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Chlorine  emanating from the Greek word 'χλωρóς' (khlôros, meaning 'pale green'), is one of the most commonly used disinfectants for water disinfection. Chlorine can be applied for the deactivation of most microorganisms and it is relatively cheap.Chlorine has been used for applications, such as the deactivation of pathogens in drinking water, swimming pool water and wastewater, for the disinfection of household areas and for textile bleaching, for more than two hundred years.

Chlorine also plays an important role in medical science. It is not only used as a disinfectant, but it is also a constituent of various medicines. The majority of our medicines contain chlorine or are developed using chlorine-containing byproducts. Medical herbs also contain chlorine. The first anaesthetic used during surgery was chloroform (CHCl3).

The chemical industry creates ten thousands of chlorine products using a small number of chlorine containing chemicals. Some of the products which contain chlorine are glue, paints, solvents, foam rubbers, car bumpers, food additives, pesticides and antifreeze. One of the most commonly used chlorine-containing substances is PVC (poly vinyl chloride). PVC is widely used, for example in drainpipes, insulation wires, floors, windows, bottles and waterproof clothes.

About 65% of industrialized chlorine is used to produce organic chemicals, such as plastics. About 20% is used to produce bleach and disinfectants. The remaining chlorine is used to produce inorganic compounds from chlorine and several different elements, such as zinc (Zn), iron (Fe) and titanium (Ti).

Real-time, online water quality monitors, analyzers and controllers are also used to measure levels of chlorine in water and wastewater.
Model 95 CL

A Residual Chlorine Monitoring System (without reagents, temperature and pH compensated)
Reagent-free Measurement.This microprocessor-based measurement system uses a unique combination of pH, temperature, and chlorine sensor inputs to produce highly accurate, reliable measure-ments - without using costly reagents - in applications where the process does not exceed 8.5 pH.

Temperature and pH Correction.

This system automatically compensates for the infuences of temperature and pH, providing highly accurate chlorine measurements.

Multiple Measurement Readings/Outputs.
The analyzer displays readings for:·

  • Free residual chlorine
  • Hypochlorous acid (HOCl)
  • pH
  • Temperature

Four 4-20 mA outputs can be independently set up to track any of these measured parameters.

Replaceable Chlorine Sensor Membrane Cap.

The chlorine sensor has a unique membrane cap to ensure repeatable measurements and simplify maintenance.

Pre-plumbed Sampling Assembly.

The pre-plumbed sampling assembly, housed in a NEMA 4X enclosure along with a built-in flowmeter and adjustable flow rate control, greatly simplifies installation and operation.

Software Security Access.

Built-in passcode access, when enabled, prevents unauthorized alteration of stored values while allowing an operator to recall any setup value.

Dedicated Relay Control.

Four solid-state relays provide dedicated control and alarm functions for free residual chlorine and pH. Adjustable relay setpoints and deadbands, and selectable operating modes that respond to increasing or decreasing reading provide configuration versatility to meet your application requirements.
Add-on Accessory for High pH Applications.

A special pH buffering system is available for applications where the process exceeds 8.5 pH. The buffering system has a flow-thru housing assembly and solid buffer cartridge which eliminates the need for pumps, valves, and tubing that liquid-type buffering systems require.

System Specifications

Measuring range
Free res. Chlorine 0.00 ~ 5.00 ppm
Hypochlorous acid 0.00 ~ 5.00 ppm
pH 0.00 ~ 14.00 pH
Temperature 0.0 ~ 100.0C
Display 4 digit
Compensation automatic
Sampling ­ow rate 0.5~1.0 LPM
Sampling pressure 3,4 bar
Response time 30s typical
Accuracy 0,1pH, 0.1ppm, 0.1C
Outputs 4 x 0-20 or 4-20mA
4 x solid state relays
Power supply 230VAC 50/60 Hz
Analyzer weight 5,5kgs approx.
Sampling assembly weight 6,8kgs approx.