Technical Details of the optris CTfast LT

Measurement Specifications

• Temperature range (scalable via programming keys or software): -50°C … 975°C (-58 °F to 1787 °F)
• Spectral range: 8 to 14 µm
• Optical resolution (90% energy):
  15:1 (LT15F)
  25:1 (LT25F)
• System accuracy¹⁾²⁾ (at ambient temperature 23 ± 5°C [73.4 ±41 °F]): ± 1% or ± 2°C (± 3.6 °F)
  
• Repeatability¹⁾²⁾ (at ambient temperature 23 ± 5°C [73.4 ±41 °F]): ± 0.75% or ± 0.75°C (± 1.4 °F)
  
• Temperature resolution (NETD):
  0.2 K²⁾³⁾ (LT15F)
  0.4 K²⁾³⁾ (LT25F)
• Response time⁴⁾:
  analog output (90%): LT15F 9 ms, LT25F 6 ms
  digital output (50%): LT15F 4 ms, LT25F 3 ms
• Emissivity / Gain (adjustable via programming keys or software): 0.100 – 1.100
• Transmissivity (adjustable via programming keys or software): 0.100 – 1.100
• Signal processing (parameter adjustable via programming keys or software, respectively):
  peak hold, valley hold, average, extended hold function with threshold and hysteresis

General Specifications

• Environmental rating: IP 65 (NEMA-4)
• Ambient temperature:
  sensing head: -20°C … 120°C (-4 °F … 248 °F)
  electronics: 0°C … 85°C (32 °F … 185 °F)
• Storage temperature:
  sensing head: -40 … 120°C (-40 °F … 248 °F)
  electronics: -40°C … 85°C (-40 °F … 185 °F)
• Relative humidity: 10 – 95%, non condensing
• Shock: IEC 60068-2-27 (25G and 50G)
• Vibration:IEC 60068-2-6 (sinus shaped), IEC 60068-2-64 (broadband noise)
• Weight:
  sensing head 40 g (1.4 oz)
  electronics 420 g (14.8 oz)

Electrical Specifications

• Output / analog: 0/4 – 20 mA, 0 – 5 / 10 V or thermocouple J, K
• Output / alarm: 24 V / 50 mA (open collector)
• Output / digital: 0/10 V (10 mA) optional: relay: 2 x 60 V DC/42 V AC; 0.4 A; optically isolated
• Digital interface (optional): USB, RS232 or RS485 , Modbus RTU, Profibus DP, Ethernet
• Output impedances:
  mA max. 500 Ω (with 8-36 V DC)
  mV min. 100 kΩ load impedance
  thermocouple 20 Ω
• Inputs: programmable functional input for external emissivity setting /ambient temperature compensation, trigger (reset of hold functions)
• Cable length: 1 m (standard), 3 m, 8 m, 15 m (3.3 ft (standard), 9.8 ft, 26.2ft, 49.2ft)
• Power supply: 8-36 V DC
• Current draw: max. 100 mA

Versions

Part number: temperature range / spectral range / optics / max. ambient temperature / cable length / response time

• OPTCTLT15F: -50 … 975°C (-58 … 1781 °F) / 8-14 μm / 15:1 / 120°C (248 °F) / 1 m (3.3 ft) cable / 9 ms
• OPTCTLT25F: 50 … 975°C (-58 … 1781 °F) / 8-14 μm / 25:1 / 120°C (248 °F) / 1 m (3.3 ft) cable / 6 ms

¹⁾ whichever is greater with dynamic noise compression
²⁾ at object temperatures ≥ 20°C (77 °F)
³⁾ at time constant 100 ms with smart averaging and T_obj 25°C (77 °F)
⁴⁾ with dynamic adaption at low signal levels

Areas of application for the pyrometer optris CTfast LT

The CTfast temperature sensor is ideally suited for temperature measurements of especially quick processes, e.g. the production of glass syringes during which the adherence process between the needle and the syringe can be optimally monitored and controlled.

The IR thermometer CTfast is also employed in the production of PET bottles, since during the compression of PET preforms, a certain temperature needs to be adhered to for ensuring the success of the process. The CTfast LT is a reliable assistant for this surveillance task requiring a punctiform measurement.

In the paper industry the device is employed as well, e.g. in printing machines for measurements of operating and paper temperatures

Infrared software optris Compact Connect included

The temperature analysis software optris Compact Connect has been developed specifically for the extensive documentation and analysis of temperature measurement data of our stationary infrared thermometers. It is license-free and included in every pyrometer shipment.