1. Introduction
This manual provides comprehensive instructions for the operation and maintenance of the Apera Instruments SX811-SS Portable pH Meter. This instrument is designed for accurate pH measurement in food and dairy products, featuring a durable Swiss LanSen food-grade stainless steel spear probe for anti-contamination and reliable performance.
2. Product Overview
2.1 Key Features
- Equipped with a SWISS LabSen Spear Electrode, specifically designed for professional pH measurement in food and semi-solid samples. This probe is resistant to contamination and requires minimal maintenance.
- Offers high accuracy of ±0.01 pH within a range of -2.00 to 19.99 pH. Features Automatic Temperature Compensation (ATC) and Auto Calibration.
- Advanced digital processing technology ensures quick response and stable readings, supporting stable reading and auto-hold display modes.
- Intelligent functions include self-diagnosis for out-of-range values and electrode invalidation, calibration reminders, calibration date checking, and easy parameter setting.
- GLP standard data management with 500 data sets of storage, supporting manual and auto-timing storage. Features USB charging and data output, with data protection during power outages.
- Reliable structure design with a white backlit large LCD display, a foldable stand for benchtop use, a soft silicone case for comfortable grip, and IP57 waterproof rating. Can be powered by battery or USB.
2.2 Components
The Apera Instruments SX811-SS pH Meter kit typically includes the following components:
- SX811-SS pH Meter Unit
- LabSen 811 Spear pH Electrode (Stainless Steel)
- Calibration Buffer Solutions (pH 4.00, 7.00, 10.01)
- Storage Solution
- USB Cable
- 4 AA Batteries
- Instruction Manual
- Portable Carrying Case
Figure 2.2.1: Complete Apera Instruments SX811-SS pH Meter kit, including the meter, spear probe, calibration solutions, and USB cable, neatly organized within its protective carrying case.
Figure 2.2.2: The Apera Instruments SX811-SS pH Meter unit with the spear probe. The meter features a large LCD display and intuitive button layout.
3. Setup
3.1 Battery Installation
- Locate the battery compartment on the back of the meter.
- Open the compartment cover.
- Insert four AA batteries, ensuring correct polarity.
- Close the battery compartment cover securely.
3.2 Probe Connection
- Carefully remove the protective cap from the LabSen 811 spear pH electrode.
- Connect the BNC connector of the electrode cable to the BNC port on the top of the meter. Twist gently to secure.
- Connect the temperature sensor plug (if separate) to its designated port on the meter.
- Ensure all connections are firm to prevent signal interference.
Figure 3.2.1: The LabSen 811 spear pH electrode with its cable and BNC connector, illustrating the connection point for the meter.
4. Operating Instructions
4.1 Power On/Off
- Press the Power button (located on the left side of the meter's control panel) to turn the meter on.
- Press and hold the Power button for approximately 3 seconds to turn the meter off.
4.2 Calibration
Regular calibration is essential for accurate pH measurements. It is recommended to calibrate the meter before each use or at least daily.
- Prepare fresh pH 4.00, pH 7.00, and pH 10.01 buffer solutions.
- Rinse the electrode thoroughly with distilled water and blot dry with a lint-free tissue.
- Immerse the electrode into the pH 7.00 buffer solution. Ensure the spear tip is fully submerged.
- Press the CAL button. The meter will automatically recognize the buffer and begin calibration. Wait for the stable icon to appear.
- Once the first point is calibrated, rinse the electrode and immerse it into the pH 4.00 buffer solution. Press CAL again.
- Repeat the process for pH 10.01 buffer solution if a three-point calibration is desired.
- After successful calibration, the meter will display the calibration results and return to measurement mode.
4.3 pH Measurement
- Ensure the meter is calibrated.
- Rinse the electrode with distilled water and blot dry.
- Insert the spear electrode directly into the sample (e.g., food, dairy product). Ensure the spear tip is fully immersed and in good contact with the sample.
- Gently stir the sample to ensure homogeneity and allow the reading to stabilize.
- Once the stable icon appears on the display, record the pH and temperature readings.
- After measurement, rinse the electrode thoroughly with distilled water and store it properly.
Figure 4.3.1: Close-up view of the LabSen 811 spear pH electrode tip, highlighting its design for direct insertion into food and semi-solid samples.
5. Maintenance
5.1 Electrode Cleaning
- After each measurement, rinse the electrode thoroughly with distilled or deionized water.
- If the electrode becomes contaminated with oil, grease, or protein residues (common in food samples), clean it with a mild detergent solution or a specialized electrode cleaning solution.
- Rinse again with distilled water after cleaning.
5.2 Electrode Storage
- Always store the electrode with its protective cap filled with electrode storage solution (or pH 4.00 buffer solution if storage solution is unavailable). Never store the electrode dry or in distilled water.
- Ensure the storage solution level covers the spear tip.
- For long-term storage, ensure the electrode is clean and the storage solution is fresh.
5.3 Meter Care
- Keep the meter clean and dry. Wipe the exterior with a damp cloth if necessary.
- Avoid exposing the meter to extreme temperatures, direct sunlight, or corrosive environments.
- Ensure the battery compartment is sealed to maintain the IP57 waterproof rating.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Meter does not power on | Dead batteries; Incorrect battery installation | Replace batteries; Check battery polarity |
| Unstable readings | Dirty electrode; Air bubbles around electrode; Electrode not fully immersed; Expired buffer solutions; Damaged electrode | Clean electrode; Gently tap electrode to remove bubbles; Ensure full immersion; Use fresh buffer solutions; Replace electrode |
| Calibration failure | Contaminated buffer solutions; Dirty electrode; Incorrect calibration procedure; Damaged electrode | Use fresh buffer solutions; Clean electrode; Follow calibration steps carefully; Replace electrode |
| Slow response time | Dry electrode; Clogged junction; Old electrode | Rehydrate electrode in storage solution; Clean electrode junction; Replace electrode |
| Error messages on display | Out-of-range measurement; Electrode invalidation | Check sample pH range; Perform electrode self-diagnosis; Consult full manual for specific error codes |
7. Specifications
| Parameter | Value |
|---|---|
| pH Range | -2.00 to 19.99 pH |
| pH Accuracy | ±0.01 pH |
| Temperature Range | 0 to 100 °C (32 to 212 °F) |
| Temperature Accuracy | ±0.5 °C |
| Temperature Compensation | Automatic (ATC) |
| Calibration Points | 1 to 3 points (pH 4.00, 7.00, 10.01) |
| Data Storage | 500 data sets |
| Connectivity | USB |
| Power Supply | 4 AA batteries (included) or USB |
| Waterproof Rating | IP57 |
| Product Dimensions | 36 x 27 x 7.6 cm |
| Product Weight | 382.72 g |
| Electrode Type | LabSen 811 Spear pH Electrode (Stainless Steel) |
| Special Feature | Waterproof |
| Display Type | LCD |
| Outer Material | Stainless Steel |
8. Warranty and Support
Apera Instruments products are designed for reliability and performance. For specific warranty information, please refer to the warranty card included with your product or visit the official Apera Instruments website. For technical support, troubleshooting assistance, or to inquire about replacement parts, please contact Apera Instruments customer service.
Note: Always use genuine Apera Instruments replacement parts and accessories to ensure optimal performance and maintain warranty validity.
