Laboratory hot plate GHP 721S-900 mm

electricdigitalautomatic

Overview
The GHP 721S-900 mm is a guarded hot plate system with a tiltable, fully insulated test chamber for precise measurement of thermal conductivity and U-value of insulation materials, thick specimens and insulating glass. The instrument is controlled and logged via an external Lambda Control desktop unit connected to a PC running Lambda software.

Applications

• Determination of thermal conductivity (λ) of insulation and construction materials and insulating glass as a function of temperature and mounting angle.
• Measurements of large, thick or heavy specimens with top insertion to reduce risk of damage to measurement plates.
• U-value determination for glazing and window systems under variable mounting angles and gas conditions.

Key features

• Guarded hot plate principle with hot plate, guard ring and cold plates to minimize lateral heat losses.
• Tiltable, electrically operated test chamber allowing 0°–90° mounting for vertical to horizontal specimens.
• Top insertion of specimens for safe handling of heavy or complex samples.
• One-plate and two-plate measurement methods available according to ISO 8302 and related standards.
• Selectable heating plate dimensions (heating area from 200×200 mm up to 500×500 mm) to adapt to sample geometry.
• Cold plates and chamber temperature control via chiller systems.
• Specimen fixation/positioning system to ensure reproducible contact and alignment.
• External PC control, data acquisition and evaluation with Lambda software (user levels, customizable reports, graphical displays).
• Designed for R&D and characterization under different atmospheres, temperatures and pressures.

Principle of operation
The hot plate and guard ring are held at the hot plate temperature while one or two identical samples are placed between hot and cold plates. A controlled temperature difference ΔT is established across sample thickness. The guard ring minimizes lateral heat losses, enabling steady-state measurement of heat flow and calculation of thermal conductivity.

Standards and method notes

• Measurement methods comply with standards such as ISO 8302 and ASTM C177 (guarded hot plate) and relevant EN standards where applicable (EN 1946-2, EN 12664, EN 12667, EN 12939).
• Available one-plate and two-plate methods according to ISO 8302 sections for single- and two-specimen measurements.

Accessories / Options

• Specimen adapter plates for single-specimen mode and special configurations.
• Different heating plate sizes to match bricks, panels or glass dimensions.
• Auxiliary equipment for loose materials, granulates, composite stacks and reference materials for validation and routine checks.

Technical specifications

• Measuring range: 0.005 to 2.0 W/(m·K), depending on material and thickness.
• Specimen area (L × W): 900 mm × 900 mm; heating area selectable from 200×200 mm up to 500×500 mm.
• Specimen thickness (H): 1-plate method: single specimen 15 mm to 380 mm; 2-plate method: two specimens 2 × 15 mm to 2 × 180 mm.
• Temperature range: cold plate −10 °C to 60 °C; heating plate 0 °C to 70 °C (device dependent).
• Interfaces: 1 × RS-232, 1 × Gigabit Ethernet.
• Dimensions (H × W × D): approx. 235 cm × 130 cm × 120 cm.
• Power supply: 110 V to 230 V, 50/60 Hz.
• Weight: approx. 256 kg.
• Tilting: electrically operated mechanism with angle indicator (0°–90°) shown on LCD.
• Chamber: fully insulated guarded test chamber designed for specimens up to 380 mm thickness.
• Software: control, data acquisition and evaluation via external PC running Lambda software (multiple temperatures, graphical display, automated routines, customized reports).