ORP Standard 200mV +/-5% @ 25°C 500mL

ORP buffer solutions have a known, stable redox potential. They are used to calibrate ORP electrodes to ensure accurate measurements. By immersing the electrode in the buffer solution, the device can be adjusted or verified to read the correct potential. These solutions provide a stable environment for testing because their redox potential does not vary significantly over time, which is essential for consistent and reliable calibration.

Product Type: Standards

Item Type: Reference Standards

Test Method: Solution

Analyte/Chemical: ORP

Volume: 500 mL

Brand: AquaPhoenix

Here's a step-by-step method for calibrating an ORP sensor using ORP buffer solutions:

Equipment Needed:

- ORP sensor/probe

- ORP meter or controller (which might be integrated with the probe or separate)

- ORP buffer solutions (commonly available in 200mV, 400mV, and 600mV)

- Distilled or deionized water for rinsing

- Clean, dry cloth or paper towels

- Calibration screwdriver (if manual adjustment is required)

Calibration Steps:

Preparation:

- Ensure your ORP sensor and meter are clean. Rinse the sensor with distilled or deionized water to remove any contaminants.

- Pat dry with a clean cloth or paper towel. Do not use any cleaning agents that might affect the electrode.

Initial Setup:

- Turn on the ORP meter or controller. Allow the system to stabilize if it has a warm-up period.

- Ensure that the sensor is properly connected to the meter.

Select Calibration Mode:

- On most modern ORP meters, you'll need to enter calibration mode. This might be a button press or menu selection. Follow the manufacturer's instructions for this step.

First Buffer Solution:

- Use the 200mV buffer solution first, as this is often the standard for lower calibration points.

- Pour enough buffer into a clean container to submerge the electrode tip without allowing it to touch the bottom or sides.

- Place the ORP sensor into the buffer solution. Agitate gently to ensure there are no air bubbles clinging to the electrode.

Wait for Stability:

- Allow the reading to stabilize. This might take a few minutes. The reading should be close to 200mV (±5mV is generally acceptable).

Calibrate to First Point:

- Once stable, adjust the meter to read exactly 200mV if there's a manual adjustment or press a button to accept the value if the meter automatically adjusts.

Rinse and Second Buffer:

- Rinse the electrode with distilled water and dry gently.

- Repeat the process with the 400mV buffer

- Insert the electrode into this new buffer, wait for stabilization, and adjust or accept the reading as before.

Check with Third Buffer (Optional):

- For high precision, you might use a third buffer like 780mV. This step is not always necessary but can confirm the linearity of the sensor across a wider range.

Clean Up:

- Rinse the electrode with distilled water and store it according to manufacturer recommendations, which might involve a storage solution or dry storage.

Record Keeping:

- Note the date and results of the calibration for future reference or maintenance records.

Tips:

- Always calibrate in a controlled environment where temperature is stable, as temperature can affect ORP readings.

- If your ORP sensor has a replaceable reference electrode, ensure it's in good condition or replace if necessary.

- For best results, calibrate before use or at regular intervals as recommended by the manufacturer or based on your specific application's requirements.

This method ensures that your ORP sensor provides accurate measurements by aligning its readings with known standards, thus maintaining reliability in your redox potential assessments.

Data Sheet:

- Safety Data Sheet