APS18 pH Electrode for Flue Gas Desulfurization and Exhaust-Gas Treatment
The ARTang APS18 is an industrial glass pH electrode designed for continuous pH measurement in wet flue gas desulfurization (FGD) slurry, exhaust-gas scrubber liquid and related wastewater applications containing suspended solids, sulfur-containing ions and heavy-metal ions.
Product highlights:
- Measurement range: 0–14 pH
- Operating temperature: 0–100°C
- Operating pressure: 0–3 bar
- Standard PG13.5 process connection
- Insertion lengths: 120, 150, 225, 325 or 425 mm
- Multiple temperature-element and connector options
Product Description
Wet flue gas desulfurization processes commonly circulate lime, limestone or magnesium-hydroxide slurry to absorb sulfur dioxide. Online pH measurement is used to monitor and control the liquid-phase chemistry, but suspended solids, scaling, sulfur-containing species and heavy-metal ions can coat the glass membrane, obstruct the liquid junction or contaminate the reference system.
The APS18 is configured for these demanding liquid-analysis duties. A high-temperature HT glass membrane supports pH measurement from 0 to 100°C, and the pressure-resistant glass body is specified for process pressure up to 3 bar. Available insertion lengths, temperature elements and electrical connectors allow the electrode to be matched to compatible holders, pH transmitters and replacement projects.
Technical Specifications
|
Parameter |
Specification |
|---|---|
|
Product model |
APS18 |
|
Product type |
Industrial pH electrode for wet FGD and exhaust-gas treatment liquids |
|
Measurement range |
0~14 pH |
|
Operating temperature |
0~100°C |
|
Operating pressure |
0~3 bar |
|
pH-sensitive membrane |
High-temperature glass membrane (HT) |
|
Sensing geometry |
Pressure-resistant cylindrical glass sensing membrane |
|
External junction material |
Special porous ceramic core |
|
Reference electrolyte |
GMT mixed gel; desulfurization-service formulation |
|
Reference construction |
Double liquid junction |
|
Temperature-element options |
NTC 10K, NTC 2.252K, NTC 22K, Pt100 or Pt1000 |
|
Factory slope |
>95% of the theoretical Nernst slope |
|
Glass membrane resistance |
<250 MΩ under specified test conditions |
|
Zero point |
pH 7.00 ±0.25 |
|
Response time |
<30 seconds under specified test conditions |
|
Process connection |
PG13.5 |
|
Standard insertion lengths |
120, 150, 225, 325 or 425 mm |
|
Electrical connectors |
S8, S8M, S7, VP, K8S or K2 |
|
Customized cable length |
Up to 60 m, subject to transmitter and installation compatibility |
|
Optional junction upgrade |
Annular porous PTFE junction |
Key Features and Engineering Benefits
Double Ceramic Junctions
Provides redundant ionic contact paths and helps reduce the effect of localized deposits in slurry service, while still allowing scheduled cleaning and inspection.
GMT Mixed-Gel Electrolyte for Desulfurization Service
Helps slow contaminant migration toward the internal reference and supports a low-maintenance sealed reference design.
Double-Junction Reference Construction
Extends the contamination path for sulfide and other poisoning ions, supporting more stable reference performance in complex process liquids.
High-Temperature HT Glass Membrane
Pressure-Resistant Cylindrical Sensing Design
Flexible Temperature Compensation and Connections
Typical Applications
Limestone–Gypsum Wet Flue Gas Desulfurization
- Absorber slurry recirculation tanks
- Limestone or lime slurry preparation and dosing circuits
- FGD absorber pH monitoring
- Oxidation and reaction tanks
- Gypsum dewatering filtrate and return water
- FGD purge-water and wastewater treatment
Magnesium-Hydroxide and Other Wet Scrubber Systems
- Magnesium-hydroxide slurry scrubbers
- Caustic or alkaline exhaust-gas washing liquor
- Industrial boiler wet scrubbers
- Incinerator exhaust-gas treatment systems
- Steel, metallurgy and chemical-plant wet gas cleaning
Desulfurization and Denitrification Wastewater
- Wet flue-gas treatment wastewater
- Neutralization and precipitation tanks
- Heavy-metal removal processes
- Clarification and treated-effluent pH monitoring
- Integrated exhaust-gas treatment water circuits
Power Plant and Industrial Environmental Systems
- Coal-fired and industrial boiler FGD systems
- Waste-to-energy flue-gas cleaning
- Sintering and metallurgical exhaust-gas treatment
- Chemical and fertilizer plant scrubber systems
- Environmental-treatment skids and OEM monitoring panels
Frequently Asked Questions
No. A glass pH electrode measures an aqueous liquid or slurry. The APS18 is installed in the liquid phase of a wet scrubber, slurry tank, recirculation loop or wastewater process; it is not a direct gas-phase sensor.
Not as a direct gas-phase pH sensor. It may be used only where the overall exhaust-gas treatment system includes a suitable liquid or wastewater measurement point whose chemistry and installation conditions have been confirmed.
The additional electrolyte chamber increases the diffusion path between the process and the internal reference element. This helps reduce reference contamination by sulfur-containing and other poisoning ions.
Possibly, but the PG13.5 thread alone is not sufficient. Also confirm insertion length, sealing position, holder geometry, connector, temperature element, cable and transmitter input.
The interval depends on slurry loading, gypsum or scale formation, sulfide exposure, process temperature and the required measurement confidence. Establish the interval by trending slope, zero point, drift and deposit buildup.
Request a Quote and Application Review
Need an APS18 quotation or application confirmation for a wet FGD slurry, scrubber-liquid or exhaust-gas treatment wastewater process? Send ARTang the measured liquid, pH range, temperature, pressure, suspended solids, sulfur species, heavy metals, installation method, insertion length, temperature element, connector and transmitter model.
ARTang will help review the electrode configuration, holder compatibility, chemical exposure, cable connection and complete pH measurement loop before quotation.
Factory Strength & Quality Assurance
ARTang supports industrial measurement projects with in-house production, strict calibration, certified quality control, and global exhibition experience.
Factory Production
In-house production and assembly for stable product quality and reliable delivery.
CNC Machining Equipment
Product Assembly
CNC Machining
Welding Process
warehouse
Technical Support Department
Certified Quality
Product certificates and quality control systems support reliable industrial measurement applications.
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Exhibition Experience
ARTang meets customers and distributors at industry exhibitions to better understand project needs and market requirements.
