BENETECH GM765 Pen PH Meter Instruction Manual

BENETECH GM765 Pen PH Meter Instruction Manual

Introduction

This product is accurate, stable, reliable and easy to carry. It can be used to measure the PH value of the solution and the temperature of the liquid to be measured. It is widely used in the fields of industry, electricity, agriculture, medicine, food, scientific research, and environmental protection.

Product feature：

a. Measure the PH value of the solution
b. Measure the solution temperature
c. LCD color screen display
d. Data hold
e. Temperature switch：℃/℉
f. Power cut memory
g. Solution temperature compensation
h. Automatic calibration
i. Electric quantity display
j. Automatic shutdown
k. Red backlight alarm (when PH＜3.5 or PH＞11.5)
l. Automatically detect the measurement state

Components

C.LCD display

Display declaration

is stable and can be used as a standard value.
Power display [ ]| Power display and low power automatic power-off

Operating Instruction

1. Power On/Off
   Short press the ” ” button to turn on the machine, and short press the ” ” button to switch on/off automatic power-off after turning on the machine; Long press “ ” to turn off the machine;

2. Data hold
   After turning on the machine , short press ” ” button to switch on/off the hold data; the PH value will be saved when the machine is turned off, and that value will be displayed when the machine is turned on next time. Manually remove the value and then continue the measurement.

3. Temperature unit switch
   After turning on the machine, long press the ” ” button to switch between ℃/℉。

4. Backlight
   Press any button to open the backlight for 10 seconds.

5. Automatic power-off
   The machine will automatically power off if there is no operation for 10 minutes.

6. Calibration
   After turning on the machine, short press the ” ” button without operation, and long press the “ ” button to enter and exit the calibration.
   It is recommended to follow the automatic calibration process; short press to skip automatic identification and directly carry out calibration.
   Sequential calibration
   SA1: PH=4.0 / 4.00
   SA2: PH=6.8/ 6.86
   SA3: PH=9.1/ 9.18
   Automatic calibration, automatically identify the calibration solution according to the sequence(4.00-6.86-9.18), when the [ ] symbol rotates a single revolution, it indicates that the calibration is completed; If the calibration of the first calibration point is completed, the sensor should be washed with water. And then the next calibration point should be calibrated in turn, and the automatic calibration should be saved. When the power is on, long press” “, and LCD will display [CAL] and [4.00]. After the product sensor is put into the solution with PH=4.00 (the marble needs to be completely immersed), short press” “to display the ADC value. Wait until the ADC value is stable, press” “again to record the value (or wait for automatic calibration of the point). Remove the sensor from the solution, rinse the sensor with water for 1 minute, and then gently wipe it with a paper towel; When the LCD displays 6.86, place the sensor in PH=6.86…Repeat the above steps. After completing the calibration of SA1~SA3, display [End]. Wait for 1 minute, and exit the calibration automatically. In the calibration process, if [Err] occurs, it means that the marble contacts the solution in the wrong order or the sensor is wrong. Recalibration or single point calibration is required.

Technical parameters

Attention

1. In the following cases, the instrument must be recalibrated
2. Electrodes that leave the probe maintenance solution for too long;
3. The probe is replaced by a new one;
4. After measuring solutions containing fluoride and whose pH＜7 or strong organic solutions.
5. If the sensor is damaged, buy a sensor of the same kind. Twist the fastening sleeve of the sensor, and replace the newly purchased sensor.
6. Matters needing attention
7. Before the first operation or calibration, pour an appropriate amount of buffer solution into the protective cap to completely soak the sensor and let the absorbent rod get completely wet (when the rod is dry, soak it for more than 2 hours).
8. Storage method: after use, the sensor shall be washed with clean water, and then soaked in buffer solution for storage, so that it can be used immediately next time;
9. The probe should not be immersed in distilled water or protein solution or acid hydride solution for a long time. Prevent it from contacting with organic silicone grease.
10. After measuring (shall be no more than 10 seconds) concentrated acid (pH<2) or alkali (pH>12), rinse it with distille  water for at least 1 minute and soak it in the buffer solution for 2 hours, otherwise the probe is vulnerable to damage.

Accessory

Particulars Furnished:

a. Old batteries must be disposed of in accordance with local laws and regulations!
b. The company shall not be liable for any derivative results resulting from the use of the products
c. The company reserves the right to update and modify the design specifications and instructions of the product without prior notice.
d. Please do not charge or discharge the lithium battery while
overcharging. Please do not charge it for more than two and a half hours. If the instrument is not used for a long time, please charge it  before placing it.

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