The Jenco pH6175 VisionPlus is a microcomputer-based benchtop meter designed for precise measurements of pH, ORP (Oxidation-Reduction Potential), and temperature. This instrument is engineered for laboratory applications, offering a user-friendly experience with advanced features to ensure accurate and repeatable results.
Function Description
The pH6175 is a versatile precision tool that integrates a built-in microprocessor to manage and compensate for all parameters relevant to pH determinations. This includes pH electrode temperature characteristics, electrode slope deviations, and buffer solutions. It can perform pH, ORP, and temperature measurements, making it suitable for a wide range of analytical tasks.
A key feature of the pH6175 is its AUTOLOCK function, available for both pH and mV measurements. This intelligent feature automatically detects the stable endpoint of a measurement and "LOCKS" the display, indicating the final value. This automation, combined with user prompts, significantly reduces common errors in determining pH and mV values, leading to more precise, repeatable, and error-free measurements. For situations where samples are inherently unstable or the AUTOLOCK feature is not desired, the meter can also be operated in a non-AUTOLOCK mode.
The meter supports various calibration options, including single, dual, or three-point calibration for pH. It incorporates electrode offset recognition and electrode slope recognition, which are crucial for maintaining measurement accuracy over time. The device also displays electrode efficiency, allowing users to monitor the condition of their pH electrode and determine when a replacement is needed (recommended if efficiency falls below 75%).
Temperature compensation is another critical function, available in both automatic (ATC) and manual modes. When an ATC/Temp probe is connected, the meter automatically adjusts for temperature effects on pH readings. In manual mode, users can input temperature values directly. The meter also features built-in buffer coefficients to ensure accurate calibration across different buffer sets.
For ORP measurements, the pH6175 requires an optional combination ORP electrode. Similar to pH measurements, ORP readings can be taken in both AUTOLOCK and non-AUTOLOCK modes, providing flexibility depending on the sample stability.
Usage Features
The pH6175 is designed for ease of use in a laboratory setting. Its front panel features a large LCD that simultaneously displays pH or mV readings along with temperature. User prompts and mode indicators guide the operator through calibration and measurement procedures, simplifying complex tasks.
The meter is powered by either six AAA-size alkaline batteries or a UL-approved AC adapter (DC9V output). A "BAT" message is displayed when the batteries require replacement. A convenient feature is that re-calibration is not necessary when power is restored after a power interruption or battery change, preserving previous calibration data.
The mechanical keys on the meter are highly reliable, offering tactile and audio feedback for confident operation. The "On/Off" key powers the unit on or off with a 5-second press and also controls the backlight. The "Mode" key allows users to cycle through different display modes, including pH-AUTO, mV-AUTO, pH, and mV, without affecting calibration values.
Calibration is a guided process. To clear previous calibration values and initiate a new calibration, the "Clear" key is pressed and held for 2 seconds. This ensures a fresh start for accurate calibration. The meter supports two buffer sets (7.00, 4.01, 10.01 pH and 6.86, 4.00, 9.18 pH), with the factory default set to 7.00, 4.01, 10.01 pH. Users can switch between these buffer sets by holding the "Stand" key while turning on the unit.
During pH calibration, the "Stand" and "Slope" keys are used to confirm calibration points. The "WAIT" icon flashes until a stable reading is detected, after which the unit calibrates the point. User prompts indicate which buffer to use next. For manual temperature compensation during calibration, the "Up/Down" keys allow the user to input the buffer temperature.
For measurements, the "Mea./Eff." key is used to initiate the AUTOLOCK process in pH or mV modes. When the "WAIT" icon disappears, the reading is "LOCKED" on the display. Holding this key for 5 seconds also allows the user to view the electrode efficiency.
The meter's waterproof IP54 case provides durability and protection against splashes, making it suitable for various lab environments. It also features 50/60Hz AC noise rejection, ensuring stable readings even in electrically noisy environments.
Maintenance Features
The pH6175 incorporates several features to aid in maintenance and troubleshooting. The electrode efficiency display, accessible by holding the "Mea./Eff." key, provides a direct indication of the pH electrode's performance. This helps users proactively replace electrodes when their efficiency drops below 75%, preventing inaccurate measurements.
The meter includes an internal memory that stores calibration values, eliminating the need for frequent re-calibration. The "Clear" key, when pressed and held for 2 seconds, allows users to erase all stored calibration values, which is useful for troubleshooting or starting a new calibration cycle.
Error displays and troubleshooting guidelines are provided to help users identify and resolve common issues. For instance, "Er1" indicates problems with electrode stabilization or offset, "Er2" points to buffer issues or slope errors, and "Er3" signals temperature range problems. The manual offers corrective actions for each error, such as replacing buffers or electrodes, allowing sufficient stabilization time, or bringing the sample temperature into range.
The device's design, including its robust mechanical keys and waterproof casing, contributes to its overall longevity and reduces the need for frequent repairs. The ability to operate on both AC power and batteries provides flexibility and ensures continuous operation, even during power outages.
In summary, the Jenco pH6175 VisionPlus is a comprehensive and reliable benchtop meter designed to simplify pH, ORP, and temperature measurements through its intelligent AUTOLOCK feature, clear user interface, and robust construction, while also offering practical maintenance indicators and troubleshooting support.
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