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Measurement Microphone MMS 212

The 1/2 “measuring microphone MMS 212 is very insensitive to extreme temperatures, humidity, dust and vibrations. This is achieved through a special design of the protective cap, pressure compensation opening and connector. The MMS 212 corresponds to protection class IP 67 and can be calibrated with standard 1/2 “sound calibrators. An integrated light element permanently shows the correct function and ensures reliable measurements.


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The MMS 212 1/2“ measurement microphone set is designed for operating in extreme levels of temperature, humidity, dust and vibration. The ability to perform in the harshest of conditions is achieved by a skilful redesign of the protection grid, pressure compensation vent and connector.
Furthermore, quick and reliable measurements are facilitated by an integrated status LED confirms power-on, alerting the user to a sensor or cable failure.

Features include:

• Ruggedised
• LED status light
• IP67 including water-proofed connection
• Unique IEPE/CCP powered, externally polarised capsule
• Microtech Gefell 4010 calibrator recommended

Converter typeCapacitive pressure receiver
Frequency range of the free field transmission factor3.5 Hz to 20 kHz
Operating transfer coefficient50 mV / Pa
Operational transmission factor re 1 V / Pa-26 dB ± 1.5 dB
Limit sound pressure level for 3% distortion factor at 1kHzPeak139 dB
RMS136 dB
Self-noise15 dBA
Output impedance<100 ohms
Operating current2 mA to 20 mA
Open circuit voltage of the power supply unit24 V DC to 30 V DC
Working temperature range-40 ° C to +125 ° C
Storage temperature range-40 ° C to +80 ° C
Temperature coefficient at 250 Hz≥0.01 dB / K
Static pressure coefficient at 250 Hz-0.00001 dB / Pa
Moisture limitsrH <100%, condensation not allowed
diameterwithout protective cap12.7 mm ± 0.05 mm
with protective cap13.2 mm ± 0.05 mm
length97 mm
Weight45 g
Memory for microphone identification256-bit 1-WireTM EEPROM
Protection classIP 67


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