Svantek UK

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.

Microtech Gefell


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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 type Capacitive pressure receiver
Frequency range of the free field transmission factor 3.5 Hz to 20 kHz
Operating transfer coefficient 50 mV / Pa
Operational transmission factor re 1 V / Pa -26 dB ± 1.5 dB
Limit sound pressure level for 3% distortion factor at 1kHz Peak 139 dB
RMS 136 dB
Self-noise 15 dBA
Output impedance <100 ohms
Operating current 2 mA to 20 mA
Open circuit voltage of the power supply unit 24 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 limits rH <100%, condensation not allowed
diameter without protective cap 12.7 mm ± 0.05 mm
with protective cap 13.2 mm ± 0.05 mm
length 97 mm
Weight 45 g
Connectors BNC
Memory for microphone identification 256-bit 1-WireTM EEPROM
Protection class IP 67


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