Deploying with the external battery housing
The external battery housing has two cable tie slots, bottom and top. Cable ties should be threaded
through the associated holes so they cannot slip off. When using an external battery housing the
weight of the complete system in water is approximately 1.5 kg. It is important to ensure that the
battery and recorder are secured to the line such that there is minimal stress on the power cable.
See the image alongside as an example.
3.9 Housing maintenance
SoundTrap ST200 & ST300 series recorders come in two housing types – standard and deep with 500
and 1000m depth rating respectively. Both types of housing are filled with mineral oil in order to
achieve their depth rating. You will notice an air bubble visible through the transparent window,
which over time will tend to grow in size.
Standard housing (500m rated)
Most ST300 recorders are of this type. For this housing topping up is only necessary when deploying
deeper than 200m. If the air bubble becomes larger than approximately 12 mm diameter and you
intend to deploy beyond 100m then you should top it up.
Deep Housing (1000m rated)
This housing is recognisable by the soft rubber diaphragm around it’s middle section. Most ST200
series recorders are of this type. When using these housings at any depth it is important to check
that the mineral oil is topped up. If the air bubble is larger than approximately 12 mm diameter, the
oil must be topped up.
Topping up procedure
Topping up is done via the filler port screw, located next to the wet plug socket. This is best achieved
using a syringe and large gauge needle (16 gauge works well). The oil should be a good quality
mineral oil, as commonly available from drug stores. Feel free to send us an email if you are unsure.
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