TempHion Multi-Parameter Water Quality Sensor

  • Multiparameter Water Quality Sensor Temperature, pH, REDOX, Ion Selective Electrode (Chloride, Nitrate or Bromide)
  • SDI12 and modbus outputs Ideal for telemetry or real-time applications
  • Replaceable reference solution For long-term stability
  • <20mm diameter
Product Options


The Aquistar TempHion multiparameter water quality instrument with integrated power and datalogger is capable of measuring pH, specific ions (chloride, bromide, and nitrate), redox and temperature. One thermistor based temperature element comes with each unit, plus up to four pH, ISE, or redox elements.

The TempHion is powered internally by two AA batteries or with an external auxiliary power supply for data intensive applications.

The TempHion water quality sensors can be programmed using a laptop or desktop via it's RS485/RS232 adapter and easy to use Aqua4Plus software.

After programming, the sensor will measure and collect data at a variety of time intervals.

The internal processor allows easy calibration, using the Aqua4Plus calibration utilities. Once calibration is complete, this data is stored in the non-volatile memory within the Smart Sensor. This calibration information is applied to recorded data, resulting in highly accurate readings at a wide range of temperatures.

Other Features

  • Easy to use software
  • Operates on low power
  • Easy calibration
  • Non-volatile memory
  • Easy networking between Smart Sensors

Manufactured by: INW
Model: TempHion Multi-Parameter Water Quality Sensor

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


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


Length 17.625" (44.8 cm)
Diameter 0.75" (1.9 cm)
Weight 0.85 lb. (0.4 kg)
Body Material Delrin® & 316 stainless steel or
Wire Seal Material Viton® and PTFE/FEP
Submersible Cable Polyurethane, polyethylene, or FEP
Protection Rating IP68, NEMA 6P
Terminating Connector Available
Communication RS485 Modbus® RTU
SDI-12 (ver.1.3)
Direct Modbus Read Output 32-bit IEEE floating point
Millivolt Channels No. Available Channels:
2mv, 1 temp
Range: ± 1200mV
Accuracy: 0.1% value
Resolution: 0.1mV
Reference Electrode:
Ag/AgCl solid-state electrode
Patented capillary liquid junction
TempHionTM reference solution
Operating Temp. Range -0° C to 55° C
Storage Temp. Range1 -20° C to 80° C
Maximum Depth 700 ft (210 m) | 300 PSI
Memory 2MB - 200,000 records
Log Types Variable, user-defined,
logarithmic, profiled
Programmable Baud Rate (optional) 9600, 19200, 38400
Logging Rate 2x/sec maximum
Software Complimentary Aqua4Plus or
Networking 32 available addresses per junction w/ batching capabilities (up to 255)
File Formats .xls / .csv / .a4d
Internal Battery 2x1.5V AA alkaline2
Auxiliary Power 12VDC - Nominal
6-15VDC - Range
Exp. Alkaline Battery Life 18 months at 15m polling interval3
Element Type 30K thermistor
Element Material Epoxy bead/external housing
Accuracy ± 0.2° C
Resolution 0.1° C
Range -5° C to 60° C
Units Celsius, Fahrenheit, Kelvin
Sensor Type/Material pH:
Glass combination electrode
Platinum ring
Ranges pH:
0-14 pH units / -538mV to 260mV
± 1200mV
Units pH, mV, Eh
Typical Accuracy pH:
± 0.2 pH units
0.1 mVH
Resolution pH:
0.01 pH units
0.01 mVH units
Compensated Range 0° C to 40° C
Calibration pH:
One or two point calibration w/ pH buffers (7 & 4 or 10)
EH 1 pt. calibration
Referance Solution Potassium Nitrate - (KNO3)
1 Storage without batteries
2 Lithium available upon request
3 May vary due to environmental factors