Seametrics T1 Submersible Temperature Smart Sensor


Offering both SDI12 and Modbus® interfaces, the Seametrics T1/T1Ris a smart choice for upgrading to digital and replacing your analog temperature sensors. The T1/T1R’s rugged construction of 316 stainless steel, fluoropolymer, and PTFE resists weathering and data interferences, making it safe for long-term deployment.

Seametrics T1 Temperature Sensor

The T1 is easy to interface with SDI-12 recorders and can be daisy-chained on one cable up to 200 feet, making it a preferred choice for many environmental professionals with existing SDI-12 systems. The T1R is powered internally with two AA batteries.

Alternately it can be powered with an external auxiliary power supply for data-intensive applications. While most will use the T1R with our free, easy-to-use Aqua4Plus software, it is by no means limited to that software. You can use your own Modbus®RTU or SDI-12 software or logging equipment to read measurements, thus tying into your existing systems and databases

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  • Measures temperature
  • SDI-12 v1.3 and Modbus® RTU
  • Recording (T1R) and non-recording (T1) versions
  • Non-volatile memory (T1R)
  • Small diameter— 0.75” (1.9 cm)
  • 316 stainless, fluoropolymer, and PTFE construction
  • Polyethylene, polyurethane, and ETFE cable options
  • Easy export to spreadsheets and databases (T1R)
  • Wireless connectivity





  • Rugged construction—can replace analog sensors
  • Monitor temperature
    • Groundwater
    • Well
    • Tank
    • Tidal


Housing & CableWeight0.8 lb. (0.4 kg)
Body Material316 stainless
Wire Seal MaterialFluoropolymer and PTFE
CableSubmersible: polyurethane, polyethylene, or ETFE (4 lb./100 ft., 1.8 kg/30 m)
Desiccant1-3 mm indicating silica gel
Field ConnectorT1: Optional, T1R: Standard
TemperatureOperating RangeRecommended: -5 ̊ to 70 ̊C (23 ̊ to 158 ̊F)
Storage RangeWithout batteries: -40 ̊ to 80 ̊C (-40 ̊ to 176 ̊F)
Power (T1)Operating Voltage9-16 Vdc (over-voltage protection: 24 Vdc)
Supply CurrentReading: 3mA, Sleep: 250μA
ProtectionElectromagnetic & transient: IEC-61000 - 4-3, 4-4, 4-5, 4-6
Power (T1R)Internal BatteryTwo lithium ‘AA’ batteries - Expected battery life: 18 months at 15 min. polling interval (may vary do to environmental factors)
Auxiliary12 Vdc - Nominal, 6-16 Vdc - range
CommunicationModbus®RS485 Modbus® RTU, output=32bit IEEE floating point
SDI-12SDI-12 (ver. 1.3) - ASCII
LoggingMemory4MB - 520,000 records
Logging TypesVariable, user-defined, profiled
Logging Rates8x/sec maximum, no minimum
Baud Rates9600, 19200, 38400
SoftwareComplimentary Aqua4Plus 2.0
Networking32 available addresses per junction (Address range: 1 to 255)
File Formats.a4d and .csv
Temperature output
ElementDigital IC onboard
Accuracy±0.2 ̊C
Resolution0.06 ̊C
UnitsCelsius, Fahrenheit, Kelvin
EnvironmentalIP68, NEMA 6P

*Specifications subject to change. Please consult our web site for the most current data. Modbus is a registered trademark of Schneider Electric.