Optris CT LT Infrared Thermometer
Starting at $295.00


CT Series

Some models in stock. View available part numbers.

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  • -58 to 1787°F (-50 to 975°C) temperature range
  • Universal analog output
  • ±1% accuracy
  • 8 - 14μm spectral range
  • 150ms response time
  • 2:1, 15:1, 22:1 optics available
  • Available in 1, 3, 8 or 15m cable lengths
  • 8-36VDC power supply
  • 100mA max current draw
  • IP65 NEMA-4 rated

What's in the Box

  • Mounting nut
  • Electronic box with LCD display
  • Programming keys
  • Manual

The Optris CT LT infrared thermometer has one of the smallest infrared sensors available, and an optical resolution of 2:1, 15:1, or 22:1. Close focus optics can be pre-installed as either 0.6mm at 10mm (LT22) and 0.8mm at 10mm (LT15). The CT LT can function in ambient temperatures up to 356°F (180°C) without additional cooling.

Selectable analog outputs and multiple digital interfaces offer high variability. Field selectable analog output options include: 0/4-20mA, 0-5 and 0-10 V, and type K or J thermocouples. The Optris CT LT includes a programmable functional input for setting external emissivity, ambient temperature compensation, and reset of hold functions. It also features peak hold, valley hold, average, and an extended hold function with threshold and hysteresis. USB, RS485, RS232 interface, 2 optically isolated relay outputs, CAN-Bus, Profibus DP, and Ethernet available with plug in options.

The Optris Compact Connect temperature analysis software is available as a free download, and is necessary to document and analyze temperature measurement data. It is compatible with all netbooks, notebooks, and PC systems via Windows XP, Windows Vista, Windows 7 and 8.


Optris Compact Connect Software
Temperature analysis software for simple and fast parameterization of compact and high performance fixed IR thermometers


Please consider these optional accessories.

Optris ACCTCF CF Lens
For LT series, available with external thread M12 x 1
Optris ACCTPW Protective Window
For LT series, same mechanical size as CF lens, available with external thread M12x1
Optris ACC Air Purge Collar
Available for optics ≥10:1, ≤2:1, laminar & laminar with integrated CF-lens
Optris ACCTKF40GE K40 Flange
Vacuum protective Germanium (Ge) window, rated up to 10^-7mbar​ pressure, 1.44 stainless steel with acid resistance
Optris ACCTMB Mounting Bolt
M12 x 1 thread, adjustable in one axis
Optris ACCTMG Mounting Fork
M12 x 1 thread, adjustable in two axes, compatible with CT / CS ACCTFB fixed single axis mounting bracket
Optris CT / CS Mounting Bracket
Available as 1 or 2 axis & double hole M12, designed for 12mm sensing heads
In Stock
Optris ACCTRAM Right Angle Mirror
Enables measurements with 90° angle to sensor axis, for sensing heads with optical resolution ≥10:1
Optris CT Laser Sighting Tool
For aligning CT sensing heads, hardwired to CT electronics or battery powered options, available with 1, 3 or 8m connection cable
Optris Sighting Tube
M12x1 external thread, available in 20, 40 & 88mm length
Optris ACCTRAIL Rail Mount Adapter
Mounts CT electronics on a DIN rail
Optris CT / CSmicro Massive Housing
Stabilizes measurements in applications with significant & short-term variations in ambient temperatures
Optris ACCTCERT Calibration Certificate
For the CT LT infrared thermometer, at Tamb 166 & 500°C
Optris CT Series Digital Interface
Relay, RS485, RS232, USB, RS485/422, CAN-Bus & Profibus-DPv1 interfaces
In Stock
Optris ACCTAPMH Air Purge Collar
For massive housing, M18x1 thread
Optris ACCTEX Hazardous Location Kit
Preassembled Ex-box for use with CT infrared thermometers in hazardous locations
Optris ACCTFBMH Mounting Bracket
Single axis mounting massive housing bracket designed to be used with 18mm (M18) massive housing diameter
Optris ACCTTAM25 Thread Adapter
M12x1 to M25x1.5 thread adapter includes 2 mounting nuts
Part Number Price Available
Show Configuration
Base Price
-50 to 600°C, 15:1, 180°C max ambient temperature (+$65.00)
Cable length
$360.00 4
Show Configuration
Base Price
-50 to 975°C, 22:1, 180°C max ambient temperature (+$85.00)
Cable length
$380.00 3
Show Configuration
Base Price
-50 to 600°C, 15:1, 180°C max ambient temperature (+$65.00)
Cable length
8m (+$68.00)
$428.00 2

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Other part numbers are available to order but are not currently in stock. Current availability for non-stock parts is "Usually ships in 3-5 business days". Click here to select options