Sherwood
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| Brand | Sherwood |
|---|---|
| Origin | United Kingdom |
| Model | 425 |
| Optical System | Single-beam |
| Detector | Photodiode Array |
| Wavelength Range | 190–900 nm |
| Wavelength Accuracy | ±2.0 nm |
| Wavelength Repeatability | ±0.5 nm |
| Spectral Bandwidth | 4 nm |
| Stray Light | ≤0.01% T |
| Elements Measured | Na, K, Li, Ca |
| Linear Display | Dual-channel Digital LED |
| Output | 0.05–5.0 V Analog Signal |
| Interface | RS232 |
| Fuel Gas | Propane/Butane/Natural Gas (6 L/min at 15 PSI) |
| Detection Limits | Na/K: 20 ppb (S/N = 2) |
| Sensitivity | Na/K: 0.5 ppm |
| Li | 2 ppm |
| Ca | 5 ppm |
| Interference | <0.5% |
| Linearity | <1% |
| Precision (RSD) | ≤0.5% |
| Stabilization Time | ~15 s per reading |
| Brand | Sherwood |
|---|---|
| Origin | United Kingdom |
| Model | M410 |
| Measurement Principle | Emission Spectroscopy (Flame Excitation) |
| Elements Measured | Na, K, Ca |
| Detection Limit | <20 ppb for Na and K |
| Sensitivity | <0.5 ppm for Na and K |
| Linearity | Better than 2% (at 3 ppm for Na/K) |
| Drift | <2% per hour (after 30-min warm-up, 10 ppm Na) |
| Repeatability | <1% RSD (n=20, 10 ppm Na/K) |
| Response Time | Stabilization within 20 s after sample introduction |
| Sample Introduction Rate | 2–6 mL/s |
| Fuel Gas | Propane, butane, or propane/butane mixture at 30 psi |
| Air Supply | Compressed air (included) |
| Gas Regulation | Integrated dual-stage pressure regulator |
| Optical Filters | Interchangeable Na, K, and Ca bandpass filters (front-access, tool-free) |
| Safety Features | Flame-out auto-shutoff solenoid valve, insulated chimney hood |
| Output Signal | 100 mV analog recorder output |
| Display | 3½-digit LED |
| Brand | Sherwood |
|---|---|
| Origin | United Kingdom |
| Model | M410 |
| Element Detection | Na, K, Li, Ca, Ba |
| Output Units | ppm, mg/L |
| Compliance | ISO 7635, ASTM D2189, USP <731> |
| Software Interface | RS-232 serial output for data logging |
| Brand | Sherwood |
|---|---|
| Origin | United Kingdom |
| Model | M420 |
| Channel Configuration | Dual-channel (simultaneous K/Na or Na/Li measurement) |
| Detection Principle | Atomic emission spectroscopy at low-temperature air-propane flame |
| Standard Compliance | GLP-compliant hardware and software architecture |
| Connectivity | RS-232 serial interface, integrated data acquisition module |
| Calibration | Independent channel calibration, built-in linearization for Na >16 ppm |
| Internal Standard | Li reference channel with automatic correction factor calculation |
| Automation Ready | Compatible with Sherwood M805 Auto-Dilutor and M860 Auto-Sampler |
| Safety Features | Flame-out gas shutoff solenoid valve, thermal-insulated chimney hood |
| Filter Access | Front-panel mounted interference filters (Na, K, Li), tool-free replacement |
| Standard Accessories | Integrated dual-stage gas regulator, air compressor, 1000 ppm Na/K/Li stock standards (6 × 100 mL each), 2 m gas/air tubing, needle printer, data acquisition software |
| Brand | Sherwood |
|---|---|
| Origin | United Kingdom |
| Model | M926, M926S |
| Instrument Type | Benchtop Chloride Analyzer |
| Detection Principle | Coulometric Titration (Silver Nitrate Electrolytic Generation) |
| Sample Volume | M926: 500 µL |
| M926S | 20 µL |
| Measurement Range | M926: 10–999 mg/L Cl⁻ (equivalent to 2–165 mg% NaCl) |
| M926S | 10–299 mmol/L Cl⁻ |
| Detection Limit | 10 mg/L Cl⁻ (M926) |
| Response Time | ≤36 s (typical endpoint detection) |
| Accuracy | M926: ±3 mg/L or <1% RSD at 0.1% Cl⁻ |
| M926S | ±2% at 100 mmol/L Cl⁻ |
| Linearity | ≤1% deviation across full range |
| Repeatability (CV, n=20) | <1.5% at mid-range concentration |
| Temperature Control | Integrated ambient-temperature-stabilized cell compartment |
| Compliance | Designed for GLP/GMP environments |