V 4.6 Gen 2 Revised 9/21 Lab Grade pH Probe Double junction silver / silver chloride with EXR Glass Reads pH Range 0 − 14 Resolution +/- 0.001 Accuracy +/– 0.002 Response time 95% in 1s Temperature range °C -5 − 99 °C 100 PSI Max pressure Max depth 70m (230 ft) Connector Male SMA / Male BNC Cable length Internal temperature sensor Time before recalibration Life expectancy (Optional) 1 meter No ~1 Year ~2.
Measurements Cable Length 1m (3.2’) 26mm (1”) Ø 2.8mm 35mm (1.3”) 150.6mm (6”) Ø 8mm 115mm (4.5”) 29mm (1.1”) Optional 10ml 50.5mm (1.9”) Soaker bottle ~3.8 pH 12mm (0.
Specifications Reference electrode Double junction Max depth Cable length Weight Speed of response Isopotential point Dimensions SMA connector Sterilization Food Safe Silver / silver chloride Yes 70m (230 ft) 1 meter 49 grams 95% in 1 second pH 7.00 (0 mV) 12mm x 150.6mm (0.5" x 6") Male Chemical only Yes Materials EPDM Nylon Ultem 1000 PVC Polyethylene Titanium Nitride This pH probe can be fully submerged in fresh or salt water, up to the SMA connector indefinitely.
NSF/ANSI 51 Compliant Atlas Scientific LLC, hereby certifies that, Lab Grade pH Probe Part # ENV-40-pH PVC Complies with NSF/ANSI Standard 51 EPDM Polyethylene Nylon Titanium Nitride PVC NSF-51 Compliant Glass NSF-51 Compliant Nylon Ultem 1000 NSF-51 Compliant EPDM NSF-51 Compliant Ultem 1000 NSF-51 Compliant Polyethylene NSF-51 Compliant Titanium Nitride NSF-51 Compliant 4 Copyright © Atlas Scientific LLC Glass
EXR advanced sensing glass Our newest lab grade pH probes have EXR advanced sensing glass; located at the very tip of the glass bulb. The EXR advanced sensing glass has been specially formulated; allowing for faster reactions and more accurate readings in low ionic solutions.
Operating principle A pH (potential of Hydrogen) probe measures the hydrogen ion activity in a liquid. At the tip of a pH probe is a glass membrane. This glass membrane permits hydrogen ions from the liquid being measured to defuse into the outer layer of the glass, while larger ions remain in the solution. The difference in the concentration of hydrogen ions (outside the probe vs. inside the probe) creates a VERY small current.
A pH electrode is a passive device that detects a current generated from hydrogen ion activity. This current (which can be positive or negative) is very weak and cannot be detected with a multimeter, or an analog to digital converter. This weak electrical signal can easily be disrupted and care should be taken to only use proper connectors and cables.
NEVER EXTEND THE CABLE WITH CHEAP JUMPER WIRES! A 1 5 10 15 20 A B B C C D D E E F F G G H H I I J J 1 5 15 15 20 DO NOT CUT THE PROBE CABLE WITHOUT REFERRING TO THIS DOCUMENT! 8 Copyright © Atlas Scientific LLC
DO NOT MAKE YOUR OWN UNSHIELDED CABLES! A 1 5 10 15 20 A B B C C D D E E F F G G H H I I J J 1 5 15 15 20 ONLY USE SHIELDED CABLES.
Extending the probe cable length You can extend the cable to greater than 100 meters with no loss of signal. Atlas Scientific has tested up to 300 meters without a problem, however you run the risk of turning your pH probe into an antennae, picking up noise along the length of your cable. If you want to extend your cable, we recommend that you use proper isolation, such as the Basic EZO TM Inline Voltage Isolator, or Tentacle Shield. Be sure to calibrate your probe with the extended cable.
Helpful operating tips pH probes must stay wet and cannot be allowed to dry out, this is why every pH probe is shipped in a plastic soaker bottle containing pH probe storage solution. The probe should remain in the bottle until it is used. If the probe is used infrequently, the bottle and its solution should be saved and the probe stored inside. 1 To remove the soaker bottle from the probe, hold the soaker bottle by the cap and turn the bottle until it separates from the cap; Then slide the cap off.
3 Vigorously stir the probe in the sample, calibration solution, or rinse solution. This action will bring solution to the probes surface quicker and improve the speed of response. Response time Probe cleaning Coating of the pH bulb can lead to erroneous readings including shortened span (slope). The type of coating will determine the cleaning technique. Soft coatings can be removed by vigorous stirring or by the use of a squirt bottle.
How often do you need to recalibrate a pH probe? Because every use case is different, there is no set schedule for recalibration. If you are using your probe in a fish tank, a hydroponic system or any environment that has generally weak levels of acids and bases you will only need to recalibrate your probe once per year for the first two years. After that every ~six months.
