EMEC Online Analyzer Supplier in Bangladesh
Your ETP discharges all day, but a handheld meter checks it for a few seconds. EMEC online analyzer controllers watch pH, DO, TDS and chlorine around the clock, then send the signal to your PLC or dosing pump. They come from Italy, with installation and after-sales support from Techno Bangla Creation.
What Is an Online Analyzer?
An online analyzer is a controller that measures water quality continuously, straight from the pipe, tank or channel. It reads parameters such as pH, dissolved oxygen (DO), TDS, chlorine, turbidity and TSS, shows them on a display and sends a 4-20 mA or RS485 signal to a PLC, PC or automatic dosing system.
An online analyzer is not a handheld meter. A handheld meter gives one reading of one sample when someone takes it, while an online analyzer watches the process all day. For the chemical feed side, see our EMEC dosing pump page.
- Continuous measurement for auto dosing systems
- Large LCD with programmable illumination
- 4-20 mA and RS485 outputs for PLC and PC
- Installation and after-sales support in Bangladesh
EMEC Online Analyzer Specifications
- Type
- Online analyzer controller for auto dosing systems
- Parameters
- pH, DO, TDS, Temperature, Chlorine, Turbidity, TSS (depends on model and sensor)
- Display
- Large LCD with auto-sense ON/OFF programmable illumination
- Signal output
- 4-20 mA, RS485 (for PC and PLC)
- Mounting
- Wall, Pipe and Panel mounted
- Brand
- EMEC
- Origin
- Italy
Exact parameters, ranges, relay outputs and sensor type depend on the model you select. Send us your parameter list and our engineers will confirm the right configuration.
How an Online Analyzer Works
- Sensor Sits in the ProcessA pH, DO, conductivity or chlorine sensor is fitted in the pipe, tank or channel.
- Sensor Sends a SignalThe sensor produces a small electrical signal that changes with the water condition.
- Controller Converts ItThe controller turns the signal into a reading in pH, mg/L or µS/cm and applies its calibration.
- Display and OutputThe LCD shows the value while a 4-20 mA or RS485 signal goes to the PLC or PC.
- Dosing RespondsThe control system adjusts a chemical dosing pump to bring the value back to its target.
Key Benefits
Treatment plants run better when the operator can see the water quality as it changes.
- Continuous readings show pH swings that spot checks miss. One study of Bangladeshi textile effluent reported pH from about 5.6 to 11.6
- 4-20 mA and RS485 outputs connect to PLCs, PCs and automatic dosing systems
- Tighter pH control helps keep treated water inside the discharge limit and supports neutralization dosing
- DO monitoring helps operators avoid over-aeration, which wastes blower energy
- Large LCD with programmable illumination and wall, pipe or panel mounting
- Italian EMEC brand with local supply, installation and after-sales support from Techno Bangla
Do You Need an Online Analyzer?
Choose an Online Analyzer When
- Effluent pH or load changes during the day
- You dose acid, alkali or disinfectant automatically
- The plant runs around the clock with few operators
- You need data sent to a PLC or PC for records
- The buyer or regulator expects proof of controlled discharge
Stay with Manual Testing When
- The plant is small and the flow is steady
- Water quality rarely changes between checks
- Nobody will clean and calibrate the sensor on schedule
- Budget allows only a handheld meter for now. See our flow meter range for other monitoring steps
Where Online Analyzers Are Used
Any process where pH, oxygen, dissolved solids or chlorine must stay inside a set range.
- ETP Effluent pH Control
- Neutralization Tank
- Aeration Tank DO
- WTP
- STP
- Textile Dyeing and Washing
- Pharmaceutical
- Food and Beverage
- Cooling Tower
- Chlorine Disinfection
How to Choose the Right Online Analyzer
Share these details with our engineers and we will recommend a suitable model and sensor.
- Parameters and range. List what you must measure: pH, DO, TDS, chlorine, turbidity or TSS. One controller may not cover every parameter, so confirm the model.
- Sensor type. For DO, manufacturers describe galvanic sensors as cheaper and faster, and optical sensors as longer-lived but costlier. For pH in wastewater, non-porous junction electrodes are reported to last longer than porous ones.
- Sample point. Fit the sensor where the water is well mixed and flowing. Calibration cannot fix a blocked or unrepresentative sample line.
- Signals and integration. Match 4-20 mA or RS485 to your PLC, PC or dosing pump.
- Cleaning and calibration plan. Keep buffer solutions, spare sensors and a named person. Fit the controller in a clean, dry panel or wall box suited to humid, dusty plant rooms.
Frequently Asked Questions
Should I choose a single, dual or multi-channel EMEC controller?
Match the controller to how many readings you need at one point. A single-channel unit reads one parameter, such as pH or DO. Dual-channel models pair two, such as pH + ORP or pH + chlorine, while the MAX5 handles up to five. Send your parameter list and we will recommend the smallest unit that covers it.
Do I need a relay, pulse or 4-20 mA output to run a dosing pump?
It depends on how your pump takes its signal. A relay switches the pump on and off at a setpoint. A pulse output makes the pump’s stroke rate follow the reading proportionally. A 4-20 mA signal feeds a PLC or a pump with an analog input. Tell us your pump model and we will match the output.
Which readings should I set alarms on for a textile ETP?
Besides pH, watch DO and TDS. One monitoring study plotted pH, DO and TDS against ECR 2023 limits, flagging DO below 4.5 mg/L and TDS above 2,100 mg/L. Set your alarms a little inside those limits so operators have time to react. Online data supports control; it doesn’t replace Department of Environment sampling.
Why does my chlorine reading change when pH changes?
Chlorine sensors respond to pH, because the active form of chlorine shifts with it. EMEC’s open amperometric cells work within pH 6–8 and use pH and temperature compensation. If your pH swings widely, pair the chlorine sensor with a pH sensor, for example on a dual pH + chlorine controller.
How do I check an online analyzer is telling the truth?
Take a grab sample at the analyzer’s own sample tap, measure it on a calibrated bench instrument, and compare. A fouled sample line can give a steady but wrong reading. Calibration frequency depends on your process. Weekly or biweekly is a common starting point for continuous pH, and you should recalibrate after cleaning. Log every check.
Where should the sensor go in my ETP or WTP?
Fit it where the water is well mixed and flowing. Don’t put it at the dosing point, where chemical hasn’t mixed yet. Common spots are after the neutralization tank’s mixing zone and at the final outlet. Keep sample lines short and continuously flowing, and leave room to pull the sensor for cleaning.
Can my DO reading control my blower?
Often yes. A DO analyzer can send a 4-20 mA setpoint signal to a blower inverter, so air matches demand instead of running flat out. This needs a blower with variable-speed control, and the exact output depends on the model. Tell us your blower setup and we will confirm what your controller can drive.
Why does an EMEC controller cost more than a basic pH display?
You are paying for control, not just a number. EMEC controllers add PID or proportional dosing modes, several relay and pulse outputs, tank-level inputs, alarms for damaged probes or maximum dosage, and a probe diagnostics menu. A basic display only shows the reading. Send us your control needs and we will quote the right unit.
