Editorial Technical Reference

pH Monitoring Probe

This page explains how pH Monitoring Probe is classified within Leather and Related Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A sensor device used to measure and monitor the pH level in a deliming bath solution.

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Product Specifications

Technical details and manufacturing context for pH Monitoring Probe

Definition
The pH Monitoring Probe is a critical component of the deliming bath system in leather processing. It continuously measures the acidity or alkalinity (pH level) of the bath solution, which is essential for controlling the deliming process where lime is removed from hides. Accurate pH monitoring ensures optimal chemical activity, prevents damage to the leather, and maintains consistent product quality. The probe is designed for integration into industrial process control systems, providing real-time data for automated adjustments. Its construction includes a glass electrode, reference electrolyte, stainless steel housing, and epoxy resin seal, ensuring durability in harsh chemical environments. The device operates across a full pH scale of 0–14 with an accuracy of ±0.1 pH at 25°C, and a response time of ≤30 seconds to 95% of the final value. It is rated for continuous operation in temperatures from 0 to 80°C. The probe requires a 24 V DC supply (24 ±10%) with reverse polarity protection, and outputs a 4–20 mA two-wire loop signal. Ingress protection ranges from IP65 to IP68 (per IEC 60529), with IP68 for submersible applications. The body is made of 316L stainless steel (per ASTM A240), and the diaphragm is PTFE for chemical resistance. The standard process connection is G1/2 (per ISO 228-1). Weight varies from 0.5 to 1.0 kg depending on cable length. This directory entry provides reference specifications; actual model values and standards compliance must be verified with the legal manufacturer or supplier before procurement or installation.
Working Principle
The probe operates using a glass electrode that generates a voltage proportional to the hydrogen ion concentration in the solution. This voltage is measured against a reference electrode, converted to a pH value through the Nernst equation, and transmitted to a monitoring or control system. The glass electrode is sensitive to hydrogen ions, creating a potential difference that varies with pH. The reference electrode provides a stable baseline potential. The combined voltage is processed by a transmitter, which applies the Nernst equation to calculate pH and outputs a standardized 4–20 mA signal. This signal can be read by a PLC or distributed control system for process control and data logging. Proper calibration and maintenance of the electrode are essential for accurate readings.
Common Materials
Glass electrode, Reference electrolyte, Stainless steel housing, Epoxy resin seal
Technical Parameters
ParameterTypical rangeNotes & selection driver
Measurement Range0–14 pHFull pH scale
Accuracy±0.1 pHAt 25°C
Response Time≤30 sTo 95% of final value
Operating Temperature0–80 °CContinuous operation
Supply Voltage24 ±10% V DCReverse polarity protected
Output Signal4–20 mATwo-wire loop powered
Ingress ProtectionIP65–IP68IP68 for submersibleIEC 60529
Body Material316LStainless steelASTM A240
Diaphragm MaterialPTFEChemical resistant
Connection ThreadG1/2Standard process connectionISO 228-1
Weight0.5–1.0 kgDepending on cable length

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Glass Electrode
    Senses hydrogen ion concentration and generates corresponding voltage
    Material: pH-sensitive glass bulb
  • Reference Electrode
    Provides stable reference potential for measurement comparison
    Material: Silver/silver chloride with potassium chloride electrolyte
  • Electrode Body Part
    Protects internal components and provides structural integrity
    Material: Chemical-resistant plastic or stainless steel
  • Junction
    Allows ionic contact between reference electrolyte and sample solution
    Material: Ceramic, PTFE, or glass fiber
  • Cable Connector Part
    Transmits electrical signals to monitoring equipment
    Material: PVC or polyurethane with copper conductors

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Deliming Bath
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0-10 bar (0-145 psi)
flow rate: 0-2 m/s (0-6.6 ft/s)
temperature: 0-80°C (32-176°F)
slurry concentration: 0-30% solids by weight
Media Compatibility
✓ Deliming bath solutions (acidic/alkaline) ✓ Industrial wastewater treatment ✓ Chemical process streams
Unsuitable: Hydrofluoric acid or highly abrasive slurries
Sizing Data Required
  • Process pH range (e.g., 1-14)
  • Required accuracy and resolution (±0.01 pH)
  • Installation type (in-line, submersion, or flow-through)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Reference electrode poisoning
Cause: Contamination from process fluids, sulfides, or heavy metals that deplete the electrolyte or clog the reference junction, leading to inaccurate or drifting pH readings.
Glass membrane degradation
Cause: Chemical attack from highly alkaline solutions (pH > 12) or hydrofluoric acid, or mechanical damage from abrasive particles or improper handling, causing slow response, calibration drift, or complete failure.
Maintenance Indicators
  • Slow response time during calibration or process checks (e.g., taking minutes instead of seconds to stabilize)
  • Unstable or drifting readings despite calibration, or readings stuck at a fixed value (e.g., pH 7)
Engineering Tips
  • Implement regular cleaning and calibration schedules using appropriate solutions (e.g., mild acid for scale, enzyme cleaners for organic fouling) and store the probe in proper storage solution when not in use.
  • Use protective guards or flow cells to shield the probe from direct abrasion or high-pressure streams, and select probe materials (e.g., specialized glass for high alkalinity) compatible with the process fluid chemistry.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 17025:2017 - General requirements for the competence of testing and calibration laboratories ASTM E70-19 - Standard Test Method for pH of Aqueous Solutions with the Glass Electrode IEC 61010-2-101:2018 - Safety requirements for electrical equipment for measurement, control, and laboratory use - Particular requirements for in vitro diagnostic (IVD) medical equipment

Quoted from the published standard.

Manufacturing Precision
  • pH Accuracy: +/- 0.02 pH units at 25°C
  • Response Time: 95% of final reading within 30 seconds
Quality Inspection
  • Calibration Verification against NIST-traceable buffer solutions
  • Electrode Impedance and Slope Testing

Manufacturers of pH Monitoring Probe

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Frequently Asked Questions

What is the measurement range of this pH probe?

The probe measures pH across the full scale of 0 to 14, with an accuracy of ±0.1 pH at 25°C. This range covers typical deliming bath conditions.

What output signal does the probe provide?

The probe provides a 4–20 mA two-wire loop-powered output, which is standard for industrial process control. This signal can be interfaced with PLCs or control systems.

What materials are used in the probe construction?

The probe is rated for continuous operation from 0 to 80°C. The diaphragm is PTFE for chemical resistance. These materials are selected for durability in harsh chemical environments.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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