Red Sea Sea Water Refractometer
AA3415
Description
Red Sea’s Seawater Refractometer offers exceptional accuracy, for measuring the absolute salinity of seawater at a temperature of 25°C / 77°F.
Most refractometers used within the aquarium hobby are not specifically designed for reef aquariums and use an algorithm for the measurement of brine (NaCl – rather than seawater) at a temperature of 15°C / 59°F rather than 25°C / 77°F. Thus, a measurement deviation of up to 1.5ppt is possible, which can have a significant adverse effect on coral growth and coloration.
Manual
Red Sea’s Seawater Refractometer Introduction video
Main features of Red Sea’s Seawater Refractometer include:
Directly reads the absolute salinity of seawater at 25°C / 77°F ( No need for seawater or temperature compensation factors)
Specifically designed for the ionic content of seawater (NSW) for more accurate salinity measurement (industry standard refractometers are calibrated for salt brine ).
Calibrated for seawater (NSW) at 25°C / 77°F, the normal temperature range for reef aquariums
(most standard refractometers are calibrated at of 15°C / 59°F ).
Easier to read, higher resolution display, focussed to the relevant range for reef aquariums of up to 40ppt
Includes Integrated Automatic Temperature Compensation (ATC) for accurate measurement at standard ambient temperature.
Red Sea’s Refractometer display
The PPT scale on Red Sea’s Seawater refractometer is calculated using an algorithm for seawater and therefore will give a reading of the Absolute Salinity of seawater.
The PPT scale on regular salinity refractometers are calculated using an algorithm for Brine. Using a Brine refractometer for Seawater will give an error of approximately 1.5ppt in the salinity reading.
Red Sea’s Seawater refractometer red sea seawater refractometer. salinity test for saltwater aquariums
refractometer
Red Sea’s Seawater Refractometer display
Typical Salinity Refractometer display
About Salinity
Salinity is a general term describing the concentration of salt in water. However, solutions of different type of salts have different refractive indexes.
Brine is a solution of Sodium Chloride (table salt) that contains 2 chemical elements.
Seawater contains approximately 70 chemical elements that include Calcium, Magnesium, Potassium etc. in addition to the Sodium Chloride.
Seawater and Brine of the same salinity (i.e. the same weight of salt/liter) have different refractive indexes and will give different salinity readings if measured on the same refractometer.
Refraction & refractive index
All transparent materials such as liquids refract (distort) light.
All transparent materials refract light differently and have what is called a “refractive index” which means how much a particular material distorts light.
Different concentrations of the same liquid have different refractive indexes.
The scale of a refractometer is calculated by using a mathematical algorithm that relates the measured refraction to its concentration for a specific liquid.
Refraction
Refractive index and temperature
The refractive index of liquids change with temperature and therefore has a major effect on measuring salinity with a refractometer.
The algorithm for defining the PPT (and S.G.) scale for a refractometer is calculated for a specific temperature.
PPT readings from refractometers that are not calibrated for reef aquariums (i.e. 25oC) need to be adjusted according to a conversion table to give the actual PPT at the aquarium temperature. This is often a cause for misinterpretation of refractometer readings.
For example, using a seawater refractometer calibrated at 20oC will give a PPT reading that is approximately 1-1.5ppt lower than the absolute salinity of the same water sample at the normal aquarium temperature of 25oC.
Therefore, Red Sea’s Seawater Refractometer calibrated at 25°C/77 0F directly reads the absolute salinity of seawater with no need for temperature compensation factor)
ATC – Automatic temperature compensation
Temperature is probably the biggest cause of wrong readings with a refractometer. Calibration and testing of water samples should be done after the refractometer and water sample have equalized at the correct temperature.
Automatic temperature compensation (ATC) compensates for a few degrees of difference between the ambient temperature and the calibrated temperature of the refractometer. Larger temperature variations will give an error of approximately 1.0ppt in the salinity reading.
ATC does not adjust the PPT reading of a refractometer to the temperature of the aquarium!
Delivery
DELIVERY & GUARANTEES
Complimentary Delivery for Orders Exceeding $150
Indeed, we offer complimentary delivery for purchases exceeding $150. However, it is important to note that this does not apply to heavy or large bulky items, or any livestock. For products that are not deemed bulky or heavy, you will see a notice stating "This item qualifies for FREE SHIPPING." Remember, even if an individual item is eligible for free shipping, your total order must exceed $150 to benefit from this offer. The choice of courier service for complimentary shipping is at the discretion of The Nick's Aquarium.
To minimize prices, we offer fixed $12.50 shipping costs for dry goods under $150 only around Australia.
large items, or orders over 10kg (e.g., dry rock, dry food, large reef salts, and tanks) will be quoted and emailed to you
Dispatch times are generally 24-48 hours after an order is processed and packed (special order items may take up to 7 days to be dispatched from the store or warehouse). The freight company cannot deliver to Australia Post-owned buildings - post offices, PO boxes, locked bags, parcel lockers, or parcel collect locations.
Livestock sent with road freight are only shipped on Mondays, Tuesdays, and Wednesdays to ensure they are delivered before the weekend. Air freight orders are sent on Thursday nights only for pick-up on Friday mornings unless other arrangements have been made. (Note: Livestock cannot be sent with Australia Post.)
If you are not sure about livestock shipping, please contact us with any questions, please note some states may require quarantine approval/inspection. We are not responsible for any delays or fees and charges that may apply.
Please contact us with any questions if you are unsure as to the best shipping method for you.
sales@nicksaquariumoceanariumterrarium.com.au
Returns
All refund rights under both State and Commonwealth law apply. Our goods come with guarantees Australian Consumer Law. You are entitled to a replacement or refund for a major failure. We are not required to provide a refund or replacement if you Change your mind. But you can choose a refund or exchange if an item has a Major problem. This is when the item:
- has a problem that would have stopped someone from buying the item if they had known about it
- is unsafe
- is significantly different from the sample or description
- doesn’t do what we said it would, or what you asked for and can’t be easily fixed.
Alternatively, you can choose to keep the item and we will Compensate you for any drop in value. If the problem is not major, we will repair the item within a reasonable time. If it is not repaired in a reasonable time You can choose a refund or replacement.
CHANGED YOUR MIND ON ITEM If you change your mind about the products you have purchased from us with 7days of date of purchase (it happens, we are all human), we exchange those products for a Gift card/ Gift Voucher Which they were acquired subject to the following conditions: Item(s) must be returned within 7 days of purchase, together with proof of purchase The item is in resalable condition including It is in its original packet, including instruction manuals and all accessories; It is unworn, unopened, unused and in its original condition; Gift cards, personalised products, sale, clearance and seconds items are not eligible for a refund or exchange if you change your mind. You are responsible for any costs associated with returning the item to us in Store
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