catalogue search
P. 01
P. 02
P. 03
P. 04
P. 05
P. 06
P. 07
P. 08
P. 09
P. 10
P. 11
P. 12
P. 13
P. 14
P. 15
P. 16
P. 17
P. 18
P. 19
P. 20
P. 21
P. 22
P. 23
P. 24
P. 25
P. 26
P. 27
P. 28
P. 29
P. 30
P. 31
P. 32
P. 33
P. 34
P. 35
P. 36
P. 37
P. 38
P. 39
P. 40
P. 41
P. 42
P. 43
P. 44
P. 45
P. 46
P. 47
P. 48
P. 49
P. 50
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
You may also be interested in
Conductivity meter, Hygrometer, Digital ph meter, DO meter, Test kit
Text version of the page
Q.What’s the difference between single and double junction electrodes? What does that mean to me?A.
HANNA Checker
® 1 or pHep
® , arelow cost, reasonably accurate tools. They are more accurate and convenient than litmus strips or chemical test kits, and are not subject to colorimetric interpretation. They are very handy meters to have around; good for quick checks to make sure that pH is within required parameters. Pocket testers can never as accurately perform all the samefunctions as a hand held instrument. The handheld meter and electrode are much more sophisticated and incorporate manyuseful features not found in a pocket tester. If your major concern is cost and good basic performance, then the pocket tester may be the right fit for your needs. If increased accuracy, durability and additional features are important in your measurements, then a handheld instrument is a better choice in the long run. Q.When should I use a hand-held instrument instead of apocket tester?A. Application and accuracy will be a deciding factor in the type of meter chosen. If you are cultivating a species, or life stage of a species, that is tolerant of pH fluctuations, then you probably do not need the precision of a hand-held instrument. However, if you are raising pH sensitive organisms, such as young fry, reef fish, or invertebrates, you will need to monitor pH as precisely as possible. In this case, a handheld instrument, such as the Q.What about the many available shapes and sizes of pHelectrodes. Does it matter which one I use?A.
HANNA HI 98140, is appropriate.
HANNA HI 991001 or the HI 991003 will work just fine. If you are testing a more aggressive sample with a high ionic concentration,such as sea water, then an instrument with a double junctionelectrode like the HI 9024C will allow better and longer performance.Electrode junctions are available in different materials, each designedfor specific uses. Teflon and ground glass junctions are most suitedfor industrial usage, as they are resistant to strong chemicals. Ceramic junctions are intended for aqueous solutions, while renewable cloth junctions are made primarily for in-line applications Q.How do I know what kind of pH electrode is right for me?A. The measuring tip of a pH electrode is also dependent on the application. A spherical tip of various diameters is considered a general purpose design for a variety of uses. A conical tip is available for use in viscous fluids such as cream or paint. It's also commonly used by the food industry for its piercing ability. The conical tip is also available with a blade attachment for penetration of solids. The flat tip electrode has the unique ability to measure surface pH, and might be used for leather, paper, fruits or skin. All pH electrodes, regardless of shape or size, measure pH in the same way. However, the many available electrodes have been engineered and constructed to better fit a variety of applications. pH electrodes can be made of various materials and carry differenttemperature ratings. The most common construction is glass, but electrodes are also available in PVDF (HI 911B), PEI (HI 1332B), and stainless steel (HI 72911). While glass electrodes are more applicable to a clean laboratory environment, PVDF and PEI electrodes are highly durable polymers that will withstand such rough treatment as is common to in-field use. Stainless steel probes are intended for very high temperature applications, such as metal plating baths and boilers. Application Example: Problem: Pocket testers have been used at a salt water hatchery, butafter about a month the testers need to be calibrated more and moreoften until finally the meter won’t calibrate any longer. Solution: Initially, the issue was the salt water crystallizing on theelectrode junction. This can be countered by using an electrode with arenewable cloth junction such as the HI 1288. The cloth junction can bepulled out by 3 mm to rejuvenate the electrode. As time went by, however, the salt water penetrated the electrode and contaminated theelectrolyte within, due to its high ionic concentration. When this happened, the meter required increasingly frequent calibrations until it could no longer be calibrated and had to be discarded. This situation was avoided by then using a double junction electrode probe, such asthe
HANNA HI 9024. The double junction provides an additional barrierbetween the sample and the electrolyte, significantly prolonging the life of the probe.
pH Application Note
The electrode junction is the bridge between the sample and the electrolyte surrounding the internal pH sensing elements. A single junction has only one barrier between the sample and the electrolyte,and a double junction has two. A double junction has the advantage of slowing possible contamination of the electrolyte due tochemically aggressive samples. The application will be the deciding factor of the kind of junction you need. If you are testing fresh water, or you won’t be testing very often, an instrument with a single junction pH electrode, such as theAquaculture Catalog - 9073 pH Application Note forAquaculture and Aquariums
By Jessica MuschePocket Testers versus Handheld pH Meters
Q.Why should I use a pocket meter?A. Q.Why would I pay for a more expensive handheldinstrument; doesn't a pocket tester do the same for less?A. Pocket tester-style meters, like theHANNA Checker
® 1 or pHep
® , arelow cost, reasonably accurate tools. They are more accurate and convenient than litmus strips or chemical test kits, and are not subject to colorimetric interpretation. They are very handy meters to have around; good for quick checks to make sure that pH is within required parameters. Pocket testers can never as accurately perform all the samefunctions as a hand held instrument. The handheld meter and electrode are much more sophisticated and incorporate manyuseful features not found in a pocket tester. If your major concern is cost and good basic performance, then the pocket tester may be the right fit for your needs. If increased accuracy, durability and additional features are important in your measurements, then a handheld instrument is a better choice in the long run. Q.When should I use a hand-held instrument instead of apocket tester?A. Application and accuracy will be a deciding factor in the type of meter chosen. If you are cultivating a species, or life stage of a species, that is tolerant of pH fluctuations, then you probably do not need the precision of a hand-held instrument. However, if you are raising pH sensitive organisms, such as young fry, reef fish, or invertebrates, you will need to monitor pH as precisely as possible. In this case, a handheld instrument, such as the Q.What about the many available shapes and sizes of pHelectrodes. Does it matter which one I use?A.
HANNA HI 98140, is appropriate.
HANNA HI 991001 or the HI 991003 will work just fine. If you are testing a more aggressive sample with a high ionic concentration,such as sea water, then an instrument with a double junctionelectrode like the HI 9024C will allow better and longer performance.Electrode junctions are available in different materials, each designedfor specific uses. Teflon and ground glass junctions are most suitedfor industrial usage, as they are resistant to strong chemicals. Ceramic junctions are intended for aqueous solutions, while renewable cloth junctions are made primarily for in-line applications Q.How do I know what kind of pH electrode is right for me?A. The measuring tip of a pH electrode is also dependent on the application. A spherical tip of various diameters is considered a general purpose design for a variety of uses. A conical tip is available for use in viscous fluids such as cream or paint. It's also commonly used by the food industry for its piercing ability. The conical tip is also available with a blade attachment for penetration of solids. The flat tip electrode has the unique ability to measure surface pH, and might be used for leather, paper, fruits or skin. All pH electrodes, regardless of shape or size, measure pH in the same way. However, the many available electrodes have been engineered and constructed to better fit a variety of applications. pH electrodes can be made of various materials and carry differenttemperature ratings. The most common construction is glass, but electrodes are also available in PVDF (HI 911B), PEI (HI 1332B), and stainless steel (HI 72911). While glass electrodes are more applicable to a clean laboratory environment, PVDF and PEI electrodes are highly durable polymers that will withstand such rough treatment as is common to in-field use. Stainless steel probes are intended for very high temperature applications, such as metal plating baths and boilers. Application Example: Problem: Pocket testers have been used at a salt water hatchery, butafter about a month the testers need to be calibrated more and moreoften until finally the meter won’t calibrate any longer. Solution: Initially, the issue was the salt water crystallizing on theelectrode junction. This can be countered by using an electrode with arenewable cloth junction such as the HI 1288. The cloth junction can bepulled out by 3 mm to rejuvenate the electrode. As time went by, however, the salt water penetrated the electrode and contaminated theelectrolyte within, due to its high ionic concentration. When this happened, the meter required increasingly frequent calibrations until it could no longer be calibrated and had to be discarded. This situation was avoided by then using a double junction electrode probe, such asthe
HANNA HI 9024. The double junction provides an additional barrierbetween the sample and the electrolyte, significantly prolonging the life of the probe.