KNF SH 840 G LaboPort® Chemical-Resistant Diaphragm Vacuum Pump System

Overview

The KNF SH 840 G LaboPort® is a fully integrated, oil-free diaphragm vacuum system engineered for demanding laboratory applications involving aggressive vapors, condensable solvents, and chemically corrosive gases. Unlike conventional rotary vane or scroll pumps, the SH 840 G employs a robust, multi-stage PTFE-coated diaphragm mechanism with chemically inert wetted materials—including FKM (Viton®) and EPDM elastomers—ensuring long-term stability when exposed to halogenated solvents, acids, bases, and organic vapors. Its design follows the fundamental principle of positive displacement via oscillating diaphragms, delivering consistent vacuum performance without lubricant contamination or hydrocarbon backstreaming. The system operates across a wide pressure range—from atmospheric down to 6 mbar (absolute)—and is uniquely capable of initiating operation directly at ultimate vacuum, eliminating the need for pre-evacuation or manual venting. This feature significantly enhances process safety and repeatability in solvent-intensive workflows such as rotary evaporation and fractional distillation.

Key Features

• Integrated inlet separation bottle and high-efficiency outlet condenser for >95% solvent recovery under typical rotary evaporation conditions
• Built-in gas ballast valve enabling continuous operation during high-vapor-load processes without performance degradation
• Microprocessor-controlled variable-speed motor (0–100% RPM), allowing precise vacuum setpoint regulation and energy optimization
• Three-color status LED (green = operational, yellow = standby/idle, red = fault alert) with real-time diagnostics accessible via front-panel interface
• Compact footprint (340 × 416 × 274 mm) and low acoustic emission (<52 dB(A)) suitable for shared lab environments and fume hood integration
• Self-contained architecture requiring no external cooling water, compressed air, or oil management infrastructure

Sample Compatibility & Compliance

The SH 840 G is validated for use with Class II and III solvents per ISO 8573-1:2010 (compressed air purity classes) and conforms to IEC 61000-6-3 (EMC emissions) and IEC 61000-6-2 (immunity). Its chemically resistant fluid path meets ASTM D471 requirements for elastomer compatibility with organic solvents and is routinely deployed in GLP-compliant laboratories performing USP vacuum drying and EP 2.2.27 distillation protocols. The pump’s dry-running design eliminates risk of sample cross-contamination and supports FDA 21 CFR Part 11–aligned workflows when paired with compliant data acquisition software. No hazardous waste generation occurs during normal operation—fully aligning with ISO 14001 environmental management principles.

Software & Data Management

While the SH 840 G operates autonomously via its embedded controller, optional analog (0–10 V) and digital (RS-485 Modbus RTU) interfaces enable seamless integration into centralized lab automation platforms. When connected to KNF’s LaboPort® Control Suite (v3.2+), users gain access to audit-trail-enabled logging of vacuum setpoints, runtime hours, temperature trends, and fault history—meeting ALCOA+ data integrity criteria. All configuration changes are timestamped and user-logged, supporting full traceability for regulatory inspections. Remote monitoring via Ethernet/IP is supported through third-party SCADA systems compliant with OPC UA standards.

Applications

• Rotary evaporation of acid-sensitive compounds (e.g., trifluoroacetic acid, nitric oxide donors)
• Short-path and Kugelrohr distillation of thermally labile pharmaceutical intermediates
• Vacuum filtration of aggressive slurries containing chlorinated solvents or metal halides
• Multi-station vacuum manifolds serving up to four simultaneous users with independent pressure control
• Glovebox purge cycles requiring rapid, oil-free evacuation to sub-10 mbar levels
• Lyophilization pre-chamber evacuation where condensable vapor load exceeds 5 g/h

FAQ

Can the SH 840 G handle hydrogen chloride (HCl) vapor continuously?
Yes—the wetted components (diaphragms, valves, seals) are rated for continuous exposure to anhydrous HCl at concentrations up to 100 ppm and temperatures ≤40°C per KNF Material Compatibility Guide Rev. 2023.
Is solvent recovery efficiency affected by ambient temperature?
Condenser performance declines above 30°C ambient; KNF recommends installing the system in climate-controlled labs (15–25°C) or adding optional chilled-water jacketing for sustained >90% recovery with acetone or ethyl acetate.
Does the pump require periodic maintenance beyond filter replacement?
No scheduled diaphragm or valve replacement is required within the first 10,000 operating hours; KNF provides predictive maintenance alerts via firmware updates based on motor current profiling and thermal drift analysis.
How does the gas ballast valve function during rotary evaporation?
It introduces a controlled bleed of ambient air into the compression chamber, lowering partial pressure of condensables and preventing liquid lock—enabling uninterrupted operation even during high-boiling-point solvent removal.
Can the SH 840 G be used in explosion-proof environments?
Not natively; however, KNF offers ATEX-certified variants (SH 840 G-ATEX) with intrinsically safe electronics and spark-resistant housings for Zone 2/22 installations.