IRt/c.20A Base Model

Product Overview

IRt/c.20A Base Model

• Infrared Thermocouple IRt/c 

• Non-contact

• Self Powered 

• Intrinsically Safe 

• Repeatability 0.02°F (0.01°C) 

• Interchangeability ±1% 

• Resolution approx. 0.0001°C 

• 20:1 Field of View

Technical Data

Target Surface Type
Hi E (non-metal)
Sensing Range
500 to 3000°F (260 to 1650°C)
Target Surface Type
Hi E (non-metal)
Lo E (metal)
Sensing Range
500 to 3000°F (260 to 1650°C)
1000 to 3500°F (540 to 1930°C)
Optimum Range Selections
One model each J, K: adjustable over entire sensing range, output tables available
Minimum Spot Size at dist.
(with supplied apertures)

No Aperture: 0.8” (20 mm) at <16” (400 mm) 

½” Aperture: 0.5” (13 mm) at <9” (230 mm) 

¼” Aperture: 0.25” (6 mm) at<3.5” (90 mm)

Minimum Spot Size
Field-of-View at > min. spot
20:1 (3°) approximately
Spectral Response
2 to 20 μ
Output Impedance
6 to 13 Kohms approx
Spectral Response
2 to 20 μ
0.1 to 5 μ
Output Impedance
6 to 13 Kohms approx
9 to 18 Kohms approx
Output Impedance
Twisted shielded pair of base thermocouple material (J,K,etc.), 3 ft (.9 m) std length, Teflon sheathed, rated to 392°F (200°C) continuous service.
4.15” x 1.375” Dia. (105 x 35 mm)
8.7 oz (248 g) with cable
Stainless steel, hermetically sealed, exceeds NEMA 4,4x; IP65,67, intrinsically safe, cable shield grounded to housing and electrically isolated fromsignal
Air Purge
Built-in; cooling capacity to 400°F (200°C) ambient; 3’ (0.9 m) polyurethane tubing provided

Set-up and calibration instructions

For all IRt/c Models with “A” in model designation (IRt/c.xxxA)

1. Connect air purge first if installing in process already at operating temperature.   Provide minimum 5 psig (30 kPa) air pressure.
2. Install IRt/c and align to view the desired target. Bring target to operating temperature if not already there. Connect leads to readout device to be used (controller, PLC, etc.).
3. If the target temperature is not known, measure the target temperature with an accurate reference. Remove the setscrew to expose the calibration screw. Adjust the calibration screw to obtain reading desired. Replace the setscrew cover when complete. For final process adjustments, the ZERO or OFFSET adjustments available on readout devices can be conveniently used.
• Installation and calibration complete.
• To maximize the linear range, see Tech Note #70.
• Calibration screw operates like a radio volume control: clockwise increases signal.
Download this Data Sheet as PDF