First encounters
3
First encounters
3.1
Handling notes
Although the 40T has a rugged design, it is still a sensitive instrument, and can be
damaged if mishandled. If you are at all unsure about the handling or installation of
the device, you should contact Güralp Systems for assistance.
•
Avoid bumping or jolting the sensor when handling or unpacking.
•
Do not kink or walk on the data cable (especially on rough surfaces such as
gravel), nor allow it to bear the weight of the sensor.
•
Do not connect the instrument to power sources except where instructed.
•
Do not ground any of the signal lines from the sensor.
All parts of the 40T are waterproof.
3.2
Connections
The instrument has a single 26-pin military-specification bayonet connector which
carries both power, control signals and output signals. This is suitable for
connecting directly to a Güralp digitiser.
A breakout box is available which provides separate connectors for signal and
power. An optional hand-held control unit provides individual connectors for every
output signal. These are described in the following sections.
3.2.1
The breakout box
If you are using a Güralp breakout box, it should be attached to the sensor through its
SENSOR
connector. Connectors are also provided at the
CONTROL
and
RECORDER
outputs, for attaching to a hand-held control unit or a Güralp digitiser.
The breakout box also provides a standard Güralp power connector on a 10-pin
bayonet connector. The 40T draws a nominal current of 65 mA from a 12 V supply
(780 mW) when in use; thus, using a 12 V, 25 Ah sealed heavy-duty lead-acid battery,
you should expect the instrument to operate for around a week without recharging.
Holding down both the ENABLE and CENTRE buttons switches the instrument into
one-second mode for as long as they are pressed. This mode allows you to monitor
the mass positions whilst you adjust the offsets manually. If you prefer, you can use
the equivalent switch on a Hand-held Control Unit (see below.)
7
Issue F - June 2019
