Model 109B & 109 BAM Temperature Probe
Placement of the cable inside a rugged conduit may be advisable for long cable
runs, especially in locations subject to digging, mowing, traffic, use of power
tools, or lightning strikes.
3.2 Water Temperature
The 109B can be submerged to 200 feet. Please note that the 109B is not
weighted. Therefore, the installer should either add a weighting system or
secure the probe to a fixed or submerged object.
4. Wiring
Connections to Campbell Scientific dataloggers are given in Table 4-1. The
109B Temperature is measured with one Single-Ended input channel and a
Voltage Excitation channel. Multiple probes can be connected to the same
excitation channel (the number of probes per excitation channel is physically
limited by the number of lead wires that can be inserted into a single voltage
excitation terminal, approximately six).
TABLE 4-1. 109B Connections to Campbell Scientific Dataloggers
Colour
Heat Shrink
Label
CR200(X)
CR800
CR3000
CR1000
CR510
CR500
CR10(X)
CR5000
CR23X
Black Volt
Excite
Switched
Voltage
Excitation
(Vx)
Switched
Voltage
Excitation
Switched
Voltage
Excitation
(Vx)
Red Signal
Single-Ended
Input
Single-Ended
Input
Single-Ended
Input
Purple
Signal
Reference
AG
Clear Shield
G
The 109BAM is measured directly by the multiplexer (i.e. AM16/32B) with
the use of the H & L input channels. A 24.9K
Ω
resistor assembly (RES24.9K-
0.1) is required at the datalogger to complete the half bridge measurement at
each of the single ended channels used. Additional information regarding
multiplexer connections can be found in the multiplexer manual.
Table 4-2 shows the wiring for up to three 109BAMs for each of the COM
terminals.
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