Overview
The Parker HBSR-SSR-1/IP-NC-2 is a solid-state level switch engineered for low-temperature ammonia and refrigerant detection in industrial refrigeration systems. Built-in condensation protection and electronic output make this switch ideal for freezer units, outdoor installations, and critical refrigerant control applications. The normally closed (NC) configuration switches to open when liquid is detected, providing reliable status indication with minimal response time.
Key Features
- Built-in heater — Prevents condensation and ensures reliable sensing in sub-zero environments
- Solid-state electronic output — 1A solid state relay with LED indication for visual confirmation
- Wide temperature range — Operates from -60°C to 30°C (-76°F to 86°F) without performance degradation
- High-pressure rated — 100 bar (1450 psi) maximum working pressure for industrial refrigeration duty
- Split design — Allows mounting and testing without refrigerant loss or system drainage
- IP66 protection — Sealed against water ingress and harsh environmental conditions
Technical Specifications
- Output Type: Normally Closed (NC), Solid State
- Power Supply: 24V AC/DC
- Maximum Current: 1A
- Liquid Temperature Range: -60°C to 30°C (-76°F to 86°F)
- Maximum Pressure: 100 bar (1450 psi)
- Connection: 3/4″ NPT with union fitting
- Protection Rating: IP66
- Detection Medium: NH3 (Ammonia), Brine
- Mounting: Threaded NPT port with split-body design
Typical Applications
- Ammonia refrigeration system liquid level control
- Freezer unit level monitoring and pump protection
- Refrigerant supply management to economizers and heat exchangers
- Hot gas defrost cycle control and liquid drainage management
- Outdoor and low-temperature industrial refrigeration installations
- Pump separator and receiver tank level supervision
Compatibility & Replacements
Compatible With
- Parker refrigeration level switch mounting blocks and manifolds
- Industrial refrigeration control systems using 24V AC/DC supply
- Ammonia (NH3) and brine refrigerant systems
- Rockwell and Siemens PLC monitoring via simple relay or solid-state input modules
Replaces / Drop-In Replacement For
- Parker HBSR-SSR-1/IP-NO-2 (identical unit with NO contact configuration)
- Supersedes earlier Parker HBSR liquid level switch models without condensation protection
Works With
- 24V DC input modules (Allen-Bradley CompactLogix, Siemens S7-1200/1500)
- Solid-state relay monitoring and PLC logic
- Standard refrigeration BMS (Building Management Systems)
- Industrial control networks via simple discrete input signals
