SFP120A250 Macromatic Protection Relays, SFP Series

• Monitors Submersible Pump Seals and Leakage
• Single or Dual Channel for Monitoring 1 or 2 Pumps
• Three Adjustable Sensitivity Ranges

SFP 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. If the seal starts to leak, contaminating fluid enters the seal cavity, lowering 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 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.

• Optional Fixed Sensitivity Setting Available
• Optional Low‑Profile Adjustment Knob
• Uses industry‑standard 8 & 11 pin octal sockets