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Mettler Toledo InPro4800/SG/225/PT1000 Analog pH Electrode | Order No. 52003544

Mettler Toledo InPro4800/SG/225/PT1000 (Order No. 52003544) analog in-line combination pH electrode, HA glass membrane, pH 0-14, -5 to 130°C, 0-12bar, gel electrolyte PTFE annular diaphragm Ag/AgCl double chamber, platinum solution ground SG also measures ORP, PT1000, 225mm, Pg13.5, VP connector, explosion-proof. Order available.

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Product Details

1. Product Overview

The Mettler Toledo InPro4800/SG/225/PT1000 (Order No. 52003544) is a premium analog in-line combination pH electrode from the InPro4800(i) series, with built-in PT1000 temperature sensor and Solution Ground (SG), specifically designed for harsh industrial conditions. It is a classic and widely applied pH electrode in Mettler Toledo's Process Analytics product line.

The electrode features a High Alkali resistant (HA) glass membrane, developed specifically for harsh conditions and highly alkaline media, maintaining excellent response performance and measurement accuracy across the full pH 0-14 range, effectively overcoming the "sodium error/alkaline error" of ordinary glass membranes at high pH values. It also has good mechanical strength and chemical resistance, capable of long-term reliable operation in high-temperature, high-pressure, strongly corrosive industrial environments.

The reference system adopts gel electrolyte + PTFE annular diaphragm + pressure compensated double chamber Ag/AgCl system. Gel electrolyte requires no refilling, maintenance-free, no leakage; PTFE annular diaphragm has low surface energy, anti-fouling anti-clogging, large contact area, especially suitable for media with suspended solids, oils, proteins, sulfides and other fouling substances; pressure compensated double chamber ensures stable reference potential unaffected by process pressure fluctuations; Ag/AgCl reference system provides stable and reliable reference potential.

Solution Ground (SG) has a built-in platinum auxiliary electrode with three functions: ① Eliminates ground loop interference, improving measurement stability; ② Supports advanced sensor diagnostics by monitoring SG-to-reference impedance to diagnose electrode health (diaphragm fouling, electrolyte depletion, glass membrane aging), enabling predictive maintenance; ③ The platinum electrode can also measure ORP/Redox (typical range -1500 to +1500mV), one electrode dual-use.

The electrode has a built-in PT1000 temperature sensor (1000Ω at 0°C), measures process temperature in real-time, works with transmitter for automatic temperature compensation (ATC), ensuring accurate pH measurement across the full -5 to 130°C range. PT1000 has higher signal resolution and anti-interference capability than PT100.

This model is an analog electrode, directly transmits pH millivolt signal and PT1000 temperature signal, compatible with Mettler Toledo M300/M400/M700/M800 transmitters and third-party transmitters supporting analog pH input. The electrode uses a VP cable connector and Pg 13.5 thread process connection, standard interface specifications for industrial process pH electrodes.

The electrode shaft is made of glass, diameter approx. 12mm, this model length 225mm (series optional 120/225/360/425mm). Operating temperature range -5°C to +130°C, operating pressure 0 to 12 barg at 130°C (safety factor 3).

Comprehensive explosion-proof certifications: CE, Mettler Toledo Quality Certificate, FM (IS Cl. I, II, III, Div 1, GR ABCDEFG / T6), ATEX/IECEx (Ex ia IIC T6 / T5 / T4 / T3 Ga / Gb), PED. Intrinsically safe design for safe use in explosive gas hazardous areas.

2. Specifications

表格

Parameter	Value
Brand	Mettler Toledo (Switzerland)
Model	InPro4800/SG/225/PT1000
Order No.	52003544
Product Series	InPro4800(i) series
Product Type	Analog in-line combination pH electrode
Signal Type	Analog (not ISM digital)
Measurement Parameter	pH (SG also measures ORP)
pH Sensing Technology	High Alkali resistant (HA) glass membrane
pH Range	0 ~ 14
ORP Range (using SG)	-1500 ~ +1500 mV (typical)
Reference System	Gel electrolyte + PTFE annular diaphragm + pressure compensated double chamber Ag/AgCl
Electrolyte Type	Gel electrolyte
Refillable	No (maintenance-free)
Diaphragm Type	PTFE annular diaphragm
Reference Element	Ag/AgCl, double chamber
Solution Ground (SG)	Platinum auxiliary electrode, eliminates ground loops, supports diagnostics, also measures ORP
Temperature Sensor	PT1000 (1000Ω at 0°C), built-in
ATC	Yes (with transmitter)
Operating Temperature	-5 °C ~ +130 °C
Operating Pressure	0 ~ 12 barg @ 130°C
Safety Factor	3
Shaft Material	Glass
Shaft Diameter	Approx. 12 mm
Electrode Length	225 mm (optional 120/225/360/425mm)
Process Connection	Pg 13.5 thread
Cable Connector	VP (VP6)
Compatible Cable	VP6 series (VP6-ST/VP6-HT, ordered separately)
Compatible Transmitter	Mettler Toledo M300/M400/M700/M800 analog transmitters (ordered separately)
Sterilizable / Autoclavable	No
Explosion-proof	FM: IS Cl. I, II, III, Div 1, GR ABCDEFG / T6; ATEX/IECEx: Ex ia IIC T6/T5/T4/T3 Ga/Gb; PED
Other Certifications	CE, Mettler Toledo Quality Certificate
Response Time	To be confirmed (reference t90 < 10s, new, 25°C)
Accuracy	To be confirmed (reference ±0.01pH)
Calibration	Two-point (pH 4.01/7.00 or 7.00/9.21)
Storage	To be confirmed (reference humidity >80%, 0-50°C, moisturized cap)
Service Life	To be confirmed (reference 6-24 months)
Weight	To be confirmed (reference 80-120g)
Origin	To be confirmed
HS Code	To be confirmed (reference 90271000)
Stock Status	Order available
Warranty	12 months

3. Key Features

High Alkali Resistant HA Glass Membrane, Full pH Range High Accuracy — HA glass membrane developed for harsh conditions and highly alkaline media, effectively overcomes "sodium error/alkaline error" of ordinary glass membranes at high pH, maintains excellent response and accuracy across pH 0-14, especially suitable for strongly alkaline media, chemical reactions, pharmaceutical synthesis, with good mechanical strength and chemical resistance.
Gel Electrolyte + PTFE Annular Diaphragm + Double Chamber, Maintenance-free Anti-fouling — Triple advanced reference design: gel electrolyte (no refilling, maintenance-free, no leakage), PTFE annular diaphragm (low surface energy, anti-fouling anti-clogging, large contact area), pressure compensated Ag/AgCl double chamber (stable reference potential, unaffected by pressure fluctuations), ensures long-term stable operation in fouling media with suspended solids, oils, proteins, sulfides.
Built-in Platinum Solution Ground SG, Ground Elimination + Diagnostics + ORP Dual-use — Platinum auxiliary electrode as SG with three functions: ① eliminates ground loop interference; ② supports advanced sensor diagnostics via SG-to-reference impedance monitoring; ③ also measures ORP/Redox, one electrode dual-use, expanding application scope and reducing spare part cost.
Built-in PT1000 High-precision Temperature Sensor, Full Range ATC — PT1000 platinum RTD (1000Ω at 0°C), real-time temperature measurement, automatic temperature compensation with transmitter, ensures accurate pH measurement across -5 to 130°C. Higher signal resolution and anti-interference than PT100, no manual temperature setting needed.
Wide Temp/Pressure Design, Harsh Industrial Conditions — Operating temperature -5 to 130°C, pressure 0 to 12bar@130°C (safety factor 3), long-term reliable operation in high-temperature, high-pressure, corrosive industrial environments, suitable for chemical reactors, high-temperature pipelines, high-pressure systems.
Analog Output, Good Compatibility Cost-effective — Analog output directly transmits pH mV and PT1000 signals, compatible with Mettler Toledo M300/M400/M700/M800 and third-party analog pH transmitters, flexible system integration, higher cost-effectiveness than ISM digital electrodes, suitable for budget-limited or existing analog system users.
Pg13.5 + VP Connector, Standard Interface Easy Installation — Industrial standard Pg 13.5 thread process connection and VP(VP6) cable connector, universal standard interface, convenient installation, good interchangeability, can directly replace other brand electrodes with same interface, reducing retrofit work. VP6-ST (standard) and VP6-HT (high temperature) cables available.
Glass Shaft, Good Chemical Stability — Glass shaft, approx. 12mm diameter, 225mm length (optional 120/225/360/425mm). Excellent chemical stability, resistant to acids, alkalis, organic solvents, suitable for corrosive media; good light transmittance for internal observation; 225mm adapts to most reactor, pipeline, open channel installation depths.
Comprehensive Explosion-proof Certifications, Hazardous Area Safe Use — FM (IS Cl. I, II, III, Div 1, GR ABCDEFG / T6), ATEX/IECEx (Ex ia IIC T6/T5/T4/T3 Ga/Gb), PED, CE, Mettler Toledo Quality Certificate. Intrinsically safe (ia) design for Zone 0/1/2 explosive gas environments, meeting petrochemical, pharmaceutical, natural gas explosion-proof requirements.
Mettler Toledo Quality, Globally Validated — Mettler Toledo is a global leading precision instrument and process analytics manufacturer with decades of experience. InPro4800 series, as classic premium in-line pH electrodes, validated by hundreds of thousands of installations worldwide in chemical, pharmaceutical, food & beverage, water treatment, power, metallurgy, pulp & paper industries, known for high precision, high reliability, long life, low maintenance.

5. Model Explanation

Product Model: InPro4800/SG/225/PT1000

Order No.: 52003544

Model Code Breakdown:

表格

Code	Meaning	Description
InPro4800	Series	Premium in-line combination pH electrode, built-in temp sensor, harsh condition design
SG	Solution Ground	Platinum auxiliary electrode, eliminates ground loops, supports diagnostics, also measures ORP
225	Length	225mm (optional 120/225/360/425mm)
PT1000	Temp Sensor	Built-in PT1000 platinum RTD (1000Ω at 0°C), ATC

Common Series Models:

表格

Model	Features
InPro4800/120/PT100	Basic, 120mm, PT100, no SG
InPro4800/225/PT1000	Basic, 225mm, PT1000, no SG
InPro4800/SG/225/PT1000	With SG, 225mm, PT1000 (this product)
InPro4800/SG/120/PT1000	With SG, 120mm, PT1000
InPro4800/SG/360/PT1000	With SG, 360mm, PT1000
InPro4800i/SG/225	ISM digital, with SG, 225mm, K8S connector

Analog vs ISM Digital:

表格

Comparison	InPro4800/SG (Analog, this product)	InPro4800i/SG (ISM Digital)
Signal	Analog (pH mV + PT1000)	ISM Digital
Connector	VP6	K8S
Plug and Measure	No	Yes
DLI / Adaptive Calibration / EDS	No	Yes
Anti-interference	Good (注意 grounding)	Strong (digital)
Price	Lower	Higher

Related Products (ordered separately):

Transmitters: M300/M400/M700/M800 analog pH transmitters
Cables: VP6-ST (standard, -30~70°C), VP6-HT (high temperature)
Mounting: InFit series wells, immersion brackets, flow assemblies
Buffers: pH 4.01, 7.00, 9.21 standard buffers
Storage cap: moisturized storage cap

6. Why Choose Us

Professional Procurement, Quality Guaranteed — All Mettler Toledo products through professional channels, genuine original products with calibration certificate and quality documents, 12-month warranty. Pre-shipment appearance inspection, model confirmation, order number verification, packaging check.
Worldwide Delivery, Professional Instrument Logistics — DHL/FedEx/UPS international courier, global delivery. Shock-proof moisture-proof anti-static packaging for fragile pH glass membranes. Expedited logistics and customs clearance available, delivery to 200+ countries.
Professional Technical Support, Full-process Service — Selection consultation (measuring range, temp/pressure, medium, installation, reference system, SG/explosion-proof, analog vs digital), transmitter/cable matching (M300/M400/M700/M800, VP6-ST/HT), calibration support, fault diagnosis (reading abnormality/drift/calibration failure/ground loop/diaphragm fouling), lifetime assessment.
Flexible Procurement, Spare Parts Packages and Framework Agreements — Single unit and bulk orders, tiered discounts. Liquid analysis instrument spare parts packages (pH+ORP+conductivity+DO electrodes + transmitter + cable + buffers) and annual framework agreements for chemical/pharmaceutical/water treatment/power industries.
Pre-shipment Verification, Test Report Available — Appearance, packaging, model, order number checks; electrode internal resistance test, glass membrane integrity check, PT1000 resistance verification, calibration data reading report available if needed.

7. Frequently Asked Questions (FAQ)

Q1: What is InPro4800/SG/225/PT1000? Difference from InPro4260i? What does SG mean?

A: The InPro4800/SG/225/PT1000 (Order No. 52003544) is a Mettler Toledo analog in-line combination pH electrode with built-in PT1000 and platinum Solution Ground (SG), designed for harsh industrial conditions.

Basic info: Brand Mettler Toledo (Switzerland), analog type, pH 0-14, -5~130°C, 0~12bar@130°C, 225mm, VP6 connector.

Difference from InPro4260i: InPro4800 is analog (VP6, PT1000, gel electrolyte, PTFE diaphragm); InPro4260i is ISM digital (K8S, digital temp, Xerolyt Extra polymer, open junction, Argenthal silver trap, Plug and Measure/DLI/adaptive calibration). InPro4800 is cost-effective general-purpose; InPro4260i is flagship digital for highly demanding chemical.

SG = Solution Ground: Built-in platinum auxiliary electrode with three functions: ① Eliminates ground loop interference; ② Supports advanced diagnostics via impedance monitoring; ③ Also measures ORP/Redox (typical -1500~+1500mV).

Q2: Analog or digital? What transmitters and cables?

A: Analog electrode. Compatible transmitters: Mettler Toledo M300/M400/M700/M800 and third-party transmitters with analog pH input (≥10^12Ω) and PT1000 input. Compatible cables: VP6-ST (standard, -30~70°C) and VP6-HT (high temperature), must use Mettler Toledo VP6 dedicated cable. Note: ISM digital electrodes (K8S) cannot use VP6 cable; third-party transmitters may not support SG advanced diagnostics.

Q3: PTFE diaphragm vs open junction? Gel electrolyte refillable?

A: InPro4800 uses PTFE annular diaphragm + gel electrolyte; InPro4260i uses open junction + Xerolyt Extra polymer. PTFE diaphragm: strong anti-fouling, low clogging risk, for general industrial/moderate fouling media. Open junction: no diaphragm at all, fundamentally no clogging, for extreme high-fouling media (suspended solids, proteins, sulfides, oils). Gel electrolyte is NOT refillable — sealed inside, maintenance-free, replace electrode at end of life. Selection: moderate fouling → InPro4800 (cost-effective); extreme fouling → InPro4260i (longer life).

Q4: Resistant to strong alkali? What is HA glass membrane? Accurate at high pH?

A: Yes. HA = High Alkali resistant glass membrane, specially developed for highly alkaline media. Ordinary glass membranes suffer "sodium error" at pH>10 (reading low due to sodium ion response), error up to 0.5pH at pH 12. HA membrane through special formulation significantly reduces sodium error, accurate across pH 0-14. For high alkali conditions, calibrate with pH 9.21/10.01 alkaline buffer (not only acidic), calibrate every 2-4 weeks. Applications: chlor-alkali (pH 13-14), chemical strong alkali reactions (pH 11-13), pulp & paper (pH 12-14), alkaline CIP (pH 11-13), textile desizing/scouring, alkaline wastewater neutralization.

Q5: Explosion-proof certified? Usable in hazardous areas?

A: Yes, comprehensive certifications: FM (IS Cl. I, II, III, Div 1, GR ABCDEFG / T6), ATEX/IECEx (Ex ia IIC T6/T5/T4/T3 Ga/Gb), PED, CE. Ex ia is highest intrinsic safety grade, usable in Zone 0 (explosive gas continuously present). Conditions for hazardous area use: ① Must pair with IS transmitter or safety barrier (zener/isolated); ② Cable parameters (length, capacitance, inductance) within barrier allowable range; ③ Use explosion-proof junction boxes, glands, separate IS/non-IS cable routing; ④ Qualified professionals for design/installation/maintenance. Applications: petrochemical, pharmaceutical (organic solvents), paint & coatings, natural gas, alcohol production.

Q6: How to calibrate? How often? Lifetime?

A: Two-point calibration: ① Prepare fresh buffers (acidic/neutral: pH 7.00+4.01; neutral/alkaline: pH 7.00+9.21; high alkali: pH 9.21/10.01); ② Rinse with DI water, gently shake dry (do not wipe glass membrane); ③ Immerse in first buffer (pH 7.00), wait stable (1-2min), confirm zero; ④ Rinse, immerse in second buffer, wait stable, confirm slope; ⑤ Verify with buffer, error should be within ±0.05pH.

Calibration cycle: High precision/critical process (pharma, chemical, high alkali): 2-4 weeks; environmental discharge monitoring: 1-3 months (per regulation); water treatment/general process: 1-3 months; clean medium/low accuracy: 3-6 months. Calibrate immediately if reading drift, slow response, large lab deviation.

Normal range: Slope 95%-103% (new 98%-102%), <90% replace; Zero pH 6.8-7.2, deviation >0.5pH unrecoverable replace.

Lifetime: Room temp neutral clean: 18-24 months; general water/wastewater: 12-18 months; chemical (high temp/strong acid-alkali/organic solvent): 6-12 months; high alkali high temp (pH>12, T>80°C): 3-9 months; harsh media (high suspended/sulfide/frequent CIP): 3-6 months. Replace when: slope <90%, zero deviation >0.5pH, response t90>30s, unstable/drifting, glass membrane cracked, reference poisoned (diaphragm blackened), PT1000 damaged.

Q7: In stock? Lead time? Price?

A: Currently Order Available. InPro4800 series is commonly used standard pH electrode, but specific inventory fluctuates. Lead time: standard 4-8 weeks (professional channel ordering or global stock allocation); some common configurations may be in stock, subject to formal quotation. Price: subject to formal quotation, depends on quantity, channel, calibration certificate/technical service; bulk tiered discounts. Expedited service available for urgent needs (process fault repair, environmental monitoring emergency, project commissioning). Please indicate quantity, industry, medium, temp/pressure, transmitter model, explosion-proof requirements, desired delivery time and destination when inquiring. Combined quotation available for matching transmitters (M300/M400/M700/M800), VP6 cables (VP6-ST/HT), mounting wells, calibration buffers — more favorable pricing.

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