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1. Does PROBEST pH meter support two kinds of calibration buffer?

A: Yes, two optional buffer groups:4.0/6.86/9.18 &4.0/7.0/10.01, big advantage for multi-industry test.

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A Q9: If the mV reading on a PROBEST pH water quality analyzer falls far outside the standard range during calibration, what are the possible causes?

Answer:
Check items: aged or damaged pH electrode, expired buffer solution, uncleaned electrode with residual buffer, drastic ambient temperature fluctuation.

A Q8: When using the PROBEST pH electrode on a daily basis, is it okay to switch frequently between the two calibration modes?
Answer：Users can switch two calibration modes anytime via instrument menu according to daily test samples.

A Q7: What practical benefits does PROBEST’s dual-standard calibration design offer users?

Answer:
High versatility: Compatible with two mainstream commercial pH buffers on the market, more flexible for buffer purchasing and cost saving;
Higher testing precision: Match calibration buffer with sample pH property to minimize measuring error;
Multi-industry availability: One PROBEST pH meter meets testing needs of wastewater, food, chemical and pure water industries.

A Q6: During the calibration wait phase, when can I click “Confirm” to save the current calibration with the standard solution?

Answer:
Submerge and stir electrode gently in buffer, wait until mV reading is fully stable, then tap confirm to finish single-point calibration.

A Q5: How should the PROBEST electrode be prepared before each calibration with a new standard buffer solution?

Answer: Rinse electrode fully with clean water and blot residual water with lint-free tissue before next buffer calibration to avoid cross-contamination and inaccurate calibration.

A Q4: When calibrating the 6.86, 4.0, and 9.18 standard solutions, what mV reading is considered within the normal range of PROBEST pH sensor?

Answer:

• pH6.86 buffer: mV reading within ±15 mV is normal;
• pH4.0 buffer: Normal reading around 170 mV±20mV;
• pH9.18 buffer: Normal reading around 120 mV±20mV.

Abnormal mV values mean expired buffer, dirty or damaged pH electrode.

A Q3: What is the sequence of steps for a three-point pH calibration using PROBEST?
Answer:

1. Enter pH calibration menu and select target pH channel;
2. Choose your preferred buffer mode;
3. Rinse electrode with clean water and blot dry with lint-free tissue;
4. Complete calibration in turn: middle buffer → acid buffer → alkaline buffer; rinse & dry electrode before every new buffer;
5. Confirm each point to finish full 3-point calibration. The video uses 6.86→4.0→9.18 as demonstration sequence.

A Q2: What are the appropriate applications for each of the two PROBEST pH calibration buffers?

Answer:

1. Buffer set (4.0,6.86,9.18): National standard general buffer, widely used for wastewater, environmental water and general lab & chemical testing;
2. Buffer set (4.0,7.0,10.01): Centered at neutral pH7.0, ideal for pure water, food & beverage, electroplating solution and neutral-based samples.

Switch modes as needed to improve test accuracy for samples of different pH ranges.

A What is the most distinctive feature of the PROBEST pH meter compared to standard pH meters?

The biggest highlight of PROBEST pH meter is supporting two optional sets of three-point calibration buffer solutions, while most ordinary pH meters only come with one fixed buffer formula. Users can switch between two buffer groups freely: Group1: pH4.0,6.86,9.18; Group2: pH4.0,7.0,10.01 to fit diversified testing scenarios.

A  Q: Beyond drinking water, what other applications are supported?

A: Also suitable for online turbidity monitoring in industrial circulating cooling water, filtered water, and reclaimed water reuse systems.

A Q: What communication protocols does the instrument support?

A: Supports MODBUS RS485 protocol for convenient data transmission and integration.

A Q: What are the main material and protection rating of the PROBEST PLTU-700 instrument?

A: Main body: ABS + SUS316L stainless steel
Seals: Nitrile rubber Protection rating: IP65 (for indoor use)
We PROBEST also have PTU-800 & PTU-600 IP68 turbidity sensor.  

A Q: Is PROBEST PLTU-700 instrument maintenance complicated?

 A: Maintenance is simple and convenient. The product design emphasizes ease of cleaning and requires no complex operations.
And PROBEST also have the PLTU-600 low range turbidity sensor with display or without display for drinking water testing. 

A Q: For which drinking water scenarios is this PROBEST PLTU-700 instrument suitable?

A: It can be used for online turbidity monitoring in filtered water at water treatment plants, finished water, and direct drinking water systems, the range need to be 0-100NTU. 

A Can the PROBEST PLTU-700  low range turbidity sensor? cable length be extended?

A: Standard cable length is 3m. Max could be 30M. But still recomend to 10M. Too long extension is not recommended to avoid signal transmission issues.

A  Q: What is the PROBEST PLTU-700  low range turbidity sensor instrument's operating temperature range?

A: Measurement temperature: 0-45°C (non-freezing conditions); Storage temperature: -15-60°C.

A Q: Are there flow rate requirements during PROBEST PLTU-700 low range turbidity operation?

A: Water flow rate must be between 300-700 mL/min to ensure measurement stability. 

A Q: Is PROBEST PLTU-700 low range turbidity sensor? installation difficult? What are the interface specifications?

A: Plug-and-play design ensures easy installation. Inlet: 1/4 NPT; Outlet: 1/2 NPT.