HFM L57 – Thermal Conductivity Meter
HFM L57 thermal conductivity meter for fast, easy, and reliable measurement of low-conductivity insulating materials.
HFM L57: Thermal Conductivity Meter
The LINSEIS Heat Flow Meter L57 (HFM L57) is an easy-to-use instrument for determining the thermal conductivity of insulating materials with low thermal conductivity and other materials. The system delivers fast, accurate, and reliable results, while its unique design enables measurements within only a few minutes.
Peltier-based heating and cooling technology provides high-precision temperature control while reducing maintenance requirements and downtime. The excellent long-term stability allows accurate aging studies, while fast measurement cycles of only 15 minutes ensure a high sampling rate.
To achieve these fast and accurate measurement intervals, the system utilizes a dual-sensor arrangement. Built-in potentiometers for thickness measurements with μm resolution provide instant sample thickness determination during operation.
☑️ Clean system design with improved insulation and optimized electronics
☑️ Unrivaled precision and high accuracy
☑️ Low power consumption
☑️ Instrument design based on ASTM C518, JIS A1412, ISO 8301, DIN EN 12664, and DIN EN 12667 standards
Unique Features
☑️ High accuracy – two built-in linear potentiometers ensure precise sample thickness measurement
☑️ Maintenance-free operation – robust design with minimal maintenance requirements thanks to Peltier-based heating and cooling technology
☑️ Integrated condensation protection system – prevents moisture condensation during measurement
☑️ Fast test cycles – typical measurement time of only 15 minutes
☑️ Excellent long-term stability – ideal for long-term aging studies
Operating the device
Integrated condensation protection system
To prevent the moisture content from affecting the thermal conductivity
Specifications
| Model | HFM L57 200 | HFM L57 300 | HFM L57 600 |
|---|---|---|---|
| Temperature range (plates) | 0°C to 90°C -20°C to 90°C -35°C to 90°C | 0°C to 90°C -20°C to 90°C -35°C to 90°C | -20°C to 70°C |
| Cooler | External cooler or thermostat | External cooler or thermostat | External cooler or thermostat |
| Temperature control | Peltier | Peltier | Peltier |
| Temperature resolution | 0.0001 °C | 0.0001 °C | 0.0001 °C |
| Measurement data points | Up to 100 | Up to 100 | Up to 100 |
| Sample size | 200 × 200 mm, up to 90 mm thickness | 300 × 300 mm, up to 100 mm thickness | 600 × 600 mm, up to 200 mm thickness |
| Thermal resistance range | 0.2 to 8.0 m²·K/W With extension set: 0.036 to 9.0 m²·K/W | 0.2 to 8.0 m²·K/W With extension kit: 0.036 to 8.0 m²·K/W | 0.2 to 8.0 m²·K/W With extension kit: 0.036 to 8.0 m²·K/W |
| Thermal conductivity range | 0.001 to 0.5 W/m·K With extension set: 0.001 to 2.2 W/m·K | 0.001 to 0.5 W/m·K With extension kit: 0.001 to 2.5 W/m·K | 0.001 to 0.5 W/m·K With extension kit: 0.001 to 2.5 W/m·K |
| Reproducibility | 0.25% / 0.5% | 0.25% / 0.5% | 0.25% / 0.5% |
| Accuracy | ±1 to 2% | ±1 to 2% | ±1 to 2% |
| Variable contact pressure | Up to 1.3 kPa, optional up to 25 kPa | Up to 1.3 kPa, optional up to 25 kPa | Up to 1.3 kPa, optional up to 25 kPa |
