PH Meter ST400-F

Brand: Ohaus
Model: ST400-F
Origin: USA
Measurement Range: -5 °C – 110 °C; -2.00 – 16.00 pH; -1999 – 1999 mV
Accuracy: ±0.5 °C; ±1 mV; ±0.01 pH
Measurement Resolution: 0.1 °C; 0.01 pH; 1 mV
Display: LCD Backlit Display
Electrode: ST320 IP67 3m (Included)
Accuracy ± (mV): 1 mV
Accuracy ± (Temperature): 0.5 °C
Battery Life: 40 Hours with Rechargeable Battery
Dimensions: 9.05 in x 1.57 in x 3.94 in (230 mm x 40 mm x 100 mm) (LxHxW)
Measurement Range (Temperature): -5 °C ; 110 °C
Measurement Range: -1,999 mV ; 1,999 mV
Net Weight: 0.77 lb (0.35 kg)
pH accuracy (±): 0.01
pH measuring range: -2 ; 16
pH resolution: 0.01
Resolution (Voltage): 1 mV
Temperature compensation: Automatic
Temperature resolution: 0.1 °C
Temperature Sensor: 30 KΩ NTC
Working Environment: 41°F – 104°F, 80%RH, non-condensing (5°C – 40°C, 80% RH, Non-condensing)

SKU: A00A223 Category: Uncategorized Tags: Ohaus PH Meter, PH Meter, PH Meter for Water, PH Meter in BD, PH Meter ST400-F

Description

Introduction to pH Measurement

pH meter is an instrument used to measure acidity or alkalinity of a solution – also know as pH. pH is the unit of measure that describes the degree of acidity or alkalinity. It is measured on a scale of 0 to 14. PH Meter for Water

The quantitative information provided by the pH value expresses the degree of the activity of an acid or base in terms of hydrogen ion activity. The pH value of a substance is directly related to the ratio of the hydrogen ion [H+] and the hydroxyl ion [OH-] concentrations. If the H+ concentration is greater than OH-, the material is acidic; i.e., the pH value is less than 7. If the OH- concentration is greater than H+, the material is basic, with a pH value greater than 7. If equal amounts of H+ and OH- ions are present, the material is neutral, with a pH of 7. Acids and bases have free hydrogen and hydroxyl ions, respectively. The relationship between hydrogen ions and hydroxyl ions in a given solution is constant for a given set of conditions, either one can be determined by knowing the other. PH Meter for Water

pH Measurement

A rough indication of pH can be obtained using pH papers or indicators, which change color as the pH level varies. These indicators have limitations on their accuracy, and can be difficult to interpret correctly in colored or murky samples. PH Meter for Water

WHAT DOES THE TERM “PH” MEAN?

The term pH is derived from “p,” the mathematical symbol for negative logarithm, and “H,” the chemical symbol for Hydrogen. PH Meter for Water
More accurate pH measurements are obtained with a pH meter. A pH measurement system consists of three parts: a pH measuring electrode, a reference electrode, and a high input impedance meter. The pH electrode can be thought of as a battery, with a voltage that varies with the pH of the measured solution. The pH measuring electrode is a hydrogen ion sensitive glass bulb, with a millivolt output that varies with the changes in the relative hydrogen ion concentration inside and outside of the bulb. The reference electrode output does not vary with the activity of the hydrogen ion.

The pH electrode has very high internal resistance, making the voltage change with pH difficult to measure. The input impedance of the pH meter and leakage resistances are therefore important factors. The pH meter in BD is basically a high impedance amplifier that accurately measures the minute electrode voltages and displays the results directly in pH units on either an analog or digital display. In some cases, voltages can also be read for special applications or for use with ion-selective or Oxidation-Reduction Potential (ORP) electrodes.

pH Electrodes

pH electrode technology has not changed much in the past 50 to 60 years. With all the technological advancements of the last 30 to 40 years, pH electrode manufacturing remains an art. The special glass body of the electrode is blown to its configuration by glass blowers. Not a terribly advanced nor “high tech” process but a very critical and important step in the electrode manufacturing. In fact, the thickness of the glass determines its resistance and affects its output.

Temperature Compensation

Temperature compensation is contained within the instrument, because pH electrodes and measurements are temperature sensitive. The temperature compensation may be either manual or automatic. With manual compensation, a separate temperature measurement is required, and the pH meter manual compensation control can be set with the approximate temperature value. With automatic temperature compensation (ATC), the signal from a separate temperature probe is fed into the pH meter, so that it can accurately determine pH value of the sample at that temperature.

Buffer Solutions

Buffers are solutions that have constant pH values and the ability to resist changes in that pH level. They are used to calibrate the pH measurement system (electrode and meter). There can be small differences between the output of one electrode and another, as well as changes in the output of electrodes over time.

Therefore, the system must be periodically calibrated. Buffers are available with a wide range of pH values, and they come in both premixed liquid form or as convenient dry powder capsules. Most pH meters require calibration at several specific pH values. One calibration is usually performed near the isopotential point (the signal produced by an electrode at pH 7 is 0 mV at 25°C), and a second is typically performed at either pH 4 or pH 10. it is best to select a buffer as close as possible to the actual pH value of the sample to be measured.

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Products Delivery Policy:

We ship your product anywhere in Bangladesh. According to the Shipment area, the shipping prices will set. The Shipment price between 50 Taka to 100 Taka. We ship your order by E-courier, shundarban, S.A poribahone, etc. So so so so so so so so. S so so so so so so so. S. So so so so so so so so. S so so so so so so so. S

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If any product is not available in our store but is available in the international markets like Amazon, Ebay, Aliexpress and Alibaba. We will take orders by phone call. For international sourcing products, we must give 100 present advances. After giving your order place you will get your product 20 days later.

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Terms and Conditions

Cash on Delivery

Jadu Bazar is a online shopping store in Bangladesh. We sell meny product on cash on delivery. Cash on delivery is a payment collection method that requires customers to pay for the product upon delivery. That means, If you order a product from Jadu Bazar, you can pay cash for your order when the product you will received from our delivery team. But delivery cost must be paid in advance (Bkash, Nagad, Rocket) then we will send your product.

Due to the current unstable market conditions, to be sure about the stock and price and order online, call: 01919-910640

Delivery Policy

After complete a order and delivery cost paid, Jadu Bazar tries to deliver all the goods to our valuable customer

If your delivery address is within Dhaka city, products will be delivered by within 1 business days. If it is outside Dhaka then it will take 2-3 business days.

Our Business Day: Saturday to Thursday / 09 am – 09 pm. Except public holidays.

Return Policy

Instant return if goods have solid problem.

We provide great customer experience each time you shop with your Jadu Bazar. If you are not satisfied with your purchase, we ensure ‘Replacement Guarantee’. We will replace your purchased product if the product has any defect by its manufacturer or if the product is not the same one you ordered.

All you need to do is give us a call or drop an email at admin@jadubazar.com within a period of 24 Hours from the date of delivery. However, please return the product with the tags intact and in their original packaging, in an unwashed and undamaged condition. Replacement for products is subject to inspection and checking by Jadu Bazar team. Replacement cannot be possible if the product is burnt, damaged by short circuit, or broken by customer.

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