Qualitrol 930 Transformer Pressure Monitoring Device Multi Sensor Pressure Monitor Pressure Alarm Trip Monitor
Qualitrol 930 Series Electronic Pressure Monitor
The Qualitrol 930 Electronic Pressure Monitor is a multi-function instrument that detects dangerous rapid pressure rises as well as slower static pressure increases in transformer and load tap changer tanks. It provides both local indication and remote outputs for alarm, trip, and continuous pressure monitoring.
Product Overview
Electronic sensors convert tank pressure into a continuous signal that is processed by the control module. The system can be set to react to fast pressure events or gradual pressure build-up, with user-adjustable thresholds. Front-panel LEDs indicate the source of actuation, and relays can be configured for momentary or seal-in operation. Continuous 0-1 mA or 4-20 mA outputs allow integration with SCADA systems. Multi-sensor configurations offer logic-based trip decisions that improve reliability and help minimize false operations. The design supports installation in oil or gas compartments and includes options for retrofit to existing mechanical RPRR mounting points.
Technical Specifications
| Specification | Details |
|---|---|
| Product | Qualitrol 930 Electronic Pressure Monitor |
| Pressure Range | 0–30 PSIG (0–2 bar) |
| Detection Types | Fast (rapid) pressure rise and slow (static) pressure |
| Sensor Connection | 1/4"-18 NPT |
| Outputs | SPDT relays (up to 9 in multi-sensor versions) + analog 0-1 mA / 4-20 mA |
| Power Options | Universal AC/DC ranges available |
| Max Sensor Cable | 750 ft (228.6 m) |
| Indicators | LEDs for fast pressure, static pressure, and power status |
| Operating Environment | Suitable for transformer control cabinets and related installations |
Application Industry
Electric utility transformer protection, industrial power systems, and substations requiring reliable detection of sudden or gradual pressure changes in oil- or gas-filled compartments.
Common Problems
Nuisance alarms, lack of continuous pressure feedback, or difficulty adjusting sensitivity are common with older mechanical devices. The 930 series provides adjustable settings, multi-sensor logic, continuous SCADA-compatible outputs, and clear local status indication to improve operational reliability.
Replacement Models
Functions as a direct electronic alternative or upgrade path for Qualitrol 900/910 mechanical rapid pressure rise relays and comparable sudden pressure protection devices.
Why Buy From Us
We offer authentic Qualitrol products with experience supporting transformer monitoring and protection applications.
Stock & Delivery Time
Standard lead time is 6-8 weeks.
RFQ Form
Submit your requirements for sensor configuration, power supply, output type, mounting style, and quantity to receive a detailed quote.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.