Water Quality Sensor
Water Quality Sensor
SEN428

    Submersible, high accuracy water quality sensor with integrated data logging to measure pH, ORP and temperature. 

    A submersible, high accuracy water quality sensor using LoRaWAN technology and an integrated data logger to measure pH, ORP (Oxidation Reduction Potential) and temperature. This patented technology most importantly provides long-term stability, ideal for continuous or intermittent remote monitoring.

    Ideal for unattended onsite pH testing as no regular calibration or servicing is required especially when combined with the Long Range Wireless Modbus SEN411/SEN511 device.

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For the most up-to-date information on this product please download the Product Brochure above. 


  • OVERVIEW
  • Detail
  • TECHNICAL

Features, Benefits & Functions

  • Built for accuracy with low levels of ‘noise’  
  • Small 1.9cm diameter to fit most wells  
  • Tough, field ready 316 stainless steel, fluoropolymer, acetal and PTFE construction  
  • Low power requiring just two internal AA batteries  
  • Long-term sensor stability up to 6 months  
  • Measures pH at up to 150PSI
  • No data loss in the event of a power failure storing up to 400,000 records  
  • Flexible Modbus® and SDI-12 interface  
  • Simple export of data to spreadsheets and databases  
  • Bespoke cable lengths available  
  • Easy-to-use on-site calibration capabilities  
  • High accuracy, research grade water quality sensor 

A submersible, high accuracy water quality sensor using LoRaWAN technology and an integrated data logger to measure pH, ORP (Oxidation Reduction Potential) and temperature. This patented technology most importantly provides long-term stability, ideal for continuous or intermittent remote monitoring.

 

Powerful and easy-to-use software allows up to 400,000 accurate records to be collected and, its patented reference electrode, provides long-term stability for continuous or intermittent monitoring.

 

Ideal for unattended onsite pH testing as no regular calibration or servicing is required especially when combined with the Long Range Wireless Modbus SEN411/SEN511 device.

Technical

Length w/batteries17.96” (45.6 cm)
Length w/o batteries14.16” (36.0 cm)
Cableless0.25” (0.6 cm) shorter
Diameter0.75” (1.9 cm)
Weight0.85 lb. (0.4 kg)
Body MaterialAcetal & 316 stainless steel or titanium
Wire Seal MaterialFluoropolymer and PTFE
Submersible CablePolyurethane, polyethylene, or FEP
Protection RatingIP68, NEMA 6P
Desiccant1-3 mm indicating silica gel (high or standard capacity)
Terminating ConnectorAvailable
CommunicationRS485 Modbus® RTU
 SDI-12 (ver.1.3)
Direct Modbus Read Output32-bit IEEE floating point
  
Millivolt Channels 
No. Available Channels2mV, 1 temp
Range± 1200mV
Accuracy0.1% value
Resolution0.1mV
Reference 
ElectrodeAg/AgCl solid-state electrode
JunctionPatented capillary liquid junction
ElectrolyteTempHionTM reference solution
Operating Temp. Range-15°C to 55°C
Storage Temp. Range1-40°C to 80°C
Maximum Depth700ft (210m) / 300 PSI
  
Memory4MB – 400,000 records
Log TypesVariable, user-defined, logarithmic, profiled
Programmable Baud Rate (optional)9600, 19200, 38400
Logging Rate2x/sec maximum
SoftwareComplimentary Aqua4Plus or Aqua4Push
Networking32 available addresses per junction w/ batching capabilities (up to 255)
File Formats.xls / .csv / .a4d
  
Internal Battery2×1.5V AA alkaline2
Auxiliary Power12 VDC – Nominal
 6-15VDC – Range
Exp. Alkaline Battery Life18 months at 15m polling interval3
  
Element Type30K ohm thermistor
Element MaterialEpoxy bead/external housing
Accuracy± 0.2°C
Resolution0.1°C
Range-5°C to 60°C
UnitsCelsius, Fahrenheit, Kelvin
  
Sensor Type/Material Glass combination electrode
pH / ORPPlatinum ring
Ranges0-14 pH units / -538mV to 260mV
pH / ORP± 1200mV
UnitspH, mV, Eh
Typical Accuracy± 0.2 pH units
pH / ORP0.1 mVH
Resolution0.01 pH units
pH / ORP0.01 mVH units
Compensated Range0°C to 40°C
CalibrationOne or two point calibration w/ pH buffers 
 (7 & 4 or 10)
pH / ORPEH 1 pt. calibration
Reference SolutionPotassium Nitrate – (KNO3)
  
1. Storage without batteries 
2. Lithium available upon request 
3. May vary due to environmental factors