Long lead lengths temperature – Campbell Scientific CS547 Conductivity and Temperature Probe and A547 Interface User Manual
Page 21
CS547 Conductivity and Temperature Probe and A547 Interface
17
Example 2. Sample CR10(X) Instructions Using AC Half Bridge
01: AC Half Bridge (P5)
01:
1
Rep
02:
22**
7.5 mV 60 Hz rejection Range
03:
9*
IN Chan
04:
3*
Excite all reps w/EXchan 3
05:
2000**
mV Excitation
06:
11*
Loc [:Air_Temp ]
07:
800
Mult
08:
0
Offset
02: Polynomial (P55)
01:
1
Rep
02:
11*
X Loc Air_Temp
03:
11*
F(X) Loc [:Air_Temp ]
04:
-53.46
C0
05:
90.807
C1
06:
-83.257
C2
07:
52.283
C3
08:
-16.723
C4
09:
2.211
C5
* Proper entries will vary with program and datalogger channel and input location
assignments.
** On the 21X and CR7 use the 15 mV input range and 4000 mV excitation.
12. Long Lead Lengths Temperature
If the CS547 has lead lengths of more than 300 feet, use the DC Half Bridge
instruction (Instruction 4) with a 2 millisecond delay to measure temperature.
The delay provides a longer settling time before the measurement is made. Do
not use the CS547 with long lead lengths in an electrically noisy environment.
Example 3. Sample Program CR10 Using DC Half Bridge with Delay
01: Excite, Delay,Volt(SE) (P4)
01:
1
Rep
02:
2**
7.5 mV slow range
03:
9*
IN Chan
04:
3*
Excite all reps w/EXchan 3
05:
2
Delay (units .01sec)
06:
2000**
mV Excitation
07:
11*
Loc [:Temp_C ]
08:
.4***
Mult
09:
0
Offset
(cont.)