Technical Details of the optris CT 3M

Measurement Specifications

• Temperature ranges¹⁾ (scalable via programming keys or software):
  50°C … 400°C (3ML)
  100°C … 600°C (3MH)
  150°C … 1000°C (3MH1)
  200°C … 1500°C (3MH2)
  250°C … 1800°C (3MH3)
• Spectral range: 2.3 µm
• Optical resolution (90% energy):
  22:1 (3ML)
  33:1 (3MH)
  75:1 (3MH1-H3)
• System accuracy²⁾ (at ambient temperature 23 ± 5°C): ± (0.3% of reading + 1°C)
  
• Repeatability (at ambient temperature 23 ± 5°C): ± (0.1% of reading + 1°C)
  
• Temperature resolution (display): 0.1 K
• Exposure time³⁾: 1 ms (90%)
• Emissivity / Gain (adjustable via programming keys or software): 0.100 – 1.100
• Transmissivity / Gain (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 … 85°C
  electronics: 0°C … 85°C
• Storage temperature:
  sensing head: -40°C … 125°C
  electronics: -40°C … 85°C
• Relative humidity: 10 – 95%, non condensing
• Vibration:IEC 60068-2-6 (sinus shaped), IEC 60068-2-64 (broadband noise)
• Shock: IEC 60068-2-27 (25G and 50G)
• Weight:
  sensing head 40 g
  electronics 420 g

Electrical Specifications

• Output / analog: 0/4 – 20 mA, 0-5/10 V, thermocouple J, K, alarm
• Output / alarm: 24 V / 50 mA (open collector)
• Optional: relay: 2 x 60 V DC/42 V AC_eff; 0.4 A; optically isolated
• Output / digital (optional): USB, RS232, RS485 (optional), 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: 3 m
• Power supply: 8-36 V DC
• Current draw: max. 100 mA

Versions

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

• OPTCT3ML: 50-400°C / 2.3 μm / 22:1 / 85°C / 3 m cable
• OPTCT3MH: 100-600°C / 2.3 μm / 33:1 / 85°C / 3 m cable
• OPTCT3MH1: 150-1000°C / 2.3 μm / 75:1 / 85°C / 3 m cable
• OPTCT3MH2: 200-1500°C / 2.3 μm / 75:1 / 85°C / 3 m cable
• OPTCT3MH3: 250-1800°C / 2.3 μm / 75:1 / 85°C / 3 m cable

¹⁾ T_object > T_{sensing head} + 25°C
²⁾ ε = 1, response time 1 s
³⁾ with dynamic adaptation at low signal levels

Areas of application for the pyrometer optris CT 3M

The IR thermometer optris CT 3M has a measuring wavelength of 2.3 µm and is thus employed in temperature measurements of metallic surfaces and composite materials in processing. Especially its low temperature range from 50°C on make the temperature sensor a popular measuring device for every kind of low-temperature measurement of metals.

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.