The FE Petro dispenser hook isolation device prevents electrical feedback between dispenser hook circuits as required by most electrical codes.

Order Info
  • Highlights

    • Optically isolates inputs from up to eight dispensers preventing damage to dispenser relay boards caused by cross-phasing.
    • Prevents electrical feedback between dispenser hook circuits during periods of maintenance and service as required by NEC 514-6, 1999 and other international codes.
    • Can be supplied factory-wired in tandem with the FE Petro Smart Controller or the FE Petro standard control box.
    • Eliminates false STP run due to voltage leakage of multiple dispensers connected in parallel.
    • Fuse-protected output to submersible pump controller.
    • The STP-DHI can retrofit to any existing site.
  • Specs

    • Enclosure size: 8½" x 5" x 3" (215 mm x 127 mm x 76 mm).
    • Eight optically isolated inputs from dispenser.
    • One STP-DHI required per product grade for up to eight dispensers.
    • STP-DHI: 120 V 30 V A input from supply, eight 120 V 10mA inputs from dispensers.
    • Output fuse rating: 250 V 1A, fast-acting.
    • 300 Volt surge protection.
    • Maximum ambient temperature rating: 120 °F.
    • LEDs indicate when source power is applied and dispenser hook signals are present.
    • Compatible with any submersible pump controller.


    • Consult factory for applicable approvals.

    Quality Certification

    • Franklin Fueling Systems is an ISO 9001 Certified Manufacturer.
  • Order Info

    Part NumberDescription
    402312921STP-DHI-SCI combo DHI with factory-wired STP-SCI(when purchased with a 4" STP)*
    402312921STP-DHI-SCI, combo DHI with factory-wired STP-SCI(when purchased without a 4" STP)
    402313921STP-DHI-CBS, combo DHI with factory-wired STP-CBS single-phase control box
    5800300100STP-DHI, isolates up to eight, 120 Volt dispenser handles
    • Notes:
    • 1. DHI models are compatible with FE Petro submersible pump controllers and competitive pump controller makes accepting 120 Volt dispenser hook signal.
    • 2. DHI models can be connected together for products with more than eight dispenser handle inputs.
    • *When purchasing STP-DHI-SCI in equal quantities of fixed speed 4" STPs, the STP-DHI-SCI will be invoiced at special discount pricing.

    DHI Repair Parts and Accessories

    Part NumberDescription
    223243103DHI fast-acting fuse, 250 VAC, 1 Amp
    223885901DHI circuit board, 120 Volt dispenser hook signal
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