Instruction manual

50
Appendix B – use of simple heat-pulse controller (no amplifiers)
The heat-pulse controller and probes can be operated with most Campbell
data loggers. The wiring is to be connected as described below:
CR10/21X/23 Controller
+12 Grey (external 12V battery)
G Grey/Black
C1 Blue of controller #1
AG Blue/white “
C2 Blue of controller #2
AG Blue/white “
Probe 1
(1H, 1L) Orange, Orange/white
(2H, 2L) Blue, Blue/white
AG Green
1
AG Shield
Probe 2
(3H, 3L) Orange, Orange/white
(4H, 4L) Blue, Blue/white
AG Green
1
AG Shield
1
VERY IMPORTANT:
If the same battery powers the logger and the heat-pulse unit
then do not connect the green wire of the signal lead to AG. This would cause a ground
loop and might affect the results...
Listing of a CR10 logger programme to connect
;{CR10}
*Table 1 Program
01: 0.2500 Execution Interval (seconds)
1: If time is (P92) ! set for 15 min intervals
1: 0 Minutes (Seconds --) into a
2:
15 Interval (same units as above) ! change as required
3: 11 Set Flag 1 High
2: If Flag/Port (P91)
1: 15 Do if Flag 5 is High
2: 30 Then Do
3: Timer (P26) ! stores the time since heat-pulse
1: 99 Loc [ _________ ]
4: Thermocouple Temp (SE) (P13) ! loc 21..28 = temperature signals
1: 8 Reps
2: 1 2.5 mV Slow Range
3: 1 SE Channel