T-Node FR Temperature Sensor

The NexSens T-Node FR Temperature Sensor provides high precision measurements in a connectorized and addressable architecture for water quality profiling.

Features

Titanium Thermistor

Each node features an integral titanium thermistor secured and epoxied in a protective housing for underwater deployments.

Titanium Thermistor

Each node features an integral titanium thermistor secured and epoxied in a protective housing for underwater deployments.

Marine-Grade Cable

Nodes are connected in-series using marine-grade cables with braided Kevlar core and double O-ring seals. Cables are available in increments from 0.5m to 50m.

Marine-Grade Cable

Nodes are connected in-series using marine-grade cables with braided Kevlar core and double O-ring seals. Cables are available in increments from 0.5m to 50m.

High Accuracy

Each sensor is accurate to +/-0.075 C. The exposed titanium thermistor makes direct contact with water, allowing readings to stabilize within 60 seconds.

High Accuracy

Each sensor is accurate to +/-0.075 C. The exposed titanium thermistor makes direct contact with water, allowing readings to stabilize within 60 seconds.

Data Output

Temperature data is transmitted on a RS-485 Modbus RTU string bus for integration with data loggers and SCADA systems.

Data Output

Temperature data is transmitted on a RS-485 Modbus RTU string bus for integration with data loggers and SCADA systems.

Expandable

Optional accessories include water quality sensors, pressure sensors, signal splitters, cable clamps, mooring line, and communication adapters.

Expandable

Optional accessories include water quality sensors, pressure sensors, signal splitters, cable clamps, mooring line, and communication adapters.

Tech Specs

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.)

See Full Specs

Maximum Depth: 200m (656 ft.)
Communications: RS-485 Modbus RTU
Power Requirement: 4-28 VDC
Current Draw Per Node: 1.65mA active; 1.45mA idle; 0.04mA 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.)

Q&A

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.

Do the sensors log internally?

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

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 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.

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 response time of the thermistors?

The T90 response time is approximately 60 seconds.

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.

What is the temperature range of these sensors?

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

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