Analytical Instruments
DISSOLVED OXYGEN TRANSMITTER
DO 100S
DO-100S Dissolved Oxygen Transmitter is a reliable, two-wire loop-powered transmitter designed for accurate online dissolved oxygen (DO) measurement in industrial and process applications. It accepts input from a DO electrode and converts the measured signal into a stable 4–20 mA output with optional HART communication for easy integration with control systems. The transmitter provides real-time DO indication on a backlit LCD display, ensuring clear on-site monitoring. With high accuracy of ±0.25% of full scale, fast response time, and excellent repeatability, DO-100S delivers consistent and dependable performance. Auto or manual temperature compensation using RTD PT-100 / PT-1000 improves measurement reliability across varying process conditions. Available in weatherproof IP67 or CMRI IIA/IIB flameproof enclosures, DO-100S is ideal for water treatment, wastewater, chemical, pharmaceutical, and industrial process monitoring applications.
Configure the transmitter and electronics based on application, environment, and compliance requirements.
| Type of Input | From DO Electrode |
| Display | LCD Display |
| Type of Output | 4 - 20 mA, 4 - 20 mA with HART (Generic) |
| Calibration Range | 0 to 20.9 ppm |
| Electronics Transmitter | Accuracy +/- 0.25% F. S. |
| Isolation | 1.4 KV between Input, Output & Power Supply |
| Sensor Connection | 1) Through BNC connector 2) Through Terminals |
| Power Supply | 24V DC Two Wire Loop Powered |
| Power Consumption | < 50 mW |
| Repeatability | +/-0.05% of SPAN, at 25 °C |
| Response Time | < 1000 mSec |
| Temperature Coefficient | +/- 0.01% per °C |
| Temperature Compensation | RTD PT-100 / RTD PT-1000 |
| Electronic Protection Class | Flame Proof CMRI IIA IIB / Weather Proof IP-67 |
| Dimensions | 155 mm (H) x 105 mm (W) X 130 mm (D) |
| Electrical Connections | 1) M20X1.5 (F) 2) ½” NPT(F) |
| Mounting | 2” Pipe Mounting |
| Weight | 1 kg (Approximate) |
| Housing | Cast aluminium with epoxy coating NEMA 4X / SS 316 |
| Ambient Conditions | Temperature -20 to 70 °C / Humidity 5 to 95% non condensing at 25°C |
| Flow Through Assembly (Optional | SS / PP |
Download the complete product catalogue for detailed specifications, dimensions, certifications, and application guidance.
Electronet instruments are widely deployed across multiple industries and utilities for reliable monitoring and control of critical process parameters.
| Industry | Key Applications |
| Water & Wastewater | Monitoring dissolved oxygen in treatment plants, aeration tanks, and effluent systems |
| Aquaculture & Fisheries | Measuring DO in fish farms, hatcheries, and aquaculture systems for optimal oxygen levels |
| Chemical & Petrochemical | DO monitoring in reactors and process systems for reaction control and safety |
| Power Generation | Monitoring DO in cooling water, condensate, and boiler feedwater systems |
| Food & Beverage | DO measurement in process water, fermentation, and production lines for quality control |
| Pharmaceuticals & Biotechnology | Monitoring DO in bioreactors and formulation systems for process optimization |
| Pulp & Paper Industry | Dissolved oxygen monitoring in pulping, bleaching, and effluent treatment processes |
| Marine & Shipbuilding | DO measurement in ballast water, cooling circuits, and environmental monitoring |
| Metals & Mining | Monitoring DO in process water, effluent, and slurry for process efficiency |
| Environmental Monitoring | Continuous DO monitoring in rivers, lakes, and industrial effluent streams |
Core capabilities and advantages of the product.
CONDUCTIVITY / TDS TRANSMITTER
TOROIDAL CONDUCTIVITY / TDS TRANSMITTER
pH / ORP TRANSMITTER
CONDUCTIVITY TRANSMITTER - SWITCH
TOROIDAL CONDUCTIVITY TRANSMITTER - SWITCH
DISSOLVED OXYGEN TRANSMITTER - SWITCH
OXIDATION-REDUCTION POTENTIAL TRANSMITTER - SWITCH
pH TRANSMITTER - SWITCH
pH/ORP TRANSMITTER - SWITCH
UNIVERSAL ANALYTICAL CONTROLLER
CONDUCTIVITY SENSOR
TOROIDAL CONDUCTIVITY SENSOR
ORP SENSOR
DO Sensor