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Hl
1
LO1
fil5
LO5
i
Hi
6
EX1
7.5
107
TEMPERATURE PROBE
lnstruction
11
is designed to excite
and measure
the
CampbQll
Scientific
107
Thermistor Probe
(or
the
ther(ristor portion of lhe
207
temperature
and relative
thumidity
probe) and convert the
measurement into temperature
(oC).
In
this
example,
thf
temperatures are obtained from
three 107 p4obes. The measurements are made
on single-erlded
channels 1-3, and the
temperaturqs are
stored in input locations
1-3.
CONNECTIONS
The black lqads from the probes go to excitation
channel
1,
tfre
white leads go to ground, and the
red leads gq
to single- ended channels
1,
2, and
MEASUREMENT PROGRAMMING EXAMPLES
3 (high and low sides of differentialchannel
1
and high side
of
2).
P11
3
PROGRAM
Temp 107 Probe
Reps
lN Chan
Excite
all reps w/EXchan
1
Loc [:TEMP
#1
]
Mult
Offset
7.6
207
TEMPERATURE AND RH PROBE
Instruction
12
excites and measures
the
RH
portion
of
the Campbell Scientific 207
Temperature
and Relative Humidity Probe. This
instruction relies on
a previously measured
temperatu
re
for
temperature compensation
when
computing
RH.
ln
this example, three
probes
are
measured.
Instruction 11 is used
to
obtain the temperatures
of
the three probes
which are stored in input
locations
1-3;
the
RH
values are
stored in input locations
4-6.
The
temperature measurements are made on single-
ended input
channels
1-3,
just as in Example
7.5.
The program listed below
is a
continuation
of
the program given in Example
7.5.
CONNECTIONS
The black leads from the probes are connected
to excitation
channel
1;
the
clear leads are
connected
to
ground. The
red leads are from
the
thermistor circuit and are connected to
single- ended
channels
1-3.
The
white leads are
from
the
RH
circuit and are connected
to single-
ended channels
4-6.
The
correct order must be
maintained when connecting
the red and white
leads; i.e.,
the red lead from the first probe
is
connected
to single-ended channel
1
and
the
white lead from that probe
is
connected
to
single-ended
channel 4, etc.
PROGRAM
RH
207 Probe
Reps
lN Chan
Excite
all reps w/EXchan
1
Temperature Loc TEMP
#1
Loc [:RH
#1
]
Mult
Offset
sEcTloN
7.
COPPER
CONSTANTAN
FIGURE
7.4f1. Thermocouples with External
Reference
Junction
The
temper{ture of the 107 Probe is stored
in
input
locatiof
1
and the thermocouple
temperatureF in Locations 2-6.
PROGRAM
01:
01:
02:
03:
04:
05:
06:
01:
01:
02:
03:
o4:-
05:
06:
02:
01:
02:
03:
04:
05:
06:
07:
08:
P1
1
P1
1l
1l
11
1
1l
;l
4
5
2
1
1
1l
4
1l
0
Temp 107 Probe
Rep
lN Chan
Excite
all reps w/EXchan
1
Loc [:REF TEMP ]
Mult
Offset
Thermocouple Temp (DIFF)
Reps
15 mV
slow Range
lN Chan
Type
T (Copper-Constantan)
Ref
Temp Loc REF TEMP
Loc [:TC TEMP#1]
Mult
Offset
02:
P12
01:
3
02:
4
03:
1
04:
1
05:
4
06:
1
07:
0
7-3
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