Does tank Salinity change during the day as temperature fluctuates?

BRS

Frogspon

Active Member
Review score
+0 /0 /-0
View Badges
Joined
Jan 13, 2021
Messages
424
Reaction score
348
Review score
+0 /0 /-0
Location
FL
My hanna checker measures the salinity differently depending on the temperature.

When it runs at 79 degrees, it says the Salinity is 1.024, but when the water comes to room temp it reads at 1.028.

When I check the Salinity with a refractometer, it says 1.027.

Is the salinity in the tank really 1.024, or 1.028?
 
A Piece of the Ocean for Every Reef Tank

T-J

Valuable Member
Review score
+0 /0 /-0
View Badges
Joined
Nov 11, 2019
Messages
2,437
Reaction score
2,903
Review score
+0 /0 /-0
Location
Phoenix
What do you mean "when the water comes to room temp"? Your tank temperature shouldn't fluctuate more than a degree throughout the day/night.
The refractometer should be ATC, so you should get the same reading as the Hanna, as long as it's at the same temperature. Assuming both are calibrated correctly (using 35ppm solution, not RODI).
 

Neros503

Active Member
Review score
+0 /0 /-0
View Badges
Joined
Jun 22, 2020
Messages
468
Reaction score
662
Review score
+0 /0 /-0
Location
SF Bay Area
colder water is more dense so that will make the salinity higher, and warmer water is less dense so the salinity will be lower. so yes, salinity can change if the temperature changes, but your temp shouldn't fluctuate that much.
 

Toys For Kids Drive

Untitled-2 copy.jpg

BRS

What prizes are you most excited to possibly win?

  • CADE Aquarium

    Votes: 14 56.0%
  • Turbo's Aquatics GC

    Votes: 4 16.0%
  • Tunze Pumps

    Votes: 6 24.0%
  • SBB Corals GC

    Votes: 7 28.0%
  • AquaticLife Light

    Votes: 4 16.0%
  • Orphek Light

    Votes: 9 36.0%
  • Living Reef Orlando GC

    Votes: 7 28.0%
  • Southwest Aquaculture GC

    Votes: 2 8.0%
  • Top Shelf Aquatics GC

    Votes: 10 40.0%
  • Avast Marine GC

    Votes: 3 12.0%
  • Noopsyche Light and GC

    Votes: 4 16.0%
  • Aquatic Reef Design GC

    Votes: 4 16.0%
  • Tropic Marin Lab Test Kit

    Votes: 3 12.0%
  • Reef Diaper Kits

    Votes: 4 16.0%
Reef Chasers Aquaculture
Top