Single-Point Temperature String Assembly

Single-point strings are used to determine water temperature at one location, typically at the surface.

To assemble a single-point temperature string, first connect the male UW plug connector on the T-Node to the female UW receptacle connector on an Underwater Cable.


Underwater connection between T-Node sensor and UW cable

Figure 1: Underwater connection between T-Node sensor and UW cable


Then connect the supplied UW underwater plug to the female UW receptacle connector on the T-Node FR to terminate the string.


Connect underwater plug to female end tnode

Figure 2: Connect underwater plug (also called a “bushing”) to female end of T-Node


Multi-Point Temperature String Assembly

Multi-point strings are used to determine temperature at various locations. Typically of interest are temperature distributions vertically in a water column or horizontally along a stream or riverbed.

During the assembly of a multi-point temperature string, the nodes should be organized by serial number, with the first node being placed at some known reference point (usually closest to the water’s surface for vertical strings). This helps keep the T-Nodes in order in NexSens iChart software, which automatically recognizes and displays temperature string data according to sensor serial numbers, from lowest number to highest. Thus, ordering the T-Nodes by serial number in the field results in the display of an organized temperature profile with no post-deployment programming hassles.

Sometimes the order of the serial numbers must be modified following automatic detection. For example, an additional node may be added to the string at an intermediate depth or a newer replacement node may be needed. In this case, simply select a serial number from the list and click Move Up or Move Down to change the order. The T-Node Sensor Properties window can be accessed when adding the T-Node temperature string in the iChart Setup Device Wizard or by right-clicking the string in the Navigation Panel (if an iChart project file is already setup) and selecting Property.


T-Node Sensor Properties iChart Setup Device Wizard

Figure 3: T-Node Sensor Properties; After clicking Detect, each temperature element in a T-Node string is automatically detected and ordered by serial number in iChart software


To begin assembling a multi-point string, first gather all T-Nodes and Underwater Cables. Set the components out on a clean table or lab bench.

Select a single underwater cable as the first component in the temperature string, and connect it to the UW plug end of the T-node with the lowest serial number.

Continue the assembly with another underwater cable. Attach the plug end of the second cable to the receptacle end of the first T-Node in the string.

Proceed with additional T-Node sensor attachments, each followed by an underwater cable. Be sure to keep track of variations in underwater cable lengths if non-uniform spacing is desired. Also make sure to terminate the string with the supplied UW underwater plug.

Note that all o-rings must be clean and dry before being used to secure watertight connections.



REV: 13H07



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