APS21 pH Electrode Plastic Body for Municipal Sewage and Industrial Wastewater Treatment
The APS21 plastic-body pH electrode is designed for continuous pH monitoring in municipal wastewater treatment, industrial wastewater treatment, aquaculture, and other general process applications.
It combines an industrial-grade glass electrode with a reinforced ABS outer housing. This design maintains the chemical sensing performance of the glass electrode while providing additional protection during installation and operation.
- Measurement range: 0 to 14 pH
- Process temperature: 0 to 80°C
- Process pressure: 0 to 2 bar
- Protection rating: IP68
- Process connection: 3/4” NPT
Product Description
The APS21 covers a measurement range of 0 to 14 pH and an operating temperature range of 0 to 80°C. A 3/4-inch threaded process connection and an IP68 protection rating make it suitable for wastewater treatment, agricultural water monitoring, aquaculture, surface water monitoring, and other routine water-quality applications.
The APS21 is available with temperature compensation and can be equipped with an NTC thermistor, an RTD platinum resistance sensor, or other compatible temperature elements. This configuration enables the electrode to be matched with a wide range of pH transmitters and controllers for different monitoring and control systems.
Specification
|
Parameter |
Specification |
|---|---|
|
Measurement range |
0 to 14 pH |
|
Process temperature |
0 to 80°C |
|
Process pressure |
0 to 2 bar |
|
Temperature element options |
NTC 10K, NTC 2.252K, NTC 22K, Pt100 or Pt1000 |
|
Factory slope |
>95% |
|
Zero potential |
pH 7.00 ±0.25 |
|
Response time |
<30 seconds |
|
Glass membrane |
HA acid- and alkali-resistant glass membrane |
|
Reference junction |
Porous ceramic junction |
|
Reference electrolyte |
Polymer gel |
|
Reference system |
Single junction |
|
Process connection |
3/4 "NPT |
|
Housing material |
Glass-fiber-reinforced ABS |
|
Protection rating |
IP68 |
|
Total length |
144 mm |
|
Maximum body diameter |
32 mm |
|
Cable connection |
Integrated direct cable |
|
Cable length |
Standard 5m |
Key Features
Reinforced ABS Protective Housing
The internal glass pH element is enclosed by a glass-fiber-reinforced ABS body, helping reduce the risk of accidental glass damage during handling and installation. Engineering benefit: Lower replacement risk in industrial environments compared with fully exposed laboratory-style glass electrodes.
Optional Temperature Compensation Elements
Available temperature element options include: NTC 10K NTC 2.252K NTC 22K Pt100 Pt1000 Engineering benefit: Allows compatibility with different pH transmitters, controllers and automatic temperature compensation systems. The temperature element must be selected according to the input specification of the connected instrument.
Gel-Filled Reference System
The standard configuration uses a polymer gel reference electrolyte with a porous ceramic junction. Engineering benefit: Reduces routine electrolyte replenishment and supports low-maintenance continuous operation.
IP68 Construction
The sealed sensor structure is designed for continuous immersion and wet industrial environments. Engineering benefit: Suitable for tanks, channels, treatment basins and other permanently wet installation locations.
Typical Applications
This industrial pH electrode is suitable for continuous pH monitoring in:
Municipal Wastewater Treatment
- Inlet and outlet pH monitoring
- Neutralization tanks
- Biological treatment processes
- Effluent discharge monitoring
- Packaged wastewater treatment systems
Industrial Effluent Treatment
- General industrial wastewater treatment
- Textile and dyeing wastewater after collection or pretreatment
- Food and beverage wastewater treatment
- Selected metal-processing wastewater after pretreatment or neutralization
- Selected chemical effluent applications, subject to material compatibility review
Water Treatment and Environmental Monitoring
- General water treatment systems
- Neutralization and chemical dosing systems
- Recirculating water systems
- Surface water monitoring
- pH monitoring upstream and downstream of filtration systems
Agriculture and Aquaculture
- Aquaculture ponds
- Recirculating aquaculture systems
- Irrigation water
- Agricultural water treatment
- Nutrient solution monitoring
OEM and System Integration
The compact sensor body and threaded process connection make the APS21 suitable for integration into:
- pH dosing and neutralization skids
- Water-quality monitoring panels
- Packaged water and wastewater treatment equipment
- General aqueous process monitoring systems
Wastewater pH Monitoring
pH Measurement in Treatment Tank
Immersion pH Sensor Installation
Why Choose This Industrial pH Electrode?
FAQ
The outer body is manufactured from reinforced ABS, but the internal sensing element uses a glass pH-sensitive membrane. The plastic housing provides mechanical protection and installation support; it does not replace the glass sensing membrane.
Yes. The dual 3/4 in. NPT threads support different inline installation arrangements. The sensor should be installed in a location where the glass membrane and ceramic junction remain continuously wetted.
Operating pressure must not exceed the specified process limit.
Yes. The IP68 construction and upper threaded connection allow the sensor to be installed with a suitable immersion holder or mounting pipe.
The electrode must not be suspended directly by the cable.
Yes. Optional temperature elements include NTC 10K, NTC 2.252K, NTC 22K, Pt100 and Pt1000.
The temperature element must match the input specification of the connected pH transmitter.
It is designed for municipal wastewater, general industrial wastewater and water treatment applications.
For wastewater containing strong solvents, concentrated chemicals, oxidizers, abrasive solids or glass-attacking compounds, a detailed compatibility review is required.
Calibration frequency depends on process contamination, required measurement tolerance, electrode aging and process stability.
The interval should be determined from actual calibration drift rather than using one fixed schedule for every application.
Custom cable lengths of up to 60 m may be available. Long cable configurations must be checked against the pH transmitter input and installation environment.
Replacement should be considered when the electrode cannot achieve an acceptable slope, zero point, response time or reading stability after proper cleaning, hydration and recalibration.
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.
