Air System Products Low Pressure Robo-Drain w/ High-Level Alarm (RD11-LP-T-A)

RD11-LP-T-A Robo-Drain – External Pneumatic, Low-Pressure (40 PSI) Condensate Drain with High-Level Alarm

The RD11-LP-T-A delivers the same zero-loss, fully automatic condensate removal as the RD11-LP—no electricity required for the drain itself—plus an integrated high-level alarm that alerts you if condensate rises above the normal operating point. It’s built for plants that only have low-pressure (40 PSI) control air available and want positive notification to prevent carryover, nuisance shutdowns, and water in downstream equipment. A translucent reservoir provides quick visual checks, and it pairs cleanly with oil/water separators for compliance and efficiency.

RD11-LP-T-A Specifications

• Inlets: (2) 3/4" NPT (BSPP available)
• Outlet: 1/2" NPT (BSPP available)
• Control Air (Power): Clean, dry compressed air, 40 PSI nominal (Low Pressure)
• Operating Line Pressure Range: 0–250 PSI
• Operating Temperature: 32°–180°F
• Discharge Volume: 24 oz per cycle
• Weight: 17 lb
• Alarm: Integrated high-level alarm output for remote notification (wire to your PLC/BMS/beacon; see datasheet for electrical details)
• Orientation: Horizontal, low-profile

Key Features

• Zero-loss, fully automatic pneumatic drain—no manual draining
• High-level alarm gives early warning of abnormal fill conditions
• 40 PSI control-air actuation for sites without standard pilot pressure
• Isolated trigger assembly for dependable, repeatable cycling
• Non-clogging, full-port drain valve handles rust and scale
• Translucent reservoir for at-a-glance inspection
• Heavy-duty construction for long service life
• NPT or BSPP connections for flexible installs
• Low-profile body fits under tight skids and receivers

Benefits

• Alarm reduces surprise carryover and unplanned downtime
• Reliable, contamination-resistant design lowers maintenance hassle
• One unit can serve multiple points, cutting air loss and operating cost
• Quick visual checks; no wiring to operate the drain (alarm wiring optional)
• On-demand operation prevents unnecessary cycling

How It Works

Condensate enters through either 3/4" inlet. As the reservoir fills, a stainless-steel float reaches a set point and the magnetic trigger routes 40 PSI control air to open the full-port drain valve, discharging condensate with zero compressed-air loss. If the liquid level rises beyond the normal cycle threshold, the high-level alarm switch changes state to signal your panel or beacon. When the reservoir empties, the valve closes and the unit returns to collection mode.

Construction Materials

• Reservoir: Aluminum & composite
• Valve: Bronze with stainless-steel ball and stem
• Float: Stainless steel
• Seat: Stainless steel
• Seals: Viton®

Bottom line: RD11-LP-T-A gives you the proven Robo-Drain performance with low-pressure control air and built-in high-level alarm—a straightforward way to add protection and visibility to your condensate management.