Page 94 of AES Mastercatalog by Aquatic Eco-Systems

salinity conductivity temperature meter by ysi® the ysi model y30 sct meter is well suited to both field and lab applications the large backlit display makes reading easy under all conditions it is waterproof and if dropped in the water it floats ® salinity meter this salinity meter measures conductivity giving a digital readout in ms millisiemens the table included will give the corresponding reading in both specific gravity and salinity to 62 ppt the permanently connected probe has a 3 cable this meter is temperature compensated for accuracy of ±4 calibrating fluid included uses one 9v battery included weighs only .6 lb and measures 5.5 l x 3 w each 3 water quality salinity/multiparameter meters/tech talk the display shows temperature in ºc along with temperature compensated conductivity micro-ohms and salinity in ppt accuracy is ± .5 percent conductivity ± .1 ppt salinity and ± .1ºc temperature calibration is done with the push of a button comes with six aa alkaline batteries for about 100 hours of operation probes are not detachable measures 10 l x 4 w meter w/10 cable weighs 2 lbs two-year warranty on the meter and one-year on the probe and cable made in the usa calibration solutions sold separately y3010 sm6 pa12 pinpointtm salinity meter ac adapter 115 10 98 9 sm6 salt tester to 10 ppt ship wt each 3 great for measuring salt levels in koi ponds this low-range tester is specifically designed for measuring those difficult low-salt concentrations in koi ponds the tester is completely waterproof and measures salt levels between .1­10 ppt easy calibration trimmer is isolated inside the battery compartment to prevent accidental tampering sensor element is 316 ss and replaceable includes protective case and batteries uses 4 button cell batteries 7 l x 11/2 dia weighs .4 lb six-month warranty calibration solutions sold separately swt2 76 72/3 y3010 y3025 y3050 y3167-e y3168-e y3169-e meter w/10 cable meter w/25 cable meter w/50 cable 1,000 s/cm 1 pint 10,000 s/cm 1 pint 50,000 s/cm 1 pint 4 lbs 5 lbs 6 lbs 699 735 795 18 18 18 664 698 755 tech talk 28 measuring salinity when culturing saltwater organisms less than a 10 percent variation in salinity ±5 or ±2 ppt is often required the measuring methods cover a wide range of cost convenience and accuracy basically salinity is the sum of all dissolved ions in the water not just sodium and chloride expressed as parts per thousand grams per kilogram one measurement method is to titrate chlorinity chloride and calculate the salinity based on the assumption that the composition is the same as seawater usually titrations are based on volumes which can introduce a 2.5 percent error if not done correctly this is much more time consuming than other methods and may be used as a means of checking other techniques density is the basis of the hydrometer measuring method salinity can then be determined from tables based on density specific gravity and temperature refractometers are also density based they provide fast accurate ±1 ppt salinity measurements generally we suggest temperature-compensated models cost and care are the biggest drawbacks calibration using certified seawater is best however fresh water is a reasonable alternative for general aquaculture uses electrical conductivity is another method of determining salinity conductivity measurements are best at 25°c and any difference from this requires compensation if there is a question about temperature compensation simply take a reading change the temperature of the water by 5 or 10 degrees and measure again it should give the same salinity some units give readings in millisiemens ms and require a salinity conversion table others read directly in salinity regular calibration with a standard solution is recommended the information in this tech talk was provided by thomas frakes technical consultant aquarium systems inc saturometer by alpha designed for measuring the total dissolved gases in water this saturometer tensionometer is a must for monitoring deadly nitrogen gas supersaturation can be used for spot checking tanks where supersaturation is suspected not to be used for long term deployment it is lightweight water-resistant and measures delta p directly in mmhg features include an auxiliary output for data recording instruments large 3-digit display and low-battery indicator meter includes a probe with 5-m cable 9v batteries and waterproof case range -600 to 700 mmhg accuracy 1 mmhg maximum probe working depth 91 31 meters meter and case weigh 5 lbs one-year warranty 300e 2,300 price includes this waterproof case this unit is also available for rent for $150 per week plus shipping call for availability order online aquaticeco.com order by phone 877-347-4788 tech support 407-598-1401 91

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