ENVIRONMENTAL CHARACTERISTICS

5.1 Sound pressure level and sensitivity shall not change by more than 15dB in temperature range of -20°C to 60°C, at a relative humidity of 30%.
5.2 Sound pressure level and sensitivity shall not change by more than 6dB in the humidity of 10% to 90%, at the temperature of 25°.
5.3 MOISTURE
Keep the sensor at 40°C±2°C and 90°C to 95°C R.H for 96±4 hours. Then, release the sensor into the room conditions for 24 hour prior to the measurement. It shall fulfill the specifications in Table 1.
5.4 VIBRATION
Subject the sensor to the vibration for 1 hour each in the X.Y and Z axes with the amplitude of 1.5mm at 10 to 55 Hz. It shall fulfill the specifications in Table 1.
5.5 HIGH TEMPERATURE EXPOSURE
Subject the sensor to 80±5°C for 24±1 hours. then, release the sensor into the room conditions
for 1 hour prior to the measurement. It shall meet the specifications in Table 1.
5.6 LOW TEMPERATURE EXPOSURE
Subject the sensor to -30±5°C for 24±1 hours. Then release the sensor into the room conditions
for 1 hour prior to the measurement. It shall meet the specifications in Table 1.

Table 1

NOTES

This sensor is designed for use in air. Do not use this sensor in fluid.
In case where this sensor is to be hold in housing, use soft buffer between sensor and housing. The front part of this sensor vibrates in large.
If this part is hold, its characteristics will vary. The top must be free to vibrate.
To prevent sensor malfunctions, operational failure or any deterioration of its characteristics, do not use this sensor in the following, or similar conditions.

A. In strong shock or vibration.
B. In high temperature and humidity for a long time.
C. In corrosive gases or sea breeze.
D. In an atmosphere of organic solvents.
E. In dirty and dusty environments that may contaminate the sensor front.