Campbell Scientific Bowen Ratio Instrumentation - Manual (Page 14)

Section 2. Station Installation
2-4
FIGURE 2.2-2. TCAV Spatial Averaging Thermocouple Probe
2.3 Wiring
Table 2.3-1 lists the connections to the CR23X for the standard Bowen ratio
sensors measured by the example program. Because the air temperature
measurements are so critical, the air temperature thermocouples are connected
to differential channel 4 (the channel that is closest to the reference
temperature thermistor). The input terminal strip cover for the CR23X must be
installed once all connections have been made and verified (Section 13.4 of
CR23X manual).
TABLE 2.3-1. CR23X/Sensor Connections for Example
Program
CHANNEL SENSOR COLOR
1H Q7.1 RED
1L Q7.1 BLACK
SHIELD CLEAR
2H HYGROMETER PRT GREEN
2L HYGROMETER PRT WHITE
HYGROMETER PRT BLACK
3H TCAV PURPLE
3L TCAV RED
TCAV CLEAR
4H UPPER 0.003 TC - CHROMEL PURPLE
4L LOWER 0.003 TC - CHROMEL PURPLE
40 GAUGE CHROMEL
CONSTANTAN
STAINLESS STEEL
TUBE
HI (PURPLE)
LO (RED)
24 GAUGE
CHROMEL
CONSTANTAN