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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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 mm sensores, serial connetion, 9 V  battery with warning and external energy connector. Tansport boxes are available as accessoire. The meters GMH-34 and GMH-35 are also available as waterproof versions with or without alarm and logger function.

The following meters are available as standard:

Typ/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 ... 100 % r.H.;
Air temperature: 0 ... 120 C;

Conductivity: 0 ... 2000 S/cm
or 0,0 ... 200,0 mS/cm;
Temperature: 0 ... 100 C;

Option -
Salinity: 0 ... 70 mg/l;
TDS: 0 ... 1999 mg/l;
Resistance: 0,005 ... 100,0 kOhm;

PH-value: 0,00 ... 14,00;
Temperature: -70 … +250 C; -94 …+482 F;

Option -
Redox: (ORP): -1999 ... +1999 mV;
rH: 0,0 ... 70,0 rH;

Oxygen: 0 … 25 mg/l (ppm)
and 0 … 250 %(sat);
Temperature: 0 … 50 C;

Option -
Air-Pressure: 0 … 1200 hPa,
(0 … 900 mmHg);

Precision: 1Digit;
1,0% f. SV
3,0% f. MV
Conductivity: 0,5% f. MV 0,3%FS;
Temperature: 0,2% f. MV 0,3K;
0,1mV, rH;
1,5% (mg/l or %);
0,5% FS (mbar);
0,1C (C);
Sensor: 5 m cabel and connector 1 m cabel fixed to the meter 1 m cable per sensor 4 m cabel and connector
(other sizes on request)
Other: Air and Wind measurement on request.
Automatic conductivity measurement in the optimal range. Automatic or manual temperature depending 2- or 3-point calibration. Manual pressure and salinity compensation  (automatic with option).


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.
System requirements:: IBM compatibe AT, min. Pentium II, approx. 20 MB free disk space, 3.5” floppy disc drive, VGA graphic card, Windows 3.1 or higher, serial connection “COM1” or “COM2”.


OxyScan "light"GRAPHIC MICROPROCESSOR METERS for oxygen, temperature, pressure and ph-value

This "OxyScan" micro dissolved oxygen meters are specially developed for the use in aquaculture and limnology. Through the very stable splashproof cover made from ABS plastic and the delivery including plastic transport case as well as the plastic sensor (14 mm , 150 mm long with 2 m cable and connector) with a very long sensor life (approx. 2 years standby time, physically) they are perfect for field work.
The full graphic display makes the result clear and fast visible. The short polarisation time (approx. 30 sec. max. 5 min.), the low flow current sensitivity (1 % at 5 cm/sec.) as well as the air-pressure and temperature compensation in the range of 5 - 40 C makes working easy. The automatic calibration with the included calibration chamber is an additional feature.
A free-configurable switching output (24 V DC / 2 A or 230 V AC / 1 A) and exact analogue output or an extended measurement range (up to 199,9 mg/l) are options for all these meters. This meters can also be configured as you wish, e.g. storage, specific control-logic (with switch outputs), customer-specific data format, but it is also possible to extend this system anytime. As options are also available: stainless steel sensors 4,7 to 5,4 mm , 80-400 mm long  with 1,5 to 5,0 m cable and connector (other cable lenths on request).

The following models are available as standard:

Typ/Model OxyScan "light" OxyScan "graphic"
Measurement: Oxygen (0.0-19.9 mg/l and 0.1-199.9 %sat),
Temperature (0.0-50.0 C);
Oxygen (0.0-19.9 mg/l and 0.1-199.9 %sat),
Temperature (0.0-50.0 C),
Air-Pressure (150-1150 mbar);
Precision: +/-1 digit;
(0,1 mg, 0,5 %sat, 0,5 C);
+/-1 digit;
(0,1 mg, 0,5 %sat, 0,5 C, 10 mbar);
Display: Large full graphic-display with 120 x 32 pixels,
Memory function for up to 50 single-values, displayed directly on the display as diagram or single values;
Huge full graphic-display with 128 x 64 pixels, diagrams show the last 30 values;
Memory function for up to 4000 seria-values, displayed directly on the display as diagram or table;
Measurement intervals from 2 seconds up to 10 minutes, starting time and date to set;
Furnish: Manual atmospheric pressure compensation;
Standard (9 V DC) battery for approx. 500 h;
Battery warning on the meter;
Automatic atmospheric pressure compensation;
NiMH-accumulator, 2100 mAh (Operating time > 24 hours);
Inclusive fast-charger (charging time about 4 hours);
Battery-monitor on the meter;
Memory keeping (memory active up to 6 months, depending on the measurement period);
Real time clock with date function;
Wireless Infrared-Interface capability for connection with infrared devices;
Options: RS-232 interface for transmitting actual and saved measurement values to PC, notebook or printer etc.;
Connector for external power supply with (8.2 V DC) accumulator;
Infrared-receiver with USB adaptor for non infrared devices;
Single value memory function;
Illuminated display (backlight);
PH-value or Redox measurement;


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 an 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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