Wilkerson DR1920 Duplex Lift Station Back-Up Pump Controller

DIN-rail backup controller that monitors a high/high-high level switch and starts one or two pumps with adjustable staging and run-on timers when the primary level control fails.

Key advantages

Backup duplex control — starts Pump 1 on alarm, stages Pump 2 after Timer 1, then run-on via Timer 2 after alarm clears.
Impedance switch sense — monitors NO/NC contacts already in the system (closed <500 Ω / open ≥1500 Ω @ 20 kHz) independent of voltage presence.
Dual 10 A Form A relays — plus isolated NPN outputs (30 mA) per pump; reset input.
Wide AC power — 85…250 VAC ±10%, 50/60 Hz, 2 VA; UL/cUL Recognized; 5-year warranty.

Typical applications

Sewage/storm lift stations needing a backup to the primary level controller.
Wet wells where high-high float/switch must force pumps to prevent overflow.
Retrofits that wire in parallel across an existing alarm switch.

Selection guide

Power — 85…250 VAC ±10%, 50/60 Hz, 2 VA.
Alarm inputs — Impedance NO/NC switch input; auxiliary isolated switch or OC NPN; jumper for open- or close-to-alarm.
Outputs — Two NO 10 A Form A relays; two optically isolated NPN (sink/source 30 mA).
Timers — Timer 1 (Pump 2 delay): 2…126 s in 2 s steps; Timer 2 (run time): 5…1,275 s in 5 s steps; binary DIP switches.
Indicators — Pump 1/2 LEDs (green OFF / red RUN).
Enclosure — DIN-rail; ~3.9 H × 4.48 D × 0.87 W in.; plug-in screw terminals.

Common mistakes

Using it as the only primary level controller — it is a backup to high-high alarm.
Mis-setting open-vs-close-to-alarm jumper for the float logic.
Undersizing the 10 A relay contacts for motor starters (use as pilot duty appropriately).
Forgetting periodic exercise via digital/reset inputs.
Automation & control

When to RFQ / what to tell us

Pump starter interface (relay pilot vs OC); voltage.
Float/switch type and open- vs close-to-alarm preference.
Desired Timer 1 / Timer 2 settings; quantity; ship-to.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	31900
Brand	Wilkerson Instrument
Model	DR1920
Product type	duplex lift-station backup pump controller
Supply voltage	85 to 250 VAC ±10%, 50/60 Hz, 2 VA
Output signal	Two NO 10 A Form A relays; two isolated NPN 30 mA
Process connection	DIN-rail mount; plug-in screw terminals
Approvals	UL/cUL Recognized
Notes	Specs from wici.com DR1920 page and DR1920 catalog PDF.

Documents

Wilkerson DR1920 catalog page (PDF)

FAQ

Q: Is this a primary duplex controller? A: No — it is a backup that acts on the high-high alarm when the primary level control fails.

Q: Can it parallel an existing float already wired to 120 VAC? A: Yes — the impedance input is designed to monitor switch state regardless of voltage presence across the contacts (within OEM guidance).

Q: What should I send for a quote? A: Starter interface, switch logic, timer targets, quantity, ship-to. Compatible with systems using Wilkerson DR1920 if you need a drop-in check — we do not claim authorized-dealer status.