GE 8421-CC-PS Technical Parameters
1. General Specifications
- Manufacturer: GE Sensing & Inspection Technologies (Now part of Baker Hughes)
- Model: 8421-CC-PS
- Type: Capacitive Proximity Sensor / Level Switch
- Sensing Principle: Capacitive
- Function: Detects the presence or level of liquids, pastes, powders, and granular solids (both conductive and non-conductive) without physical contact.
2. Electrical Specifications
- Supply Voltage: 20 to 253 VAC, 50/60 Hz. (A common variant also exists for 20-140 VDC).
- Output Type: DPDT (Double Pole, Double Throw) Electromechanical Relay.
- This is a critical feature. It provides two isolated sets of Form C (SPDT) contacts that can be wired for either Normally Open (NO) or Normally Closed (NC) operation.
- Relay Contact Rating:
- Resistive Load: 10 A @ 250 VAC / 30 VDC
- Inductive Load (cos φ = 0.4): 5 A @ 250 VAC
- Motor Load: 1.5 HP (1.1 kW) @ 250 VAC
- Power Consumption: Typically < 3.5 VA.
3. Sensing Performance
- Sensing Distance: Up to 30 mm (1.2 inches) from the tank wall. This is the maximum distance at which it can detect a material through a non-metallic tank wall.
- Sensitivity Adjustment: Equipped with a potentiometer for adjusting the sensitivity to compensate for different wall thicknesses, material types, and to avoid false triggering. This allows it to “look through” the container wall and only detect the material inside.
- Response Time: Typically < 150 ms.
- Operating Frequency: Typically 2.5 operations per second.
4. Mechanical & Environmental Specifications
- Housing Material: NEMA 4X, IP67 rated polypropylene housing. This makes it suitable for wash-down environments and resistant to corrosion from many chemicals.
- Process Connection: 1″ NPT male thread.
- Operating Temperature Range: -40°C to +85°C (-40°F to +185°F). This wide range makes it suitable for both freezing and high-temperature industrial environments.
- Storage Temperature Range: -40°C to +100°C.
- Dielectric Strength: 1500 VAC for 1 minute (between live parts and enclosure).
5. Approvals and Certifications
- UL Listed: Recognized under UL 508.
- CSA Certified: Certified under C22.2 No. 14.
- CE Marked: Compliant with European directives.
Key Features and Applications
- Versatile Detection: Can detect virtually any material—water, oil, chemicals, plastic pellets, powder, granules, coffee beans, etc.—through non-metallic walls (plastic, glass, fiberglass).
- No Moving Parts: The sensing element is static, leading to high reliability and long life.
- Relay Output: The robust DPDT relay allows it to directly control pumps, solenoids, valves, and alarms without needing an additional interposing relay.
- Easy Installation: The 1″ NPT thread allows for easy mounting into standard fittings on tanks, hoppers, and silos.
Typical Applications
- High/Low Level Detection in tanks and silos.
- Pump Control (e.g., dry-run protection).
- Overflow/Underflow Prevention.
- Bin and Hopper Level Monitoring.
- Interface Detection between two immiscible liquids.
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GE Company Introduction
General Electric Company (GE) is a renowned multinational conglomerate with diversified businesses spanning energy, aviation, healthcare, renewable energy, and digital industries. Below are its key details:
1. Company Overview
- Founded: 1892 (merger of Edison Electric Light Company and Thomson-Houston Electric Company)
- Headquarters: Boston, Massachusetts, USA
- Founders: Thomas Edison (technical pioneer), Charles Coffin (business integrator)
- Current CEO: Larry Culp (since 2018)
- Market Cap: ~$120 billion (2023 data, adjusted after spin-offs)
2. Core Business Segments
After strategic restructuring, GE now focuses on three main sectors:
- Aviation (GE Aerospace)
A global leader in aircraft engines and systems, including CFM International’s (joint venture with Safran) LEAP engines. - Healthcare (GE HealthCare)
Spun off in 2023, specializing in medical imaging, ultrasound, and life care equipment (e.g., CT, MRI machines). - Energy Transition (GE Vernova)
Launched in 2024, combining renewable energy (wind, hydro), gas power, and grid solutions.
3. Historical Milestones
- Early 1900s: Pioneered electrification, inventing the first commercial incandescent lamp and X-ray machine.
- 1970s: Entered aviation with the GE90 jet engine.
- Post-2008: Restructured after the financial crisis, divesting GE Capital.
- 2015-2020: Pushed digital transformation with the Predix industrial IoT platform.
- 2020s: Spun off non-core assets (e.g., appliances, biopharma) to focus on advanced manufacturing.
4. Presence in China
Since 1906, GE has contributed to projects like the Three Gorges Dam and COMAC C919, with multiple R&D and manufacturing sites (e.g., Beijing, Shanghai, Wuxi).
5. Recent Developments (2023-2024)
- Completed spin-offs of GE HealthCare and GE Vernova, leaving GE Aerospace as the remaining public entity.
- Accelerated sustainable tech R&D, including hydrogen-powered turbines and hybrid-electric aircraft engines.
6. Corporate Culture & Legacy
- Slogan: “Imagination at Work”
- Achievements: Holds numerous Nobel-level innovations and consistently ranks in the FortuneGlobal 500.
Through continuous transformation, GE aims to lead in low-carbon and high-tech industrial solutions.
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