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ORP/pH temperature tester Hanna

Model 01.015.092.001

Condition New

The exposed stainless steel temperature sensor on these models facilitates faster and more accurate temperature measurement.

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265,98€

-25%

354,64€

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This is a waterproof pH, ORP and temperature meter. The housing of this tester is fully sealed against moisture and is designed to float. The replacement electrode with the stainless steel round connector means there are no pins to bend or break when replacing. This is a lightweight, ergonomically designed tester. This tester is designed to float making it ideal for taking measurements almost anywhere. By definition, pH is the measurement of the voltage generated by an electrochemical cell at zero current. The potential generated is proportional to the thermodynamic activity of the ion being measured. pH can be further described as the negative logarithm of the hydrogen ion concentration, pH = -log10 [H+]. This is based on the fact that pure water, H2O, has an equal amount of hydrogen ions (H+) and hydroxide ions (OH-). In pure water, there is an equal amount of positive and negative ions, making the solution neutral. As the pH changes, there is a 10-fold change in H+ concentration per pH unit. Similar to how acidic or alkaline solutions are quantified by pH measurements, solutions can also be classified as oxidizing or reducing based on ORP measurements (sometimes called "redox"). When an oxidizing and/or reducing agent is dissolved in an aqueous solution, these can react with materials present and produce a voltage, or electromotive force (EMF), that is related to the ratio of oxidized to reduced species in the sample. An exchange of electrons can develop between this solution and an inert metal sensor immersed in the solution, and the voltage can be measured (compared to a reference electrode) with a pH/mV meter. This type of measurement is known as redox or ORP. The units of measurement are in mV. At first glance, an ORP electrode may look very similar to a pH electrode. Like a combination pH electrode, both the sensor and the reference are housed in a common body. The scale of the measurement can be positive (indicating oxidation potential) or negative (indicating reduction). It should be noted that when zero mV is observed, it is actually an oxidation state because the reference voltage (~200 mV for an Ag/AgCl with KCl electrolyte) is included in the observed mV value. In some cases the user may wish to offset the reading to remove the reference contribution. The mV is then said to approximate the absolute mV scale referred to the SHE (standard hydrogen electrode). This type of calibration is called relative mV calibration. An ORP sensor must be chemically inert. It cannot be oxidized or reduced. It must also have the appropriate surface characteristics to promote rapid electron exchange, a property known as high exchange current density. Two noble metals have been shown to work well for this purpose: pure platinum and pure gold are both used in the construction of ORP sensors. The platinum sensor is often preferred because it is mechanically simpler and safer to manufacture. Platinum can be welded to glass and has the same thermal coefficient. Gold sensors cannot be welded to glass and are often mounted on plastic supports that are applied to the glass or plastic tube via tiny elastomeric fins. The gold or platinum sensor signal is carried through the electrode body and, together with the reference signal, is routed to the measurement meter via a coaxial cable with a BNC connector.
Features:
Waterproof
Automatic temperature compensation
HOLD function
Easy to use
Economical
Specifications
pH range -2.00 to 16.00 pH
pH resolution 0.01 pH
pH accuracy 0.05 pH
ORP range 1000 mV
ORP resolution 1 mV
ORP accuracy 2 mV
Temperature range -5.0 to 60.0C / 23.0 to 140.0F
Temperature resolution 0.1C / 0.1F
Temperature accuracy 0.5C / 1F
Automatic pH calibration, one or two points with two sets of standard buffers (pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18)
Automatic temperature compensation for pH measurements
Battery type / Lifespan 1.5V (4) / approx. 250 hours of continuous use. automatic shutdown after 8 minutes of non-use
Environment -5 to 50C (23 to 122F); RH max 100%
Weight 100 g (3.5 oz.)