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AlpHa - Ion Selective Electrodes (ISE) ...

AlpHa - Ion Selective Electrodes (ISE) in Drinking Water

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Monitoring and controlling specific ion strengths at multiple stages along the drinking water production process ensures the final product is safe for consumption. Ion-selective electrodes (ISE) are commonly used to address specific issues related to drinking water production and community water quality.

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Fluoride is added to promote healthy teeth. However, higher concentrations can cause skeletal fluorosis.
Lead can be released into drinking water from corrosion in water distribution systems. Monitoring lead is critical as even low levels (ppb) is hazardous to human health.
Water hardness, also referred to as total calcium and magnesium, is routinely monitored to prevent health issues. High levels of water hardness can dissolve the zinc protective layer in galvanized pipes resulting in leaching of heavy metals (cadmium, lead, etc.).

Chloride is measured to avoid high concentration levels which can cause pipe corrosion in water distribution systems.
Cadmium can be released from damaged water distribution systems and requires close monitoring.
Nitrate, at high levels, could indicate contamination (from agricultural runoffs or leaking septic systems) and could cause a variety of health issues.

Utilizing ISEs in drinking water applications may become complicated by pressure, flow, and chemical contamination. These challenges can be mitigated with the optimal sensor design. AlpHa offers various mechanical insertion assemblies, specialized housing materials, and reference systems for the required specifications. AlpHa’s ISE portfolio can target over twenty different ions which are designed for both lab and continuous process environments.

Form Factor
- 12 mm
- Process Body
- Cartridge
- Custom Options Available
Housing Material Options
- Glass
- Ryton® (PPS)
- ABS
- Epoxy
- Polycarbonate
- Kynar® (PVDF)
- Polyethylene
- PEEK
- PVC / CPVC
- Teflon™ (PTFE)
- Ultem® (PEI)
- Custom Options Available
Thermistor Options
- Not commonly integrated, however, optional per design requirements
Reference System
- Ag / AgCl
- Custom Options Available
Reference Junction Options
- Single Junction
- Double Junction
- Custom Options Available
Reference Junction Material / Design
- Ceramic Pin / Annular / Disc
- Fiber / Pellon
- Open Aperture
- Porous Plastic (PTFE / HDPE / PP)
- Sleeve Junction / Free Flow (liquid / liquid or ground glass joint)
- Solid State
- Custom Options Available
Reference Electrolyte
- Sealed
  - Soft Gel
  - Solid Gel
- Refillable
  - Liquid
  - Soft Gel
- Custom Options Available
Integrated Insertions
- PG 13.5
- 3/4" NPT
- 1/2" NPT
- 1" NPT
- Custom Options Available

Analog
- Millivolts
- 0 – 5 V
- 0 – 10 V
- 4 – 20 mA
- Custom Options Available
Digital
- RS-485 MODBUS RTU
- Custom Options Available
Connectors
- Integrated Connectors (detachable or cableless)
  - S7
  - S8
  - Integrated BNC
  - Variopin
  - Custom Options Available
- Connectors with Cables (including temperature)
  - BNC
  - DIN
  - MOLEX
  - Tinned Leads
  - Mil-spec
  - 2.5 mm / 3.5 mm phono
  - RCA
  - Spade Lugs
  - LEMO
  - Circular Connectors
  - Any commercially available connectors and custom options available