Low-emissivity (Low-E) glass is designed to improve building energy efficiency. However, it poses challenges for traditional infrared measurement because the coated surface reflects ambient radiation and emits limited thermal energy. The Optris Top-Down Glass Inspection System (GIS) addresses this issue by using two high-resolution PI 640i G7 online thermal camera units mounted above the tempering line. It also includes a CT G5L reference pyrometer installed underneath for automatic emissivity correction on both standard and Low-E glass. This dual-sensor setup provides stable and repeatable temperature data right after the furnace, allowing for precise control of heating and cooling zones. The PI 640i G7 Infrared cameras create a detailed thermal map with a resolution of 640 × 480 pixels, a fast frame rate of 32 Hz (up to 125 Hz in line-scan mode), and excellent thermal sensitivity. Together with the integrated line scan function in PIX Connect, the system supports continuous monitoring of fast-moving glass sheets. It can quickly detect defects, cold spots, or uneven temperature patterns. A significant feature is the digitally controlled lens protection system (DCLP), which keeps the optics clean without requiring extra air purging. This ensures reliable long-term operation in harsh furnace conditions. The system is delivered as a pre-assembled turnkey package that includes a control cabinet, industrial process interface, shutters, and complete cabling. This leads to fast installation and minimizes production downtime. For customers, the Top-Down GIS provides clear benefits: fewer rejects, improved process stability, higher throughput, and consistent quality of tempered glass for architectural glazing, façade glass, insulated multi-pane units, and coated specialty products. As an effective online thermal cameras solution, it makes temperature distribution visible in real time, transforming thermal data into a valuable tool for quality assurance and optimized glass hardening processes.
Top-Down GIS 640 R - Glass Inspection System for Glass Tempering - Important Features:
- Top-down system with additional reference pyrometer from below for automatic emissivity correction
- Digitally controlled lens protection system (DCLP) avoids extra air purging
- Glass area calculation
- Pre-assembled system for easy installation on glass tempering furnaces
- Automatic scan line adjustment – insensitive to distortions
| MODEL | TDGIS 640 G7 33°x25° | TDGIS 640 G7 60°x45° | TDGIS 640 G7 90°x64° |
| DETECTOR | |
| Optical resolution | Full resolution: 640×480 pixels
Linescan: 640×120 pixels |
| Pixel pitch | 17 µm |
| Detector | Uncooled bolometer |
| Spectral Range | 7.9 µm |
| Optical Filter | Integrated |
| Frame rate | Full resolution: 32 Hz
Linescan: 125 Hz |
| OPTICAL | |
| Field of View | 33°x25° | 60°x45° | 90°x64° |
| Focal length [mm] | 18.7 mm | 10.5 mm | 7.7 mm |
| F Number | 0.8 | 0.8 | 0.8 |
| Optical Resolution | 354:1 | 181:1 | 105:1 |
| Minimum Distance to Target | 300 mm | 200 mm | 200 mm |
| Interchangeable optics | Yes |
| MEASUREMENT | |
| Object Measurement Range | 200 °C … 1500 °C
150 °C … 900 °C
(Sighting range 0 °C … 250 °C) |
| Accuracy | ±2 °C or ±2 %, whichever is greater **6) |
| Thermal Sensitivity (NETD) | 80 mK |
| Smallest detectable Spot Size IFOV: 1 pixel | 0.3mm | 0.4mm | 0.7mm |
| Smallest measurable Spot Size MFOV | 0.9mm | 1.2mm | 2.1mm |
| Measurement Field of View (MFOV) | 3×3 pixels |
| Warm-up time | 10 min |
| Emissivity /Transmissivity/ Reflectivity | adjustable: 0.100…1.100 |
| INTERFACES | |
| Interface | Ethernet over USB GigE (PoE) interface |
| Supported Protocols | Ethernet (max. 1000 Mbit/s) |
| Compatible Software | PIXConnect, ConnectSDK, EasyAPI, ExpertAPI |
| IMAGE PROCESSING | |
| Configuration | via PIXConnect |
| Operation | computer-enabled |
| Capabilities | For Measurements on Glass, Measure Areas of Interest, Linescanner, EventGrabber, Merger, Alarming, Comparison Functions, Temperature-Time Diagrams, Temperature Profiles, Recording & Playing, Triggering |
| REFERENCE PYROMETER – DETECTOR | |
| Detector | Thermopile |
| Measurement Principle | Single Color |
| Spectral Range | 5.0 μm |
| Response Time | 120 ms |
| Exposure Time | 120 ms |
| Sampling Frequency | 8 Hz |
| Sensing Head Exchangeable | Yes |
| REFERENCE PYROMETER- OPTICAL | |
| Distance to Spot ratio (D:S) | 10:1 |
| Spot size (SF optics) | 7 mm |
| Smallest spot (CF optics / add. CF lens) | N/A |
| Distance | independant |
| REFERENCE PYROMETER – SIGHTING | |
| Sighting | none |
| REFERENCE PYROMETER – MEASUREMENT | |
| Object Measurement Range | L: 100 … 1200 °C |
| Accuracy | ±2 °C or ±1 % **2) |
| Repeatability | ±0.5 % or ±0.5 °C **1) **2) |
| Temperature Coefficient | ±0.05 K/ K or ±0.05 %/ K **3) |
| Thermal Sensitivity (NETD) | L: 100 mK |
| Warm-up time | none |
| Emissivity /Transmissivity/ Reflectivity | 0.100 – 1.100 |
| Slope | N/A |
| GENERAL | |
| Shutter Size | 116 x 57 x 121 mm |
| Cabinet Size | 400 x 200 x 155 mm |
| Housing Material | Stainless Steel |
| Weight | 13 kg (complete system) |
| Focus | fixed |
| Country of Origin | Germany |
| ENVIRONMENTAL & CERTIFICATIONS | |
| Operating Temperature Range | 0…50°C |
| Storage Temperature Range | -40…85 °C |
| Relative humidity | 10 – 95 %, non condensing |
| Protection Class | IP 65 |
| EMC | 2014/30/EU |
| Shock | IEC 60068-2-27 (25 G and 50 G) |
| Vibration | IEC 60068-2-6 (sinus shaped)
IEC 60068-2-64 (broadband noise) |
| Standards | CE, UKCA, RoHS |
| POWER | |
| Power Supply | 100-230 VAC / 24 VDC |
| Current Draw | 3A |
| ACCESSORY | |
| Shutter for IR Camera | Included |
| Shutter for Reference Pyrometer | Included |
| Cabinet | Included |
| Remote control | Included |
| | |
| Part number | OPTTDGIS64IO33R | OPTTDGIS64IO60R | OPTTDGIS64IO90R |
| Additional Remarks | 1) 90% energy
2) at ambient temperature 23 ± 5°C, object temperature > 0°C ;
3) for ambient temperatures <18°C and >28°C; whichever is greater
4) 90% value
5) diameter of measured area
6) Accuracy statement effective from 150 °C |
