Quarter-turn valve limit switch box Noah NLB

for quarter-turn actuatorswith aluminum housingwith stainless steel housing

Product overview
The Rotork Noah NLB range includes three variants: NLB1, NLB2 and NLB3. These are limit switch boxes designed to provide reliable valve position monitoring and signalling for rotary motion actuators. The range delivers 360º visual position indication, multiple electrical output options, universal actuator mounting compatibility and straightforward, tool-free configuration to support dependable valve monitoring in a variety of applications.

Key features

• Visual position indication: 360º viewing angle for clear, real-time status
• Multiple output signals: Terminal port with 8 or 12 contacts
• Universal compatibility: Suitable for all rotary motion actuators (ISO 5211 standard)
• Easy configuration: Simple cam position adjustment, no tools required
• Two cable inlets: Separate entries for power and signal cables (cable entry sizes differ by model)
• Switch options: Mechanical switch or proximity sensor; non-contact switch available for enhanced reliability and accuracy
• Ingress protection: IP67 standard across models; IP68 available for stainless steel versions of NLB1 and NLB3
• Operating temperature: NLB1 and NLB2: –20 to +80 °C (–4 to +176 °F); NLB3: –20 to +60 °C (–4 to +140 °F)

Variants

• NLB1: Aluminium or stainless steel construction; optional IP68; suitable for general applications
• NLB2: Aluminium construction with a wider selection of switch options for additional signalling flexibility
• NLB3: Aluminium or stainless steel construction with hazardous area certifications (ATEX, IECEx and other country-based hazardous area approvals pending)

Certifications and approvals

• NLB1 and NLB2: designed for standard safe area applications
• NLB3: hazardous area certifications pending (ATEX, IECEx and other country-based hazardous area approvals)

Applications
Limit switch and position transmission for rotary valve actuators across industrial sectors where clear visual indication, robust environmental protection and flexible signalling outputs are required.

Technical specifications

• Visual indication: 360º
• Output contacts: Terminal port options with 8 or 12 contacts
• Mounting standard: ISO 5211 (universal rotary actuator compatibility)
• Configuration: Tool-free cam position adjustment
• Cable entries: Two separate inlets (power and signal); sizes vary by model
• Switch types: Mechanical switch, proximity sensor, optional non-contact switch
• Ingress protection: IP67 standard; IP68 optional for stainless steel NLB1 and NLB3
• Operating temperature: NLB1 & NLB2: –20 to +80 °C (–4 to +176 °F); NLB3: –20 to +60 °C (–4 to +140 °F)
• Materials: Aluminium or stainless steel options depending on variant
• Certifications: NLB3 – hazardous area certifications (ATEX, IECEx and others) pending; NLB1/NLB2 – for standard safe area applications