Environmental Microphone Type 41AL

The series of G.R.A.S. Environmental Microphones are a new, low-cost alternative to Outdoor Microphones, such as Types 41AM and 41CN.
Outdoor Microphones, with their stainless-steel casings, elaborate sealing systems etc., are for permanent unattended outdoor installations, whereas the series of Type 41AL Environmental Microphones are more for short-term outdoor measurements covering periods from a few days to several weeks*. They  can withstand continuous rain and operate over a wide temperature range.
When the windscreen is removed, the Type 41AL can be calibrated with a pistonphone using the special Pistonphone Adapter Type RA0010. Afterwards, the integrity of the measurement system as a whole can be checked using the optional built-in SysCheck capability.
The Type 41AL fulfils the requirements of IEC 60651 for Type 0 Sound Level Meters and is available in four versions covering measurements at both 0º and 90º incidence.
Available versions:

• Type 41AL-S (community noise)
•  - with externally-polarised microphone and 90º incidence.
• Type 41AL-1 (airport noise)
•  - with externally-polarised microphone and 0º incidence
• Type 41AL-2 (community noise)
•  - with prepolarised microphone and 90º incidence
• Type 41AL-6 (airport noise)
•  - with prepolarised microphone and 0º incidence

Download PDF Data Sheet: pd_41AL_ver_18_05_09.PDF

* With the optional desiccator Unit Type AL0001 fitted.

Related Products:

Type 41AO
Type 41AM
Type 41CN

Adobe Acrobat reader is required for viewing data sheets.

50 mV/Pa (nominal)

20 - 146 dB re. 20µPa

Type 0 for both: IEC 60651 and ANSI S1.4-1983

28 V, 0.7 mA to 120 V, 2.5 mA

±14 V, 0.7 mA to ±60 V, 2.5 mA

200 V

0 V

7-pin LEMO 1B, 3 m cable included

50 mm (1.97'') G 1½'' (ISO 228/1) used with AL0001

See above under available versions