Hardware features Chapter 2
Hydro 2000G/S Page 2-15
from this pipe. The risk depends on the hazardous nature of the dispersants and
samples being measured.
The drain pipe should not exceed 2m in length and should have no loops or kinks.
Dispersant input port
The dispersant input is the inlet port which is connected to a clean source of dis-
persant. A warning triangle warns that the dispersant may be hazardous, though for
most applications it will be water.
Tank fill rate
This adjuster alters an internal pressure regulator that controls the rate at which the
tank is filled with dispersant. This is always set by the installation engineer but if it’s
found that the dispersant pressure has changed (one sign is that the tank takes a
long time to fill), alter this adjuster so that a fill tank cycle takes about six seconds.
“From cell” pipe
This is the sample return port where the sample/dispersant returns to the disper-
sion unit from the flow cell in the optical bench.
“To cell” pipe
This is the sample out port where sample/dispersant leaves the dispersion unit for
the flow cell.
Mains power supply
The mains power supply is a standard IEC socket that supplies mains power to the
dispersion unit. It also houses the dispersion unit’s fuses and its on/off switch.
Accessory comms “in” connector
The communications cable from the optical bench or from another dispersion unit
connects here.
Accessory comms “out” connector
If more than one dispersion unit is connected to the system and this is the first dis-
persion unit in line then a communication cable will be connected from this con-
nector to the accessory comms “in” connector of the second dispersion unit.
The termination plug supplied with the optical bench must be fitted here if this is
the only dispersion unit connected or it is the last dispersion unit in the line.
Auxiliary connector
This is not used.
Manual drain
The manual drain button can be pressed to drain the tank. Users may wish to do
this if, for example, they need to drain the dispersion unit without having to turn
on the control software. Pressing and holding the button will open the drain valve.
Releasing the button will close the drain valve.
MAN0385-1.0 Hydro 2000G-S.book Page 15 Friday, March 16, 2007 4:02 PM
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