Ion-selective electrodes
Potassium, Fluoride, Aluminium, Phosphate, Lithium, Ammonium, Copper, Cyanide, Chloride, Sodium, Calcium, Magensium, Silver, Nitrate, Bromide
Ion-selective and gas-sensitive electrodes are used for measuring the dissolved concentration of specific ions or gases in water. Similar to the pH electrode, the membrane interacts with the dissolved ions and delivers a concentration-dependent voltage signal that is converted to the corresponding measurement result.
Highlights:
- Space-saving through integrated reference electrode
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broad selection of applications including ammonium measurement
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Slim and space-saving design with 12 mm shaft diameter
| Variants | |||||
| Art.-Nr. | Name | Description | Connection | ||
| 106395 | NH 500/2 | Ammonium-selective electrode | S7-Plug head, without cable | ||
| 106649 | Na 800/S7 | Sodium-selective electrode | S7-Plug head, without cable | ||
| 106651 | Ag/S 800 DIN | Silver-/Sulphide-selective electrode | 1 m DIN cable | ||
| 106653 | Br 800 DIN | Bromide-selective electrode | 1 m DIN cable | ||
| 106655 | Ca 800 DIN | Calcium-/Magnesium-selective electrode | 1 m DIN cable | ||
| 106656 | Ca 800/AT | Exchange head for Ca 800 | - | ||
| 106661 | Cl 800 DIN | Chloride-selective electrode | 1 m DIN cable | ||
| 106663 | CN 800 DIN | Cyanide-selective electrode | 1 m DIN cable | ||
| 106665 | Cu 800 DIN | Copper-/Nickel-selective electrode | 1 m DIN cable | ||
| 106666 | F 800 BNC | Fluoride-/Aluminium-/ Phosphate-/Lithium-selective electrode |
1 m BNC cable | ||
| 106667 | F 800 DIN | Fluoride-/Aluminium-/ Phosphate-/Lithium-selective electrode |
1 m DIN cable | ||
| 106671 | K 800 DIN | Potassium-selective electrode | 1 m DIN cable | ||
| 106672 | K 800/AT | Exchange head for K 800 | - | ||
| 106675 | NO 800 DIN | Nitrate-selective electrode | 1 m DIN cable | ||
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Electrode NH 500/2 Na 800/S7 Ag/S 800 DIN Br 800 DIN Art.-No. 106395 106649 106651 106653 Ions Ammonium Sodium Silver-/Sulphide Bromide Measuring range 10-6 ... 5 · 10-2 mol/l NH4+
0,02 ... 900 mg/l NH4+10-6 ... 1 mol/l Na+
0,01...23000 mg/l Na+Ag: 0,01 ... 108.000 mg/l
Sulfid: 0,003 bis 32.000 mg/l0,4 ... 79000 mg/l Br- Reference electrolyte - 3 mol/l KCl - - Diaphragm - Platin - - pH range 8 ... 11 2 ... 12 1 ... 12 Temperature range 0 ... 50 °C -10 ... +80 °C 0 ... 80 °C 0 ... 80 °C Membrane resistance < 500 MΩ < 1 MΩ < 0,1 MΩ Shaft length 120 mm 120 mm 120 mm 120 mm Shaft diameter 12 mm 12 mm 12 mm 12 mm Immersion depth min. 5 mm
max. 50 mmmin. 20 mm
max. 100 mmNeeds: Ionic strength-adjusting
solution MZ/NH3/CN,
Standard solution ES/NH4Ionic strength-adjusting
solution ISA/Na,
Standard solution ES/Na,
Cable AS/DIN or AS/BNCBridge electrolyte ELY/BR/503,
Ionic strength-adjusting solution ISA/FK (Ag-Ionen) or according
to the operating
instructions for sulphide
measurementBridge electrolyte ELY/BR/503,
Ionic strength-adjusting solution ISA/FK,
Standard solution ES/BrAddit.
scope of delivery3 exchange heads, 50 ml electrolyte solution - - Electrolyte Connection S7-plug head, without cable S7-plug head, without cable 1 m DIN cable 1 m DIN cable Elektrode Ca 800 DIN Cl 800 DIN CN 800 DIN Cu 800 DIN Art.-No. 106655 106661 106663 106665 Ions Calcium Chloride Cyanide Copper/Nickel Measuring range 0,02 ... 40.000 mg/l Ca2+ 2 ... 35.000 mg/l Cl- 0,2 ... 260 mg/l CN- (empfohlen 0,2 ... 25 mg/l CN- )
8 x 10-6 ... 1 x 10-2 mol/l CN-
(empfohlen 8 x 10-6 ... 1 x 10-3 mol/l CN- )6 x 10-4 ... 6.350 mg/l Cu2+ Reference electrolyte - - - - Diaphragm - - - - pH range 2,5 ... 11 2 ... 12 0 ... 14 2 ... 6 Temperature range 0 ... 40 °C 0 ... 80 °C 0 ... 80 °C 0 ... 80 °C Membrane resistance 1 bis 4 MΩ < 1 MΩ < 30 MΩ < 1 MΩ Shaft length 120 mm 120 mm 120 mm 120 mm Shaft diameter 12 mm 12 mm 12 mm 12 mm Immersion depth Needs: Bridge electrolyte ELY/BR/503,
Ionic strength-adjusting solution ISA/Ca,
Standard solution ES/CaBridge electrolyte ELY/BR/503,
Ionic strength-adjusting solution ISA/FK,
Standard solution ES/ClBridge electrolyte ELY/BR/503,
Ionic strength-adjusting solution MZ/NH3/CNBridge electrolyte ELY/BR/503,
Ionic strength-adjusting solution ISA/FK
Standard solution ES/CuAddit.
scope of deliveryElectrolyte and exchange heads Electrolyte Electrolyte Electrolyte Connection 1 m DIN cable 1 m DIN cable 1 m DIN cable 1 m DIN cable Elektrode F 800 BNC F 800 DIN K 800 DIN NO 800 DIN Art.-No. 106666 106667 106671 106675 Ions Fluoride/Aluminium/
Phosphate/LithiumPotassium Nitrate Measuring range 0,02 mg/l F- (10-6 mol/l) bis Sättigung 0,04 ... 39.000 mg/l K+ 0,4 ... 62.000 mg/l NO3- Reference electrolyte - - - Diaphragm - - - pH range 5 ... 7 2 ... 12 2,5 ... 11 Temperature range 0 ... 80 °C 0 ... 40 °C 0 ... 40 °C Membrane resistance 0,15 ... 0,2 MΩ < 50 MΩ 1 bis 5 MΩ Shaft length 120 mm 120 mm 120 mm Shaft diameter 12 mm 12 mm 12 mm Immersion depth Needs: Bridge electrolyte ELY/BR/503,
Ionic strength-adjusting solution TISAB,
Standard solution ES/FBridge electrolyte ELY/BR/503/K,
Ionic strength-adjusting solution ISA/K,
Standard solution ES/KBridge electrolyte ELY/BR/503/N,
Ionic strength-adjusting solution TISAB/NO3,
Standard solution ES/NO3Addit.
scope of deliveryElectrolyte and exchange heads Electrolyte and exchange heads Electrolyte and exchange heads Connection 1 m BNC cable 1 m DIN cable 1 m DIN cable 1 m DIN cable
Case Studies
Municipal Wastewater Treatment · WTW — Stock Configuration Case
Customer Profile
The typical setting in Municipal Wastewater Treatment is the inlet, biological and outlet stages of a municipal plant. The measuring point is WTW; the focus is covering online and laboratory water analysis with WTW instruments.
Key Difficulties
Conditions are high solids and corrosive fractions, with large diurnal flow swings and, on top of that, effluent parameters drift and probes foul with sludge and biofilm, which a standard configuration cannot handle for long. The design therefore starts with selected by parameter set, range and digital sensor protocol.
Implementation
The scope ran through the stock channel: configuring from stock and delivered quickly. Technically it hinges on selected by parameter set, range and digital sensor protocol, and on these requirements: stable compliance with Grade 1A discharge limits and online data reporting.
Customer Benefit
In practice this means plug-and-play digital sensors that keep calibration when swapped, which cut the workload on the site maintenance team.
Food & Beverage · WTW — Stock Configuration Case
Project Background
The project covers dosing, pasteurising, filling and CIP stages. The work centres on WTW and the core task is covering online and laboratory water analysis with WTW instruments.
Operating Challenges
The medium and duty are characterised by syrups, dairy and beverages that scale easily, under strict hygienic requirements, and frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles. So WTW cannot be specified generically — it calls for selected by parameter set, range and digital sensor protocol.
Solution
The Ainstru engineering team worked through the stock channel: configuring from stock and delivered quickly. The configuration involves selected by parameter set, range and digital sensor protocol, with these requirements in view: food-safety and hygienic design per 3-A / EHEDG.
Results
Since start-up the system has run steadily; the practical result is plug-and-play digital sensors that keep calibration when swapped.
Chemical & Pharmaceutical · WTW — Stock Configuration Case
Project Overview
The site is reactors, metering vessels and finished-product tanks. The customer wanted WTW properly configured on the existing plant, with the aim of covering online and laboratory water analysis with WTW instruments.
Technical Challenges
What actually causes trouble is highly corrosive media with solvents and crystallisation, partly in explosive atmospheres, and corrosion plus Ex protection shortens instrument life and makes downtime costly. All of this means the WTW configuration has to involve selected by parameter set, range and digital sensor protocol.
Configuration
Supply and installation were organised through the stock channel: configuring from stock and delivered quickly. On site this meant selected by parameter set, range and digital sensor protocol, checked line by line against: Ex certification and GMP traceability of records.
Performance
After commissioning the outcome is plug-and-play digital sensors that keep calibration when swapped, and the readings are now used for process tuning.
Power & Energy · WTW — Stock Configuration Case
Site Conditions
This is a Power & Energy customer whose plant is at boiler feedwater, turbine condensate and FGD/DeNOx systems. The main task was covering online and laboratory water analysis with WTW instruments.
The Problem
The difficulty lies in high temperature and pressure with both steam and saline water; at the same time drift under high temperature and pressure, with very costly unplanned outages. Specification therefore means selected by parameter set, range and digital sensor protocol.
What We Did
We took a stock channel approach — configuring from stock and delivered quickly. Delivery was built around selected by parameter set, range and digital sensor protocol, with point-by-point checks on: compliance with power-industry codes and unit availability targets.
Operating Outcome
In service the system performs as intended — plug-and-play digital sensors that keep calibration when swapped, with routine maintenance falling noticeably.
