ST-138B Fully automatic refractometer (refractive index meter)
The ST-138B fully automatic refractometer (refractive index meter)
is equipped with high-performance linear CCD photosensitive
components, and is equipped with a semiconductor Peltier super
temperature control system through high-speed and high-precision
signal acquisition and analysis processing technology. It can
efficiently and accurately measure the refractive index (nD) of
various liquids such as transparent, semi transparent, dark, and
viscous, as well as the mass fraction (Brix) of sugar solutions.
Determination of refractive index in accordance with General Rule
0622 of the 2025 edition of the Chinese Pharmacopoeia and
determination of refractive index in accordance with GB 15680-2009
palm oil, GB1535 soybean oil, GB/T 1536-2021 rapeseed oil,
GB/T8233-2018 sesame oil, GB/T 23347-2021 olive oil, GB/T
19111-2017 maize oil, GB/T22479 Sichuan pepper seed oil and other
edible oils. Widely used in the oil and fat industry,
pharmaceutical industry, food industry, daily chemical industry,
sugar industry, etc., it is also one of the commonly used equipment
in schools and related research institutions.
Main features and technical parameters:
| Range | 1.3000-1.7000 (nD) |
| Test mode | refractive index, sugar content, hammer degree |
| Resolution | 0.0001 |
| Accuracy | ± 0.0002 |
| Display mode | 7-inch touch color screen |
| Sugar content range | 0-100% (Brix) |
| Sugar content accuracy | ± 0.05% (Brix) |
| Temp control range | 5℃ - 65℃ |
| Temp control accuracy | ± 0.03℃ |
| Light source | LED light source |
| Wavelength | 589nm |
| Prism | Sapphire grade |
| Sample pool | stainless steel |
| Detection method | Linear CCD |
● Built in Peltier temperature control to improve accuracy and
stability;
● Domestic dual temperature control, sapphire prism;
● LED cold light source replaces traditional sodium lamps and
halogen lamps;
● 7-inch touch color screen, user-friendly operation interface;
Note: The appearance pictures, dimensions, volume, and weight of the
instrument are for reference only. If there are any updates to the
instrument, there may be slight changes without prior notice.
The refractive index of common edible oils
| Product name | Refractive index (n40) |
| Peanut oil | 1.460--1.465 |
| Soybean oil | 1.466--1.470 |
Rapeseed oil | General rapeseed oil | 1.465--1.469 |
| Low mustard pickled Chinese cabbage seed oil | 1.465--1.467 |
| Coconut oil | 1.448--1.450 |
| Corn oil | 1.456--1.468 |
| Walnut oil | 1.467--1.482 |
| Sesame oil | 1.465--1.469 |
| Rice bran oil | 1.464--1.468 |
| Cottonseed oil | 1.458--1.466 |
| Grape seed oil | 1.467--1.477 |
| Oil tea seed oil | 1.460--1.464 |
| Red flower seed oil | 1.467--1.470 |
| Sunflower seed oil | 1.461--1.468 |
| Palm oil (50 ℃) | 1.454--1.456 |
| Flaxseed oil (n20) | 1.4785-1.4840 |
Shandong Shengtai Instrument Co., Ltd. provides the following
quality assurance for the instruments sold to you:
----The provided instrument materials are brand new, meet national
quality standards, and have a manufacturer's certificate of
conformity;
----The materials and main components provided meet the technical
requirements specified in the technical documentation;
----The overall quality assurance period of the equipment is one
year (excluding normal wear and tear of vulnerable parts).
----We are responsible for free maintenance of any instrument
quality issues that occur during the warranty period. Due to
equipment malfunction caused by the user's responsibility, we are
responsible for repairing and charging reasonable fees.
----Lifetime discounted supply of parts for equipment, and lifetime
maintenance and repair of the entire machine.
----After the expiration of the warranty period, if the user needs
maintenance and technical services, we will only charge a cost fee.
