SFF Series

SFF024C100

Lead Time: 7 Days

$260.57 (USD) / EACH

Description Of Function

SF Series Pump Seal Failure Relays are designed to monitor the shaft seals of submersible pumps. A resistive-measuring probe is installed in the pump seal cavity. With input voltage applied, the LED is Green ON. If the seal starts to leak, contaminating fluid enters the seal cavity, which lowers the resistance between the internal probe & the common connection. When the resistance drops below the user-adjustable sensitivity set-point of the relay, the output relay energizes & the LED turns Red ON. The relay output can be used to give an alarm indication of a leaking seal. These products will automatically reset when the fault condition clears. Probes are pulsed with a DC voltage to prevent electroplating.

Function Chart

function chart

Product Overview

Features
  • Monitors Submersible Pump Seals for Leakage
  • Two Adjustable Sensitivity Ranges
  • Full Status Indication on Top of Unit for Easy Troubleshooting
  • Low-Profile Adjustment Knob
  • 8 Pin Back-Mounted Socket Provided with Relay
Enclosure Style

Flange-enclosure designed for deadfront door-mounting

Configuration / Contact Rating
  • 8 Pin Single Channel: SPDT 10A @ 240V AC/7A @ 28V DC
  • 8 Pin Dual Channel: (2) SPNO 5A @ 240V AC/28V DC
Application Information
  • Voltage Tolerance: AC Operation: +10/-15% of nominal at 50/60 Hz.
  • Load (Burden): 3 VA
  • Indicator LEDs: Green ON with input voltage applied; Red ON when seal leak detected & relay is energized.
  • Probe Voltage: 5V DC Pulsed
  • Response Time: Pick-up & Drop-out: 1 Second
  • Output Contacts:
    • Single Channel Models: 10A @ 240V AC/7A @ 28V DC, 1/4HP @ 120V AC (N.O.)
    • Dual Channel Models: (2) 5A @ 240V AC/28V DC, 1/4HP @ 120V AC (N.O.)
  • Life: Mechanical: 10,000,000 operations; Full Load: 100,000 operations
  • Temperature: -28° to 65° C (-18° to 149° F)
Approvals

Operation

Two wires from the relay are connected to a resistance-sensing probe in the pump seal cavity and the grounded motor housing or across two probes to monitor for seal leakage using a low-voltage DC signal. If the seal starts to leak, contaminating fluid enters the seal cavity.  This lowers the resistance between the internal probe and the common connection.  When the resistance drops below the user-adjustable sensitivity set-point of the relay, the output relay energizes and the LED turns Red ON.  The relay output can be used to give an alarm indication of a leaking seal. 

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