一、产品简介：
7英寸彩色高分辨率(1024*600)电容触摸屏，灵敏度高，参数显示齐全，直观，使用方便、简单。符合国际规范的GLP要求，具有自动校准、自动温度补偿、数据储存、USB输出、时钟显示、无线打印、功能设置和自诊断信息等智能化功能。仪器内置中英文双语操作系统，人性化操作设计，仪器亮度可调内置大容量存储可储存2000套测量数据，数据可以通过U盘存储转移数据，存储数据可用通用办公软件EXELL打开，方便客户编辑。
1. Product introduction:
7-inch color high-resolution (1024*600) capacitive touch screen, high sensitivity, complete parameter display, intuitive, convenient and simple to use. It meets the GLP requirements of international standards, and has intelligent functions such as automatic calibration, automatic temperature compensation, data storage, USB output, clock display, wireless printing, function settings and self-diagnostic information. The instrument has a built-in Chinese and English bilingual operating system, humanized operation design, the instrument's brightness is adjustable, and the built-in large-capacity storage can store 2000 sets of measurement data. The data can be stored and transferred through a U disk. The stored data can be opened by the general office software EXELL, which is convenient for customers to edit.
二、技术指标：
◆测量范围：pH:(0~14. 00)pH105) ℃ mV: (0~±1999)mV T: (-5-105）℃
◆示值误差：pH:±0. 01pH mV: ±0. 1%F. S T: ±0. 5℃
◆分辨率：pH:0. 01pH mV: 1mV T: 0. 1℃
◆输入阻抗：≥1x10Ω
◆稳定性：≤0. 01pH±1个字／2小时
◆溶液温度补偿范围：0-100℃
◆外形尺寸：210x78x40mm
◆重量：0. 2kg
◆消耗功率：7m W
2. Technical indicators:
◆Measuring range: pH: (0~14. 00)pH105) ℃ mV: (0~±1999)mV T: (-5-105)℃
◆Indication error: pH: ±0. 01pH mV: ±0. 1%F. S T: ±0. 5℃
◆Resolution: pH:0. 01pH mV: 1mV T: 0. 1℃
◆Input impedance: ≥1x10Ω
◆Stability: ≤0.01pH±1 word/2 hours
◆Solution temperature compensation range: 0-100℃
◆Dimensions: 210x78x40mm
◆Weight: 0.2kg
◆Power consumption: 7m W
三、工作原理：
水溶液pH值的测量一般用玻璃电极作为指示电极，甘汞电极作为参比电极，当溶液中氢离子浓度（严格说是活度）即溶液的pH值发生变化时，玻璃电极和甘汞电极之间产生的电势也随着发生变化，而电势变化关系符合下列公式：
ΔE=-58. 16xΔpHx (273+t℃) /293 (mV)
ΔE-表示电势的变化，以毫伏为单位。（mV)
ΔpH-表示溶液pH值的变化。
t-表示被测溶液的温度（℃).
常用的指示电极有玻璃电极、锑电极、氟电极，银电极等等，其中玻璃电极
使用广。pH玻璃电极头部是由特殊的敏感薄膜制成，它对氢离子有敏感作用，它插入被测溶液内，其电位随被测液中氢离子的浓度和温度而改变。在溶液温度为25℃时，每变化1个pH,电极电位就改变59. 16mV.这就是常说的电极的理论斜率系数。常用的参比电极为甘汞电极，其电位不随被测液中氢离子浓度而改变。pH值测量的实质就是测量两电极间的电位差。当一对电极在溶液中产生的电位差等于零时，被测溶液的pH值即为零电位pH值，它与玻璃电极内溶液有关。本仪器配用的是由玻璃电极和Ag-Agcl电极组成一体的复合电极，其零点位pH值在7±0. 25pH.
3. Working principle:
The measurement of pH value of aqueous solution generally uses a glass electrode as an indicator electrode, and a calomel electrode as a reference electrode. When the hydrogen ion concentration (strictly speaking, the activity) in the solution, that is, the pH value of the solution, changes, the glass electrode and the calomel electrode The electric potential generated during the time also changes, and the electric potential change relationship conforms to the following formula:
ΔE=-58. 16xΔpHx (273+t℃) /293 (mV)
ΔE- represents the change in electric potential, in millivolts. (MV)
ΔpH- indicates the change in pH value of the solution.
t-represents the temperature of the tested solution (℃).
Commonly used indicator electrodes include glass electrodes, antimony electrodes, fluorine electrodes, silver electrodes, etc., among which glass electrodes
Widely used. The pH glass electrode head is made of a special sensitive film, which is sensitive to hydrogen ions. It is inserted into the test solution, and its potential changes with the concentration and temperature of the hydrogen ions in the test solution. When the solution temperature is 25°C, the electrode potential changes 59.16mV for every change of pH. This is the theoretical slope coefficient of the electrode that is often said. The commonly used reference electrode is calomel electrode, and its potential does not change with the concentration of hydrogen ions in the test solution. The essence of pH measurement is to measure the potential difference between two electrodes. When the potential difference produced by a pair of electrodes in the solution is equal to zero, the pH value of the measured solution is the zero potential pH value, which is related to the solution in the glass electrode. This instrument is equipped with a composite electrode composed of a glass electrode and an Ag-Agcl electrode, and its zero point pH value is 7±0. 25pH.
四、测定样品的注意事项：
◆仪器的电极插头和插口必须保持清洁干燥，不使用时应将短路插头或电极
插头插上，以防止灰尘及湿气浸入而降低仪器的输入阻抗，影响测定准确性。
◆不同的样品，应选择相适应的pH电极（例如：测量强酸、强碱或者纯水等）。
◆在样品测量时，电极的引入导线须保持静止，不要用手触摸。否则将会引
心起测量不稳定。
◆配制标准溶液必须使用二次蒸馏水或去离子水，其电导率应小于2μS/cm,
煮沸使用。
◆要保证标准缓冲液的准确可靠，碱性溶液应装在聚乙烯瓶中密封盖紧。标
准缓冲液应存放在冰箱（低温5~10℃)中保存，一般可保存2-3个月。如发现有
浑浊、发霉、或沉淀等现象时，不能继续使用。
◆勿使用超过保质期的标准缓冲液，勿将使用过的标准缓冲液倒回标准液储
藏瓶中。
◆标定时，尽可能用接近样品pH 值的标准缓冲液进行标定，且样品的温度
尽可能与标定液的温度一致。
◆精密测量时，建议使用ATC温度探头。
◆在仪器使用过程中若更换电极，重新进行标定。
Fourth, the matters needing attention in the determination of samples:
◆The electrode plug and socket of the instrument must be kept clean and dry, and the plug or electrode should be short-circuited when not in use.
Plug in the plug to prevent dust and moisture from entering and reducing the input impedance of the instrument, which affects the accuracy of the measurement.
◆Different samples should choose a suitable pH electrode (for example: measuring strong acid, strong alkali or pure water, etc.).
◆When measuring the sample, the lead-in lead of the electrode must be kept still, and do not touch it with your hands. Otherwise it will lead to
Heart measurement is unstable.
◆Double distilled water or deionized water must be used to prepare standard solution, and its conductivity should be less than 2μS/cm,
It is best to boil and use.
◆To ensure the accuracy and reliability of the standard buffer solution, the alkaline solution should be sealed in a polyethylene bottle and tightly capped. Mark
The quasi-buffer should be stored in the refrigerator (low temperature 5~10℃), generally can be stored for 2-3 months. If found
Do not continue to use it when it becomes turbid, moldy, or precipitates.
◆Do not use the standard buffer solution beyond the shelf life, and do not pour the used standard buffer solution back into the standard solution storage
Hidden in a bottle.
◆When calibrating, use standard buffer as close as possible to the pH value of the sample for calibration, and the temperature of the sample
It should be as consistent as possible with the temperature of the calibration solution.
◆For precise measurement, it is recommended to use ATC temperature probe.
◆If the electrode is replaced during the use of the instrument, re-calibrate.
