User Manual
4 Hardware
4.1 eosFD Housing
The eosFD housing is machined from acetal plastic, allowing for a durable, water-resistant and
lightweight design. The instrument contains a single CO
2
sensor, an internal data logger and a small
diaphragm pump. The housing incorporates a diffusive membrane, electrical interface ports and
detachable leg mounting points for a stable field deployment.
The eosFD membrane is critical to proper operation of the device. The membrane should always
appear uniform in colour and free from visible defects. It is important to periodically check the
membrane, as use in field conditions may cause it to tear or otherwise become defective, and the
membrane will degrade naturally over time. Membranes should be replaced annually for best results,
though the membrane life-cycle may be shortened by exposure to harsh conditions. If dirty, membranes
can be cleaned using a gentle tool, such as a soft toothbrush, and a squirt bottle of deionized water.
Use the toothbrush lightly to dislodge any stubborn mud / sediment and then the squirt bottle to wash it
off. Avoid using any solvents such as alcohol, as this can damage the probe's water resistance
New eosFDs have
one
12-pin socket. If using an eosFD with
two sockets (one capped and the other uncapped), be mindful
to use the
uncapped
socket
when connecting the eosFD to
power and/or the computer.
The capped socket is for
troubleshooting purposes only and should not be used.
4.2 Main Power and Data Cable
The eosFD ships with a standard 5 m power and data cable
(SSC), shown in Figure 1, which plugs directly into the uncapped
12-pin socket on the eosFD housing. Power is supplied to the
eosFD via the two pin connector on the opposite end of the SSC.
This connector also has a tab and notch type system to ensure
that the user connects power with the correct polarity. The eosFD
may be powered by supplying regulated 12 VDC to the sensor via
data logger, battery or other power supply device (see section 4.3:
Power Connectors). A longer 10 m cable (SLC) is also available.
Sensor data is stored on the internal data logger, which can be
accessed using the 3-pin data connector on the SSC, combined
with the USB-R232 cable. The eosLink-FD software is used to
collect stored data, as well as change any of the instruments
settings (see Section 6: Using eosLink-FD).
Figure 1
SCC Power and Data cable
9
m
© Eosense Inc.