ESICO 381 & 391 Digital Flame Photometers
ESICO Digital Flame Photometers | Models 381 & 391
ESICO Digital Flame Photometers combine precision engineering with user-friendly operation for accurate elemental analysis in laboratory settings. Available in two specialized models, these instruments provide reliable determination of Sodium (Na), Potassium (K), Calcium (Ca), and Lithium (Li) concentrations across soil science and clinical applications. With their advanced optical systems, stable flame technology, and digital displays, ESICO flame photometers deliver consistent performance for research facilities, soil testing laboratories, and clinical diagnostic centers.
Key Features & Benefits
- Specialized Model Options - Choose between Model 381 for soil testing or Model 391 for clinical dual-channel analysis
- Precise Elemental Analysis - Accurate determination of Na, K, Ca, and Li (Li optional)
- Dual-Channel Capability - Model 391 allows simultaneous Na and K measurement with single aspiration
- Advanced Optical System - Narrow band interference filters for specific wavelength isolation
- Stable Flame Technology - Specially designed mixing chamber ensures consistent flame characteristics
- Silicon Photodiode Detection - High-sensitivity light detection for accurate readings
- Concentric Non-Corrosive Nebulizer - Precise sample atomization with resistant materials
- Automatic Ignition System - One-touch flame ignition for operational convenience
- Clear Digital Display - Bright red LED readout shows results directly in ppm or meq values
- Oil-Free Air Compressor - Integrated regulator maintains stable airflow for consistent results
- LPG Gas Operation - Controlled by precision regulator for flame stability
- Rapid Warmup - Operational within just 10 minutes
- Comprehensive Warranty - 1-year manufacturer's warranty for reliability and peace of mind
Model Comparison
| Feature |
Model 381 |
Model 391 |
| Primary Application |
Soil Testing Labs |
Clinical Laboratories |
| Measurement System |
One element at a time |
2 elements on dual LED display |
| Display Type |
2½ digit bright red LED display |
Dual 2½ digit bright red LED display |
| Sample Types |
Soil extracts, water samples |
Blood serum (plasma), urine, biological fluids |
| Channels |
Single channel |
Dual channel (simultaneous Na & K) |
Technical Specifications
Measurement Ranges
| Element |
Model 381 (ppm) |
Model 391 (meq/l) Serum |
Model 391 (meq/l) Urine |
| Sodium (Na) |
0-100 ppm |
0-200 meq/l |
0-200 meq/l |
| Potassium (K) |
0-100 ppm |
0-10 meq/l |
0-100 meq/l |
| Calcium (Ca) |
15-100 ppm (Optional) |
- |
0-10 meq/l (Optional) |
| Lithium (Li) |
10-100 ppm (Optional) |
0-2 meq/l |
- |
Performance Specifications
| Parameter |
Model 381 |
Model 391 |
| Sensitivity |
Na: 5 ppm
K: 5 ppm
Ca: 10 ppm (Optional)
Li: 10 ppm (Optional) |
Same as Model 381 |
| Accuracy |
±2% up to 40 ppm
±5% above 40 ppm |
±2% up to 100 meq
±5% above 100 meq |
| Repeatability |
± 2 Counts |
± 2 Counts |
| Warm-up Time |
10 minutes |
10 minutes |
| Detector |
Silicon Photodiode |
Silicon Photodiode |
| Filters |
Narrow band interference glass filters |
Narrow band interference glass filters |
| Nebulizer |
Black bakelite, axial flow type |
Black bakelite, axial flow type |
| Ignition System |
In-built electronic ignition by press of a switch |
In-built electronic ignition by press of a switch |
Physical & Electrical Specifications
| Parameter |
Main Unit (Both Models) |
Compressor Unit (Both Models) |
| Dimensions (L×B×H) |
375 × 245 × 220 mm (Approx.) |
290 × 255 × 210 mm (Approx.) |
| Weight |
7.5 Kg. (Approx.) |
8 Kg. (Approx.) |
| Power Supply |
230 V ± 10% AC, 50 Hz |
| Flame System |
LPG & dry oil-free air |
| Air Supply |
By oil-free mini compressor unit with pressure regulator |
| Gas Control |
LPG controlled by precision regulator |
Working Principle ESICO 381 & 391 Digital Flame Photometers
ESICO Digital Flame Photometers operate on the principle of flame emission spectroscopy:
- Sample Atomization - Air at regulated pressure passes into the atomizer, creating suction that draws the sample solution into the nebulizer
- Flame Excitation - The nebulizer sprays the sample as a fine mist into the flame, where the heat excites the metal elements
- Light Emission - Excited metal atoms emit light at characteristic wavelengths specific to each element (Na, K, Ca, Li)
- Wavelength Isolation - Narrow band interference filters mounted on a rotating disc isolate the specific wavelengths of interest
- Detection - The filtered light falls onto a sensitive silicon photodiode detector
- Signal Processing - The photodiode output undergoes signal conditioning and digital conversion
- Display - Results are displayed directly in concentration units (ppm or meq) on the digital LED display
Model 381: Soil Testing Applications ESICO 381 & 391 Digital Flame Photometers
The Model 381 Digital Flame Photometer is specifically designed for soil testing laboratories and environmental analysis. Its key features include:
- Soil Nutrient Analysis - Precise measurement of essential plant nutrients (Na, K, Ca)
- Water Quality Testing - Determination of metal ion concentrations in water samples
- Agricultural Research - Support for studies on soil composition and fertility
- Environmental Monitoring - Analysis of metal elements in environmental samples
- Single-Element Display - Clear presentation of one element at a time for focused analysis
- PPM Measurement Range - Concentration display in parts per million for soil science applications
Model 391: Clinical Applications ESICO 381 & 391 Digital Flame Photometers
The Model 391 Dual Channel Clinical Flame Photometer is optimized for medical laboratories and clinical diagnostics. Its specialized features include:
- Dual-Channel Analysis - Simultaneous observation of Sodium and Potassium from a single sample aspiration
- Clinical Sample Compatibility - Designed for blood serum (plasma), urine, and other biological fluids
- Electrolyte Monitoring - Critical for diagnosis and management of various medical conditions
- Meq/L Measurement Units - Results displayed in milliequivalents per liter for clinical relevance
- Dual Digital Display - Shows Na and K concentrations simultaneously for efficient workflow
- Different Range Settings - Optimized for typical concentrations in serum versus urine samples
Technical Advantages
Optical System ESICO 381 & 391 Digital Flame Photometers
- Narrow Band Interference Filters - Precisely isolate specific wavelengths for each element
- Silicon Photodiode Detector - Offers high sensitivity and stability for accurate measurements
- Rotating Filter Disc - Easy thumb operation for quick element selection
Flame System ESICO 381 & 391 Digital Flame Photometers
- Specialized Mixing Chamber - Designed for flame stability and consistent performance
- Concentric Nebulizer - Non-corrosive construction for durability and reliable sample atomization
- Automatic Ignition - One-touch operation for convenience and safety
- LPG Compatibility - Uses widely available liquefied petroleum gas with precision control
Air Supply System
- Oil-Free Compressor - Provides clean air without contaminants
- Integrated Pressure Regulator - Maintains consistent airflow for stable flame conditions
- Separate Compressor Unit - Reduces vibration effects on the measurement system
Setup & Operation ESICO 381 & 391 Digital Flame Photometers
ESICO Digital Flame Photometers feature a two-unit design for optimal performance:
- Main Unit - Houses the digital display, detector, filters, and nebulizer components
- Compressor Unit - Contains the oil-free air compressor and pressure regulation system
- Simple Setup - Connect the compressor unit to the main unit, attach gas supply, and power on
- Quick Start - Ready for operation after just 10 minutes of warm-up time
- Filter Selection - Rotating thumb-operated disc for easy switching between elements
- Easy Ignition - Press-button electronic ignition system for safe flame starting
Related Products ESICO 381 & 391 Digital Flame Photometers
ESICO offers additional flame photometer models with expanded capabilities:
- Microprocessor Flame Photometer Model 381 - Advanced version with microprocessor control
- Microprocessor Flame Photometer Model 391 - Microprocessor-controlled clinical version
- Microprocessor Flame Photometer Model 1381 - Enhanced features for specialized applications
- Microprocessor Flame Photometer Model 1382 - Premium model with advanced functionality
About ESICO ESICO 381 & 391 Digital Flame Photometers
ESICO (Environmental and Scientific Instruments Co.) manufactures a comprehensive range of laboratory and analytical instruments including:
- Semi-Auto Analyzers
- UV/VIS Spectrophotometers
- pH, Conductivity, and TDS Meters
- DO and Salinity Meters
- Turbidity Meters
- KF Titrimeters
- Water & Soil Analysis Kits
- Colony Counters
- Pharmaceutical Testing Equipment
Summary ESICO 381 & 391 Digital Flame Photometers
ESICO Digital Flame Photometers Models 381 and 391 provide reliable, accurate elemental analysis for soil testing and clinical laboratories. With their specialized design features, these instruments offer the precision needed for determining Sodium, Potassium, Calcium, and Lithium concentrations across a variety of sample types. Their combination of optical quality, flame stability, and user-friendly operation makes them valuable tools for agricultural research, environmental monitoring, and clinical diagnostics.
