Aquaculture Technology

Monitoring Systems



Waterproof Pocket Tester (pH + C)WATERPROOF TESTERS for aquaria and aquaculture

These waterproof (IP67) and pocket size testers (153 mm long, 24 mm diameter, weight just 45 g) with digital display are ideal for aquaria or aquaculture and any other field applications. There are different models with replaceable electrode and automatic temperature compensation available that read conductivity or salinity (0-1999 S EC or 0,0-199,9 ppm TDS), pH-value and temperature (0.00-14.00 pH and 0.0-50.0 C) or redox potential ( 1000 mV ORP) at an affordable price. The tester are factory calibrated, but can be manually calibrated and measurements are highly accurate (0.1 or 2 % or mV) with high resolution (1,00 to 0,01). The modular design allows easy electrode and battery replacement. A rugged splash-proof and floating casing prevents water infiltration. All the testers work with common batteries (3 x 1.5 V) and have a long live.


Compact Analysis BoxTEST BOX for the water analysis

This Compact-Laboratory box set is equiped with liquid colour analysis tests of: Oxygen (Demand + Dissolved), Hardness (Total + Carbonate + Residual), pH-value, Ammonia, Nitrite, Nitrate, Phosphate, and Temperature.

All tests are also available as single or replacement units and additionally test sets for: Aluminium, Arsen, Lead, Chlorine, Chloride, Cyanide, Iron, Calium, Copper, Magnesium, Manganese, Nickle, Sulfate, Sulfite, Zink, Zinn etc.

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Photolyser box setDIGITAL PHOTOMETER for various water parameters

For the necessary manual analysis, this microprocessor photolyser meter with professional concept and high precision is the right coice. Just select the required program on the foil pushbuttons. The display shows the parameter and dimesions exactly (to 2 digits behind the got). An acustic sign informs when the reaction time is finished. The results are displayed on the meter and can be stored for later processing. The meter is equipped with a  RS-485 adaptor. Via an additionaly integrated RS-232 adaptor the meter can be connected to a printer or PC (cable as accessoire available). It is possible to archive over 500 stored data sets with date and time for up to 16 tanks. The meter has a 0-point-memory, which needs no new calibration. This photolyser works with 4 usual 1,5 V batteries, with integrated capacity monitoring on the meter. Alternativly accumulators or an connector for external power supply is available (as accessoire).

Aluminium 0-0,5 mg/l, Ammonia 0-0,5 mg/l, Bromine 0-10 mg/l, Chlorine 0-5 mg/l, Cloride 0-250 mg/l; Copper 0-1 mg/l, Hardness 0-500 mg/l; Iron 0-5 mg/l, Manganese 0-0,03 mg/l, Nitrate 0-100 mg/l, Ozone 0-1 mg/l, Phosphate 0-4 mg/l, pH-value 6-8 and Acid-potential 0-5 mmol, etc.

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WATERPROOF METERS for easy measurement

Waterproof  MeterAt the development of this new series of handheld meters we concentrated on the most important functions of the measurement technique. The pure measurement with the focus on precision, fastness and durability packed in a stable ABS-housing 108 x 54 x 28 mm (LxWxD), weight approx. 130-200 g (without sensor) with 4 simple touch-buttons, allows for an extraordinary relationship of price to value. This functional meters have a modern and egonomic design, are dust- and weaterproof (according to IP65/67) and have an illuminated 3-line display (accuracy: 0,5-1,5 % resp. +/- 1 digit at a norm temperature of 25 C) with battery status. The meters have additional features, such as: automatic min-/max-value memory, hold-function, and an overhead display on push-button. This reasonable priced meters are delivered completely ready to use incl. battery (type AA), cable and sensor (12 mm ). Transport cases are available as accessoire.

Type/Model GEC-14 Conductivity-meter GPH-15 PH-value-meter GDO-16 Oxygen-meter GTE-17 Temperature-meter
Measurement: Conductivity: 0 - 2000 S/cm or
0,00-20,00 mS/cm;
Salinity: 0,0 - 50,0 mg/l;
TDS: 0 - 2000 mg/l;
Temperature: 0 - 100 C;
PH-value: 0,00 - 14,00. Oxygen: 0,0 - 20,0 mg/l;
Satturation: 0 - 200 %;
Temperature: 0 - 40 C.
Temperature: -70,0 - 250,0 C.
Sensor: Graphit-sensor with 1 m cable fixed to device Gel-sensor with 1 m cable and connector Galvanic-sensor with 2 m cable fixed to device Dip-sensor with 1 m cable and connector
Other: Automatic temperature compensation;
Automatic measurement range switch.

Option -
Controll solutions.
Manual temperature compensation.

Option -
Sensor for deept water (submersible);
Calibration solutions (pH 4, 7, 10);
Cleaning solutions.
Automatic temperature compensation;
pressure compensation;
Manual salinity compensation.

Option -
Protection cap for sensor;
Electrolyt solutions.
Automatic switch-off function
deactivate and adjustable;
Acustic alarm function;
Housing in yellow colour
Option -
Stitch-sensor (1,5 od. 3,0 mm );
Surface-sensor (2,3 mm );
Screw-sensor (6,0 mm ).


ELECTRONIC METERS for many water parameters

GMH meterAll this electronic GMH devices have a size of 142 x 71 x 26 mm (LxWxD) and a weight of approx. 155/255/300 g (incl. battery/sensor), and have a LCD doubble display for measured values and temperature, min-/max-value memory, configurable automatic switch-off function (1-120 min), hold-function, foil pushbuttons, automatic temperature compensation, 12-15 mm sensors (precision +/- 1 digit), serial connetion, 9 V  battery with warning and external energy connector. Tansport boxes are available as accessoire. The meters GMH-34 to GMH-36 are also available as waterproof versions with or without alarm and logger function.

The following meters are available as standard:

Type/Model GMH-33 Flow-meter GMH-34 Conductivity-meter GMH-35 PH-value-meter GMH-36 Oxygen-meter
Measurement: Flow: 0,05 ... 5,00 m/sec.

Option -
Air humidity: 0,0 ... 100,0 % r.H.;
Air temperature: -40,0 ... 120,0 C.

Conductivity: 0 ... 2000 S/cm
or 0,0 ... 200,0 mS/cm;
Salinity: 0,0 ... 70,0 g/kg;
TDS: 0 ... 1999 mg/l;
Resistance: 0,005 ... 100,0 kOhm;
Temperature: 0,0 ... 100,0 C.
PH-value: 0,00 ... 14,00;
Redox: (ORP): -1999 ... +1999 mV;
Hardness: 0,0 ... 70,0 rH.

Option -
Temperature: 0,0 … 150,0 C.
Oxygen: 0,0 60,0 mg/l (ppm);
Satturation: 0 … 600 %;
Air-Pressure: 10 1200 hPa;
Temperature: 0,0 … 50,0 C.
Sensor: Anemo-sensor with 5 m cabel and connector Graphite-sensor with 1 m cabel fixed to the meter KCl-sensors with 1 m cable and connector Galvanic-sensor with 2 m cabel and connector
Other: Air measurement as accessory;
Wind measurement on request;
Telescopic sensor on request.
Automatic temperature compensation,
Automatic cell correction.
Automatic temperature compensation (option);
Automatic calibration.
Automatic temperature compensation;
Automatic pressure compensation;
Manual salinity correction.


In connection with a PC, a meter of the GMH-seria, the PC-interface adaptor (accessorie) and this software, a comfortable and reasonable data collecting system can be build (registration of data also over many years possible).
The software includes two modules: “Schreiber” (Writer) and “Datenanzeige” (Data display).
Modul “Schreiber”: Displays the data as y/t-diagram.
Modul “Datenanzeige”: Scanning of collected measurement values and display as y/t-diagram.


MICROPROCESSOR METERS for professional monitoring

OxyScan 300 "Laboratory" with plastic oxygen sensorThis improved meters were specially adapted for use in aquaculture and limnology. The compact (L x W x H 165 x 83 x 34 mm, approx. 305 g) splash-proof cover (IP 54), the plastic sensor (14 mm , 150 mm long, with 1.5 m cable), the very long sensor life (approx. 2 years standby time), and the delivery with NiMH-batteries (2 x AA Mignon) and USB-cable with charger in transport case, make these meters perfect for field work or laboratory use. The large graphic multi-display makes the readings available clearly and quickly. The short polarization time (approx. 30 sec. max. 5 min.), the low flow current sensitivity (1 % at 5 cm/sec.), the high precision +/-1 digit (0.1 mg, 0.5 % or C), as well as salinity correction, automatic air-pressure and temperature compensation (in the range of 5-40 C) makes working easy. Automatic calibration with the calibration chamber (included) is an additional feature. Options include stainless steel sensors (4.7-5.4 mm), and other cable lengths available. To enable you assigning measured values geographically, these meters are available with or without GPS.
This modern devices have: an electronic compass, a data logger with adjustable start/stop time and measuring intervals between 5 sec. and 10 min., with automatic storage of all measured values ​​(approx. 3 months during battery operation, also mains operation possible), a large internal memory (32000 locations), and an individual measured value storage on key press with 1000 memory locations. Additionally, radio controlled (RC) switching outputs for standard RC sockets and acoustic signals, for up to 4 RC sockets with separate two-point control for oxygen (absolute or relative), conductivity, temperature or air pressure, two additional alarm outputs, which trigger a standard RC bell when the set values ​​are exceeded or subtracted, and two additional channels for optical and/or acoustic alarm on the meter. The power-saving graphics display (transflective with background lighting) with best readability even in direct sunlight, and adjustable contrast, activates automatically display and background lighting when the device is moved (can be switched off). The beep (alarm and key tone) volume and frequency is adjustable. PC-software for data visualization and data export included (with free online software update).

The following models are available as standard:

Type/Model OxyScan "Outdoor" OxyScan "Laboratory"
Measurement: Oxygen 0,00-25,00 mg/l and 0,00-250,00 %sat,
Temperature: 00,00-60,00 C;
Air-pressure: 50,00-1150,00 mbar;
Oxygen: 0,00-25,00 mg/l and 0,00-250,00 %sat,
Temperature: 00,00-60,00 C;
Air-pressure: 50,00-1150,00 mbar;
pH-value: 00,00-14,00 or
Redox-potential: -500-+500 mV;
Precision: +/- 1 digit
(0,01 mg, 0,1 %, 0,1 C, 0,5 mbar)
+/- 1 digit
(0,01 mg, 0,1 %, 0,1 C, 0,5 mbar, 0,1 pH, 0,3 mV)
Options: GPS;
Cable extentions.
Cable extentions;
Stainless steel oxygen sensors;
Optical laser oxygen sensor with conductivity measurement;
Connection box for up to 4 oxygen sensors.


Optical Oxygen SensorOPTICAL DISSOLVED OXYGEN SENSOR to connect on systems or computers

This new development is the first optical oxygen sensor with SCS interface (Simulation Clark-Sensor), for a perfect integration into running systems. The ideal substitute for your existing oxygen sensors. Via the SCS interface downward compatible to classic oxygen sensors (galvanic isolation), works together with classic transmitters. Additionally, the sensor can be connected via the 4 to 20 mA current output or with a process control system (SPS). As acessoire, a PC-adapter (USB-RS485) is available, with which the sensor can be connected directly to a personal computer, and configures from there (Software for free), where just a net-device is needed and no external meter. The calibration is simple and only needed once as the calibration data can be stored in the sensor. The robust and simply exchangeable sensor cap has a warranty of 2 years. It guarantees stable values at once, little drift, quick reaction time, and all independent from incoming flow. The sensor has no no sensitivity towards H2S or CO2, but an automatic temperature compensation and malfunction diagnosis. Measrement range 0-20 mg/l, 0-200 % sat., resolution (at 25 °C) +/- 1 %, limit 0.1 %, reaction time < 60 s, temperature range -5 to +50 °C. The sensor can be delivered with an IP68 termination plug or with a fixed cable in different lengths. For mounting in a probe holder the sensor can be delivered optionally with a 1" process connector. For fish farming there is a robust version with a biting-protection with nut inserts available for water depth up to 20 m. A display- and regulation system (for up to 8 sensors) is available as acessoire..


SaturometerSATUROMETER to identifie gas super-satturation in water

This new handheld saturometer (Protection class IP65, with electric backlight display identifies gas super-saturation in water reliably to 250 hPa resp. mbar pressure difference (displayed also in % total gas satturation), with an accuracy of 1 hPa. It works with a usual 6 x 1.5 Lithiumcells, with integrated capacity monitoring on the meter. The maintainance free sensor is compleatly sealed (Protection class IP67, Signal outlet 0-5 V). As option also a pH, carbondioxid- and/or oxygen-sensor can be connected to the meter.
The gas bubble disease is very often present undetected and leads to significant damage in the fish stock. If fish are being exposed to oversaturation continuously, they will suffer from it no matter which gas contributed most to the supersaturation! In experiments it was proven, that a continuous charge with only low levels of supersaturation has a significant negative impact on the fish immune system. A fishstock infected with IPN (Infectious Pancreas Necrosis) produced losses of 10-15 % after 90 days whereas fish from the same stock epxosed to supersaturation showed a mortality rate of 65 %. The gas bubbles themselves cause a lot of direct damages like lesions and embolies. Those alone are lethal in some cases. But in every case they open the door for secondary infections which can not be repelled by a weakened immune system. Another typical sample is a trout breeder who reported fin rot and saprolegnia on the fish body. Measures showed a gas pressure of 45 hPa which equaled to 105 % gas saturation. It may not sound high but the pectoral fins were severely damaged by gas bubble lesions. The fin rot and fungus (Saprolegnia) were clearly produced by an undetected gas oversaturation.

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MULTICHANNEL PROCESSERS for control and management

Wireless Multichannel Process ControlThis very versatile instrument can be used as a stand-alone wirless and solar powered multi channel controller for cages, ponds, tanks and raceways, etc. If there are more than one transmitter units and a base station receiver, then the system automatically configures as a network and sends the information by low powered wireless communication to the base station. The base station has 2 alarm outputs, so it is easy to connected it to a telephone dialer or a local alarm. The base station connects to a PC via a USB, so now you have all the information displayed on your PC and all the results can be data logged.  You can add up to 50 monitor units onto the one base unit, to make a 100 channel network with no wires and no installation costs. This makes for a really low cost simple system and for the first time provides a package ideal for cages, ponds or for any installation that can not use wires. In the event that you get hit with lightening, then generally only one unit will be affected, and if it can not be repaired on-site then you simply send the faulty unit back and replace with a working unit. This means that you are in control of your own system and not dependent on service engineers.
The base station is designed to sit in an office or control room and is connected to a PC by means of a USB cable. The base station communicates with all the transmitters, collects the information and sends onto the PC to data log the information and view the data. The base station has two alarm/control relays so if any one or more of the probes detects a problem, the relays can be activated to trigger your alarm system. The PC does not need to be on for the system to control or alarm. The alarm condition and probe location will be displayed on the base station LCD. One Base station can support up to 50 oxygen transmitters and 100 oxygen and temperature probes.
The transmitter station is a solar powered wireless radio transmitter fitted with LCD display for two oxygen probes, two temperature sensors, two digital inputs and fitted with two relay control or alarm out-puts. The unit will transmit over a distance of at least 300 m. If longer distances are required a repeater may be fitted to take the distance up to 3 km or more. The transmitter is in a self contained IP65 enclosure with its own battery and solar cells. The battery alone will power the unit for 3-6 months, but with the solar cells it will not require a battery change for at least 5 years. A 230 VAC/12 VDC uninteruptable power supply, rated at 2 amps with a 5 amp internal back-up battery for the transmitter module which will the battery will keep running for around 30 days, is available as acessoire.
The robust and easy to use (60 mm large) oxygen probe is a self polarising membrane covered galvanic cell that generates an electrical signal proportional to the oxygen pressure it senses, no matter whether it is in water, air or another medium. It is connected using ordinary cable, which can have any length (up to 1000 m) and does not need an external supply because it makes its own electricity. Cleaning the membrane (with a cloth or tissue) is, apart from an occasional calibration, the only routine maintenance necessary.


MODULAR MULTIPARAMETER measurement and control system

Modular Multiparameter Process ControlWhen it comes to automatically controlling and adjusting critical water parameters, it leaves nothing to be desired. Due to its flexible modular concept, the system is the perfect solution for most applications in aquatic environments. Apart from comprehensive timing functions, it provides measuring modules for the parameters of pH value, redox potential, temperature, conductivity, level (fill level), oxygen and air pressure. Up to eight sensors can be linked to the system in any requested combination. This allows, for instance, simultaneous pH value-measurement and adjustment in eight different pools – which is so far unique. Connection facilities for up to eight measuring modules in any requested combination allows for connecting up to 16 switching outputs (4x4) for control and adjustment functions measured data storage for 2000 measuring chains battery backed computer interface for PC-data evaluation with the software, capable of being network-integrated by LAN adapter, flash memory technology for update-function, automatic sensor identification and sensor testing, day/night simulation, lunar phase simulation, high/low tide simulation, flow simulation, timer clock functions, time interval functions, night modus, acoustic, optical and external alarm, etc.
The system provides greatest accuracy, ease of use, and maximum reliability. The systems are available as measuring/regulation systems with a switch socket and mains adapter for permanent operation. Besides its accomplished design, its practical special functions are thoroughly convincing, too. It is this facility that gives you the overall picture of your past readings thus quickly revealing any trends. The systems can be extended, even at a later date, to form a measuring and regulation system designed for permanent operation, simply by connecting the optionally available power station. An integrated alarm function assures greater safety. You can select an upper as well as a lower alarm setting. If, for whatever reason, one of these alarm settings is reached, the Power Station switch socket will be turned off. At the same time the alarm status will be appear on the display. The result is a reliable and effective prevention of damage. Microprocessor-controlled, Alarm function, Large display panel, Manual / automatic storage of measurements (up to 470 readings), Automatic transition to energy-saving mode when being run on batteries, Battery check, Semi-automatic calibration with sensor test (for pH, redox, conductivity, oxygen), High-quality, low-maintenance sensors.
The software is the central and convenient solution for controlling, adjusting and analyzing all industrial measurement and control systems. At just one glance, the user can check out if everything is okay – and interfere if necessary. Internet connection allows for controlling and adjusting the system even from remote PCs. It allows for analyzing and controlling the data measured by up to 255 industrial systems in one central PC. Allows for configuring all system parameters from PC, allows for status e-mails and SMS alarms, data base and graphical presentation of measured data and measured value evaluation.

Other multimeters and -regulators on request!

Quality is our motto ... and your profit!

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