Home Seeed Studio Industrial pH Sensor MODBUS-RTU RS485 & 0~2V Analog Voltage (S-pH-01A) V2.0

Seeed Studio Industrial pH Sensor MODBUS-RTU RS485 & 0~2V Analog Voltage (S-pH-01A) V2.0

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SKU: Seeed-101990666
Sale price 169,00 €
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Guarantee & Return Policy

Effective Date: December 10, 2025

At OpenELAB, we are committed to providing accurate product descriptions and high-quality electronics. The following policy outlines your rights and obligations, designed to be fair to both our customers and our business operations globally.

1. Warranty Policy

A. Standard Limited Warranty (Global & US)

For customers in the United States, Asia, and other non-EU regions:

  • Warranty Period: OpenELAB provides a 12-month warranty from the date of delivery.

  • Coverage: This warranty covers defects in material and workmanship under normal use.

  • Resolution: We will repair or replace defective units at no charge.

B. Statutory Rights for EU/UK Customers (EU Compliance)

If you are a consumer residing in the European Union or the UK purchasing from our global site:

  • Statutory Guarantee: You are entitled to a 24-month statutory guarantee for conformity defects present at the time of delivery, in accordance with EU consumer protection laws.

  • Relation: The Standard Limited Warranty (Section 1.A) applies in addition to, and does not replace, your statutory rights.

C. Warranty Exclusions (Applies to ALL Regions)

Warranty coverage is VOID if the damage is caused by:

  1. Misuse: Incorrect installation, reverse polarity, or exceeding voltage limits.

  2. Unauthorized Modification: This explicitly includes soldering, cutting pins, modifying the PCB, or flashing unauthorized/beta firmware that "bricks" the device.

  3. Physical Damage: Drops, moisture/water damage, or electrical surges (lightning).

  4. Normal Wear & Tear: Consumable parts (e.g., batteries), unless defective upon arrival.

Note: For non-warranty repairs (e.g., customer-induced damage), we may offer repair services for a fee. Shipping and diagnostic costs will be borne by the customer.

2. Return & Refund Policy

A. Return Window

  • Standard: You may request a return within 31 days of receiving your order.

B. Refund Conditions & Restocking Fees

To protect against policy abuse, the refund amount is strictly determined by the condition of the returned item.

1. Full Refund (100%)

  • The item is Brand New, Unopened, and Unused.

  • The original packaging is intact and sealed.

  • All accessories are present.

2. Partial Refund (Restocking Fee / Value Depreciation)
If the item is returned in a condition that prevents it from being sold as new, OpenELAB reserves the right to deduct a Restocking Fee (for US/Global) or Compensation for Loss of Value (for EU) from the refund amount.
Deductions apply if:

  • Signs of Use: Visible scratches, mounting marks on screw holes, or fingerprints.

  • Damaged Packaging: Original box is torn, written on, or missing.

  • Technical Modification: The device has been soldered, permanently installed, or flashed with unauthorized firmware.

  • Broken Seals: Anti-static bags or security seals have been opened.

Depending on the severity of the usage/damage, the deduction may range from 15% to 50% of the product price. Items damaged beyond repair due to misuse will not be refunded.

C. Shipping Costs

  • Defective / Wrong Item: OpenELAB covers the return shipping cost.

  • Customer Remorse (Changed Mind / Ordered Wrong Item): The customer is responsible for all return shipping costs to our designated return center (located in the US, Germany, or China, depending on your region). Original shipping fees are non-refundable unless required by local law.

3. Return Process (RMA)

To ensure a smooth return process, please follow these steps:

  1. Authorization: Contact us at info@openelab.io before returning any item. Returns without prior authorization will not be accepted.

  2. RMA Number: We will provide you with a Return Merchandise Authorization (RMA) number and the correct return address.

  3. Packing: Ship the item back in its original packaging with the RMA number clearly marked on the shipping label (not on the product box).

  4. Tracking: We strongly recommend using a trackable shipping method. OpenELAB is not responsible for returns lost in transit.
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Seeed Studio Industrial pH Sensor MODBUS-RTU RS485 & 0~2V Analog Voltage (S-pH-01A) V2.0

Seeed Studio Industrial pH Sensor MODBUS-RTU RS485 & 0~2V Analog Voltage (S-pH-01A) V2.0

169,00 €

The IP68 RS485 pH Sensor provides accurate measurement across the full 0–14 pH range, making it ideal for both soil and water applications, including precision gardening, aquaculture, and swimming pool maintenance. Its rugged, fully waterproof construction ensures dependable performance in harsh outdoor conditions or continuous submersion. When integrated with a SenseCAP Data Logger, the sensor supports seamless, real‑time pH monitoring with efficient remote data collection and management.

 

Features

It measures pH levels in soil and water applications ranging from 0 to 14 pH, making it widely applicable in industrial environmental sensing scenarios.

Note: 

We have two versions of the Industrial pH Sensor. The main difference is the cable connector. Please choose the version that best suits your needs:
  • This version features hook-up wires. It is compatible with the SenseCAP LoRaWAN® Data Logger to connect with the LoRaWAN® network, offering low-power and long-range communication.
  • The other version comes with a waterproof aviation connector. It is compatible with the SenseCAP Sensor Hub 4G Data Logger, which can collect various sensor data simultaneously and transmit via 3G/4G LTE.
  • High Performance: High accuracy, fast response time, and excellent repeatability.
  • Universal Protocol: Supports MODBUS-RTU RS485 and 0~2V Analog Voltage output.
  • Wide-range Power Supply: Compatible with supply voltages ranging from 3.6V to 30V.
  • Extreme Robustness: Suitable for long-term immersion in soil or water; features anti-corrosion properties.
  • Maintenance-Free: A unique junction design effectively prevents junction clogging.   

This pH Sensor with hook-up wires measures hydrogen-ion activity in water-based solutions, indicating acidity or basicity. pH level is a critical indicator for monitoring soil conditions and water quality.

Designed to industry standards, it utilizes an advanced solid dielectric and a large-area PTFE liquid junction to prevent blockage and simplify maintenance. The electrode is IP68 rated and the transmitter is IP65 rated, ensuring a waterproof seal for long-term use in professional environments. With RS485 Modbus and analog output, it integrates easily with data loggers and controllers. This cost-effective sensor features low power consumption and a compact size for high portability.

 

Seeed also provides the SenseCAP Portal and SenseCAP Mate for remote data management.

Note: 

  • White solid crystals around the probe shroud are normal due to temperature changes or redox during delivery. They do not affect the sensor's internal solution or operation.
  • Gently wipe crystals with a wet paper towel and keep away from children to avoid ingestion.

Specifications

pH Parameters
Range 0 ~ 14 pH
Accuracy ± 0.1 pH
Resolution 0.01 pH
General Parameters
Product Model S-pH-01A  
Output Interface Analog Voltage 0-2V RS-485 MODBUS-RTU
Power Supply 3.9-30V/DC 3.9-30V/DC
Power Consumption 35mA@24V DC 35mA@24V DC
Start-up time  < 2 seconds
pH Measurement
High impedance isolated input;
Range: 0 - 14 PH,
Resolution: 0.01 PH,
Accuracy: +/- 0.1 PH;
Suitable for solutions or semi-solid substrates
Temperature Measurement
Range: -40~80°C,
Resolution: 0.1°C,
Accuracy: +/-0.5°C
IP Rating

Electrode: IP68;

Transmitter: IP65
Operating Temperature -40℃ ~ 85℃
Installation

Electrode: 3/4" NPT threads;

Transmitter: Mounting hole
Cable Length
Power/Signal Cable: 2m (Customizable)
Electrode Cable: 5m
Dimension 
Electrode: 160*30mm (3/4"NPT); Transmitter: 140*65*50mm

 


Hardware Overview

Wiring Diagram

pH Sensor Wiring Diagram


Note

Version 1 (RS485 and 4~20mA) is retired. It is replaced by Version 2, which supports RS485 protocol and 0~2V analog voltage output.

   

Probe Dimensions


Applications

  • Smart Agriculture and Irrigation
  • Animal Husbandry Monitoring
  • Forestry and Horticulture
  • Industrial Sewage Treatment
  • Swimming Pools and Spas
  • Scientific and Educational Projects
  • Environmental Water Quality Monitoring

Certification

HSCODE 9031809090
COO CHINA

FAQ

Q: Is it factory calibrated? How do I calibrate it?
A:

Yes, the device is fully calibrated at the factory prior to shipment.

For manual calibration steps, please refer to the Calibration Document.
Q: Why is the temperature output inaccurate?
A: The pH electrode itself does not have a built-in temperature sensor; the output reflects the internal plate temperature. If precise liquid temperature is needed, use an external NTC (10K, 3950) thermistor.
Q: Can it be used in soil? How should it be installed?
A: Yes, it measures soil moisture pH. Error increases in dry soil. Installation: Dig a pit, fill with water to create a slurry, then insert the glass probe carefully, avoiding hard objects like stones.

 

Part List

Industrial pH Sensor (Hook-up wires) x1

1. General Shipping Information

  • We provide reliable shipping services with a tracking number for each order.
  • Shipping addresses must be entered in English and should not contain special symbols, so that the courier system can recognize your location correctly.
  • Please make sure your shipping address is accurate before placing your order. We ship strictly according to the address provided at checkout.
  • In-stock orders are usually dispatched within 1 business day after order confirmation.
  • Estimated delivery times refer to the period after dispatch and do not include order processing time, weekends, public holidays, customs inspection, or force majeure delays.
  • If you need to cancel or modify your order, please contact us before the order is marked as “Shipped”. Once shipped, the order cannot be canceled or changed.

🚀 Need Faster Shipping?

If you require expedited shipping, please contact our customer support team at info@openelab.io for a customized quote based on your destination.

2. Shipping Rates & Options

Shipping rates are calculated based on order value, destination, and available shipping methods. The final available options will be displayed at checkout.

2.1 Germany Domestic Shipping

Shipping Method Order Value Cost Est. Delivery
Deutsche Post €0.00 - €50.00 €4.95 2-4 Business Days
Deutsche Post Over €50.00 Free 2-4 Business Days
DHL Paket
(Faster Delivery)		 €0.00 - €50.00 €6.95 1-3 Business Days
DHL Paket
(Faster Delivery)		 €50.00 - €100.00 €2.00 1-3 Business Days
DHL Paket
(Faster Delivery)		 Over €100.00 Free 1-3 Business Days

2.2 Selected EU Countries / Regions

Available EU shipping destinations are shown at checkout based on your shipping address. For orders shipped to selected EU countries or regions outside Germany, we use FedEx Regional Economy.

Shipping Method Order Value Cost Est. Delivery
FedEx Regional Economy €0.00 - €100.00 €7.95 3-5 Business Days
FedEx Regional Economy Over €100.00 Free 3-5 Business Days

EU orders may be fulfilled from our Munich warehouse or, when applicable, from our Shenzhen warehouse depending on inventory availability. For EU member states, OpenELAB covers applicable import duties and taxes under DDP service where required.

2.3 United States

Region Shipping Method Order Value Cost Est. Delivery
Continental U.S.
(50 States)		 USPS Ground Advantage €0.00 - €45.00 €4.95 3-7 Business Days
USPS Ground Advantage Over €45.00 Free 3-7 Business Days
USPS Priority Mail €0.00 - €45.00 €16.95 1-4 Business Days
USPS Priority Mail Over €45.00 €14.95 1-4 Business Days
Non-Continental U.S.
(AK, HI, PR, etc.)		 USPS Ground Advantage €0.00 - €60.00 €6.95 5-9 Business Days
USPS Ground Advantage Over €60.00 Free 5-9 Business Days

Non-Continental U.S. regions include Alaska, American Samoa, Guam, Hawaii, the Marshall Islands, the Northern Mariana Islands, Palau, Puerto Rico, the U.S. Virgin Islands, and U.S. Armed Forces addresses.

2.4 International Destinations Outside the EU

For selected international destinations outside the EU, including Switzerland, the United Kingdom, and Norway, shipping rates are as follows:

Order Amount Shipping Cost
€0.00 - €300.00 €19.95
Over €300.00 Free

For non-EU destinations, import duties, taxes, and customs fees may be charged by the destination country and are the responsibility of the recipient.

3. Warehouses & Fulfillment

Our products may be stored in our Munich, Arlington, and Shenzhen warehouses. The actual shipping warehouse depends on product availability and destination.

3.1 Munich Warehouse

For products stored in our Munich warehouse, we use Deutsche Post or DHL Paket for domestic deliveries within Germany. For selected EU destinations outside Germany, we use FedEx Regional Economy.

3.2 Arlington Warehouse

For products stored in our Arlington warehouse, we use USPS or UPS for deliveries within the United States.

3.3 Shenzhen Warehouse

For pre-order items or products fulfilled directly from our Shenzhen warehouse, we arrange reliable international shipping based on destination and inventory status. For EU member states, OpenELAB covers applicable import duties and taxes under DDP service where required.

4. Inventory, Pre-orders & Split Shipments

  • Inventory Status: Please check the product page for real-time stock information. If an item is out of stock in our local warehouses, it may be marked as “Pre-order”.
  • Pre-order Fulfillment: Pre-order items may be shipped directly from Shenzhen or restocked to a local warehouse first before final delivery.
  • Split Shipments: If your order contains both in-stock and pre-order items, we may ship them separately. No additional shipping fee will be charged for split shipments caused by our fulfillment arrangement.

5. Customs, Taxes & Delivery Issues

5.1 Customs and Taxes

For EU Member States:
Whether shipped from Germany or China, OpenELAB covers applicable import duties and taxes under DDP service where required. Customers in EU member states should not be charged additional import duties or VAT upon delivery.

Important Notice for Non-EU Countries:
For destinations outside the European Union, such as Switzerland, Norway, and the United Kingdom, import duties, taxes, and customs fees may be charged by local authorities upon delivery. These fees are the responsibility of the recipient.

5.2 Damaged, Delayed, or Lost Parcels

Please inspect your parcel upon delivery where possible. If you notice visible damage, please report it to the courier and contact us as soon as possible. This does not affect your statutory consumer rights.

If your parcel is delayed, lost, returned to sender, or the tracking information has not updated for an unusual period of time, please contact us at info@openelab.io. We will assist you in checking the shipment status with the courier.

5.3 Incorrect Address or Failed Delivery

If a parcel cannot be delivered due to an incorrect or incomplete address provided by the customer, refusal of delivery, or failure to collect the parcel, additional shipping or return costs may apply.

6. VAT

For orders within the EU, VAT is collected at checkout according to the applicable destination rules. No additional VAT should be collected upon delivery for EU member state orders covered under our DDP shipping arrangement.