detailed description

Depolox @ 3PLUS residual chlorine analyzer can continuously detect free chlorine or total chlorine (compounds), chlorine dioxide or ozone in drinking water.

Depolox @ 3PLUS residual chlorine analyzer can continuously detect free chlorine or total chlorine (compounds), chlorine dioxide or ozone in drinking water. Using proven and widely recognized current measurement technology, this analyzer directly detects the residual amount of these disinfectants and outputs a 4-20mA signal for control or recording, while providing an integrated alarm relay. This analyzer can also be used to detect temperature, pH value, or fluoride.

The DEPOLOX ® 3 plus residual analyzer continuously measures free or total (combined) chlorine, chlorine dioxide or ozone in drinking water applications. Utilizing proven and universally accepted amperometric measurement technology, this analyzer directly measures these disinfectant residuals and provides a 4-20 mA output signal for control or recording purposes. Integral alarm relays are provided. The analyzer is also available in an arrangement for measuring temperature and pH or fluoride.

characteristic

Three electrode measuring unit

Using three electrode technology to measure the unit for disinfectant detection. This measurement unit does not require frequent zeroing required by other types of analyzers, greatly improving repeatability and stability, and significantly reducing maintenance workload. This technology is applied in bare electrodes and membrane electrodes.

This internal buffer membrane sensor can detect free chlorine or total chlorine, including water samples with pH changes, without the need for any reagents. Because no chemical reagents are added to the water, the tested sample water can be returned to the water supply pipeline or discharged without any treatment.

FEATURES
Three electrode measuring cell
For disinfectant measurement, a three electrode technology measuring cell is used. This cell eliminates the need for the constant zero adjustment typical of other analyzers. Reliability and stability are vastly improved while maintenance is dramatically reduced. This technology is used in both the bare-electrode and membrane-type cells.

flexible configuration

There are two options for electronic control units: single signal input for measuring disinfectants only, and dual signal input for measuring disinfectants and pH or fluoride. In addition, depending on the configuration of the measurement unit, both single input and dual input can obtain the sample water temperature signal. There are 5 different configurations of measurement units: two are bare electrode measurement units (Depolox @ 3 PLUS measurement unit and Depolox @ 5 measurement unit); There are also two types of membrane electrode measurement units (Depolox @ 3 PLUS membrane measurement unit and VariaSens) ™ Measurement unit); And a Y-shaped overcurrent probe component, only used for detecting fluorine.

Reagentless chlorine measurement
The internally buffered membrane-type sensor measures free or total chlorine without the need for reagents. This includes samples with varying pH. With no chemical addition, the sample can be added back to the supply or simply drained without concern for discharge restrictions.

Advanced electronic technology of the Water Treatment Technology Department

The enclosure level of the analyzer is NEMA 4X, which can provide three isolated 4-20mA output signals, disinfectant residue, temperature, pH, or fluorine. There is also an alarm relay and RS-485 communication interface, as well as a backlit LED display and a six key keyboard that can be used for various operations, including inputting information, setting, calibration, and diagnostic menus.

Flexible arrangements
There are two electronic control configurations: a single input version for disinfectant only measurement and a dual-input version for disinfectant and pH or fluoride measurement. In addition, a sample temperature output signal is available from both the single and dual input arrangements, dependent on the choice of flow cell. There are a total of five flow cell configurations: two that incorporate the integral bare-electrode measuring cell (DEPOLOX 3 plus and DEPOLOX 5 flow cell); two that accommodate the membrane-type measuring
cell (DEPOLOX 3 plus membrane-type and VariaSens ™ flow cell); and a simple Y-type flow-thru probe holder for fluoride only measurement.

Main advantage

• No need for reagents to detect residual chlorine

• Flexible configuration - including four types of sample cups and two control units

NEMA4X casing

• Reliable and stable residual measurement

User friendly menu interface for setting, calibrating, and analyzing diagnostics

Key Benefits
• Chlorine measurement without reagents
• Flexible arrangements - four flow cell and two electronic control units are available
• Advanced electronics housed in a NEMA 4X enclosure
• Reliable and stable measurement of residuals
• User-friendly menu driven access to set-up, calibration and diagnostics

Select measurement unit

To ensure stable and representative detection signals, continuous flow is required. The continuous flow rate depends on the measuring unit and the detection technology used by the measuring unit.

Choice of flow cell technology
To ensure a stable, representative measurement signal, a constant flow rate is required. This is provided by a choice of flow cells, dependant on the type of measurement technology that is used:

Bare electrode measurement unit for free hydrogen

The characteristic of this detection technology is the use of bare electrode measurement units for free chlorine. By utilizing a three electrode unit, this unique combination of analyzer/sensor has a very fast response time (variation of 90%<20 seconds) and high accuracy (full-scale: t 2% ) ， To meet the requirements of disinfection applications with large fluctuations, or suitable for use in situations where the water hardness is too high to use membrane electrodes. To maintain the sensitivity of the bare electrode sensor and extend the calibration time interval, quartz sand can be used to clean the electrode surface according to fluid mechanics, but it is required that the sample water has a stable pH value. Another option is to add a pH sensor, which utilizes a dual input control unit to compensate for the pH value when measuring free chlorine without the need for buffering reagents.

Bare-electrode type cell for free chlorine
This measurement technology features an integral, bare-electrode flow cell for free chlorine. Utilizing the three electrode cell design described above, this unique combination of analyzer/sensor provides a very quick response time (90% change < 20 sec.) with high accuracy ( ±2% F.S.) to meet fluctuating disinfection demands or applications where there is a high degree of hardness, which prohibits the use of a membrane-type sensor. The well-proven principle of hydromechanical grit cleaning of the electrode surfaces maintains the sensitivity of the bare-electrode sensors extending the interval time between calibrations. A sample with a constant pH is required.
Alternatively, the addition of a pH sensor, utilizing the dual input electronic package, provides for a pH-compensated free Cl2 measurement without the need to buffer the sample.

Depolox @ 3 PLUS measuring unit

The measurement unit combination of this economy includes a transparent glass resin sample water cup with a flow regulator to provide continuous sample water flow for the detection electrode. Equipped with a built-in PT 100 sensor, it can provide temperature compensation and temperature detection output signals while measuring residual chlorine. The pH value or fluoride sensor probe can be increased by measuring the top cover of the unit.

DEPOLOX ® 3 plus flow cell
This economical flow block assembly consists of a transparent Plexiglas body with an integral flow regulator to supply a consistent sample flow to the measuring electrodes. An integral PT 100 sensor provides for temperature compensation of the chlorine residual reading as well as a temperature measurement output signal. An additional sensor probe for pH or Fluoride can be added through the flow cell cover.

Depolox @ 5 measuring units

The high-end measurement unit combination includes all the features of Depolox @ 3PLUS mentioned above, and the temperature sensor has been upgraded to PT 1000, which can output and monitor sample water flow signals to provide flow loss alarm signals.

DEPOLOX ® 5 flow cell
This deluxe flow block assembly includes all of the features of the above DEPOLOX ® 3 plus cell, except that an integral multi-sensor provides a PT 1000 temperature measurement and output and monitors sample flow to provide a loss-of-flow alarm contact.

Membrane electrode measurement unit

The membrane electrode sensor can detect four disinfectant indicators: free chlorine, total chlorine, chlorine dioxide, or ozone. The combination of three electrode detection technology and membrane can evenly diffuse these oxidants onto the sensor. The internal buffering reagent reduces the impact of pH on the detection of residual chlorine. Therefore, for sample water with changes in pH value, there is no need for external pH buffering or pH compensation. The sensor is equipped with temperature compensation for residual chlorine measurement.

Membrane-type cell
There are four disinfectant specific, membrane-type sensors available for measuring either free chlorine, total chlorine, chlorine dioxide, or ozone. Utilizing the three electrode measurement technology, these sensors incorporate a membrane for diffusion of the oxidant into the working electrode. An internal, buffered electrolyte reduces the effect of pH on chlorine measurement. Therefore, external pH buffering or pH compensation is not required
for samples with a varying pH. Temperature compensation of the chlorine residual reading is built into the sensor.

Depolox @ 3 PLUS membrane electrode measurement unit

This measurement unit is designed to be simple, ensuring a constant water flow rate through the membrane surface of the detachable sensor.

Sensors can be selected according to different disinfectants, making replacement easy. There is a spray pipe on the measuring unit for removing bubbles on the membrane surface that may affect accuracy and stability. The pH value or fluoride sensor probe can be increased by measuring the top cover of the unit. Note that this measuring unit cannot provide temperature output.

DEPOLOX 3 plus membrane - type flow cell
This simple flow block housing is designed to provide a constant flow of water past the membrane surface of the removable sensor. Sensors can easily be changed to monitor different disinfectants. A water jet, designed into the flow block, removes any bubbles from the membrane surface, which can affect accuracy and stability. An additional sensor probe for pH or Fluoride can be added through the flow cell cover. Note that a measured temperature output is not available with this flow cell.

VariaSens ™ Measurement unit

This measurement unit, based on the above measurement unit, integrates a flow regulator internally to maintain a constant sample water flow rate of 33 I/h. The multifunctional sensor is PT 1000, which can provide temperature monitoring and output as well as monitor sample water flow rate, and also provide flow loss alarm signals.

VariaSens ™ Flow Cell
In addition to the above, this flow block assembly utilizes an integral flow regulator to maintain the sample flow at a constant 33 l/h. An integral multi-sensor provides a PT 1000 temperature measurement and output and monitors sample flow to provide a loss-of-flow alarm contact.

Only detect fluoride

If fluoride is the only parameter that needs to be detected, a simple overcurrent device can be provided, which includes a Y-shaped overcurrent component and a sample water valve. Note that temperature detection and output are not included in this configuration.

Fluoride-Only Measurement
If fluoride is the only parameter to be measured, then a simple, flowthrough probe assembly can be provided. This consists of a Y-type flow-thru probe holder and a sample valve. Note that temperature measurement and output is not available with this configuration.