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Series-SLD
Single Channel Leak Detection Relay for Pumps - Monitors Seals, Alarms
Product Overview
- Control Mode On/Off
- Input Type Resistance
- Isolation 2500 V
- LED Indicators Red LED Illuminates when Leak is Detected
- Materials Polycarbonate
- Mounting 11-pin socket
- Operating Temperature, Max 131 °F
- Operating Temperature, Min -4 °F
- Power Consumption 2 VA
- Response Time Energize: 15 ms, Release: 8 ms
- Series ID Series-SLD
- Storage Temperature, Max 185 °F
- Storage Temperature, Min -40 °F
- Supply Power Type AC
- Supply Voltage 120 Vac
- Switch Activation Falling
- Switch Note 10 A @ 250 VAC resistive, 360 VA inductive
- Switch Rating 10 A @ 250 Vac, 360 VA
- Switch Type DPDT
- Switching Voltage 9 Vdc
- Weight 8 oz
Supported Applications
The Dwyer Series SLD is a single-channel leak detection relay designed to monitor the shaft seal of submersible pump motors. The unit detects leaks by sensing the status of a resistive float switch or conductivity switch installed in the pump's seal cavity. When resistance drops below the configured sensitivity rating, the output relay energizes and an indicator illuminates to signal a fault condition.
Operating Conditions & Performance
The Series SLD operates within ambient temperature limits of -4 to 131°F (-20 to 55°C) with storage temperatures ranging from -40 to 185°F (-40 to 85°C). The unit is powered by a 120 VAC, 50/60 Hz supply and consumes approximately 2 VA. Performance specifications include an isolation voltage of 2500 V and response times of approximately 15 ms for energize and 8 ms for release.
The relay output is rated at 10 A @ 250 VAC resistive or 360 VA inductive, with a switch type designated as DPDT. The unit features an excitation voltage of 9 VDC for the sensing circuit.
Configuration Options
The series offers three distinct sensitivity configurations to accommodate different seal cavity monitoring requirements:
- SLD-ACX: Fixed sensitivity at 470 Ω.
- SLD-ACY: Adjustable sensitivity from 470 to 10 K Ω.
- SLD-ACZ: Adjustable sensitivity from 4.7 k to 100 K Ω.
The relay provides normally open and normally closed contacts, allowing the unit to energize an alarm or de-energize a pump upon leak detection. A red LED indicator illuminates when a leak is detected. The enclosure includes a polycarbonate dust cover and mounts via an 11-pin socket connection.
Key Product Differences
The primary distinction between Series SLD models lies in the resistance sensitivity range required for the specific float or conductivity switch application. While all units share identical power requirements, response times, and physical dimensions (3 in height x 2-3/8 in width x 1-3/4 in depth), they differ by their internal threshold settings.
The SLD is not field serviceable; repair requires returning the unit to customer service. Agency approvals for the series include cUR, UR, and UL 508.
PDFs & Manuals
