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This months special deals have got to be the best yet!!!
For Waste water treatment plants:
Composite Sampler for inlet flow +
DataTaker logger for monitoring plant and alarms +
Dissolved Oxygen probe for treatment control +
Composite Sampler fot outlet flow
Budget Price: € 5,000
Please email for details sales@omniinstruments.ie
For Water reservoirs / pumping stations:
Water level sensor (submersible) +
Radio Transmitter +
Radio Receiver with setpoint programmable relay outputs +
DataTaker logger for monitoring and alarms.
Budget Price: € 4,600
Please email for details sales@omniinstruments.ie
OxyGuard Handy Series of Portable DO Meters
All with a discount of 30% (limited period only)
Please email for details sales@omniinstruments.ie
TESTO METERS
20% discount on selected meters
Please email for details sales@omniinstruments.ie
Why not contact us with your application and let us do a special deal for you.
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Omni Instruments are pleased to announce the arrival of the OT21 combined oxygen and temperature probe.
Both oxygen and temperature measurement for your compost facility
with just one instrument.
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| The increasing emphasis on environmental considerations is making the monitoring of windrow conditions essential. Two important factors in proper windrow management are oxygen and temperature.
The OT-21 allows you to easily monitor these two factors through a single, rugged stainless steel probe and weather resistant monitor. Results are viewed on an integral digital LCD display. Why monitor oxygen and temperature?
Monitoring is important in order that you can:
1. Optimise the composting process, thus increasing throughput and revenues and reducing the potential for complaints about odours.
2. Provide documentation to regulatory agencies, establishing evidence of a well organized and properly managed operation
3. Provide historical records to indicate aerobic conditions in the composting process.
Aerobic conditions in the composting process?
Composting is the biological process in which microbes consume plant and vegetable materials and convert it into useful organic material and other by-products. Essentially there are two types of microbes that do this. They are commonly referred to as aerobic and anaerobic microbes. The aerobic microbes thrive in oxygen environments while anaerobic microbes thrive in oxygen deficient environments. This distinction is very important. Composting by aerobic microbes converts organic material into stable humus, carbon dioxide and water. Composting by anaerobic microbes, on the other hand, converts organic material but produces methane, hydrogen sulphide, ammonia, etc, which have unpleasant odours. Generally, oxygen content of 5 to 12% is acceptable for aerobic activity. Thus, maintaining proper aerobic conditions, as well as a proper diet for the aerobic microbes ensures that decomposition will occur efficiently and quickly while reducing objectionable odours.
What is a 'proper diet' for these microbes?
Generally, a proper diet consists of organic materials with the proper carbon/nitrogen ratio of about 25 to 1. Thus, during spring and summer, when yard wastes are predominantly green grass, a carbon source of wood chips, sawdust, or leaves, etc. should be added. In addition, proper moisture content is very important. Generally, moisture content of 45-60% is ideal for optimum microbial activity. During dry periods, water should be added to the compost. Conversely, during excessively rainy periods, the compost pile should be turned more frequently to dry out the compost and to aerate it.
Additionally, the compost material should be ground or shredded into smaller pieces, as this allows the microbes to digest the material quickly.
What about temperature?
The high temperatures encountered in the compost pile are the result of microbial activity decomposing the organic materials. In general, temperatures between 55 and 75 degrees Centigrade are encountered in working compost piles, with the ideal temperatures being between 55 and 60 degrees C. Temperature measurement will give an indication of the proper balance of oxygen, moisture, and food content for the microbes. Thus, if oxygen and moisture are maintained at proper levels, but the temperature begins to decrease, the indication is that the food supply for the microbes is diminishing. When temperatures reach 40 degrees C or less, the composting process is nearing completion.
The high temperatures achieved in a properly managed compost pile are beneficial because they kill weed seeds and reduce pathogens.
OXYGEN-TEMPERATURE-MOISTURE
Factors that interact and must be monitored and controlled:
Too much oxygen -decreases temperature and moisture
Too much moisture - decreases oxygen and temperature
Too little moisture - decreases temperature and increases oxygen
Too little oxygen - decreases temperature
WEATHER is a very big factor in managing a compost site. Unfortunately Omni Instruments can't help you in controlling it! But we can help you with the other important factors, OXYGEN AND TEMPERATURE.
Use the Model OT-21 Oxygen-Temperature monitor to keep aerobic microbes active and decrease composting time, reduce odours, kill weed seeds, and reduce pathogens.
Not only will you save on the overall composting time, you will save time in taking measurements. You only use ONE instrument to take both oxygen and temperature measurements. You get results on a DIGITAL display. You get the results FAST.
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| Oxygen range of 0 - 22%
Temperature Range of -15 to +95 degrees C.
Fast response time
Long life oxygen cell
13mm high digital LCD display
Single 9 volt alkaline battery operation
with Low Battery Indicator
Rugged 1.5 metre long 10mm diameter
stainless steel detachable probe
Solid state temperature sensor at probe end
Removable plastic filter probe tip |
Easy oxygen calibration
Neoprene aspirator
Steel and aluminum monitor construction
Laminated vinyl finish (not painted)
Gold plated probe contacts
Gold plated switch contacts
Adjustable carrying strap
Weather resistant construction
Monitor LxWxH - 165mm x 105mm x 35mm
6 months warranty against all defects |
Probe assembly as standard is 1.5 metres long and is easily detachable. Custom lengths are available on request. Probe and monitor assemblies may be purchased separately.
Farenheit temperature display is available on request.
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OPERATION
1. Remove monitor and probe assembly from packaging.
2. Attach probe assembly to monitor:
A. Align monitor and probe connectors. Note that they are keyed.
B. Push on serrated ring and twist clockwise until seated.
3. The control switch is located on top of the monitor, under the red weather seal. The switch is a 3 position momentary switch. The normal position is the 'OFF' position. Pressing down or rocking the forward portion of the switch 'T' activates the temperature mode. Pressing down or rocking the rear portion 'O' of the switch activates the oxygen mode.
4. As the oxygen cell "wears", periodic calibration is needed to compensate for this. It is suggested that calibration be checked prior to each session of use. This is done by activating the 'oxygen' mode, aspirating (squeezing and releasing the rubber bulb) several times and noting the display reading. If the reading is other than 21% (normal atmospheric oxygen content), adjust to '21' by turning the oxygen calibration screw with a small screwdriver. 5. To make measurements:
A. Insert probe into compost pile. B. Activate oxygen mode.
C. Aspirate 4-6 times, or until reading becomes steady.
Note and record reading
D. Aspirate 2-4 times. Activate temperature mode.
Note and record reading. NOTE: It is highly recommended that the temperature measurement be made after the oxygen measurement. This allows the temperature sensor more time to respond, since it's response time is slower than the oxygen sensor. This will speed up overall data acquisition.
FIELD MAINTENANCE
1. During use, the air holes at the end of the probe may become clogged (indicated by the aspirator bulb not returning to its normal shape after squeezing). An effective way to clear the holes is to insert the probe into the compost pile, disconnect the probe connector from the monitor, insert the rubber aspirator adapter into the air hole in the probe connector, and aspirate quickly. If this is not effective, follow the instructions below on removing the probe tip and cleaning.
REGULAR MAINTENANCE
1. Before storage, disconnect the probe, hold the monitor in a vertical position (display facing up), aspirate 3-5 times to expel any accumulated moisture.
2. Remove the tip as shown. Remove any debris from the tip brush. With a paperclip or other object, clean the side holes of any debris. If a compressed air source is available, blow air through the large air hole at the connector end. Do not insert any objects into the air hole in the connector or inside the metal probe.
BATTERY REPLACEMENT 
A low 'BAT' indicator will signal when the battery needs to be replaced. 1. Remove two screws and battery cover. Pull out the battery and disconnect from the connector. Connect a new 9 volt alkaline battery, and insert into the battery compartment. Replace cover and screws.
OXYGEN CELL REPLACEMENT
When calibration to '21' can no longer be achieved, the oxygen cell needs to be replaced. Use only an exact replacement cell (available from Omni Instruments).
1. Remove two screws holding the rear panel to the monitor. Carefully pull the rear panel assembly back, exposing the oxygen cell.
2. Disconnect the connector, cut the wire tie, and swing the wire clip from the cell. Remove the cell and the gasket from the cell.
3. Place the gasket on a new cell. Install the cell and retain with the wire clip. Install a new wire tie and plug in the connector.
4. Carefully push the rear panel assembly into place and secure with the 2 screws. |
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