Delta-T Devices PR2, Руководство пользователя

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This diagram shows the connections for Profile Probe sensor 1
connected to channel 1 of a DL2e in differential mode, and
powered through the logger’s internal power supply.
Further details can be found in your Ls2Win installation. The
DL2 Program Editor contains on-line help and an application
note on each sensor type.
Four DL2e sensor codes are supplied for the PR2:
P2M provides a conversion from mVolts to soil water content (in
m
3
.m
-3
) suitable for general mineral soils.
P2O converts to m
3
.m
-3
for general organic soils.
P2C converts to %vol for general mineral soils.
P2D converts to %vol for general organic soils.
Note: All DL2e data in m
3
.m
-3
units is restricted to 0.01 m
3
.m
-3
resolution. The P2C and P2D codes using %vol show much
better resolution, and are preferred.
Power supply
Profile Probes types PR2 require 5.5 to 15 Vdc power. Power
can be applied continuously, or via a warm-up relay for greater
economy of power consumption.
You can power
Profile Probes directly using DL2e internal
batteries. However, if several probes are to be used, or if the
data logger has to supply significant power to other sensors or
accessories, we recommend powering the data logger and
sensors from an external power supply.
The DL2e has two warm-up relay-controlled outputs. Each relay
can typically power up to 12 PR2/4 or 8 PR2/6
Profile Probes.
Note : For best economy the Profile Probe should be powered
up using a 1 second warm-up time.
Link the green
wire to the
minus –
terminal on
every channel
used by the
PR2
Profile Probe User Manual 3.0a Operation z 15