What does “solid‐state” sensor mean?

Document ID

Document ID TE2787

Version

Version 3.0

Status

Status Published

Published Date

Published Date 07/17/2018
Question
What does “solid‐state” sensor mean?
Summary
Solid state definition
Answer
“Solid‐state” sensors are used in Hach’s IntelliCAL™ Ammonium, Chloride, Fluoride and Nitrate Ion Selective Electrodes. These sensors are called “solid‐state” because they contain a solid gel ion exchange behind the ion‐selective membrane versus the liquid ion exchange commonly used in most ion selective electrodes. This solid backing consists of an acrylic based gel called Drytek. This proprietary material contains components that maintain hydration under dry conditions. There are several benefits of this type of sensor and reference system:

1. Membranes are non‐replaceable.
Traditional nitrate and ammonium PVC membrane ISEs have a liquid ion exchange construction and require membrane replacement every 2‐3 months. Hach’s IntelliCAL™ Nitrate and Ammonium probes with solid‐state sensors do not degrade from internal fill solution or gel media contact. They will provide up to two years of life without requiring replacement. This minimizes greatly reduces operating costs for customers.
2. Minimal maintenance.
Solid‐state sensors do not require membrane replacement or refilling of the electrolyte solution.
3. Consistent results.
The solid state sensor design doesn’t allow the membrane to flex or undergo surface area changes. This leads to more consistent results in a variety of samples.
4. Convenient storage.
Solid‐state ISEs can be stored dry without a shelf life. Minimal conditioning or electrode preparation is required at startup.

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