PyroEpsilon Fixed Infrared Temperature Sensor with Adjustable Emissivi – IOThrifty

Free Shipping! - USA Orders Over $75, Canada Orders Over $125

Sensor shown with optional PyroTune emissivity adjuster
Sensor shown with optional PyroTune emissivity adjuster

PyroEpsilon Fixed Infrared Temperature Sensor with Adjustable Emissivity

Regular price $188.00 Sale SKU:IR-CA-PE21LT
Ships in 2-3 weeks

  • Temperature Ranges From -20°c To 500°c
  • Two-wire 4-20 Ma Output
  • Adjustable Emissivity Via Continuously Variable 4-20 Ma Input - Measure A Wide Range Of Target Materials
  • Choice Of Precision Optics For Large Or Small Targets
  • Fast Response With High Stability
  • Stainless Steel Housing, Sealed To IP65
  • Quick And Easy Installation
  • Wide Range Of Accessories
  • Conforms To Industrial EMC Standard

The PyroEpsilon is a simple infrared temperature sensor with an adjustable emissivity setting. It is ideal if the target is partially reflective. The emissivity setting is adjustable via a two-wire 4-20 mA input, and can be adjusted continuously using a variable 4-20 mA source.To set the emissivity manually, the optional PyroTune emissivity adjuster is available. The sensor is also compatible with PLC outputs or indicating controllers that can provide a 4-20 mA signal. If no 4-20 mA input is provided, the emissivity setting will revert to 0.95, making the sensor suitable for measuring non-reflective non-metal materials (or painted metals) out of the box.


Air/Water Cooled Housing (Must be ordered with sensor)
The air/water cooled housing allows the sensor to withstand ambient temperatures above the normal 70°C limit. Depending on the degree of cooling required, air or water may be used as the cooling fluid. To prevent condensation forming on the lens, an air purge collar is included with this item.

The optional PyroTune emissivity adjuster provides a continuous 4-20 mA current signal to the PyroEpsilon sensor. Simple push-button controls allow the emissivity setting to be adjusted. The built-in LCD display shows the emissivity or mA value.  

Air Purge Collar
The air purge collar is used to keep dust, fumes, moisture and other contaminants away from the lens. Air flows into the fitting on the side and out of the aperture at the front.

Fixed Mounting Bracket
The L-shaped fixed mounting bracket offers a rigid support for the sensor and allows fine rotational adjustment about one axis.

Adjustable Mounting Bracket
The adjustable mounting bracket consists of a fixed mounting bracket plus another L-shaped bracket. When assembled as shown, the adjustable mounting bracket offers a rigid support for the sensor and allows fine two-axis adjustment.



Select from the drop down boxes on the top of the page
1) Field of View - choose from

  • 2:1 Divergent Optics
  • 15:1 Divergent Optics
  • 30:1 Divergent Optics
  • Close Focus:1 Divergent Optics

2 Temperature Range

  • -20°C to 100°C
  • 0°C to 250°C
  • 0°C to 500°C

3) Optional Cooling

  • Sensor without Cooling
  • Air/water cooled jacket with air purge collar


PyroEpsilon Data Sheet
PyroEpsilon User Manual


General Specifications
Output: 4-20 mA (two-wire, on power loop)
Accuracy: ± 1% of reading or ± 1°C whichever is greater
Repeatability: ± 0.5% of reading or ± 0.5°C whichever is greater
Emissivity Setting: Adjustable from 0.2 to 1.0 via 4-20 mA input
Response Time, t90: 240 ms (90% response)
Spectral Range: 8 to 14 μm
Supply Voltage: 24 V DC (28 V DC max.)
Min. Sensor Voltage: 6 V DC
Max. Loop Impedance: 900 Ω (4-20 mA output)
Input Impedance: 50 Ω

PyroTune Emissivity Adjuster Specifications
Output: 4-20 mA
Supply Voltage: 24 V DC (13 V to 28 V DC)
Display Format: 3.5 digit LCD
Display Units: Emissivity (0.2 to 1.0) or current (4 to 20 mA)
Adjustment: Push-buttons (raise/lower/set)
Construction: Polycarbonate with gasket, transparent lid (PC) and quick release screws
Mounting: Surface
Dimensions: 65(h) x 50(w) x 35(d) mm
Weight: 72 g
Environmental Rating: IP65
Ambient Temperature Range: 0°C to 70°C
Relative Humidity: 95% max. non-condensing

Field of View Diagrams
Please note: The given measured spot size contains 90% of the energy detected by the sensor. We normally recommend the target is at least twice as large as the given measured spot for maximum accuracy. Sensors may be used at longer distances than the above diagrams show. There is no maximum measurement distance in clean air; this is because the PyroEpsilon detects only the wavelengths of infrared radiation that are not absorbed by the atmosphere. 2:1 optics are not available on sensors with temperature range 0°C to 500°C as standard.

 PyroEpsilon 2:1 Field of View

PyroEpsilon 15:1 Field of ViewPyroEpsilon 30:1 Field of View

PyroEpsilon Close Focus Field of View