GfG Water measurement technology Archives

VARIOCON Immersion Fitting

A redox electrode or a pH electrode can be used. The length of the fitting depends on the structural specifications and the specific area of application. A total length of up to 200 cm is possible. The fitting is characterised by simple installation and equally simple handling. The electrodes are easily screwed into the lower part. The electrode connections are inside the fitting and do not come into contact with the medium.

Key features at a glance:

Simple installation and operation
Compact and robust design
Measurement in open basins and in water
Accommodates one pH or redox electrode
Available length of up to 200 cm

VARIOCON Flow Fitting

The stable VARIOCON flow-through fitting is suitable for unpressurised lines, easy to install and equally easy to handle. The electrode is simply screwed into the fitting. A baffle plate is also integrated to protect the electrode from excessive flow and particles (e.g. sand). The fitting is made of PVC and is suitable for a temperature range of +5 to +50 °C.

Key features at a glance:

Simple and cost-effective installation
Simple operation
Compact and robust design
Inlet line – inlet at the bottom, outlet at the top
Accommodates one pH or redox electrode
Electrode will not dry out

VARIOCON Industry Fitting

The fitting can be used effortlessly for pressures up to 6 bar. The electrode connections are safely separated from the medium in the pipeline. For installation, weld-in nozzles made of PP/PE or stainless steel are used to adapt to structural conditions.

The electrode can be removed, cleaned and calibrated without interrupting the operating pressure. To do this, the measuring piston with the electrode is moved back and closes on the opposite side of the medium pressure. After calibration, the measuring piston is moved back into the system and resumes the measuring task. For installation in pipelines, there is a choice of different weld-in nozzles.

All contact parts of the fitting are made of stainless steel and are suitable for a temperature range of -10 to +130 °C.

Key features at a glance:

Simple and cost-effective installation
Simple operation
Quick adjustment (even during operation)
Installation in PP, PVC, PE or steel pipelines

VARIOCON Combination Fitting

User-friendly, durable and uncomplicated handling of the measurement characterise this VARIOCON combination fitting. The system operator – whether in water treatment, drinking water supply or swimming pools – must be able to rely on the measurement. The one-time zero point adjustment of the preamplifier as well as the uncomplicated adjustment of the slope are essential advantages in the hectic everyday life.

The fitting can take chlorine measurement, pH measurement as well as redox measurement via screwable electrodes. The flow regulation guarantees a constant flow rate. The fitting is delivered ready for connection, mounted on a mounting plate incl. preamplifier/controller for potentiostatic chlorine measurement. This preamplifier regulates the bias voltage across the electrode and provides the signal to the measuring amplifier for evaluation. The intelligent VARIOCON measuring amplifier for pH, ORP and chlorine completes the measurement and guarantees customised control.

Key features at a glance:

Flow control for a constant flow rate
Reliable measurements of chlorine, pH and redox values via easily attachable electrodes
Supplied ready for connection on a mounting plate
Preamplifier/controller for potentiostatic chlorine measurement
Simple installation and operation
Good price-performance ratio

VARIOCON

The modern device design allows individual settings for many measuring and control tasks in industry and municipal areas, such as swimming pools, neutralisation plants, refrigeration plants, waste water plants, water treatment plants, etc. The compact design (short installation depth) is a major advantage for use in control panel installations or wall-mounted housings. Thanks to modern and space-saving technology, the VARIOCON is a universally applicable measuring and control device.

Measurement display and operation
The VARIOCON measuring amplifier always displays the currently measured value. Thanks to the clear and large display, the measured value can be read well and clearly even from greater distances. For indication of the measured variable and the states of the control and alarm relays, further LEDs are clearly visible on the front of the unit. The front gives the operator/user an immediate and clear overview of the functions. The respective function (calibration, manual/auto mode, programme levels) is selected and set by means of 5 push-buttons.

Matched system components
The VARIOCON system is a combination of optimally matched components. Measuring amplifiers, controllers, measuring electrodes and fittings are user-friendly and practice-oriented. You will find a selection of fittings at the bottom of this page.

Flexible adjustable
A total of 4 relays are available for controlling pumps, valves and other units. For example, the precise dosing of chemicals can be controlled. In addition, 2 analogue outputs (4 to 20 mA) ensure reliable transmission of the measured values for further evaluations. The controller has a wide range of control options so that no additional controllers are required. Relays can be assigned the following functions: ON/ OFF; over/under; PWM controller; PFM controller. mA outputs: linear range, continuous controller.

Temperature fluctuations
For pH measurements in media with strongly fluctuating temperatures, measuring fittings with temperature compensation are used. The VARIOCON is already equipped for this application. All that is needed is to connect an NTC temperature sensor to the VARIOCON. The compensation is activated via programming and is then carried out automatically. Even large temperature fluctuations in the measured medium no longer have any influence on the measurement results.

MiniCal III CS

The installation of the robust MiniCal III CS fitting is quick and uncomplicated. A butterfly valve is installed on a pipe socket with DIN flange according to the installation instructions and enables subsequent service and maintenance work during operation.

A gas-permeable membrane separates the water circuit from the measuring chamber and is adapted to the prevailing operating pressure (max. 3 bar). HFCs / CFCs are inert gas mixtures that do not mix with liquids. The detection of HFCs / CFCs, such as R12, R22, R134a, R402a, R404a, R407c, R406a, R507, is done with selective gas sensors that can also detect low gas concentrations (depending on the type of gas and sensor).

Appropriate safety actions can be initiated at an early stage, thus preventing hazards to people, the environment and plant components. The integrated gas sensor supplies a 0.2 to 1 or 4 to 20 mA signal for the alarm, which can be connected to an evaluation unit or directly to a PLC.

Key features at a glance:

Simple installation and operation
Compact and robust design
Made for synthetic refrigerants
Measurement up to an operating pressure of 3 bar
Mounting on a pipe socket with DIN flange
Output signal 0.2 to 1 or 4-20 mA

MiniCal III Immersion Fitting

The MiniCal III immersion fitting is custom-made and available in lengths up to 250 cm. It is easy to install and just as easy to use. The electrodes are simply screwed into the fitting. Freely programmable settings such as probe calibration, selection of measuring media (water, water/glycol mixtures), test functions via mA output etc. are built into the housing connection head of the immersion fitting. The fitting is made of PVC material and is suitable for a temperature range of +5 to +50 °C.

Key features at a glance:

Simple installation and operation
Compact and robust design
Measurement in open basins and bodies of water
Comes with optional flange mounting or pipe clamp
Accommodates two electrodes – NH4 and reference electrode
Signal preamplifier/microprocessor mounted on fitting in housing
Output signal 4-20 mA

MiniCal III Flow Fitting

The robust MiniCal III fitting is suitable for unpressurised pipelines, easy to install and just as easy to use. The electrodes are simply screwed into the fitting. A baffle plate is also integrated to protect them from excessive inflow and particles (e.g. from sand). A cleaning opening also enables quick and easy maintenance. The fitting is made of PVC and is suitable for a temperature range of +5 to +50 °C.

Key features at a glance:

Cleaning opening
Electrode will not dry up
Accommodates two electrodes – NH₄ and reference electrode
Easy installation and operation
Compact and robust construction
Signal preamplifier/microprocessor mounted on fitting in housing
Output signal 4-20 mA

MiniCal III Bypass Fitting

A partial flow of the medium is guided through the MiniCal III bypass fitting and pumped back into the pipeline. This means that the installation location can be selected flexibly. Depending on the local conditions, the fitting is mounted either below the pipeline or on the wall.

A requirement for the early detection of an ammonia leakage is the regular exchange of the medium in the measuring chamber. A partial flow of the medium is passed through the fitting as soon as the upstream solenoid valve opens. By setting the interval and the opening time of the solenoid valve, a regular exchange is achieved. After the measurement, the medium is pumped back into the circuit by a high-pressure pump to avoid coolant losses.

The monitoring of the pump and the solenoid valve allow a control of the flow. The bypass fitting is designed for a pressure range of 1 to 6/10 bar and a temperature range of -10°C to +50°C.

Key features at a glance:

Flow control
Regular medium exchange
No loss of coolant
Simple installation and operation
Measurement in pipelines from 1 to 6/10 bar
Signal preamplifier/microprocessor mounted on fitting in housing
Service and maintenance without process interruption
Output signal 4-20 mA

MiniCal III

In order to avoid consequential damage and not endanger production processes, ammonia leakages must be detected and repaired at an early stage. For this purpose, measuring devices for ammonia detection are integrated into the secondary cooling circuit. The MiniCal III system was developed specifically for this purpose. Intensive cooperation with operators of cooling systems and extensive experience have resulted in a powerful and user-oriented system that is quick and easy to install.

Selective measurement for early warning
In order to be able to reliably detect ammonia leakage, the selective measuring method directly in the secondary circuit has been proven. The MiniCal III system measures a leakage selectively (0.2 ppm) even in the smallest concentrations, whether in normal water basins, in circuits or in brine mixtures such as ethylene glycol, propylene glycol, Tyfoxit, Pekasol, etc.

Basically, a difference is made between detection in water circuits and water/brine circuits. In both cases, electrodes with selective membranes are used. Due to the reaction of ammonia with the cooling medium, ammonia detection is carried out either with an ion-selective ammonium electrode or a gas-sensitive ammonia electrode, depending on the medium and the pH value. This allows an absolutely reliable statement to be made about ammonia leakage.

Measurement method
The ion-selective measuring method of the MiniCal III system measures an effective concentration in the cooling circuit in ppm (parts per million). This is very important in order to avoid damage to the cooling system. Only ion-selective measurements allow the smallest detection of 1 ppm. At limit values of 3 ppm in open systems (cooling medium from lakes or rivers) and 20 ppm in closed systems, safety actions must already be taken.

Ammonia leaks are detected reliably and early with selectively measuring electrodes. As the diagrams show, ammonia detection with the pH value is only possible above 100 ppm or 1000 ppm ammonia, depending on the medium. By using the selective measurement method with the MiniCal III system, an earlier warning is possible in order to initiate appropriate actions.

In brine or glycol circuits, pH measurement is not suitable, because substances with a basic or acidic effect are buffered. The pH value remains constant until the buffer capacity is exhausted. Therefore, a change in the pH value can only be measured at higher ammonia concentrations. This measuring technique also has a higher sensitivity in water circuits, so that even smaller leaks can be detected at an early stage.

Signal amplifier
The measuring signal of the MiniCal III system is connected to a measuring amplifier/controller. This forwards the alarms to a higher-level control centre. The system informs about the measured concentration at any time, about the respective operating states if the limit values are exceeded and about flow disturbances. If the alarm limit value is exceeded, appropriate actions are initiated.

In addition, there is a signal pre-amplifier, which is mounted directly on the respective fitting. This provides an on-site display and reduces interference between the measuring chain and the controller.

Fittings and installation locations
The selection of MiniCal III fittings depends on the installation location. The medium is tapped from pipelines with return in the same, in basins or with free outlet. They can be used flexibly, are easy to install and are characterised by a compact design. You will find a selection at the bottom of this page.

Key features at a glance:

Key features at a glance:

Key features at a glance:

Key features at a glance:

Key features at a glance:

Key features at a glance:

Key features at a glance:

Key features at a glance:

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