Reef Central Online Community

Home Forum Here you can view your subscribed threads, work with private messages and edit your profile and preferences View New Posts View Today's Posts

Find other members Frequently Asked Questions Search Reefkeeping ...an online magazine for marine aquarists Support our sponsors and mention Reef Central

Go Back   Reef Central Online Community > General Interest Forums > Reef Discussion
Register Blogs FAQ Calendar Mark Forums Read

Notices

Reply
Thread Tools
Old 10/13/2017, 04:11 AM   #1
Shankytank
Registered Member
 
Join Date: Sep 2017
Location: Indonesia
Posts: 19
How to calibrate refractometer ?

Does it uses the liquid calibration or the screw ?

Sent from my SM-T705 using Tapatalk


Shankytank is offline   Reply With Quote
Old 10/13/2017, 04:40 AM   #2
mcgyvr
Registered Member
 
mcgyvr's Avatar
 
Join Date: Sep 2003
Location: North Carolina
Posts: 11,914
Both..
You put calibration fluid on it and then turn the screw if needed to adjust to the level of the calibration fluid..


__________________
Being blunt and having fun
mcgyvr is offline   Reply With Quote
Old 10/13/2017, 05:00 AM   #3
Shankytank
Registered Member
 
Join Date: Sep 2017
Location: Indonesia
Posts: 19
Quote:
Originally Posted by mcgyvr View Post
Both..
You put calibration fluid on it and then turn the screw if needed to adjust to the level of the calibration fluid..
So by the mean to calibrate the refractometer can be one of them then can be the fluid or the screw right ?

Sent from my SM-T705 using Tapatalk


Shankytank is offline   Reply With Quote
Old 10/13/2017, 05:08 AM   #4
kmbyrnes
Not-so-newbie
 
kmbyrnes's Avatar
 
Join Date: Aug 2013
Location: Mesa AZ
Posts: 2,005
Longer answer.....
You use the calibration fluid to make an adjustment to the set screw so it reads what your fluid is supposed to be ( 1.025 or what ever ).
DO NOT use RODI water to set your zero point.
These are not nuclear grade instruments and they will be inaccurate at some point along the scale.
You want the tool to be most precise in the area your are attempting to measure.


__________________
125g Mixed Reef 5/26/2015; 350 Butterfly Dominated FOWLR 11/26/2015; 100g Mixed Reef 11/16/2013 to 06/16/2017

Current Tank Info: Too small
kmbyrnes is offline   Reply With Quote
Old 10/13/2017, 05:14 AM   #5
Shankytank
Registered Member
 
Join Date: Sep 2017
Location: Indonesia
Posts: 19
And when will i calibrate the refractometer ?

Sent from my SM-T705 using Tapatalk


Shankytank is offline   Reply With Quote
Old 10/13/2017, 05:56 AM   #6
homer1475
Registered Member
 
homer1475's Avatar
 
Join Date: Mar 2015
Location: Upstate NY
Posts: 3,759
35ppt calibration solution is put on the glass, you then look through the eye piece and turn the screw so the blue line matches up to 35ppt.

I like to calibrate mine on every use, but I notice little to no variation. Some refractometers will loose calibration if just bumped. Some are better built then others.


__________________
80G SCA Build: http://reefcentral.com/forums/showthread.php?t=2560256

Biocube Build Thread: http://www.reefcentral.com/forums/showthread.php?t=2499945

Nothing in this hobby happens fast!
homer1475 is online now   Reply With Quote
Old 10/13/2017, 07:28 AM   #7
Pslreefer
Registered Member
 
Pslreefer's Avatar
 
Join Date: Sep 2017
Posts: 38
I tested mine after 8 years and it was still good.


Pslreefer is offline   Reply With Quote
Old 10/13/2017, 11:38 AM   #8
MondoBongo
Obligate Feeder Obsessed
 
MondoBongo's Avatar
 
Join Date: Oct 2012
Location: Pittsburgh, PA
Posts: 3,680
Quote:
Originally Posted by Shankytank View Post
And when will i calibrate the refractometer ?

Sent from my SM-T705 using Tapatalk
i like to test mine regularly. i have one refractometer that rarely needs touched, and another one that seems to go out of whack when the wind blows.

i try to check them both at least once a month.


__________________
[Citation Needed]

"You don't use science to show that you're right, you use science to become right" - xkcd

Current Tank Info: A rectangular shaped money pit.
MondoBongo is offline   Reply With Quote
Old 10/13/2017, 12:25 PM   #9
lespaul339
Reefer
 
lespaul339's Avatar
 
Join Date: Aug 2012
Location: Iowa
Posts: 909
I check mine and calibrate it every time before use. Only takes a couple seconds to do. Would rather be safe than sorry.


__________________
Reefer Madness!

Current Tank Info: 60x24x24 150 gallon reef, 55 gallon sump.
lespaul339 is offline   Reply With Quote
Old 10/13/2017, 03:32 PM   #10
fcmatt
Registered Member
 
fcmatt's Avatar
 
Join Date: Dec 2006
Location: NH
Posts: 838
Just today I calibrated mine. I bought two different brand calibration fluids. They were off just a tiny tiny bit. I centered it among the two. Just to be clear off by the smallest amount. Even turning the calibration screw a little bit was difficult due to how little they were off from each other. I consider both solutions to be reasonable and accurate enough for the price.


fcmatt is offline   Reply With Quote
Old 10/13/2017, 05:16 PM   #11
outssider
Registered Member
 
Join Date: Nov 2009
Location: Reseda, Ca.
Posts: 1,236
Quote:
Originally Posted by lespaul339 View Post
i check mine and calibrate it every time before use. Only takes a couple seconds to do. Would rather be safe than sorry.
+1


outssider is offline   Reply With Quote
Old 10/13/2017, 08:11 PM   #12
der_wille_zur_macht
Team RC Member
 
der_wille_zur_macht's Avatar
 
Join Date: Sep 2003
Location: NY
Posts: 17,286
Check it every time. I've had units that were fine for months or years, and then one day were off by 20 or 30%. No mishandling, no abuse, no nothing wrong.

Make sure you understand the procedure for use, as well. The common ATC (auto temp correction) units need the sample to sit on the glass for 45 seconds before you take a reading. If your isn't ATC, you need to understand the temp and/or procedure it's designed for.


__________________
Inconveniencing marine life since 1992

"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
der_wille_zur_macht is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -6. The time now is 02:40 AM.


TapaTalk Enabled

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Use of this web site is subject to the terms and conditions described in the user agreement.
Reef CentralTM Reef Central, LLC. Copyright 1999-2014