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Products and Services for Fisheries - The Environment - Aquaculture - Waste Water Treatment Water Quality TestingOxygen The measurement of dissolved oxygen, DO, is essential to monitor and maintain the health of the aquatic environment. Low DO can result in poor appetite, growth and poor health of fish. The measurement of DO is important in the use and monitoring of management tools, such as aeration devices. In fisheries, low DO results in poor catches, and therefore angler revenue. The detection of low DO can warn of impending, preventable problems, such as the collapse of algal blooms, or proliferation of zooplankton. Dissolved Oxygen Meter and Probe An inexpensive way to measure DO. This long-established methodology (the Winkler Method) involves the mixing of reagents with the water sample, gives accurate and reliable results, and can be done in the field. Ammonia, Nitrite, Nitrate Ammonia is an important waste product of fish, and a by-product of some decomposition processes. Its importance relates to its toxicity to fish, and other aquatic organisms. In aqueous solution, it is present in balance in 2 forms; ionised ammonium (NH4+) and the unionised ammonia, NH3. The latter is much more toxic to fish than ionised ammonium. The balance between the 2 forms is affected by pH and temperature. Consequently, there is little point in measuring ammonia alone, without measuring pH. As a toxic waste product of fish, it must be removed from recycling, holding systems. This is done using biological filtration, where a suitable environment is provided for the colonisation of purifying microbes (see Nitrifying Bacteria). These breakdown ammonia into nitrite (also toxic) which in turn is broken down by different microbes into relatively harmless nitrate. All 3 compounds are aquatic nutrients, and support aquatic algae (green-water and blanket weed) and water weeds. Man's activities, through agriculture and sewage disposal, often enrich water bodies with these nitrogenous compounds. Colorimeters take the operator-error out the measurement of the colour results of sample testing. Individual colorimeters are available for all of the above parameters. However, we can offer a very economic way to measure most of the parameters important to the fish environment; the C103. ammonia, high and low range copper, high and low range nitrate nitrite, high and low range dissolved oxygen phosphate, high and low range pH Let us know your requirements, and we can give further guidance and a quotation Contact us Where the water sample is clear, a colorimeter is an inexpensive way to measure DO. Reagents are added to the water sample, and the resulting colour is measured by the instrument. This removes the need for the subjective assessment of colour comparisons. Dissolved Oxygen Test Kits The monitoring of ammonia, nitrite and nitrate is therefore important in aquaculture, fishery management and fish holding. We can offer a broad range of instruments for the measurement of pH, ranging from spot-checkers, to inexpensive, continuous monitors pH chlorine, free and total Colorimeters The C103 is a new bench-top, multi-parameter colorimeter that can be used to measure all of the following: Dissolved Oxygen Colorimeter NEW Oxygen tester
Oxyguard Products A range of equipment for the measuring, monitoring, alarm, control and data logging of dissolved oxygen. There is a very wide range of equipment available, some of which is described here.
This range of meters and probes have been designed to be highly accurate, yet practical for use in typical field applications such as AQUACULTURE, FISHERY MANAGEMENT and the WATER INDUSTRY. Key Benefits: easy to use - Special, no-warm-up probe means it is always ready for measurement Round design fits comfortably in the hand Flat foil push buttons, easy-wipe Illuminated display* Clip for convenient belt- or clip board-fixing waterproof- completely sealed - it floats, if dropped in the water! - flat foil seals the the front, O-ring seals the rear cover strong- case machined from a solid block of POM plastic * not Alpha Models Alpha expresses O2 as ppm (mg/l) and % saturation Beta as Alpha, plus temperature and illuminated display Gamma as Beta, plus salinity compensation Delta as Gamma, plus data logging, barometric pressure compensation, time and date Technical Advantages No microprocessor programs to run through - just press the button and measure ! Fits comfortably in the hand with no protruding knobs. Flat-foil, easy to use. wipe-clean push buttons Waterproof. Can be used in any kind of weather. Submersible, and even floats, if dropped in the water ! Galvanic type probe with no warm up time - always ready for use ! Fully temperature compensated - no dials to set Very quick response time Probe is stored dry, therefore easy to obtain quick and reliable calibration Excellent long term stability - one daily calibration check sufficient Tough probe membrane - can be wiped clean with a cloth or paper Probe does not need regular service or renovation Runs for more than 1000 hours on standard 9v battery Illuminated display (Beta, Gamma, Delta) Special highly flexible cable Specifications Probe type Galvanic cell, self-polarising, self temperature compensating Cable length Standard 3m. Any length available on request Operating conditions Probe: -5 to + 50°C, meter -20 to 50°C Measuring range Standard: 0-50.0 ppm (mg/l) and 0-600% saturation. Will indicate up to 199.9ppm (mg/l) and 1999% saturation Accuracy: Measurement accuracy depends on calibration accuracy. Typically better than +/- 1% of measured value +/- 1 digit within the standard measuring range Repeatability Typically better than +/- 0.5% of measured value Response time 90% of end value in less than 10 seconds Accuracy, temperature +/- 0.2°C (Beta, Gamma and Delta) Salinity Compensation 0-50 ppt salinity. Set using push buttons (Gamma, Delta only) Dimensions 96mm diameter x 36mm + belt clip (if used) Standard accessories Spare membrane cap, membranes, electrolyte and storage bag Data logging (Delta only) Manual (event) or automatic (time interval, from 2 to 60 minute intervals) Oxygen Monitoring the probe The success of any monitoring begins with the probe. Oxyguard have their own special design which can work successfully in tough environments, with minimal maintenance. The membrane is so tough that it can wiped clean with a cloth, tissue or even a thumb ! The probe is an active galvanic cell that generates an electrical signal proportional to the oxygen pressure it senses. It does not draw electricity, as it it generates it's own. It is connected by a 2-core cable, which can be as long as required (to order). These probes need only occasional calibration, and go for years without renovation. This process is inexpensive and easy - even for the inexperienced. the transmitter The transmitter is the "brain" of the system, and produces an analogue output signal for each probe channel. This can be used for connection to remote displays, dataloggers, computers, etc. Each transmitter has outputs for high and low alarm, as well as for the control of aerators, automatic valves, etc. The transmitter makes possible regulation and alarm monitoring duties. The alarm memory function shows if any parameter was out of limits at any time. multichannel systems Oxyguard 6 and 8 can be fitted with up to 6 or 8 channels respectively. benefits: Flexibility. By being modular, units can be combined. There is no maximum to the number of channels Control facility. Each channel has a changeover contact to operate aerators/oxygen enrichers and other equipment Security. Alarm facilities (individual low-, common high-, and common low-, main-fail) Can also be connected to emergency standby 24v battery. Switched over automatically on mains fail. Each channel is isolated and will not affect others, in the event of transmitter failure. Data logging and recorder equipment easily connected. Oxyguard Zero Budget system for simple measurement and display of oxygen levels. Will accommodate up to 12 probes. Ideal for use in fish transport trucks or boats. Note that Oxyguard Zero has no alarm facilities. Oxyguard PLC This system is ideal where there are a very large number of points of measurement. The unit is compact, and is microprocessor-controlled. It can work alone, or be connected to a PC, which allows extensive datalogging and a comprehensive overview of the facility. Subject to change without notice For more complete information, see the Oxyguard web site; www.oxyguard.dk |
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| Spirex Aquatec Ltd Bradley Green
, Redditch
, Worcestershire, B96 6TN, United Kingdom - Show Map - Tel: +44 (0) 1527 821 601 Email: info@spirexaquatec.com Member of the Institute of Fisheries Management. Company Registration Number 4524471. Registered in England and Wales. VAT Number GB803548439. |
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