GRAS 147AX CCP Rugged Pressure Microphone

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GRAS 147AX CCP Rugged Pressure Measurement Microphone

Enquiry Item

147AX is a rugged surface-mounted pressure microphone optimized for engine compartment testing in the automotive industry. It combines the high precision and stability of a laboratory microphone with a high level of ruggedness, including the ability to function properly in the most challenging environment with vibrations, oil mists, water spray and dirt and dust - and high temperatures up to 125°C.


Freq range: 3.15 Hz to 20 kHz
Dyn range: 19 dB(A) to 133 dB
Sensitivity: 45 mV/Pa 
Temperature: -40 to +125°C
Humidity: 0 – 90%


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Product Overview

The 147AX is optimized to withstand challenging conditions found in an engine bay. It provides easy and repeatable mounting for highly accurate and fast measurement results. With its laboratory precision, extreme ruggedness to match the hot and harsh conditions in an engine bay, as well as a novel form factor and mounting system, the 147AX microphone (patent pending), is destined to become the preferred solution for testing facilities around the world. 

Product Features

  • Robust Design

Accurate data even during rough testing, e.g. on proving grounds or public roads.


  • Power-on Indicator

Visual confirmation of status and transducer electronic data sheet (TEDS) reading during power-up ensures efficiency and readiness for data collection.


  • Small Form Factor

Can be used in small or difficult-to-access spaces where conventional free-field microphones must give up.


  • Online Calibration Data

Calibration data for each specific microphone can be assessed at


  • Water, Oil and Dust-resistant and Replaceable Grid

Can be used in contaminated environments - filter replacement is easy.


  • Temperature Resistant

Can be mounted close to heat sources.


  • Waterproof Design

Microphone-preamplifier housing, including the connection, is certified watertight according to IP67.


  • Robust Cabling

Strain-relieved and waterproof connection ensures data integrity and survivability during outdoor tests. The cable is user replaceable.


  • Protected Venting

Wet or moist conditions will not interfere with your measurements.