Go Back   The Reef Tank > Reef Discussion Forums > General Reef Discussion
Register

Old 01-19-2011, 01:57 PM   #1
Tethered_Limbs
Shark
 
Tethered_Limbs's Avatar
 
Join Date: Jun 2010
Location: Merrillville, IN
Posts: 1,759
Reviews: 2

calibrating a refractometer


ive had my refractometer for about 6 months, n figure it needs 2 be calibrated. how do i go about doing this?
__________________
75 Gal/ 55 Sump, Royal-Exclusiv Alpha 170, Radion Gen2, Mag 18, 2x MP 40w 2x Mp 10Wes
Controlled by a Jr. with WXM module.
Maintained with 1% daily w/c
Anemones Have Stinky Feet

Reefkeeping made easy- what was not explained.
Tethered_Limbs is offline   Reply With Quote
Old 01-19-2011, 02:11 PM   #2
drew1092
Leaf on the Wind
 
drew1092's Avatar
 
Join Date: Aug 2009
Location: Cleveland, Ohio
Posts: 736
Reviews: 7
Use a clean (not for salt water use) eye dropper and put 2-3 drops of RO water on your meter as you would for checking the salinity. You should have an adjusting screw driver with your meter. If not you can use a small eye glass screw driver to adjust the screw near the lens. As you look through the scope, adjust the screw until the water line lines up with 0. Very easy, some people will use pinpoint solution which is the same principle. Oh, make sure you clean off the lens with RO water first!
drew1092 is offline   Reply With Quote
Old 01-19-2011, 02:23 PM   #3
Tethered_Limbs
Shark
 
Tethered_Limbs's Avatar
 
Join Date: Jun 2010
Location: Merrillville, IN
Posts: 1,759
Reviews: 2
kk thanks. i have a old poopy plastic hydrometer that reads under .020 n my refractometer reads . 025 so i just wan be sure
__________________
75 Gal/ 55 Sump, Royal-Exclusiv Alpha 170, Radion Gen2, Mag 18, 2x MP 40w 2x Mp 10Wes
Controlled by a Jr. with WXM module.
Maintained with 1% daily w/c
Anemones Have Stinky Feet

Reefkeeping made easy- what was not explained.
Tethered_Limbs is offline   Reply With Quote
Old 08-01-2011, 03:57 PM   #4
neilcab
squid
 
Join Date: Jul 2011
Posts: 3
Another refractometer question. I know most refractometers are calibrated at 20/20 but the average room temp in my location is way higher than that. The refractometer I bought came with a correction chart but I don't understand it all. Does anyone know how to use the chart? My refractometer has ATC and I've read somewhere that I don't need to use the correction chart if it has ATC. I'm trying to get the correct value for 26 degrees. My SG went from 1.025 to 1.024 in one day which I think is weird considering there was some evap overnight and I haven't topped off before I took the reading.

Thanks in advance!
neilcab is offline   Reply With Quote
Old 08-01-2011, 04:11 PM   #5
hotdogg
Shark
 
hotdogg's Avatar
 
Join Date: Nov 2010
Location: Ringwood, NJ
Posts: 1,544
Images: 1
Reviews: 2
There is a test liquid just for refractometers that is exactly 35ppt...much closer to the salinity level of your tank (Pinpoint Precision calibration solution)...my refractometer calls for distilled water
hotdogg is offline   Reply With Quote
Old 08-01-2011, 04:11 PM   #6
chrisd
Shark
 
chrisd's Avatar
 
Join Date: May 2009
Location: Philly
Posts: 6,988
Images: 38
Reviews: 33
if your refractometer has (atc) then you dont need to use the chart but it's best to use a calibration fluid of 1.026 or 35%

http://www.marinedepot.com/American_...source=4169822
chrisd is offline   Reply With Quote
Old 08-01-2011, 04:23 PM   #7
Jadinop
Shark
 
Jadinop's Avatar
 
Join Date: Nov 2006
Location: Orange Park, Fl
Posts: 8,350
Images: 24
As with any test device, you calibrate it in the range that you are testing for. You don't calibrate to zero unless you are testing for zero.

Salinity calibration fluid is the correct method regardless of what the instructions with the refractometer call for. Using only pure water to calibrate your refractometer will cause innaccurate readings.

It's covered in detail in this article.
http://reefkeeping.com/issues/2006-12/rhf/index.php#11
__________________
There is a difference between surviving and thriving.
Jadinop is offline   Reply With Quote
Old 08-01-2011, 04:26 PM   #8
Nate_Bro
Google Monster
 
Nate_Bro's Avatar
 
Join Date: Jun 2010
Location: Outside of Dallas TX
Posts: 25,757
Images: 1011
Reviews: 17
+1 calibrate at 1.026 or 35%

calibrating with RO/DI water can along with a temp change (for those that don't have atc) can lead to a reading off a bit, not much by some other standards, but for those of us that are trying to hit such a small range it can be very bad.
Nate_Bro is offline   Reply With Quote
Old 08-01-2011, 04:37 PM   #9
TrishW
Shark
 
TrishW's Avatar
 
Join Date: Apr 2011
Location: Tennessee River Valley, Alabama
Posts: 1,582
Images: 182
Reviews: 1
Highjack alert....Does anyone have to calibrate the ATC refractometer at 68 degrees F?
TrishW is offline   Reply With Quote
Old 08-01-2011, 04:44 PM   #10
Jadinop
Shark
 
Jadinop's Avatar
 
Join Date: Nov 2006
Location: Orange Park, Fl
Posts: 8,350
Images: 24
Quote:
Originally Posted by TrishW View Post
Highjack alert....Does anyone have to calibrate the ATC refractometer at 68 degrees F?
No, temp is only important if your refractometer is not ATC. Even then, the difference between the calibration temp and testing temp would need to be significant for it to be a problem.

Room temp and a good salinity calibration fluid is all you need to be more than accurate enough for our needs. It's mentioned in the article I posted above in the section called "Tips on calibrating a refractometer".
__________________
There is a difference between surviving and thriving.
Jadinop is offline   Reply With Quote
Old 08-01-2011, 04:51 PM   #11
TrishW
Shark
 
TrishW's Avatar
 
Join Date: Apr 2011
Location: Tennessee River Valley, Alabama
Posts: 1,582
Images: 182
Reviews: 1
Quote:
Originally Posted by Jadinop View Post
No, temp is only important if your refractometer is not ATC. Even then, the difference between the calibration temp and testing temp would need to be significant for it to be a problem.

Room temp and a good salinity calibration fluid is all you need to be more than accurate enough for our needs. It's mentioned in the article I posted above in the section called "Tips on calibrating a refractometer".
Thanks, I am about to read the thread you referenced.
TrishW is offline   Reply With Quote
Reply

Tags
calibration , refractometer


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Calibrating new refractometer...um...help. icebear General Reef Discussion 14 10-15-2008 01:38 AM
Calibrating refractometer DwightKeenan TCMAS 4 02-05-2007 10:08 PM
Calibrating Refracto Allyson General Reef Discussion 4 01-11-2007 02:53 PM
Calibrating Refractometer? Beng TCMAS 7 06-13-2005 11:20 AM
Calibrating my refractometer JoeJoe Atlanta Reef Club 3 02-14-2004 04:32 PM

Similar Issues
Issue Issue Starter Forum Replies Last Post
site:thereeftank.com thereeftank lamarck angelfish ScruffyRubicon General Reef Discussion 8 2007-01-13 13:05:49
site:thereeftank.com thereeftank powerhead for 55 gallon Bender 2 NIMAS(Northern Indiana Marine Aquarium Society) 15 2009-09-18 18:05:05
site:thereeftank.com thereeftank green chromis cobray General Reef Discussion 9 2006-10-30 00:22:24
site:thereeftank.com thereeftank green chromis ylmaya General Reef Discussion 3 2004-08-20 20:59:09

Sitemap:1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225
Sponsor Our Community

All times are GMT -5. The time now is 11:11 AM.


Powered by
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Our lawyer tells us that, by pressing the "New Thread" or "New Reply" button, you acknowledge that the opinions and information expressed in your article are yours alone and not those of thereeftank.com, dba The Reef Tank. Further, you agree to indemnify The Reef Tank, its moderators, administrators and agents from any and all liability which may arise as a result of your article. (C)opyright 2006 TheReefTank.com