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pH Combination Electrode

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pH Combination Electrode | E-201 Series

pH Combination Electrode

E-201 series glass combination electrodes with a sealed plastic housing, non-refillable structure, and reliable pH measurement for aqueous solutions.

Product Description

The pH combination electrode integrates a glass electrode and a reference electrode in one plastic housing. Its non-refillable structure serves as the sensing element of a pH meter, detecting hydrogen-ion activity in aqueous solutions and converting it into a pH value. The compact and convenient design is suitable for chemical, pharmaceutical, dye, environmental water-treatment, aquaculture, and research applications.

Product Series and Product Images

E-201 sealed pH combination electrode
E-201 Sealed Version | 1 m Standard Cable
Maintenance-free sealed reference
Export aquarium pH electrode
Export pH Electrode | Aquarium Version
Aquariums and routine water samples
E-201-C refillable pH combination electrode
E-201-C Refillable Version | 1 m Standard Cable
KCl replenishment supported

Technical Parameter Comparison

ItemE-201 SealedE-201-C RefillableExport Aquarium Version
StructureIntegrated plastic housing; non-refillableIntegrated plastic housing; refillable KClPlastic combination structure
Measurement Range0–14 pH
Measurement Temperature0–60 °C
Zero Potential at 25 °C7 ± 0.5 pH
Theoretical Slope PTS at 25 °C≥ 98.5%
Internal Resistance at 25 °C≤ 250 MΩ
Alkaline Error at 25 °C≤ 0.2 pH (1 mol/L Na+, pH 14)
Response Time≤ 1 min

Use, Maintenance, and Precautions

  1. Calibrate with a reliable standard buffer before measurement. Select a buffer close to the expected sample value.
  2. When removing the protective cap, keep the sensitive glass bulb away from hard objects. Damage or scratches may cause failure.
  3. After measurement, replace the protective cap and keep a small amount of 3.3 mol/L KCl inside it to keep the bulb moist.
  4. Keep the lead end clean and dry. Never short-circuit the two output terminals.
  5. The connected pH meter should have an input impedance of at least 10¹² Ω.
  1. Avoid prolonged immersion in distilled water, protein solutions, or acidic fluoride solutions, and keep away from silicone oils and greases.
  2. When performance declines, the lower end may be immersed in 4% HF for 3–5 seconds, immediately rinsed with distilled water, and conditioned in KCl. This must be performed by trained personnel.
  3. If the bulb is contaminated or the liquid junction is blocked, select a suitable cleaning solution according to the contaminant.
  4. When measuring organic solvents that dissolve polycarbonate resin, use a glass-housing model such as 65-1Q9.

Frequently Asked Questions

Why must the electrode be calibrated?

The glass-membrane potential changes with temperature, service time, and sample conditions. Calibration with standard buffers corrects the zero point and slope for reliable readings.

How should the electrode be stored when not in use?

Keep the bulb moist by adding a small amount of 3.3 mol/L KCl to the protective cap. Do not store it dry or immerse it in distilled water for long periods.

What should I do if the reading drifts or the response becomes slow?

Check calibration, wiring, and the liquid junction first. Then clean it according to the contaminant and replace the electrode if necessary. Avoid wiping the glass bulb.

How should I choose between E-201 and E-201-C?

E-201 is sealed and simple to maintain. E-201-C allows KCl replenishment and is suitable when long-term maintenance or reference-performance recovery is needed.

pH Combination Electrode ' Specifications and Prices
PH COMBINATION ELECTRODES

pH Combination Electrode

E-201 series sealed, refillable, and export aquarium pH electrodes, with compatible filling solution and protective caps.

Specifications and Price Table

Product NameModel / CategorySpecificationPrice (USD)
pH Combination Electrode and AccessoriesE-201-CRefillable version ' 1 m standard cable$18
E-201Sealed version ' 1 m standard cable$18
Export pH ElectrodeFor aquariums$14
KCl Filling Solution10 mL per bottle$6
Large Protective Cap1 piece$5
Small Protective Cap1 piece$6
Industrial Protective CapFor domestic industrial electrodes$10

USD prices are calculated as the CNY price divided by 5 and rounded to the nearest whole dollar. Prices apply only to the specifications listed. Protective caps and KCl filling solution are compatible accessories.

Purchase Channels

Amazon

Suitable for standard pH electrodes and routine laboratory procurement.

Amazon

eBay

Suitable for comparing models, accessories, and available configurations.

eBay

AliExpress

Suitable for electrode accessories and product procurement.

AliExpress

Partial references citing our materials (from Google Scholar)


Carbon Dioxide Reduction

1. ACS Nano Strain Relaxation in Metal Alloy Catalysts Steers the Product Selectivity of Electrocatalytic CO2 Reduction

The bipolar membrane (Fumasep FBM) in this paper was purchased from SCI Materials Hub, which was used in rechargeable Zn-CO2 battery tests. The authors reported a strain relaxation strategy to determine lattice strains in bimetal MNi alloys (M = Pd, Ag, and Au) and realized an outstanding CO2-to-CO Faradaic efficiency of 96.6% with outstanding activity and durability toward a Zn-CO2 battery.


2. Front. Chem. Boosting Electrochemical Carbon Dioxide Reduction on Atomically Dispersed Nickel Catalyst

In this paper, Vulcan XC-72R was purchased from SCI Materials Hub. Vulcan XC 72R carbon is the most common catalyst support used in the anode and cathode electrodes of Polymer Electrolyte Membrane Fuel Cells (PEMFC), Direct Methanol Fuel Cells (DMFC), Alkaline Fuel Cells (AFC), Microbial Fuel Cells (MFC), Phosphoric Acid Fuel Cells (PAFC), and many more!


3. Adv. Mater. Partially Nitrided Ni Nanoclusters Achieve Energy-Efficient Electrocatalytic CO2 Reduction to CO at Ultralow Overpotential

An AEM membrane (Sustainion X37-50 Grade RT, purchased from SCI Materials Hub) was activated in 1 M KOH for 24 h, washed with ultra-purity water prior to use.


4. Adv. Funct. Mater. Nanoconfined Molecular Catalysts in Integrated Gas Diffusion Electrodes for High-Current-Density CO2 Electroreduction

In this paper (Supporting Information), an anion exchanged membrane (Fumasep FAB-PK-130 obtained from SCI Materials Hub (www.scimaterials.cn)) was used to separate the catholyte and anolyte chambers.

SCI Materials Hub: we also recommend our Fumasep FAB-PK-75 for the use in a flow cell.


5. Appl. Catal. B Efficient utilization of nickel single atoms for CO2 electroreduction by constructing 3D interconnected nitrogen-doped carbon tube network

In this paper, the Nafion 117 membrane was obtained from SCI Materials Hub.


6. Vacuum Modulable Cu(0)/Cu(I)/Cu(II) sites of Cu/C catalysts derived from MOF for highly selective CO2 electroreduction to hydrocarbons

In this paper, Proton exchange membrane (Nafion 117), Nafion D520, and Toray 060 carbon paper were purchased from SCI Materials Hub.


7. National Science Review Confinement of ionomer for electrocatalytic CO2 reduction reaction via efficient mass transfer pathways

An anion exchange membrane (PiperION-A15-HCO3) was obtained from SCI Materials Hub.


8. Catalysis Communications Facilitating CO2 electroreduction to C2H4 through facile regulating {100} & {111} grain boundary of Cu2O

Carbon paper (TGPH060), membrane solution (Nafion D520), and ionic membrane (Nafion N117) were obtained from Wuhu Eryi Material Technology Co., Ltd (a company under SCI Materials Hub).


Batteries

1. J. Mater. Chem. A Blocking polysulfides with a Janus Fe3C/N-CNF@RGO electrode via physiochemical confinement and catalytic conversion for high-performance lithium–sulfur batteries

Graphene oxide (GO) in this paper was obtained from SCI Materials Hub. The authors introduced a Janus Fe3C/N-CNF@RGO electrode consisting of 1D Fe3C decorated N-doped carbon nanofibers (Fe3C/N-CNFs) side and 2D reduced graphene oxide (RGO) side as the free-standing carrier of Li2S6 catholyte to improve the overall electrochemical performance of Li-S batteries.


2. Joule A high-voltage and stable zinc-air battery enabled by dual-hydrophobic-induced proton shuttle shielding

This paper used more than 10 kinds of materials from SCI Materials Hub and the authors gave detailed properity comparsion.

The commercial IEMs of Fumasep FAB-PK-130 and Nafion N117 were obtained from SCI Materials Hub.

Gas diffusion layers of GDL340 (CeTech) and SGL39BC (Sigracet) and Nafion dispersion (Nafion D520) were obtained from SCI Materials Hub.

Zn foil (100 mm thickness) and Zn powder were obtained from the SCI Materials Hub.

Commercial 20% Pt/C, 40% Pt/C and IrO2 catalysts were also obtained from SCI Materials Hub.


3. Journal of Energy Chemistry Vanadium oxide nanospheres encapsulated in N-doped carbon nanofibers with morphology and defect dual-engineering toward advanced aqueous zinc-ion batteries

In this paper, carbon cloth (W0S1011) was obtained from SCI Materials Hub. The flexible carbon cloth matrix guaranteed the stabilization of the electrode and improved the conductivity of the cathode.


4. Energy Storage Materials Defect-abundant commercializable 3D carbon papers for fabricating composite Li anode with high loading and long life

The 3D carbon paper (TGPH060 raw paper) were purchased from SCI Materials Hub.


5. Nanomaterials A Stable Rechargeable Aqueous Zn–Air Battery Enabled by Heterogeneous MoS2 Cathode Catalysts

Nafion D520 (5 wt%), and carbon paper (GDL340) were received from SCI-Materials-Hub.


6. SSRN An Axially Directed Cobalt-Phthalocyanine Covalent Organic Polymer as High-Efficient Bifunctional Catalyst for Zn-Air Battery

Carbon cloth (W0S1011) and other electrochemical consumables required for air cathode were provided by SCI Materials Hub.


Oxygen Reduction Reaction

1. J. Chem. Eng. Superior Efficiency Hydrogen Peroxide Production in Acidic Media through Epoxy Group Adjacent to Co-O/C Active Centers on Carbon Black

In this paper, Vulcan XC 72 carbon black, ion membrane (Nafion N115, 127 μL), Nafion solution (D520, 5 wt%), and carbon paper (AvCarb GDS 2230 and Spectracarb 2050A-1050) were purchased from SCI Materials Hub.


2. Journal of Colloid and Interface Science Gaining insight into the impact of electronic property and interface electrostatic field on ORR kinetics in alloy engineering via theoretical prognostication and experimental validation

The 20 wt% Pt3M (M = Cr, Co, Cu, Pd, Sn, and Ir) were purchased from SCI Materials Hub. This work places emphasis on the kinetics of the ORR concerning Pt3M (M = Cr, Co, Cu, Pd, Sn, and Ir) catalysts, and integrates theoretical prognostication and experimental validation to illuminate the fundamental principles of alloy engineering.


Water Electrolysis

1. International Journal of Hydrogen Energy Gold as an efficient hydrogen isotope separation catalyst in proton exchange membrane water electrolysis

The cathodic catalysts of Pt/C (20 wt%, 2–3 nm) and Au/C (20 wt%, 4–5 nm) were purchased from SCI Materials Hub.


2. Small Science Silver Compositing Boosts Water Electrolysis Activity and Durability of RuO2 in a Proton-Exchange-Membrane Water Electrolyzer

Two fiber felts (0.35 mm thickness, SCI Materials Hub) were used as the porous transport layers at both the cathode and the anode.


3. Advanced Functional Materials Hierarchical Crystalline/Amorphous Heterostructure MoNi/NiMoOx for Electrochemical Hydrogen Evolution with Industry-Level Activity and Stability

Anion-exchange membrane (FAA-3-PK-130) was obtained from SCI Materials Hub website.


Fuel Cells

1. Polymer Sub-two-micron ultrathin proton exchange membrane with reinforced mechanical strength

Gas diffusion electrode (60% Pt/C, Carbon paper) was purchased from SCI Materials Hub.


Characterization

1. Chemical Engineering Journal Electrochemical reconstitution of Prussian blue analogue for coupling furfural electro-oxidation with photo-assisted hydrogen evolution reaction

An Au nanoparticle film was deposited on the total reflecting plane of a single reflection ATR crystal (SCI Materials Hub, Wuhu, China) via sputter coater.

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