32
PASSIVE DEPLOYMENT CONSIDERATIONS
WEATHERPROOFING
The Chorus is designed as a weatherproof recorder, which means the recorder can be left in
the field during rain, sunshine and snow without any additional weatherproofing. However , if
the device is left in the rain, please consider the following advice:
1.
The recorder is only weatherproof when the case is closed; do not open the case in
the rain. Be careful not to get dirt or other contamination in the rubber seal around
case, as this can allow the ingress of water into the recorder.
2.
Mount the recorder so the microphone/s are pointing horizontally to prevent water
droplets hitting the microphone element. Such water droplets generate large amounts
of noise and can block ultrasound signals from reaching the micro phone until they dry
out. This needs to be considered when you are analysing your data. Sensitivity can be
reduced by inclement weather.
Do not let heavy rain land directly onto the face
of the ultrasonic microphone.
The impact force of the raindrops can permanently
damage the sensitive element, reducing its sensitivity.
3.
If recording is required during rain the microphone should be mounted in such a way
so that water cannot land on the microphone element.
4.
Dry off the case and microphone before opening the recorder or removing the
microphones. This prevents moisture from entering the recorder.
5.
The recorder should not be partially or fully submerged in water.
6.
Desiccant sachets can be added inside the case to prevent condensation, these will
need to be periodically replaced or dried in an oven.
The recorder operates in a wide range of temperatures, however the batteries you use will
have temperature limits; these should be considered. Most Alkaline and Lithium batteries are
recommended for use between -18
o
C to 55
o
C; and -20
o
C to 60
o
C respectively. Please note that
in cold temperatures battery capacity (and therefore recorder run time) will be reduced. The
capacity of alkaline batteries is significantly reduced in cold conditions and in these
circumstances, it is recommended to use 1.5V lithium batteries instead. Also be aware that if
your recorder is left in direct sunlight, especially inside a vehicle, the t emperature inside the
case may be much higher than ambient temperature
and can potentially damage batteries,
causing them to leak.
Summary of Contents for CHORUS
Page 1: ...CHORUS User Manual Version 1 0 ...
Page 7: ...7 EXTERNAL FEATURES ...
