Digital pH Conductivity and Temperature Meter 181

Digital pH Conductivity and Temperature Meter 181

Digital pH, Conductivity & Temperature Meter 181: Integrated Multi-Parameter Laboratory Analyzer

The Digital pH, Conductivity & Temperature Meter Model 181 is an elegant, rugged, and economical instrument designed for fast and accurate measurement of three critical parameters in a single device. This versatile laboratory analyzer delivers precise readings for pH, conductivity, and temperature in natural water, sea water, drinking water, treated water, wastewater, brine solutions, soil, and various chemical solutions.

Key Features & Benefits Digital pH Conductivity and Temperature Meter 181

• Triple Parameter Measurement - Combines pH, conductivity, and temperature testing in one economical instrument
• High Precision pH Analysis - Full range coverage (0-14 pH) with 0.01 pH resolution and accuracy
• Reliable Conductivity Testing - Dual-range measurement up to 20 ppt with ±0.5% accuracy
• Accurate Temperature Monitoring - 0-100°C range with 0.1°C resolution using precision RTD (PT-100) sensor
• Crystal Clear Display - 3½ digit, seven-segment bright red LED display for excellent visibility
• Advanced Electronic Design - Solid-state IC circuitry ensures reliability and consistent performance
• Temperature Compensation - Manual adjustment for pH (0-100°C) and conductivity (0-50°C)
• High Input Impedance - >10¹² ohms for accurate pH measurement without sample disturbance
• Customizable Settings - Adjustable slope correction (80-120%) for pH and cell constant (0.2-1.8) for conductivity
• Built-in Oscillator - Integrated 1 kHz oscillator for conductivity measurement
• Durable Construction - Robust design for long-term laboratory use
• Standard Power Supply - Operates on 220V AC ±10%, 50 Hz

Technical Specifications Digital pH Conductivity and Temperature Meter 181

General Specifications
Display	3½ digit LED
Power Supply	220V AC ±10%, 50 Hz
Dimensions	75 x 175 x 275 mm (L x B x H) (Approx.)
Weight	2.5 Kg (Approx.)
pH Measurement Specifications
Range	0 to 14 pH
Resolution	0.01 pH
Accuracy	0.01 ± 1 Digit
Input Impedance	> 10¹² ohms
Temperature Compensation	0 to 100°C (Manual)
Slope Correction	80 to 120%
Conductivity Measurement Specifications
Range	0 to 20 ppt (2 ranges)
Resolution	1 ppt
Accuracy	± 0.5% of Range ± 1 digit
Oscillator	1 kHz in-built
Cell Constant	0.2 to 1.8 adjustable directly on digital display
Temperature Compensation	0-50°C adjustable from Temperature Table at 25°C
Temperature Measurement Specifications
Range	0-100°C
Resolution	0.1°C
Accuracy	±0.2% ± 1 digit
Sensor	RTD (PT-100)

Applications & Industries

Environmental Monitoring & Testing Digital pH Conductivity and Temperature Meter 181

• Water Quality Assessment - Evaluate natural water, drinking water, and treated water quality
• Wastewater Analysis - Monitor treatment processes and effluent quality
• Environmental Compliance - Verify adherence to regulatory standards
• Pollution Control - Assess contamination levels and treatment effectiveness
• Ecological Studies - Support research on aquatic environments

Agricultural & Soil Testing Digital pH Conductivity and Temperature Meter 181

• Soil pH Analysis - Determine soil acidity/alkalinity for crop suitability
• Irrigation Water Quality - Assess water properties for agricultural use
• Nutrient Solution Testing - Monitor hydroponic and fertilizer solutions
• Soil Conductivity Measurement - Evaluate soluble salt content
• Agricultural Research - Support studies on soil-water interactions

Industrial Applications Digital pH Conductivity and Temperature Meter 181

• Manufacturing Quality Control - Monitor process solutions in various industries
• Boiler Water Analysis - Control water chemistry in heating systems
• Cooling Tower Management - Monitor water parameters for system efficiency
• Chemical Production - Verify solution properties during manufacturing
• Industrial Wastewater - Check effluent properties before discharge

Specialized Industry Applications Digital pH Conductivity and Temperature Meter 181

• Pharmaceutical Manufacturing - Quality control for water-based formulations
• Food & Beverage Production - Monitor process water and product characteristics
• Paper & Pulp Industry - Control water quality throughout production
• Petroleum Refineries - Test water used in various refining processes
• Cement Manufacturing - Monitor water quality for production needs
• Sugar Processing - Control solution properties during manufacturing
• Brewing Operations - Ensure water quality for beverage production

Parameter Details & Significance

pH Measurement Digital pH Conductivity and Temperature Meter 181

The Model 181 provides comprehensive pH testing capabilities to determine acidity and alkalinity levels:

• Complete Range Coverage - Full 0-14 pH scale measurement capability
• High Resolution - 0.01 pH precision for detecting minor changes
• Superior Accuracy - ±0.01 pH accuracy for critical applications
• Ultra-High Input Impedance - >10¹² ohms prevents sample loading effects
• Temperature Compensation - Manual adjustment for readings at different temperatures
• Slope Adjustment - 80-120% correction range for electrode calibration

Conductivity Measurement Digital pH Conductivity and Temperature Meter 181

Conductivity testing determines the ionic content of solutions, providing insight into dissolved solid concentration:

• Dual Range Capability - Measurement up to 20 ppt with two selectable ranges
• High Precision - ±0.5% accuracy for reliable salt concentration determination
• Built-in Oscillator - Integrated 1 kHz signal source for stable readings
• Adjustable Cell Constant - Customizable from 0.2 to 1.8 with digital display readout
• Temperature Compensation - Correction for samples between 0-50°C based on reference tables
• Clear Resolution - 1 ppt resolution for detailed analysis

Temperature Measurement Digital pH Conductivity and Temperature Meter 181

Accurate temperature reading is essential both as a standalone parameter and for compensation calculations:

• Wide Measurement Range - Covers 0-100°C for diverse applications
• Precise Resolution - 0.1°C increments for detailed temperature monitoring
• High Accuracy - ±0.2% precision for reliable thermal assessment
• Premium Sensor Technology - RTD (PT-100) sensor for stable, accurate readings
• Integrated Display - Temperature values shown on the same display interface
• Compensation Reference - Serves as basis for pH and conductivity temperature corrections

Design & Performance Features

Advanced Electronic Architecture Digital pH Conductivity and Temperature Meter 181

The Model 181 incorporates sophisticated electronic design for reliable operation:

• Solid-State Circuitry - Modern IC-based design for stability and reliability
• High-Visibility Display - Bright red LED display for clear reading in laboratory environments
• Precision Measurement Circuits - Carefully engineered electronics for accurate parameter conversion
• Signal Isolation - Proper separation between measurement channels to prevent interference
• Low Drift Components - Selected for long-term measurement stability

Practical Laboratory Design Digital pH Conductivity and Temperature Meter 181

The instrument features a user-friendly layout optimized for laboratory environments:

• Integrated Multi-Parameter Interface - Streamlined controls for all three measurement functions
• Compact Footprint - Efficient use of laboratory bench space
• Robust Housing - Durable construction for long service life
• Intuitive Controls - Logical arrangement of adjustment and selection knobs
• Compatible Connections - Standard interfaces for sensors and electrodes

Operational Advantages Digital pH Conductivity and Temperature Meter 181

The Model 181 offers several practical benefits for laboratory and field testing:

• Three-in-One Functionality - Replaces multiple single-parameter instruments
• Cost Efficiency - More economical than purchasing separate meters
• Space Saving - Reduces equipment footprint in crowded laboratories
• Simplified Workflow - Measure multiple parameters without changing instruments
• Consistent Methodology - Standardized approach to related measurements
• Reduced Training Requirements - Users learn one interface instead of multiple systems

Operation & Calibration

pH Measurement Procedure Digital pH Conductivity and Temperature Meter 181

1. Connect the pH electrode to the meter
2. Set the temperature compensation control based on sample temperature
3. Calibrate using standard buffer solutions (typically pH 4, 7, and 10)
4. Adjust slope correction if necessary (80-120% range)
5. Rinse electrode with distilled water
6. Immerse electrode in the sample solution
7. Allow reading to stabilize
8. Record the pH value

Conductivity Measurement Procedure Digital pH Conductivity and Temperature Meter 181

1. Connect the conductivity cell to the meter
2. Select the appropriate measurement range
3. Adjust cell constant to match your conductivity probe (0.2-1.8)
4. Set temperature compensation based on sample temperature (0-50°C)
5. Calibrate using standard conductivity solutions
6. Rinse cell with distilled water
7. Immerse cell in the sample solution
8. Allow reading to stabilize
9. Record the conductivity value

Temperature Measurement Procedure Digital pH Conductivity and Temperature Meter 181

1. Connect the RTD (PT-100) temperature probe
2. Immerse the probe in the sample
3. Allow reading to stabilize
4. Record the temperature value
5. Use this value to set appropriate temperature compensation for other measurements

Typical Parameter Ranges for Common Applications

Common pH Ranges by Application

Application	Typical pH Range	Significance
Drinking Water	6.5-8.5	Potability standards
Swimming Pools	7.2-7.8	Disinfection effectiveness
Freshwater Aquariums	6.5-7.5	Aquatic health
Agricultural Soil	6.0-7.5	Optimal plant growth
Boiler Water	8.5-9.5	Corrosion prevention
Industrial Wastewater	6.0-9.0	Discharge compliance

Common Conductivity Ranges by Application

Application	Typical Range	Significance
Ultrapure Water	<5 μS/cm	High purity verification
Drinking Water	50-1500 μS/cm	Dissolved mineral content
Freshwater Rivers	100-2000 μS/cm	Natural dissolved solids
Irrigation Water	< 2000 μS/cm	Crop suitability
Brackish Water	2000-15,000 μS/cm	Intermediate salinity
Seawater	~50,000 μS/cm	Marine standard

Maintenance & Care

General Instrument Care Digital pH Conductivity and Temperature Meter 181

• Regular Cleaning - Wipe down with slightly damp cloth; avoid harsh chemicals
• Dust Protection - Cover when not in use to prevent dust accumulation
• Ventilation - Ensure adequate airflow around instrument during operation
• Power Stability - Use with stable power source; consider surge protection
• Periodic Inspection - Check connections and controls for proper function

Electrode & Sensor Maintenance Digital pH Conductivity and Temperature Meter 181

• pH Electrode Care - Store in appropriate storage solution; never allow to dry out
• Conductivity Cell Cleaning - Rinse thoroughly after use; periodic cleaning with recommended solutions
• Temperature Probe Protection - Avoid mechanical stress and extreme temperatures
• Regular Calibration - Verify accuracy with standard solutions at recommended intervals
• Proper Storage - Store sensors according to manufacturer recommendations when not in use

Value Proposition Digital pH Conductivity and Temperature Meter 181

The Digital pH, Conductivity & Temperature Meter Model 181 delivers exceptional value through its integrated multi-parameter design, combining three essential laboratory measurements in a single economical instrument. For laboratories, environmental testing facilities, agricultural centers, and industrial quality control departments, this meter offers:

• Cost Efficiency - Lower acquisition cost compared to purchasing separate instruments
• Space Optimization - Reduced laboratory footprint with consolidated equipment
• Workflow Improvement - Streamlined testing procedures with a unified interface
• Reliable Performance - Solid-state design and high-quality components ensure consistent results
• Versatile Application - Adapts to diverse testing requirements across multiple industries
• Ease of Use - Intuitive operation without sacrificing measurement quality

Summary Digital pH Conductivity and Temperature Meter 181

The Digital pH, Conductivity & Temperature Meter Model 181 represents an ideal solution for laboratories and testing facilities requiring accurate measurement of three critical water and solution parameters. By combining pH, conductivity, and temperature testing in a single robust instrument, it delivers exceptional value and functionality for diverse applications. With its high-precision capabilities—including 0.01 pH resolution, conductivity measurement up to 20 ppt, and 0.1°C temperature accuracy—this meter meets the needs of environmental testing, water quality monitoring, agricultural analysis, and industrial process control. The integrated design streamlines workflows while reducing equipment costs and laboratory space requirements. Engineered with solid-state IC circuitry, high-visibility LED display, and durable construction, the Model 181 provides reliable performance for chemical laboratories, pollution testing facilities, public health engineering, industrial applications, and agricultural research. Its combination of accuracy, versatility, and economic value makes it an excellent choice for professionals requiring dependable multi-parameter measurement capabilities.