1. Introduction
The GVDA PH818 is an intellectual, precise measurement apparatus designed with high-quality components and sensors, ensuring high sensitivity, accuracy, and stable operation across various temperatures. Its compact size makes it easy to store and carry. This device measures both pH values and the temperature of the solvent under test. The PH818 pH meter is widely applied in industrial, electrical, agricultural, medical, and food industries.
Key Features:
- Professional water quality meter
- Automatic temperature compensation
- Working range: 0-14 PH
- HD backlight LCD display
- High accuracy probe
Image: The GVDA PH818 pH meter displaying a pH of 7.49 and temperature of 30.1°C, highlighting its professional water quality measurement capabilities, automatic temperature compensation, 0-14 pH working range, HD backlight LCD, and high accuracy probe.
Applications:
- Water quality testing
- Sewage treatment
- Food acid and alkali testing
- Agricultural applications
- Cosmetics pH measurement
- Water quality testing in farms
Image: Visual representation of various applications for the pH meter, including water quality testing, sewage treatment, food acid/alkali testing, agricultural use, cosmetics pH measurement, and farm water quality testing.
2. Package Contents
Please check the package for the following items:
- Main unit: 1 pc
- PH4.00 calibration powder: 2 bags
- PH6.86 calibration powder: 2 bags
- PH9.18 calibration powder: 2 bags
- Instruction Manual and Warranty Card: 1 set
- Carrying case: 1 pc
Image: Contents of the GVDA PH818 pH meter package, including the pH meter device, a black carrying case, three types of calibration buffer powders (pH 4.01, pH 7.00, pH 10.01), and the instruction manual.
3. Device Overview
3.1. Explanation of Appearance
- Power ON/OFF / and Hold button
- Calibrate / increase button
- Back light / reduce button
- PH value reading area
- Temperature reading area
- PH Probe Electrode
Image: Front view of the GVDA PH818 pH meter, clearly showing the 'SMART SENSOR' branding and model number.
3.2. LCD Display Screen
The LCD screen displays the following information:
- Timer icon
- PH measured value
- Data Hold icon
- Environmental temperature
- Measured value
- Battery power indication
- Calibration mode icon
- Temperature unit °C/°F
4. Setup
4.1. Battery Installation
- Open the battery door located at the top of the instrument.
- Insert two AAA size (1.5V) batteries into this compartment, ensuring correct polarity.
4.2. Initial Preparation
If you have replaced the PH composite electrode with a new one, it is recommended to perform a calibration before using the instrument for measurement.
5. Operation
5.1. Power On/Off
Press the [ON/OFF/HOLD] button once to turn the unit on. To turn it off, press and hold the [ON/OFF/HOLD] button for more than one second.
5.2. Normal Measurement Mode
After turning on the unit, it enters normal measurement mode. Immerse the electrode into the solution you wish to measure. The device will simultaneously display the pH value and the environment temperature.
5.3. Data Hold
During measurement, press the [ON/OFF/HOLD] button once to hold the displayed data. Press it again to release.
5.4. Backlight Control
In normal measurement mode, press the [
] button to turn the backlight on or off.
5.5. Temperature Unit Selection (°C/°F)
- Before turning on the unit, press and hold both [ON/OFF/HOLD] and [] buttons simultaneously.
- The unit will enter temperature unit selection mode, displaying °C or °F.
- Press [ON/OFF/HOLD] to cycle between °C and °F.
- Once your desired unit is selected, press and hold [ON/OFF/HOLD] for more than 3 seconds to save the setting and return to normal measurement mode.
5.6. Auto Power Off Setup
- Before turning on the unit, press and hold both [ON/OFF/HOLD] and [CAL/▲] buttons simultaneously.
- The unit will enter