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Key: test item, instrument name, total nonvolatile migration, gravimeter, moisture permeameter

Product

Constant Weight Determinating Analyzer of Residue after Evaporation on Water Bath

Tester of Residue after Evaporation can test the dissolving-out amount of test sample soaked in specified liquid
Focusing on packaging and material testing technology, we are committed to quality control in industries such as healthcare, pharmaceuticals, food, packaging, textiles, and new materials. Our products are widely used in enterprises, testing institutions, universities, and research institutes.

Category:

Constant Weight Analyzer

Water Bath Drying Constant Weight

ETR Series Water Bath Evaporation & Constant Weight Tester

Function and Usage:

The ETR Series is an advanced analytical instrument designed for the determination of dry residue, non-volatile matter, total migration, volatile substances, moisture content, and soluble/insoluble quantities.

Utilizing a precision water bath evaporation method, this system effectively replaces the traditional combination of water baths, drying ovens, desiccators, and analytical balances, delivering fully automated constant weight analysis. It is ideal for pharmaceutical, food, packaging, and materials testing laboratories requiring high-precision residue and migration testing.

Working Principle:

The instrument executes a fully automated four-stage process:
Evaporation: Samples are heated uniformly in a precision water bath to evaporate solvents.
High-Temperature Drying: Samples are transferred to a drying chamber to remove residual volatiles.
Cooling: Samples are cooled to ambient conditions in a controlled environment.
Constant Temperature Weighing: Samples are weighed automatically under stable temperature and humidity until constant weight is achieved.

Features:

Complies with national standards and features a fully automated four-process system: water bath, drying, cooling, and weighing.
Precise and efficient: Achieves 0.3mg constant weight with just 2 drying cycles. Available with 12、18, 23, 33, 46, or 69 workstations.
Safe: Indirect heating design to prevent combustion and explosion. Equipped with over temperature power off protection and water level protection.
Compact: Water bath chamber, drying oven, cooling unit and weighing balance are integrated into one unit, footprint reduction.
Features patented: heat insulation, moisture proof, and anti-corrosion technology for the balance, ensuring its stability and long service life.
Digitally set test parameters, fully automated operation without manual intervention. Offers two test modes: constant weight and constant time.
Equipped with METTLER TOLEDO balance.
Software: Provides graphical, full process and all element monitoring, along with multiple report formats.
Optional: GMP "Computerized System" functional module.
Optional: High - efficiency solvent recovery device.

Compliant Standards:

The ETR Series meets and exceeds the requirements of major pharmacopeias and international standards:
Chinese Pharmacopoeia (ChP): General Chapters – Extractives Determination, Loss on Drying, Total Solids.
USP <921> Weight Loss on Drying.
European Pharmacopoeia (EP) 9.0: Purified Water.
YBB 00342002, YBB 00132002 (Pharmaceutical Packaging Materials).
GB 31604.8, GB 5009.3, GB 8538, GB/T 9740, GB/T 2914
ISO 759:1981 Plastics — Determination of loss of mass at elevated temperatures.
GB/T 5750.4, GB/T 14415, GB 5413.39, DZT 0064.9

Specification

Name	Parameter		Name		Parameter
Constant Weighting Error	0.3 mg,(2 heating cycles)		Residue Range		0 to 80g
Balance Range	210 g		Balance resolution		0.1 mg
Temperature Error	0.5 ℃		Evaporating Temp		Room Temp to 100 ℃
Drying Temperature	Room Temp to 140 ℃		Weighing Temp		room Temp to 80 ℃
Evaporite Mode	Water bath		Weighing humidity		＜20%
Evaporating Utensil	100 mL,(Optional: 50, 200 mL)		Connect Pipe		Φ8 mm
Air Pressure	>0.3 MPa		Solvent Recovery Rate		95% (Optional: Solvent Recovery Machine)
Power Supply	AC220V /110V ;50/60Hz
Model	Model
	ERT-231-C	ERT-331-C		ERT-462-C		ERT-693-C
Specimen Count	23	33		46		69
Balance Count	1	1		2		3
Size	1300x870x1160 (L×B×H) mm
Net Weight	~170kg	~175kg		~180kg		~185kg
Power Consumption	<10,000 W

Configuration: Principal Machine, Dryer Machine, Evaporating Utensil, Computer, Professional software, Valve Suits.

Optional: Solvent Recovery Machine, Analytical balance(Accuracy of 0.01mg).

User self-provided: Compressed air、Distilled water, tap water.

Frequently Asked Questions (FAQ)

Q1: How does this system replace traditional methods?

A: The ETR integrates the entire workflow—water bath evaporation, drying oven, desiccator cooling, and analytical weighing—into one automated process. This removes human error, ensures repeatability, and drastically reduces labor time compared to manual transfer between separate instruments.

Q2: Is the instrument compliant with GMP and Pharmacopoeia requirements?

A: Yes. The ETR is designed specifically for regulated environments. It supports Chinese Pharmacopoeia, USP, and EP methods. With the optional GMP module, it fulfills FDA 21 CFR Part 11 requirements for electronic records and signatures.

Q3: What is the benefit of the patented balance protection?

A: Traditional balances fail quickly in hot/humid environments. Our patented insulation and anti-corrosion design isolates the balance from heat and moisture, maintaining 0.1 mg accuracy and extending the balance's lifespan significantly.

Q4: Which model should I choose?

A: Choose based on daily sample throughput:

ERT-231-C: Ideal for QC labs with moderate workload.

ERT-462-C / 693-C: Best for high-volume testing, contract research organizations (CROs), and production environments.

Q5: Is the solvent recovery system worth it?

A: Absolutely. The optional recovery unit captures up to 95% of solvents, which reduces hazardous waste disposal costs and minimizes laboratory VOC emissions, making it both economically and environmentally beneficial.

Function:
Constant weight tests for loss on drying, non - volatile substances, residue quantity, total migration, volatile substances, moisture content, soluble and insoluble quantities.
It can replace water baths, drying ovens and balances to achieve constant weight .

Working Principle:
Water bath evaporation; high temperature drying; drying and cooling; constant temperature weighing.
Conforming to Standards:
Constant weighting requirement in Chinese Pharmacopoeia, Extractives Determination Method" in Part Four of the Chinese Pharmacopoeia、Loss on Drying Determination Method、Total Solids Determination Method、USP40-NF35<921>、YBB 00342002、YBB00132002、GB 31604.8、GB5009.3、GB 8538、DZT0064.9、GBT14415、GBT5750.4、GB/T 9740、GB/T2914、GB5413.39、ISO 759、"Purified Water" in Part Two of the Chinese Pharmacopoeia、EP9.0 WATER, PURIFIED
Features
- Complies with national standards and features a fully automated four-process system: water bath, drying, cooling, and weighing.
- Precise and efficient: Achieves 0.3mg constant weight with just 2 drying cycles. Available with 12、18, 23, 33, 46, or 69 workstations.
- Safe: Indirect heating design to prevent combustion and explosion. Equipped with over temperature power off protection and water level protection.
- Compact: Water bath chamber, drying oven, cooling unit and weighing balance are integrated into one unit, footprint reduction.
- Features patented: heat insulation, moisture proof, and anti-corrosion technology for the balance, ensuring its stability and long service life.
- Digitally set test parameters, fully automated operation without manual intervention. Offers two test modes: constant weight and constant time.
- Equipped with METTLER TOLEDO balance (0.1mg).
- Software: Provides graphical, full process and all element monitoring, along with multiple report formats.
- Optional: GMP "Computerized System" functional module.
- Optional: 1.High - efficiency solvent recovery device; 2. 0.01mg analytical balance.

Specification

Name	Parameter		Name		Parameter
Constant Weighting Error	0.3 mg （2 heating cycles）		Residue Range		0～80 g
Balance Range	210 g		Balance resolution		0.1 mg
Temperature Error	0.5 ℃		Evaporating Temperature		Room Temperature ～100 ℃
Drying Temperature	Room Temperature～140 ℃		Weighing Temperature		room～80 ℃
Evaporite Mode	Water bath		Weighing humidity		＜20%
Evaporating utensil capacity	100 mL (Optional: 50, 200 mL)		Connect Pipe		Φ8 mm
Air Pressure	>0.3 MPa		Solvent Recovery Rate		95% (Optional: Solvent Recovery Machine)
Power Supply	AC220V /110V ;50/60Hz
Model	Model
	ERT-231-C	ERT-331-C		ERT-462-C		ERT-693-C
Specimen Count	23	33		46		69
Balance Count	1	1		2		3
Size (L×B×H) mm	1300x870x1160 mm
Net Weight	~170kg	~175kg		~180kg		~185kg
Power Consumption	<10,000 W

Configuration: Principal Machine, Dryer Machine, Evaporating Utensil, Computer, Professional software, Valve Suits.
Optional: Solvent Recovery Machine, 0.01mg analytical balance.
Self-provided: Compressed air, Distilled water, tap water..

Keywords:

none

Ignition Residue and Ash Constant Weight Analyzer