Liquid Flow Detection

Reliable Flow Monitoring for Forced Cooling Systems

The Qualitrol liquid flow indicators are designed to monitor oil circulation in transformer cooling systems. With durable construction, flexible installation, and switch options for alarms and control, these indicators help ensure cooling systems operate safely and efficiently.

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Application Overview

The Qualitrol liquid flow indicators are used in cooling systems that rely on forced oil or water circulation and need confirmation of proper flow rate, flow direction, or “pump on/pump off” conditions. They support control circuits, safety interlocks, and alarm triggering where accurate flow monitoring is essential.

What We Solve For

Cooling system failures can cause equipment overheating, reduced efficiency and unexpected outages. Liquid Flow Indicators help prevent these problems by providing:

Clear visibility of flow status
Optional switching for alarms or control
Indication of correct flow direction on select models
Robust construction that maintains performance over time

This ensures safer operation, better protection for critical assets, and fewer maintenance interruptions.

TECHNICAL

Functionality & Options

Switching Options: Up to 2 SPST or SPDT snap‑action switches for alarm and control.
Dial Assembly: Magnetically coupled design allows field replacement without disturbing the sealed flange assembly.
Electrical Connections: Multiple connection types available—ANSI, military, permanent cable, quick‑connects and terminal boxes.
Lens Materials: Available in clear glass, tempered glass, plexiglass or UV‑stabilised polycarbonate.
Adjustable Vane Models: Some models offer adjustable preload springs for field‑tuned switching thresholds.
Pipe Size Flexibility: Can be installed on pipes with inside diameters of 2" to 8".
Sealed or Vented Case Options: Choose based on environmental or system requirements.

Key Technical Specifications

Operating Pressure: Up to 35 psi
Flow Velocity: 100–750 FPM
Ambient Temperature Range: –30 to 140°F (–34 to 60°C)
Meets IP66 (sealed case) or IP54 (vented case) ratings
Switches: Up to 2 SPST or SPDT
AC Rating: 10A @ 125/250/480 VAC
DC Rating: 0.5A @ 125 VDC, 0.25A @ 250 VDC, 1.5A @ 48 VDC (resistive)
Dielectric Strength: 1500 VAC for 1 minute

IMPLEMENTATION

Services & Support

Insulect offers comprehensive services and support for the products we specialise in, enhancing value for local utilities, major energy users, equipment manufacturers, and service operators.

LOCAL TECHNICAL TEAM

Our local technical team provides exceptional support and expertise, ensuring quick response times and personalised service to tackle any challenges that may arise during project execution.

ENGINEERING EXPERTISE

Through Qualitrol, our team utilises advanced technology and industry knowledge to assist customers.

PROCUREMENT & LOGISTICS

We facilitate smooth procurement and logistics processes by sourcing from trusted, proven partners and coordinating timely deliveries, ensuring projects remain on schedule and within budget.