HTHS Tester G-8401 （High Temperature High Shear Viscometer）

The HTHS Tester G-8401 is designed and manufactured in accordance with SH/T 0703 and ASTM D5481 standards, for measuring the viscosity of engine oils under high-temperature, high-shear (HTHS) conditions.Under a constant temperature of 150℃, the oil sample in the injection tube is delivered and metered via an air pump connected to the injection tube. The oil flows through a capillary with an inner diameter of 0.15 mm under an inert gas pressure of 0.5–3.5 MPa, simulating actual high-temperature, high-shear conditions.During the test, the instrument automatically records the duration and stabilized test pressure, and automatically calculates the high-temperature, high-shear viscosity of the oil sample.

Applicable Standards

(1) SH/T 0703-2020

(2) ASTM D5481

Application

This HTHS Viscometer is suitable for measuring the high-temperature, high-shear viscosity of engine oils at 150℃, with a shear rate of 1.4 × 10⁶ s⁻¹, with viscosity expressed in mPa·s.

Features

Equipped with a PLC programmable controller for automatic detection, calculation, and control, requiring minimal manual intervention.4-channel automatic sampling system, enabling simultaneous testing of multiple samples.Heating is performed using a metal heating device, achieving high temperature control accuracy of 150 ± 0.01℃.

Key components, including rotary valves, capillaries, and calibration standard oils, are imported from ConocoPhillips (USA).Features automatic pressure recommendation based on estimated viscosity, facilitating testing.After the test, the instrument automatically calculates results, which can be stored and printed, eliminating the need for additional calculation software.Supports connection to LIMS systems for data transfer and integration.

Main Technical Specifications

(1) Power Supply ：AC 220V ±10%, 50Hz

(2) Temperature Control Accuracy：150 ± 0.01℃

(3) Sample Volume：7 mL ±1 mL

(4) Pressure Range：350 kPa – 4500 kPa

(5) Test Units：4 units

(6) Calibration Accuracy (Repeatability)：Difference between two consecutive measurements of the same sample ≤ 1.0% of the average value

FAQ

1. What is this product?

The HTHS Tester G-8401 is a capillary-type viscometer designed to measure the high-temperature, high-shear viscosity of engine oils in accordance with SH/T 0703 and ASTM D5481.

2. What is this product used for?

It is used to evaluate the viscosity performance of engine oils under simulated engine operating conditions at high temperature and high shear rates.

3. What is the working principle of this product?

The instrument pumps the oil sample through a precision capillary under controlled inert gas pressure at 150℃. By measuring flow time and stabilized pressure, the system automatically calculates the HTHS viscosity.

4. Why is this product important?

HTHS viscosity is a key parameter for engine protection. It reflects the oil’s ability to maintain a stable lubricating film under extreme conditions, directly affecting engine wear and durability.

5. What industries is this product suitable for?

It is suitable for lubricant manufacturers, automotive industry, petrochemical companies, research institutions, and quality inspection laboratories.