Heating oven L, LT 5/13

for general applicationslaboratorymuffle

Overview
These muffle furnaces use multi-layer lightweight refractory-brick insulation to achieve a maximum working temperature of 1300 °C (recommended 1200 °C for long dwell times). Heating elements mounted on support tubes radiate directly into the chamber, enabling short heating times. Models available: L and LT in sizes 5/13, 9/13 and 15/13.

Function and equipment
Heating elements on support tubes provide free radiation into the furnace chamber for rapid, even heating. The chamber lining consists of robust lightweight refractory bricks for Tmax = 1300 °C. The dual-shell, ventilated stainless-steel housing lowers external surface temperature and increases mechanical stability. Door variants: flap door (L) usable as a work platform or lift door (LT) with the hot surface oriented away from the operator. Air inlet in the door is adjustable; exhaust outlet is in the rear wall. Controller: B510 touch (5 programs × 4 segments). Solid-state relays ensure low-noise operation. NTLog Basic supports process-data recording via USB flash drive.

Standard equipment

• Tmax 1300 °C
• Two-sided heating
• Heating elements on support tubes for free heat radiation and long service life
• Multi-layer insulation with robust lightweight refractory bricks in the chamber
• Dual-shell ventilated stainless-steel housing for low external temperatures and high stability
• Optional flap door (L) usable as work platform or lift door (LT) with hot surface facing away from operator
• Adjustable air inlet in the furnace door
• Exhaust air outlet in the rear wall
• Controller B510 (touch): 5 programs × 4 segments
• Solid-state relays for low-noise operation
• NTLog Basic for process-data recording via USB

Additional equipment

• Chimney; chimney with fan; catalytic converter for exhaust treatment
• Over-temperature limiter with adjustable trip temperature to protect furnace and load
• Protective-gas connection for purging with non-flammable process gases (not gas-tight; not combinable with some exhaust options)
• Manual or automatic gas supply system
• Port(s) for thermocouples in rear wall or furnace door
• Process control and documentation via VCD software package

Technical specifications (excerpt)
Model | Tmax (°C) | Inner W × D × H (mm) | Volume (l) | Outer W × D × H (mm) | Temp uniformity ±5 K (W × D × H mm) | Connected load (kW) | Electrical connection | Weight (kg) | Heating time (min)
L, LT 5/13 | 1300 | 225 × 170 × 130 | 5 | 490 × 450 × 580+320 | 170 × 100 × 80 | 2.6 | 1‑phase | 46 | 55
L, LT 9/13 | 1300 | 250 × 240 × 170 | 9 | 530 × 525 × 630+350 | 180 × 170 × 120 | 3.3 | 1‑phase | 58 | 60
L, LT 15/13 | 1300 | 250 × 340 × 170 | 15 | 530 × 625 × 630+350 | 180 × 270 × 120 | 3.5 | 1‑phase | 71 | 80

Notes
1) Recommended working temperature for prolonged dwells: 1200 °C. 2) External dimensions vary with optional equipment; dimensions on request. 3) Outer dimensions include opened lift door for LT models. 4) Heating time: empty, closed furnace to Tmax −100 K (230 V 1/N/PE). 5) Temperature uniformity ±5 K measured in empty workspace according to DIN 17052‑1 for temperatures above 800 °C.

Characteristics / technical data

• Maximum working temperature: 1300 °C (recommendation 1200 °C for long holds)
• Heating arrangement: radiant heating from two sides, elements on support tubes
• Furnace lining: multi-layer lightweight refractory bricks
• Housing: ventilated dual-shell stainless-steel construction
• Door options: flap (L) or lift (LT)
• Operator features: adjustable fresh-air inlet in door, rear exhaust outlet
• Controller and data logging: B510 (touch) and NTLog Basic via USB; VCD software option
• Safety and process options: over-temperature limiter, protective-gas purge, gas supply systems, thermocouple ports, exhaust treatment