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DULCOTEST® Redox Sensors

Redox Measurement
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Redox Measurement

The Redox potential measures oxidants or reducing agents in a medium. The measurement of this parameter is relatively cost-efficient, however, it has also some disadvantages: These include non-selective determination of a defined oxidant or reducing agent, strong pH dependence, and the measured signal has a saturation curve with increasing concentration.

The Redox potential is a parameter that does not determine a specific oxidant or reducing agent, but will measure all agents within the sample line. The measured signal is strongly pH dependent and has a saturation curve with increasing concentration. The Redox measurement can be used as a cost-efficient alternative to direct determination of oxidants and reducing agents (e.g. via amperometric probes) or as a secondary measurement. For this purpose, the following conditions must be observed:

The sample line being analyzed is potential and there are no other redox active connections
The pH value of the process fluid remains constant
The expected concentration is located in the steep section of the saturation curve

Application Areas

Cyanid detoxication at high pH value by oxidation
Chromate detoxication at low pH value by reduction
Monitoring of disinfection effect when metering oxidants
Etc.

Our Program offers the following Advantages:

11 types of electrodes, in different versions (electric connection, installation length, cable length)
Fittings for simple installation into bypasses, containers, piping, an adapter fitting allows replacement without interrupting the process
Measuring transmitter with display/control to send a signal to a programmable logic controller (PLC) and without display/control
Control devices with staged capacities
Integration of the control circuits into Bus systems (PROFIBUS®-DP, CANopen-Bus)
Easy calibration with buffer solutions

Our product family DULCOTEST® Redox Electrodes offers a large range of electrodes for the solution of your measuring task. Application ranges include not only rather simple tasks in water treatment processes but also applications in industrial process waters with higher requirements as to temperature, pressure, pollution tolerance and chemical resistance.

The production process of our electrodes is subject to strictest quality controls. It is automated in routine steps but manually affected under professional control in critical steps. Thus, we reach an optimum of reproduced quality and cost reduction for you.

Advantages

Precise and reliable measurement, enable efficient process guidance and highest process safety.
Long lifetimes thanks to highest glass quality, optimized production and selection of the correct sensor. Thus, dead times and efforts for maintenance can be reduced.
Short stock times and short delivery times result in best-possible exhaustion of an electrode’s lifetime (weathering of an electrode already begins just after its production).
Special versions for installation length, cable length and plug for tailor-made process connections
OEM partner receive as private label.
Short delivery times enable short-time replacement
Storage in a protective tubular filled with electrolytes, which enables best-possible protection during transportation and measuring breaks
For detailed information on the individual sensors please see the download section.

Selection guide for electrodes

Medium	Max. Temperature ° F [° C]	Max. Pressure psig [bar]	Electrode
Clear medium	140 (60)	7.3 (0.5)	RHE (swimming pool, portable water)
		43.5 (3)	RHES (swimming pool, portable water)
		87 (6)	RHEP-Pt-SE (electroplating, process water)
		87 (6)	RHEP-Au-SE (cyanide detoxication, ozone monitoring)
	140 - 176 (60 - 80)	7.3 (0.5)	RHEP-Pt-SE (electroplating, process water)
	140 - 176 (60 - 80)	7.3 (0.5)	RHEP-Au-SE (cyanide detoxication, ozone monitoring)
	176 (80)	no overpressure	RHEN (high accuracy, long life)
Medium with solid components	176 (80)	87 (6)	RHER
	77 (25)	232 (16)	RHEX (emulsion, suspension sludge)
	212 (100)	87 (6)	RHEX (emulsion, suspensionsludge)

Housings

DGMa modular in-line sensor housing

Features	Advantages and benefits
Modular design for up to five (more on request) sensors of any type (PG 13.5 and/or R 1" thread)	Cost effective and simple upgrading/retrofitting through variable modules
	Enhanced measuring and process safety by means of the flow monitor module
	Resistant to electrical interference through a potential equalizer pin
	Simple assembly (pre-mounted on panel)
	Simple and quick installation
	Quick response time of the measurement because of low volume capacity

DLG III in-line sensor housing

Features	Advantages and benefits
Multiple Sensor housing for	Simple cleaning of the sensor housing and sensor by means of a removable housing cup
Multiple Sensor housing for	Cup can be used as container for a calibration solution
two sensors (pH, redox, conductivitiy, temperature, fluoride) with thread PG 13.5 plus	Enhanced measuring- and process safety as housing is resistant to electrical interference due to a potential equalizer pin
one sensor (chlorine, bromine, chlorine dioxide, ozone) with thread R 1" (25mm)	Simple and quick installation
	Quick response time of the measurement because of low volume capacity

DLG IV in-line sensor housing

Features	Advantages and benefits
Multiple housing for up to four sensors (pH, ORP, conductivity, temperature, fluoride; PG 13.5 thread)	Simple cleaning of the sensor housing and sensor by means of a removable housing cup
	Cup can be used as container for a calibration solution
	Resistant to electrical interference through a potential equalizer pin
	Enhanced measuring- and process safety as housing is resistant to electrical interference due to a potential equalizer pin
	Simple and quick installation
	Quick response time of the measurement because of low volume capacity

PP submersible sensor holder Type IPHa 3

Features	Advantages and benefits
For up to three electrodes (pH, ORP, conductivity, temperature, fluoride; PG 13.5 internal thread) Immersion depths: 3 ft., 6 ft., (1 m, 2 m)	Accepts a maximum of three sensors (e.g. pH, redox, temperature) with PG 13.5 internal thread, standard length 4.7" (120 mm)
	Customer can shorten the immersion lance/cut to length on site
	Enhanced measuring and process safety as housing is resistant to electrical interference though a potential equalizer pin
	Simple and quick installation
	Various accessories available
	Assembly to a flange possible

PP submersible sensor holder Tye IPHa 1

Features	Advantages and benefits
For up to three electrodes (pH, ORP, conductivity, temperature, fluoride; PG 13.5 internal thread) Immersion depths: 3 ft., 6 ft., (1 m, 2 m)	Accepts a maximum of three sensors (e.g. pH, redox, temperature) with PG 13.5 internal thread, standard length 4.7" (120 mm)
	Customer can shorten the immersion lance/cut to length on site
	Enhanced measuring and process safety as housing is resistant to electrical interference though a potential equalizer pin
	Simple and quick installation
	Various accessories available
	Assembly to a flange possible

Insertion Housing Adapter

Features	Advantages and benefits
For one sensor (pH, ORP, temperature, conductivity; PG 13.5 thread)	Simple assembly in pipes and tanks with enhanced requirements for pressure and temperature
Mounting: Screw in
Material: PP for temperatures up to 176° F (80° C) or stainless steel up to 356° F (180° C)
Thread: R ½" and R ¾"

Insertion Housing Adapter Set

Features	Advantages and benefits
For one sensor (pH, ORP, temperature, conductivity; PG 13.5 thread)	Simple assembly in pipes and tanks for standard conditions
Mounting: Glue in place	Simple assembly in pipes and tanks for standard conditions
Material: PVC for temperatures up to 122° F (50° C)	90° and 45° angle for optimal orientation of the sensor
3/4" (DN 20) and 1" (DN 25)	90° and 45° angle for optimal orientation of the sensor

Retractable Assembly WA-PH 1

Features	Advantages and benefits
For one pH or ORP electrode (PG 13.5 thread, length: 4.33"-4.93" (110-125 mm)	Direct and simple assembly in pipes and tanks
Mounting: Thread in	Direct and simple assembly in pipes and tanks
Material: PP	Electrodes can be changed without interrupting the process
Thread: 3/4"	Electrodes can be changed without interrupting the process

Portable Measuring Devices

Photometer

Microprocessor-controlled Photometer for calibrating amperometric and fluoride measuring systems. Photometers are pre-assigned to defined verification procedures and include various measurements. (...more)

Multi-Parameter Controller diaLog DACa

The diaLog DACa controller uses intelligent controller functions to close the control circuit between ProMinent DULCOTEST® sensors and ProMinent® metering pumps. (...more)

Single-Channel Measuring and Control Instrument DULCOMETER® Type D1Cb/ D1Cc

The DULCOMETER® Type D1Cb is suitable for applications in drinking water, wastewater and cooling water treatment. The single-channel measuring and control unit D1Cb is equipped for all-important measured variables for basic applications in water treatment and with an error and calibration log book (...more)

Measuring and control device DULCOMETER® Compact

The new measuring and control device DULCOMETER® Compact for pH and redox measured variables is equipped with the standard functions for use in water treatment plants, allowing the operator to switch between the measured variables pH and redox, and between P and PID control characteristics. (...more)

Measuring and control device DULCOMETER® Compact

The new measuring and control device DULCOMETER® Compact for pH and redox measured variables is equipped with the standard functions for use in water treatment plants, allowing the operator to switch between the measured variables pH and redox, and between P and PID control characteristics. (...more)

DULCOMETER® DMT 2-Wire-Transmitters

Compact 2-wire-transmitter with microprocessor technology. Reliable monitoring for pH, Redox, Chlorine, conductive conductivity and temperature applications. (...more)

Measuring and control device DULCOMETER® Compact

The new measuring and control device DULCOMETER® Compact for pH and redox measured variables is equipped with the standard functions for use in water treatment plants, allowing the operator to switch between the measured variables pH and redox, and between P and PID control characteristics. (...more)

Brochures

DULCOMETER® Instructional Videos

Manuals And Instructions

Product Catalog Full Version

Catalog: 2020 Product Catalog - Full Version | Part #: 7750257 | Updated: 9/28/20
Catalog: 2020 Product Catalog - Full Version | Part #: 7750257 | Updated: 9/28/20

Product Catalog Section

Catalog: 2020 Product Catalog - Pumps & Systems Accessories Section | Part #: 7750257 | Updated: 2/18/20
Catalog: 2020 Product Catalog - Pumps & Systems Accessories Section | Part #: 7750257 | Updated: 2/18/20
Catalog: 2020 Product Catalog - DULCOMETER, Cooling Tower & Boiler Controller Section | Part #: 7750257 | Updated: 2/18/20
Catalog: 2020 Product Catalog - Dulcotest Sensor Section | Part #: 7750257 | Updated: 2/18/20

ProMinent Helps Video

Video: ProMinent & Cranberry Township Wastewater Treatment Plant | Part #: xxxxxx | Updated: 4/10/19
Video: ProMinent & Cranberry Township Wastewater Treatment Plant | Part #: xxxxxx | Updated: 4/10/19

Quickstart Guide

Sensor Manuals And Instructions

Frequently Asked Questions

Standard Lead Times for Products / Expediting

Standard lead times are listed below. If you need an order expedited, please contact your customer service representative. Please be aware that overnight shipments receive priority over ground shipments. Gala/Beta/Concept - 3 days Sigma series - 5 days ProMus - 2 weeks Dulcometer 3-4 days

When discharging to atmosphere, what steps will improve repeatability of dosing?

Installing a spring in the discharge valve of the pump gives some improvement, but for the maximum improvement, a backpressure valve should be installed at the end of the line.

What variables can be measured or controlled with ProMinent equipment?

We can measure or control pH, Redox, Free or Total Chlorine, Chlorine Dioxide, Conductivity, Ozone, Peracetic Acid, Hydrogen Peroxide and Dissolved Oxygen.

Can you explain what the different options are using the Ident-code for the D1C controller?

The Identcode for a D1C has 13 parameters that can be specified. The first parameter is the type of mounting such as wall or panel mount. Then the operating Voltage must be selected. The measured variable is the parameter being measured such as pH, chlorine, Redox ? The next selection is the connection of measured variable, which selects how the sensor is wired, such as an SN6 connector. The correction variable selects whether there is pH or temperature correction. The next variable is feed forward capability. This signal can be used for metering proportional to the flow rate. The control input allows control by contact closure. The signal output function can be set up as measured, controlled or correction variable. The power control variable pertains to the alarm functions and how and what they control. The pump control option is set up for whether pumps will be controlled. The control characteristic sets the pump up for proportional control band or the more sophisticated PID control. The interface is not used at this time. The last variable allows for the selection of the language.

When programming the D1C, what options can I enable or disable?

The D1C controller can be set up for a complete operating menu or a reduced menu. The reduced operating menu permits operation of the most important parameters, but will not allow the operator to change system parameters that are normally set up once, during initial installation. The complete operating menu allows all parameters to be changed.

What is feed forward control?

This signal can be used for metering proportional to the flow rate.

What option is required on controllers when you want to connect to a chart recorder?

The controller must have the signal output option for measured value for recording or two mA outputs.

What do I need to order with a D1C?

SEE WORD DOC

What do I need to order with a D2C?

SEE WORD DOC

I am working with a ProMinent D1C controller and controlling pH. I keep getting a check sensor error. What is causing this problem?

The problem may be that the checkout time is set too low. This feature is used to detect a defective sensor: if the value is set to 1 second, the processor looks for changes on the sensor readings; if the display does not change during this interval, a check sensor will result. This feature can be set from 1 to 9999 seconds or turned off in the measure value mode of the controller. Turn the checkout time to off or set the measured time to at least 60 seconds, so the sensor is checked once a minute instead of once every second.

Where are conductivity controllers most commonly used?

Conductivity controllers are used in industries including, paper, pharmaceutical, plating, electronics, breweries, power production, and plating. Two very popular applications are bottle washing and cooling towers.

Products

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DULCOTEST® Redox Sensors

Housings

DGMa modular in-line sensor housing

DLG III in-line sensor housing

Portable Measuring Devices

Brochures

DULCOMETER® Instructional Videos

Manuals And Instructions

Product Catalog Full Version

Product Catalog Section

ProMinent Helps Video

Quickstart Guide

Sensor Manuals And Instructions

Frequently Asked Questions

Standard Lead Times for Products / Expediting

When discharging to atmosphere, what steps will improve repeatability of dosing?

What variables can be measured or controlled with ProMinent equipment?

Can you explain what the different options are using the Ident-code for the D1C controller?

When programming the D1C, what options can I enable or disable?

What is feed forward control?

What option is required on controllers when you want to connect to a chart recorder?

What do I need to order with a D1C?

What do I need to order with a D2C?

I am working with a ProMinent D1C controller and controlling pH. I keep getting a check sensor error. What is causing this problem?

Where are conductivity controllers most commonly used?