How to Choose a Freezing-Point Osmometer: Seven Checks, Applied to the Huanghai HY-4000
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The Huanghai HY-4000 freezing-point osmometer was developed by Huanghai together with leading Chinese medical universities and research institutes, to give pharmaceutical, biomedical and academic labs high-precision, high-stability osmolality testing. It measures 0 to 4,000 mOsm/kg from 0.5 mL of sample in about 3 minutes, and it needs no external chiller water. This guide walks through the seven things that matter most in an osmometer and how the HY-4000 answers each.
Key Takeaways
- The HY-4000 uses freezing-point depression, the method named by ChP, USP, Ph. Eur. and BP.
- It reads 0 to 4,000 mOsm/kg from just 0.5 mL of sample in about 3 minutes.
- Semiconductor cooling means no external chiller water: place it on any bench.
- It is built to the current Chinese Pharmacopoeia and to GB4793.1-2007 and YY0648-2008 for safety.
1. The Method Your Pharmacopoeia Names
For pharmaceutical release testing the method is set by the pharmacopoeia: the Chinese Pharmacopoeia (general chapter 0632), USP <785>, Ph. Eur. 2.2.35 and BP Appendix V N all specify freezing-point depression. The HY-4000 uses exactly this method, so the same instrument serves all four.
2. A Range That Covers Your Samples
The HY-4000 measures from 0 to 4,000 mOsm/kg with a resolution of 0.1 mOsm/kg, wide enough for everything from dilute solutions to concentrated formulations.
3. Accuracy Stated Where It Counts
The HY-4000 states its basic measurement error in two parts: ±3 mOsm/kg at 300 mOsm/kg and below, and ±1.0% above 300 mOsm/kg. Repeatability and cross-contamination are both no more than 1%. That is high precision across the whole range, not a single headline figure.
4. Only 0.5 mL, Ready in About 3 Minutes
The HY-4000 needs just 0.5 mL per test and takes about 3 minutes. Precious samples go further, and a full day of testing moves quickly.
5. No Chiller Water, Small Footprint
The HY-4000 cools with a semiconductor (thermoelectric) system, so there is no external chiller water connection to plumb in. It weighs 15 kg, measures 480 × 350 × 300 mm and runs on 220 V, 50 Hz at 135 VA, so it fits on a normal lab bench.
6. Easy to Run, Results at Your Fingertips
The HY-4000 runs under microcomputer control with step-by-step process guidance, and a 4.3-inch industrial color screen shows measurement status and key test data in real time. The standard model lifts the probe automatically and has a built-in printer for quick data printing. The basic model measures just as well: standard and basic models share the same measurement performance, and differ only in the probe lift (manual on the basic model) and the printer. The difference is covered in HY-4000 Osmometer: Standard vs Basic/Simplified.
7. Built to Recognized Standards
The HY-4000 is fully compliant with the current Chinese Pharmacopoeia. For safety it implements GB4793.1-2007 and the YY0648-2008 specific requirements for in-vitro diagnostic medical equipment.
Who Uses the HY-4000
Pharmaceutical and biologics manufacturers use it for the research, production and quality monitoring of drugs and reagents, and for the pharmacological analysis of traditional Chinese medicines. Universities and research institutes use it for chemistry and biophysics teaching and in agricultural soil science, plant physiology, animal husbandry, aquaculture breeding selection, health products and the beverage industry.
Frequently Asked Questions
What is a freezing-point osmometer?
It is an instrument that measures the osmotic concentration (osmolality) of a solution by freezing-point depression. The HY-4000 reads 0 to 4,000 mOsm/kg from 0.5 mL of sample.
Which osmometer method is right for pharmaceutical testing?
Follow your pharmacopoeia. The Chinese Pharmacopoeia, USP, Ph. Eur. and BP all specify freezing-point depression for osmolality, which is the method the HY-4000 uses.
Does the HY-4000 need cooling water?
No. It uses semiconductor cooling, so no external chiller water is required.
Do the standard and basic models measure the same?
Yes. They share the same measurement performance and differ only in the probe lift (automatic or manual) and the printer.
Next Step
Send us what you test and how many samples you run each day, and we will recommend the HY-4000 model that fits. See the HY-4000 freezing-point osmometer, the osmometer collection, or read Freezing-Point Osmometry for Pharma & Biologics QC for the full background.