NexSens T-Node FR Thermistor String

The NexSens T-Node FR thermistor string provides high precision temperature measurement in an addressable and connectorized assembly.

Features

  • Build multi-point temperature strings by connecting T-Nodes to underwater cables
  • +/- 0.075 C accuracy for precision temperature measurements
  • Includes sensorBUS for connecting other smart sensors
Your Price $269.00
Usually ships in 3-5 days
NexSens
Free Lifetime Tech SupportFree Lifetime Tech Support
Free Ground ShippingFree Ground Shipping
ImagePart#Product DescriptionPriceStockOrder
NexSens T-Node FR Thermistor StringT-Node FR T-Node FR thermistor string sensor, UW connector
$269.00
Usually ships in 3-5 days
NexSens T-Node FR Thermistor String
T-Node FR
T-Node FR thermistor string sensor, UW connector
Usually ships in 3-5 days
$269.00
ImagePart#Product DescriptionPriceStockOrder
NexSens UW Extension Cables UW-0.5 UW plug to receptacle extension cable, 0.5m
$145.00
Usually ships in 3-5 days
NexSens UW Extension Cables UW-1 UW plug to receptacle extension cable, 1m
$150.00
Usually ships in 3-5 days
NexSens UW Extension Cables UW-1.5 UW plug to receptacle extension cable, 1.5m
$155.00
Usually ships in 3-5 days
NexSens UW Extension Cables UW-2 UW plug to receptacle extension cable, 2m
$160.00
Usually ships in 3-5 days
NexSens UW Extension Cables UW-3 UW plug to receptacle extension cable, 3m
$170.00
Usually ships in 3-5 days
NexSens UW Extension Cables UW-4 UW plug to receptacle extension cable, 4m
$179.00
Usually ships in 3-5 days
NexSens UW Extension Cables UW-5 UW plug to receptacle extension cable, 5m
$189.00
Usually ships in 3-5 days
NexSens UW Extension Cables UW-6 UW plug to receptacle extension cable, 6m
$199.00
Usually ships in 3-5 days
NexSens UW Extension Cables UW-8 UW plug to receptacle extension cable, 8m
$219.00
Usually ships in 3-5 days
NexSens UW Extension Cables UW-10 UW plug to receptacle extension cable, 10m
$238.00
Usually ships in 3-5 days
NexSens UW Sensor Port Plug UW-PLUG UW sensor port plug
$29.00
Usually ships in 3-5 days
NexSens Thermistor String Mooring Clamp Kit TS-Clamp Mooring clamp kit for communication cable & 3/16" vinyl coated SS wire rope, pack of 2
$59.00
Usually ships in 3-5 days
NexSens 3/16" Stainless Steel Mooring Lines SS187-10 Custom built 3/16" vinyl coated SS mooring line, 10'
$60.00
Usually ships in 3-5 days
NexSens 15' Stainless Steel Mooring Line SS187-15 Custom built 3/16" vinyl coated SS mooring line, 15'
$65.00
Usually ships in 3-5 days
NexSens 25' Stainless Steel Mooring Line SS187-25 Custom built 3/16" vinyl coated SS mooring line, 25'
$75.00
Usually ships in 3-5 days
NexSens 50' Stainless Steel Mooring Line SS187-50 Custom built 3/16" vinyl coated SS mooring line, 50'
$100.00
Usually ships in 3-5 days
NexSens 75' Stainless Steel Mooring Line SS187-75 Custom built 3/16" vinyl coated SS mooring line, 75'
$125.00
Usually ships in 3-5 days
NexSens 100' Stainless Steel Mooring Line SS187-100 Custom built 3/16" vinyl coated SS mooring line, 100'
$150.00
Usually ships in 3-5 days
NexSens 125' Stainless Steel Mooring Line SS187-125 Custom built 3/16" vinyl coated SS mooring line, 125'
$175.00
Usually ships in 3-5 days
NexSens 150' Stainless Steel Mooring Line SS187-150 Custom built 3/16" vinyl coated SS mooring line, 150'
$200.00
Usually ships in 3-5 days
NexSens UW Receptacle to Flying Lead Cables UW-FL1R UW receptacle to flying lead cable, 1m
$100.00
Usually ships in 3-5 days
NexSens UW-FL3R Flying Lead Cable Assembly UW-FL3R UW receptacle to flying lead cable, 3m
$120.00
Usually ships in 3-5 days
NexSens UW-FL10R Flying Lead Cable Assembly UW-FL10R UW receptacle to flying lead cable, 10m
$188.00
Usually ships in 3-5 days
NexSens UW-FL20R Flying Lead Cable Assembly UW-FL20R UW receptacle to flying lead cable, 20m
$287.00
Usually ships in 3-5 days
NexSens UW-FL30R Flying Lead Cable Assembly UW-FL30R UW receptacle to flying lead cable, 30m
$385.00
Usually ships in 3-5 days
NexSens RS-485 to RS-232 Adapter RS485-RS232 RS-485 to RS-232 adapter
$129.00
Usually ships in 3-5 days
NexSens RS-485 UW Sensor USB Adapter UW-USB-485R PC interface cable for RS-485 sensors, UW receptacle to USB
$145.00
Usually ships in 3-5 days
UW plug to receptacle extension cable, 0.5m
Usually ships in 3-5 days
$145.00
NexSens UW Extension Cables
UW-1
UW plug to receptacle extension cable, 1m
Usually ships in 3-5 days
$150.00
NexSens UW Extension Cables
UW-1.5
UW plug to receptacle extension cable, 1.5m
Usually ships in 3-5 days
$155.00
NexSens UW Extension Cables
UW-2
UW plug to receptacle extension cable, 2m
Usually ships in 3-5 days
$160.00
NexSens UW Extension Cables
UW-3
UW plug to receptacle extension cable, 3m
Usually ships in 3-5 days
$170.00
NexSens UW Extension Cables
UW-4
UW plug to receptacle extension cable, 4m
Usually ships in 3-5 days
$179.00
NexSens UW Extension Cables
UW-5
UW plug to receptacle extension cable, 5m
Usually ships in 3-5 days
$189.00
NexSens UW Extension Cables
UW-6
UW plug to receptacle extension cable, 6m
Usually ships in 3-5 days
$199.00
NexSens UW Extension Cables
UW-8
UW plug to receptacle extension cable, 8m
Usually ships in 3-5 days
$219.00
NexSens UW Extension Cables
UW-10
UW plug to receptacle extension cable, 10m
Usually ships in 3-5 days
$238.00
UW sensor port plug
Usually ships in 3-5 days
$29.00
Mooring clamp kit for communication cable & 3/16" vinyl coated SS wire rope, pack of 2
Usually ships in 3-5 days
$59.00
Custom built 3/16" vinyl coated SS mooring line, 10'
Usually ships in 3-5 days
$60.00
NexSens 15' Stainless Steel Mooring Line
SS187-15
Custom built 3/16" vinyl coated SS mooring line, 15'
Usually ships in 3-5 days
$65.00
NexSens 25' Stainless Steel Mooring Line
SS187-25
Custom built 3/16" vinyl coated SS mooring line, 25'
Usually ships in 3-5 days
$75.00
NexSens 50' Stainless Steel Mooring Line
SS187-50
Custom built 3/16" vinyl coated SS mooring line, 50'
Usually ships in 3-5 days
$100.00
NexSens 75' Stainless Steel Mooring Line
SS187-75
Custom built 3/16" vinyl coated SS mooring line, 75'
Usually ships in 3-5 days
$125.00
NexSens 100' Stainless Steel Mooring Line
SS187-100
Custom built 3/16" vinyl coated SS mooring line, 100'
Usually ships in 3-5 days
$150.00
NexSens 125' Stainless Steel Mooring Line
SS187-125
Custom built 3/16" vinyl coated SS mooring line, 125'
Usually ships in 3-5 days
$175.00
NexSens 150' Stainless Steel Mooring Line
SS187-150
Custom built 3/16" vinyl coated SS mooring line, 150'
Usually ships in 3-5 days
$200.00
UW receptacle to flying lead cable, 1m
Usually ships in 3-5 days
$100.00
NexSens UW-FL3R Flying Lead Cable Assembly
UW-FL3R
UW receptacle to flying lead cable, 3m
Usually ships in 3-5 days
$120.00
NexSens UW-FL10R Flying Lead Cable Assembly
UW-FL10R
UW receptacle to flying lead cable, 10m
Usually ships in 3-5 days
$188.00
NexSens UW-FL20R Flying Lead Cable Assembly
UW-FL20R
UW receptacle to flying lead cable, 20m
Usually ships in 3-5 days
$287.00
NexSens UW-FL30R Flying Lead Cable Assembly
UW-FL30R
UW receptacle to flying lead cable, 30m
Usually ships in 3-5 days
$385.00
RS-485 to RS-232 adapter
Usually ships in 3-5 days
$129.00
PC interface cable for RS-485 sensors, UW receptacle to USB
Usually ships in 3-5 days
$145.00

The NexSens T-Node FR Thermistor String provides high accuracy temperature data in a connectorized and addressable architecture for water quality profiling. Each node features an integral titanium thermistor secured and epoxied in a protective housing for underwater deployments. The nodes are connected in-series using marine-grade UW Cables with braided Kevlar core and double O-ring seals.

Each T-Node FR 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 a 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.

Mating UW Cables are available in lengths from 0.5m to 50m with a maximum 1,219 meters (4,000 feet) or 250 nodes. Strings terminate in a NexSens UW plug and receptacle connector, allowing additional sections or sensors to be added as required. Optional accessories include water quality sensors, pressure sensors, signal splitters, cable clamps, stainless steel mooring line, and communication adapters.

  • 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
  • Connection Seal: Double o-ring, gland and face seal
  • Connector: 8 pin, sensorBUS
  • Dimensions: 13.46cm L x 3.56cm Dia. (5.3" L x 1.4" Dia.)
Questions & Answers
Do the sensors log internally?

No, the sensors must be connected to a data logger that supports RS-485 Modbus RTU.

What is the temperature range of these sensors?

The temperature range is 0 to 45 C (32 to 113 F)

How are these sensors deployed?

The sensors are connected to each other via UW cables of user-defined lengths. The custom string is attached to a mooring line using TS-Clamps.

Can other sensors be deployed with the temperature string?

Yes, using a UW-2W sensor splitter, other SDI-12 and/or RS-485 water quality sensors can be integrated along the sensor string.

What is the response time of the thermistors?

The T90 response time is approximately 60 seconds.

What is depth rating of the sensor and connector?

The depth rating of the T-Node FR sensor and connector is 200 ft.

What is the maximum length I can have?

4000 ft or 250 nodes (sensors) is the maximum length of a T-Node FR thermistor chain. Please note that the maximum depth of the sensors is 200 ft.

How often should I calibrate my T-Node FR?

Although T-Node FR sensors are capable of holding the initial factory calibration indefinitely, NexSens recommends that temperature strings be sent in for a factory recalibration every three years to ensure maximum sensor performance.

What is RS-485 Modbus RTU?

RS-485 Modbus RTU is a digital communications protocol in which the sensor outputs data. Standardizing how the data is sent from the sensor makes the integration into a data logger or PLC much more straightforward. RS-485 Modbus RTU is an addressable protocol that offers significantly more sensor capacity than other protocols such as SDI-12. This allows the T-Node FR and TS210 temperature strings to accommodate up to 250 sensors along a maximum of 4000 feet of cable. Most data loggers and programmable logic controllers (PLCs) support Modbus.

For what applications is the T-Node FR optimized?

The T-Node FR is used in a variety of applications from water storage tanks to temperature profiling in lakes and reservoirs. In lakes and reservoirs, temperature strings help identify stratification and lake turnover. They are also used in selective withdrawal dams to determine the optimal location to withdraw water. A single temperature node can be used for basic water or ambient air temperature monitoring.

What are common sensors to add onto a T-Node FR string?

Dissolved oxygen sensors are frequently added to thermistor strings to help identify hypoxic zones in lakes. A two-way sensor splitter can replace any temperature node in the string and allow for integration of a third party sensor that outputs data over SDI-12 or RS-485 Modbus RTU.

Please, mind that only logged in users can submit questions

In The News

Climate Change Asymmetry Transforming Food Webs

Recent research from a University of Guelph (U of G) team reveals that warmer temperatures caused by climate change are forcing species to alter their behavior, causing food webs in Ontario lakes to transform. As temperatures warm, larger species hunt new prey in deeper waters, changing the ways nutrients and energy flow in lakes and triggering a “rewiring” of food webs. Dr. Timothy Bartley , study lead author and a post-doctoral researcher in the U of G's Department of Integrative Biology , spoke to EM about the work . “I got started on this when I first began graduate school and joined an ongoing project, which was a collaboration with the Ontario Ministry of Natural Resources and Forestry ,” explains Dr. Bartley.

Read More

Lake Superior Weather Buoy Provides Valuable New Data

A new weather buoy in a remote part of Lake Superior is providing much-needed weather data to local mariners, the National Weather Service and researchers. Scientists from the Superior Watershed Partnership (SWP), Lentic Environmental Services (LES) and the University of Colorado-Boulder recently deployed the buoy on the lake one mile north of Stannard Rock Lighthouse. SWP gained ownership of the lighthouse in 2015. Because the light was built on a large reef in a remote part of the lake, it is one of the most popular trout fishing and charter boat destinations on the Great Lakes. It has also been the location of a NOAA weather station since 1984 and a Great Lakes Evaporation Network monitoring site since 2008.

Read More

Lake Nipissing Algae Blooms: Mixing May Have Role

Sitting between the Ottawa River and Georgian Bay, Lake Nipissing is the third largest lake in Ontario. It’s packed full of islands and has shallow waters that make for numerous sandbars along a winding shoreline. The lake is a popular tourist draw, especially around Callander Bay, where boaters and swimmers come in the summer and anglers fish year-round. Despite that, the nutrients that support algae growth in the bay have been largely unstudied. Researchers at the University of Saskatchewan and Nipissing University are trying to relieve that lack of knowledge with the help of two data buoys. One is deployed in the center of Callander Bay while the other is sitting between the Manitou Islands and the City of North Bay.

Read More