octave band filters: Class 1 or Class 2

1:3 octave band filters: Class 1 or Class 2

Microphone: ½" MK:224 pre-polarised free-field electret

Microphone preamplifier: MV:920

Measurement range: 20 to 140dB RMS in a single range

Noise floor: <19dB(A) Class 1

Frequency weightings:

RMS: A, C, & Z measured simultaneously

Peak: A, C, & Z measured simultaneously

1:1 octave bands: 31.5Hz to 16kHz

1:3 octave bands: 6.3Hz to 20kHz

Time weightings: Simultaneous Fast, Slow and Impulse

Measurement control: User-definable scheduled measurements and

user-selectable 5min, 15min, 30min, 1hr repeat timers

Time history: User selectable 10ms, 100ms, 500ms, 1 sec

Live data view: 

Noise at work (LAF, LAeq & LCPeak)

Environmental (LAF & LAeq)

Custom (LAeq, LCeq, LAFMax, LASMax,

LCPeak & LZPeak)

Live data rate: 1 sec

Stored values: 

LAeq, LCeq, LZeq, C-A, LAE, LEX8, LAFMax,

LASMax, LCPeak, LZPeak, LAF1, LAF5, LAF10,

LAF50, LAF95, LAF99, LAeqT1 & LAeqT2

1:1 octave bands: 31.5Hz to 16kHz

1:3 octave bands: 6.3Hz to 20kHz

Time history of 1:1 & 1:3 octave bands

Audio quality: 

Standard (16bit/16kHz)

High (24bit/48kHz)

Integrators: User-selectable dual integrators OSHA HC,

OSHA PEL, MSHA HC, MSHA PEL, ACGIH,

Custom A and Custom B)

System Integrity Check (SIC): Three frequency single level charge injection

500Hz, 4kHz and 8kHz

Dimensions: 200 x 850 x 122mm (7.8 x 33.5 x 4.8”)

Weight: 5kg (11 lbs)

Power: PoE IEEE 802.3af-2003 37V – 57V DC 12V – 18V DC 1.5A

Power consumption: <8w

Network connections

4G with 3G fallback factory fitted with

industrial multi-network SIM

Ethernet

Dual-band WiFi (2.4GHz and5GHz)

Bluetooth® 

Temperature: Operating: -10 °C to +50 °C; Storage: -20 °C to +60 °C

Datasheet

Manual