Saprete SPT-H Nitrogen Evaporator (Nitrogen Blow-Down Concentrator)

Overview

The Saprete SPT-H Nitrogen Evaporator is a precision-engineered laboratory instrument designed for the gentle, reproducible concentration of volatile organic compounds (VOCs) and analytes in liquid samples prior to chromatographic or mass spectrometric analysis. It operates on the principle of controlled nitrogen gas stream impingement over sample surfaces immersed in a thermostatically regulated water bath — a method widely adopted in environmental, food safety, pharmaceutical, and forensic laboratories for solvent removal without thermal degradation. Unlike dry-block or air-based concentrators, the SPT-H’s water-bath heating system ensures uniform thermal transfer and minimizes temperature gradients across sample positions, critical for maintaining analyte integrity during evaporation. Its dual-gas-channel architecture enables parallel processing of heterogeneous sample sets under distinct flow conditions, while the ±1 °C temperature stability meets routine QC requirements aligned with ISO/IEC 17025-compliant workflows.

Key Features

• Intuitive 7-inch capacitive touchscreen interface with multilingual support (English, Spanish, Chinese), enabling real-time parameter adjustment and protocol recall.
• Dual independent nitrogen supply channels — each with digital mass flow control (0–12 L/min range) and individual on/off solenoid valves — allowing simultaneous optimization for high-volatility and low-volatility analytes.
• Auto water-level management system: integrated level sensors trigger automatic fill/drain cycles; dry-burn protection cuts power if water volume falls below operational threshold.
• 360° motorized rotation of the sample rack eliminates tubing entanglement and permits unobstructed visual monitoring of all vials or conical flasks during evaporation.
• Uniform gas distribution manifold with calibrated stainless-steel needles ensures consistent laminar flow across all positions — no cross-contamination or channel-to-channel variability.
• Modular sample block design supports interchangeable configurations: standard 24-position (10–20 mm OD tubes) or compact 8-position layout optimized for larger vessels (50–100 mL conical flasks).

Sample Compatibility & Compliance

The SPT-H accommodates a broad range of container formats, including round-bottom and flat-bottom test tubes (10–20 mm outer diameter), culture tubes, and borosilicate conical flasks (50–100 mL). Its water-bath geometry allows stable immersion of up to 50 mm depth, ensuring consistent thermal coupling regardless of vessel height. The system complies with general laboratory safety standards (IEC 61010-1) and incorporates electrical isolation and ground-fault circuit interruption. While not certified for Class I Div 1 hazardous locations, it is routinely deployed in ISO 17025-accredited labs for EPA Method 502.2, 525.3, and 8270D sample preparation. All firmware logs timestamped operational events (start/stop, temperature setpoint changes, gas flow adjustments) — supporting GLP/GMP traceability when paired with validated LIMS integration.

Software & Data Management

The embedded controller stores up to 100 user-defined methods with full parameter logging (temperature, flow rate, duration, position status). Data export is supported via USB flash drive in CSV format, compatible with common laboratory informatics platforms. Optional Ethernet connectivity (via RS485-to-Ethernet converter) enables remote monitoring and centralized fleet management in multi-instrument environments. Audit trail functionality records operator ID (if enabled via external LDAP), method execution history, and calibration event timestamps — satisfying FDA 21 CFR Part 11 requirements when deployed with electronic signature validation protocols.

Applications

• Pre-concentration of pesticide residues in drinking water (per EPA 525.3)
• Trace-level PAH recovery from soil extracts prior to GC-MS analysis
• Drug metabolite isolation in biofluids (plasma, urine) for LC-MS/MS quantitation
• Volatile flavor compound enrichment in beverage matrices (e.g., beer, wine)
• Residual solvent removal in API purification workflows under cGMP conditions
• Environmental monitoring of PCBs and dioxins in sediment extracts

FAQ

Is the SPT-H compatible with inert gas sources other than nitrogen?
Yes — the system accepts argon, helium, or compressed air provided gas pressure is regulated between 0.2–0.6 MPa and particulate/moisture filtration is implemented upstream.
Can the instrument be integrated into automated sample preparation lines?
It supports basic PLC-level handshaking via dry-contact I/O (start/stop, ready signal); full robotic arm coordination requires custom API development using Modbus RTU over RS485.
What maintenance intervals are recommended for long-term reliability?
Daily visual inspection of needle tips and O-rings; quarterly calibration of temperature sensor and flow meter against NIST-traceable references; annual replacement of water bath heater element if usage exceeds 2,000 hours.
Does the SPT-H meet regulatory requirements for pharmaceutical QC labs?
While not pre-certified for 21 CFR Part 11, its audit trail, method locking, and electronic signature readiness enable qualification per IQ/OQ/PQ protocols when validated on-site by the end user.
How is temperature uniformity verified across the water bath?
Saprete provides a factory verification report (per ASTM E2251) showing ≤±0.8 °C deviation at 40 °C across all 24 positions using nine calibrated PT100 probes — available upon request with serial-number-matched documentation.