NexSens TS210 Temperature String User Guide

Real-Time Water Temperature Measurements

The NexSens TS210 Thermistor String provides high-precision temperature measurements for profiling in lakes, streams and coastal waters. It features an integral titanium thermistor secured and epoxied in a protective housing for underwater deployments. TS210 strings integrate with NexSens X-Series data loggers using the Modbus communication protocol and RS-485 sensor interface. A pre-defined script on NexSens X-Series data loggers is available to detect, log and transmit the temperature data. Parameter data is transmitted, in real-time, at a user-specified interval (e.g., 10 minutes) to the NexSens WQData LIVE web data center. There, data is stored on customizable dashboards with available statistics, graphical interfaces and the ability to download and send data reports via Email, FTP or an API. Below is information on the settings and wiring required to integrate these sensors with a NexSens X-Series data logger.

NexSens TS210 Temperature String product page.

Figure 1: NexSens TS210 Temperature String integration with NexSens X-Series data loggers for real-time water temperature measurements.




Compatible Models

A marine-grade cable with a braided Kevlar core ensures reliability in extreme environments. Each sensor is accurate to +/-0.075°C for high-precision measurements. The exposed titanium thermistor makes direct contact with water, allowing readings to stabilize within 60 seconds. Temperature data is transmitted on an RS-485 Modbus RTU string bus for integration with data loggers and SCADA systems. The string is powered by 4-28 VDC for operation on a 12 or 24 VDC power supply. TS210 strings are available standard with 1m spacing or at custom intervals to meet project requirements. Cable lengths are available up to 1,219 meters (4,000 feet) with a maximum of 250 nodes. Strings terminate in a NexSens UW plug and receptacle connector, allowing additional sections or sensors to be added as required.


NexSens TS210 Thermistor String product page

Figure 2: NexSens TS210 Thermistor String



  • Sensor: Thermistor
  • Range: 0 to 45 C (32 to 113 F)
  • Accuracy: +/-0.075°C
  • Resolution: 0.01°C
  • T90 Response Time: 60 seconds
  • Refresh Rate: 2 seconds
  • Maximum Sensors: 250
  • Maximum Length: 1219m (4000 ft.)
  • Communications: RS-485 Modbus RTU
  • Power Requirement: 4-28 VDC
  • Current Draw Per Node: 1.3mA active; 0.35mA sleep; 0.05mA deep sleep
  • Connector: 8 pin, sensorBUS
  • Dimensions: 7.62cm L x 3.56cm Dia. (3.0″ L x 1.4″ Dia.

Sensor Information

  • Power Requirement: 5-24VDC
  • Protocol: Modbus-RTU
  • Baud Rate: 19200
  • Parity: N81
  • Default Address: 1*
  • Universal Address: 251
  • Format: Big Endian
  • Timeout: 500ms

*On a string with multiple nodes, the nodes will be addressed in increasing numerical order. Use extreme caution when changing the address of a node in a TS210 string to ensure that the nodes remain in numerical order and that the same address is not assigned to more than one node simultaneously.



Third-Party Data Logger Integration

The NexSens UW-Receptacle to Flying Lead cable is an accessory that may be purchased separately for the integration of a TS210 string with a third-party data logger or SCADA system. NexSens X-series data loggers have built-in UW-receptacle ports to accommodate a direct connection of the string. Follow the wiring table below and reference the T-Node FR/TS210 register information to gather readings from the temperature string.

Receptacle PinWire ColorTS210 Signal


NexSens UW-FLxR receptacle to flying lead cable product page.

Figure 3: NexSens UW-FLxR pinout.




Integration with NexSens X-Series Loggers

All T-Node FR/TS210 temperature strings must be addressed in increasing numerical order along the string. Modbus RTU allows the sensors to be addressed from 1 to 256. NexSens X-Series data loggers have a pre-defined script that will program the exact number of nodes on the string and gather temperature measurements at a user-specified interval.

1. Change the Modbus Address in iChart

A single T-Node FR sensor or T-Node FR/TS210 temperature string can be directly connected to a PC using a NexSens RS-485 UW Sensor USB Adapter. This adapter provides the ability to check sensor functionality or adjust the sensor’s Modbus address. Follow the article below to set the addresses for each T-Node FR/TS210 node on the string.

Change the Modbus Address of a TS210 Node


2. Pre-Deployment Check/Setup

It is recommended that field deployments be carefully planned, and it is best to completely configure the system on a lab bench and test it for a period of time prior to taking it to the field. This will ensure a successful deployment and quality data collection. Additionally, it is much easier to troubleshoot problems in the lab than in the field.

TS-Clamp mooring line connection

Temperature strings are frequently attached to a mooring line to keep them fixed in place vertically within a water column. This technique helps to ensure that temperature data is consistently being monitored at the desired depths. With the temperature string laid out on a flat surface, secure each TS210 to the sensor mooring line using TS-Clamp sensor mooring clamps. The TS-Clamp accessory can be used to affix a TS210 thermistor string to a mooring line for deployment.

Cable Armoring

For any TS210 deployment, apply cable armor to all portions of the sensor string that have the potential to wear against irregular surfaces.


3. Automatic Sensor Detection

After setting the node addresses in increasing numerical order and connecting them to the sensor mooring line, the temperature string can be programmed onto the logger via automatic detection.

X-Series Logger Detection and Script Information

The X-Series data loggers include a pre-loaded T-Node FR/TS210 script, which is enabled by default upon shipment. For new data loggers, connecting the string and providing power will force the logger to run through an automatic detection process.

Run a Sensor Detection

For loggers with adjusted settings, use the link below to confirm the script is enabled before running a sensor detection.

Configure Sensor Scripts

Logger Script NumberSensor InterfaceBaud RatePower TypeWarmup Period (sec)Frame
Read Sensor Configuration – Confirm Sensor Detection

After ~5-10 minutes, read the sensor configuration to confirm all nodes on the string and other connected sensors have been detected on the data logger. Thoroughly review the parameter list to ensure all parameters are accounted for and are measured in the desired units. Let the unit gather a few readings to confirm accurate and reasonable parameter data.

Read Sensor Configuration

If a node is not detecting on a NexSens X-Series data logger after following the integration guide, below is a link outlining a few common reasons that should be reviewed.

Why is my temperature string not detecting?


4. Setting up WQData LIVE

Once an X-Series data logger has finished a new sensor detection, it will automatically push the sensor configuration to the WQData LIVE web data center. Follow the three articles below to create a WQData LIVE account, create a new WQData LIVE project and site, and add the data logger to the project.



Real-Time System Application

Real-time water temperature measurements from the NexSens TS210 temperature string are useful in various environmental monitoring applications.

Applicable Systems

Discover applicable uses for NexSens TS210 temperature strings.


Case Studies

Read about specific applications using NexSens TS210 temperature strings.


Water Temperature Measurements

Learn more about water temperature measurements on the NexSens Blog Page.