Seametrics TempHion Water Quality Sensor with Datalogging

Seametrics TempHion Water Quality Sensor with Datalogging is a microprocessor-based submersible sensor with built-in data logging. The internal processor in the TempHion allows for easy calibration, using the calibration utilities in Aqua4Plus. Once calibrated, this calibration data is stored in non-volatile memory within the Smart Sensor. When data is collected, this calibration information is applied to the data, resulting in highly accurate readings at a wide range of temperatures.

The temptation is powered internally with two replaceable AA batteries. Alternately it can be powered with an external auxiliary power supply for data-intensive applications. The unit is programmed using our easy-to-use Aqua4Plus control software. Once programmed the unit will measure and collect data at a variety of time intervals.

Several TempHions, or a combination of TempHions and other Seametrics Smart Sensors, can be networked together and controlled directly from a single computer. While most will use the TempHion 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 telemetry and control systems.

Seametrics TempHion Feature

  • Easy-to-use in-field calibration utilities
  • 316 stainless steel, fluoropolymer, acetal, and PTFE construction
  • Solution ground for excellent noise protection
  • Operates on low power
  • Long-term sensor stability
  • Measures pH, ORP, and temperature
  • RS485 network
  • 200,000+ records stored in non-volatile memory
  • Dual protocol (Modbus® and SDI-12)
  • Narrow 0.75″ diameter, 17.625″ length
  • Available cableless or with a variety of cable options—polyethylene, polyurethane, or FEP
  • Easy export to spreadsheets and databases

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  • Single- or multi-well tracer tests
  • saltwater intrusion tracking
  • Tidal influence studies
  • Wastewater treatment discharge
  • pH monitoring


Housing & Cable Weight 0.8 lb. (0.4 kg)
Body Material Acetal & 316 stainless or titanium
Wire Seal Material Fluoropolymer and PTFE
Cable Submersible: polyurethane, polyethylene, or ETFE (4 lb./100 ft., 1.8 kg/30 m)
Desiccant 1-3 mm indicating silica gel
Field Connector Standard
Temperature Operating Range 0 ̊ to 55 ̊C (32 ̊ to 131 ̊F)
Storage Range Without batteries: -40 ̊ to 80 ̊C (-40 ̊ to 176 ̊F)
Power Internal Battery Two replaceable lithium ‘AA’ batteries – Battery life: 12 months at 15 min. polling interval (may vary do to environmental factors)
Auxiliary 12 Vdc – Nominal, 9-15 Vdc – range
Communication Modbus® RS485 Modbus® RTU, output=32bit IEEE floating point
SDI-12 SDI-12 (ver. 1.3) – ASCII
Logging Memory 4MB – 200,000 records
Logging Types Variable, user-defined, profiled
Logging Rates 2x/sec maximum, no minimum
Baud Rates 9600, 19200, 38400
Software Complimentary Aqua4Plus 2.0
Networking 32 available addresses per junction (Address range: 1 to 255)
File Formats .a4d and .csv (also .xls in Windows 8 and earlier)
Output Channels Temperature
Element 30K ohm thermistor, Epoxy bead/external housing Glass combination electrode Platinum ring Ag/AgCl solid-state electrode (Ion electrode method)
Accuracy ±0.2 ̊C ±0.2 pH units, 0.1% mV value (typical) 0.1 mVH, 0.1% mV value (typical) ±5.0% of measured value (typical)
Resolution 0.1 ̊C 0.01 pH units 0.01 mVH units 0.1 ppm
Units Celsius, Fahrenheit, Kelvin pH, mV Eh, mV ppm, mV
Range 0 ̊ to 55 ̊C (32 ̊ to 131 ̊F) 0-14 pH units / -538 to 260 mV ± 1200 mV 0–10,000 ppm
Compensated 0 ̊ to 40 ̊C (32 ̊ to 104 ̊F) 0 ̊ to 40 ̊C (32 ̊ to 104 ̊F) Isopotential point characterization
Calibration One or two-point calibration w/ pH buffers (4 & 7 or 7 & 10) EH 1 pt. calibration One or two-point calibration w/ ionic strength adjustment
Reference Solution Potassium Nitrate – (KNO3) Potassium Nitrate – (KNO3) Potassium Nitrate – (KNO3)
Reference Ag/AgCl solid-state electrode, capillary liquid junction, TempHion™ reference solution
Maximum Depth pH/ORP: 700 ft (210 m) / 300 psi, ISE: 230 ft (70 m)/100 psi
Environmental IP68, NEMA 6P

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


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