Preferred Type: Electronic Ballast (Mandatory)
Electronic ballasts must be used in wastewater treatment plants. Traditional magnetic (inductive) ballasts have been completely phased out.
Advantages:
High energy efficiency: Low self-loss, saving 15%–25% energy compared to magnetic ballasts.
Stable output: Smooth voltage and current, small UV intensity fluctuation, extending lamp life by more than 30%.
Rich functions: Supports dimming / power adjustment, intelligent control, fault protection.
Harsh environment suitability: Wide voltage range, high/low temperature resistance, moisture and corrosion resistance, compact size.
II. Core Matching Parameters (Most Critical)
1. Strictly Match Lamp Specifications
Power matching: Ballast rated power = lamp power (low-pressure / medium-pressure / amalgam lamps must be matched individually).
Current / voltage matching: Output current and open-circuit voltage must comply with lamp specifications.
Lamp type matching:
Low-pressure high-output (LPHO) lamps → dedicated low-pressure ballasts
Medium-pressure (MP) lamps → dedicated medium-pressure ballasts (higher voltage, different topology)
Amalgam lamps → ballasts adapted to amalgam characteristics (special preheating / ignition curve)
2. Ignition Mode (Affects Lamp Life)
Preheat start (recommended):
Protects filaments, extending lamp life by more than 50%.
Ideal for 24-hour continuous operation, high power, frequent on/off scenarios.
Instant start:
Fast ignition, slightly lower cost.
High filament wear, shortened lamp life; only suitable for low-power, infrequent switching.
III. Functional Selection (Essential for Wastewater Treatment)
1. Power Adjustment / Dimming (Core for Energy Saving)
Adjustable power (50%–100%): Automatically reduces power based on flow rate, UVT, and intensity, saving 30%–50% energy.
Control signals: Supports 0–10V, 4–20mA, PLC/DCS communication.
Application: Reduced power under good water quality; energy saving at night / low flow.
2. Protection Functions (Industrial‑grade Required)
Abnormal protection: Lamp short-circuit / open-circuit / overheating / water leakage protection.
Restart: Automatic retry after fault to avoid false shutdown.
Surge / lightning protection: Adapts to grid fluctuations.
Temperature protection: Stable operation from -25°C to 60°C.
3. Monitoring & Communication (Smart Water Plants)
Status feedback: Real-time output of operation / fault / intensity / life / voltage / current.
Communication interfaces: RS485, Modbus, Profibus for SCADA integration.
Fault alarm: Dry contact / audible-visual / remote alarm.
4. Protection & Heat Dissipation (Wastewater Plant Environment)
Ingress protection rating:
Open-channel / module type: IP65 / IP67 (dustproof & moisture-proof)
Submerged type: IP68 (waterproof)
Heat dissipation:
Air cooling (standard)
Water cooling (for high-power / medium-pressure / high-temperature environments)
Material: Corrosion-resistant enclosure and terminals (against H₂S / ammonia corrosion).
IV. Electrical & Performance Specifications
Input voltage: 220V / 380V optional; wide voltage range (90–264V) recommended.
Power Factor (PF): ≥ 0.95 (preferably > 0.98) to reduce grid loss.
Efficiency: ≥ 90% (higher = more energy-saving).
EMC compliance: Meets FCC Part 18, EN 55015 to avoid electromagnetic interference.
Cable distance: Supports 10–20m long-distance driving for easy wiring.
V. Selection Procedure (Summary)
Confirm lamp parameters: type (LP/MP), power, current, voltage, ignition mode.
Choose electronic ballast (reject magnetic ballast).
Match power / current / voltage precisely.
Prefer preheat start to protect lamp life.
Must support dimming (0–10V / 4–20mA / communication).
Ingress protection: IP65+ (humid / corrosive environment).
Communication: support remote monitoring and intelligent control.
Brand & certification: professional UV brands with CE / UL / RoHS certificates.
VI. Common Mistakes
Using ordinary lighting ballasts: mismatched parameters, no protection, short life, low efficiency.
Over/under power rating: burns filaments or causes insufficient intensity.
No dimming function: full power year-round, high energy consumption, fast lamp aging.
Low protection rating: failure within 1–2 years in moist, corrosive wastewater plant environment.
