Analog pH ORP Meter for Continuous Water Quality Monitoring RS485 4-20mA Output
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Product Highlights
- Wide Measuring Range: pH: -2.00 to +16.00, ORP: -2000 to +2000mV with 0.01pH/1mV resolution.
- RS485 Communication: Supports Modbus RTU protocol with selectable baud rates: 9600/19200/38400.
- IP65 Waterproof Design: Durable ABS housing suitable for harsh industrial environments.
- OEM/ODM Support: Manufacturer offers full customization services with 20+ years R&D experience.
- Relay Control Capability: High capacity relay contacts: 5A/250VAC or 5A/30VDC for process control.
- Multi-Installation Options: Flexible mounting for panel, wall, or pipe installation.
Product Attributes
- Customization
- Available
- After-sales Service
- Provided
- Warranty
- Provided
- Model NO.
- PHG-2081Pro
- Measuring Range
- -2.00pH to +16.00 pH;-2000mv to +2000mv
- Resolution
- 0.01pH;1mv
- Temp. Compensation
- PT 1000/Ntc10K
- pH/ORP Current Output1
- Isolated, 4 to 20mA Output, Max. Load 500Ω
- Protocol
- RS485
- Baud Rate
- 9600/19200/38400
- Maximum Relay Contacts Capacity
- 5A/250VAC, 5A/30VDC
- Waterproof Grade
- IP65
- Power Supply
- From 90 to 260 VAC, Power Consumption < 4 Watts, 5
- Material
- ABS
- Installation
- Panel/Wall/Pipe Installation
- Transport Package
- Carton Box
- Specification
- 144mmx144mmx104mm
- Trademark
- BOQU
- Origin
- Shanghai, China
- HS Code
- 90278099
- Production Capacity
- 1500PCS/Month
Shipping
- Shipping Cost:
- Contact the supplier about freight and estimated delivery time.
Online Trading Protection
- Payment Guarantee
-
Platform-protected payments with refund support for eligible order issues.
- Platform Logistics
- Clearer shipment tracking with platform-supported logistics.
- Inspection Service
- Optional pre-shipment inspection for quality and quantity checks.
- After-Sales & Dispute Handling
- Platform-assisted dispute resolution, including refunds or returns when applicable.
Only orders placed and paid through Made-in-China.com Secured Trading are eligible for payment protection and the corresponding platform services.
Product Images of Analog pH ORP Meter for Continuous Water Quality Monitoring RS485 4-20mA Output
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Product Description
PHG-2081Pro Industrial PH&ORP Meter
Built-in A/D conversion module, compatible with a variety of analog signal electrodes. Complete functions, stable performance, easy operation, low power consumption, safety and reliability are the outstanding advantages of this instrument. This instrument is equipped with RS485 transmission interface, which can be connected to the host computer through ModbusRTU protocol to realize monitoring and recording. It can be widely used in industrial occasions such as thermal power generation, chemical industry, metallurgy, environmental protection, pharmaceutical, biochemical, food and tap water

Technical Indexes
| Functions | pH | ORP |
| Measuring range | -2.00pH to +16.00 pH | -2000mV to +2000mV |
| Resolution | 0.01pH | 1mV |
| Accuracy | ±0.01pH | ±1mV |
| Temp. compensation | Pt 1000/NTC10K | |
| Temp. range | -10.0 to +130.0ºC | |
| Temp. compensation range | -10.0 to +130.0ºC | |
| Temp. accuracy | ±0.5ºC | |
| Display | Back light, dot matrix | |
| pH/ORP current output1 | Isolated, 4 to 20mA output , max. load 500Ω | |
| Temp. current output 2 | Isolated, 4 to 20mA output , max. load 500Ω | |
| Current output accuracy | ±0.05 mA | |
| RS485 | Mod bus RTU protocol | |
| Baud rate | 9600/19200/38400 | |
| Maximum relay contacts capacity | 5A/250VAC,5A/30VDC | |
| Language selection | English/ Chinese | |
| Waterproof grade | IP65 | |
| Power supply | From 90 to 260 VAC, power consumption < 4 watts, 50/60Hz | |
| Material | ABS | |
| Installation | panel/wall/pipe installation | |
| Size/Weight | 144mm×144mm×104mm, 0.9Kg | |





1.Who are we?
BOQU instrument focus on R&D and production of Water Quality analyzer&sensor since 2007. Our mission is To be brightest eye for water quality monitoring on earth.
★ Employees: 200+ people
★ Annual growth rate: 35%
★ R&D experiences: 20+ years
★ Technical patents: 50+
★ Annual production quantities: 150,000pcs
★ Cooperation companies: Boehringer Ingelheim, CM, Roche
★ Main Industries: Power plant, Water treatment plant, Drinking water, Pharmaceutical, Fish farming, Swimming pool.
2. How can we guarantee quality?
1) 100% OQC for all of products before shipping
2)Testing pictures and videos to be provided before shipping
3.What's our main business?
Whole solution for water quality instruments. Including analyzers and sensors for pH, COD, BOD,conductivity, Dissolved Oxygen, Turbidity, TSS, Residual chlorine, Ammonia, Nitrate, Hardness and etc..
4. Why choose us instead of other suppliers?
1) Manufacturer was established since 2007, top supplier of water quality instrument.
2)One stop solution provider for water quality monitoring, thousands of projects reference.
3)24 hours after-sales service team, products training on time.
4)20+ years R&D experience, support OEM & ODM service.
5)50+ Patents for water quality analyzer and sensor
5. What service can we provide?
Incoterms: FOB, CFR, CIF, EXW, FAS, CIP, FCA, CPT, DEQ, DDP, DDU,
Express Delivery: DAF, DES;
Payment Currency: USD, EUR, JPY, CAD, AUD, HKD, GBP, CNY,CHF;
Payment method: T/T, MoneyGram, Credit Card, PayPal,Western Union, Cash, Escrow;
Language: English, Chinese, Spanish, Korean
About the Supplier
This supplier has been audited by SGS. Verify the report on the official SGS website with ID "QIP-ASR2142034". Items marked "" are certified.
Company Profile
Shanghai Boqu Instrument Co., Ltd was established in 2007, and located in Kangqiao Town Pudong New Area Shanghai. It is the professional manufacturer of electrochemical instrumentation and electrode combine with the R&D, production and sales. The main products include pH, ORP, conductivity, ion concentration, dissolved oxygen, turbidity, alkali acid concentration and electrode etc.
Our company focus on product quality and after-sales service, adhere to the quality principle of"Aspiring excellence, Creating perfect", obedience to the work style of "Integrity rigorous, Pragmatic and Efficient", to promote "Innovation, Development and Win-Win " spirit of enterprise, with advanced technology and equipment, professional technology as the foundation, high-quality products and perfect after-sales service won the trust of our customers and partners!
We sincerely hope that on the basis of mutual benefit with friends at home and abroad to join hands in creating development and harmonious! Welcome domestic and foreign merchants to come to seek common cause!
About Our Factory & Business Background
-
Business Type
- Manufacturer/Factory
- Address
- No. 118 Xiuyan Road, Pudong District, Shanghai, China
-
Plant Area
- 1368 square meters
-
Number of Employees
- 111
-
Registered Capital
- 10,000,000 RMB
-
Terms of Payment
- LC, T/T, D/P, PayPal, Western Union
-
International Commercial Terms(Incoterms)
- FOB, CIF, CFR
-
Average Lead Time
-
Peak Season Lead Time: within 15 workdays
Off Season Lead Time: within 15 workdays -
Nearest Port
- Shanghai Port
Our Production Capability & Technical Expertise
-
Main Products
- PH, ORP, Conductivity, Dissolved Oxygen, Residual Chlorine, Turbidity, TSS, Ion Ammonia Nitrogen, Nitrate Nitrogen, Blue-Green Algae, Chlorophyll A, COD Analyzer & Sensor (electrode)
-
Production Machines
- Assembly Line
-
ODM Service Available
- Yes
-
OEM Service Available
- Yes
-
R&D Engineers
- 10 people
-
Own Brand
- Yes
Our Industry Experience & Global Business Record
-
Year of Establishment
- 2007-05-23
- Export Year
- 2014-01-06
-
Main Markets
- North America, South America, Europe, Southeast Asia/ Mideast, Africa, East Asia(Japan/ South Korea), Australia, Domestic
-
Number of Foreign Trading Staff
- 12
-
Overseas Agent/Branch
- No
Our Certifications, Standards & Industry Recognition
-
Product Certification
- CE
FAQ
- What is the measuring range for pH and ORP?
- The pH range is -2.00 to +16.00 pH, and the ORP range is -2000mV to +2000mV.
- Does the meter support RS485 communication?
- Yes, it features an RS485 interface compatible with the Modbus RTU protocol for host computer connection.
- Is the device suitable for harsh environments?
- Yes, it has an IP65 waterproof grade and is made of durable ABS material.
- Can the product be customized?
- Yes, the manufacturer supports OEM and ODM services with over 20 years of R&D experience.
- What are the power supply requirements?
- It operates on 90 to 260 VAC with a power consumption of less than 4 watts.
- What is the warranty policy?
- The product comes with a provided warranty and after-sales service support.
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