|Field of View
||-20°C to 100°C
||0°C to 250°C
||0°C to 500°C
|Ø 5 mm @ 100 mm
For sensors with 2:1 optics and 0°C to 500°C temperature range, contact Calex.
4-20 mA (two-wire, on power loop)
± 1% of reading or ± 1°C whichever is greater
± 0.5% of reading or ± 0.5°C whichever is greater
Adjustable from 0.2 to 1.0 via 4-20 mA input
Response Time, t90
240 ms (90% response)
24 V DC (28 V DC max.)
Min. Sensor Voltage
6 V DC
Max. Loop Impedance
900 Ω (4-20 mA output)
PyroTune Emissivity Adjuster Specifications
24 V DC (13 V to 28 V DC)
3.5 digit LCD
Emissivity (0.2 to 1.0) or current (4 to 20 mA)
Polycarbonate with gasket, transparent lid (PC) and quick release screws
65(h) x 50(w) x 35(d) mm
Ambient Temperature Range
0°C to 70°C
95% max. non-condensing
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 Calex sensors detect 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. Please contact Calex for more information.
Diameter 18 mm diameter x length 103 mm
M16 x 1 mm pitch
1 m (longer lengths available to order)
|Ambient Temperature Range
||0°C to 70°C
||95% max. non-condensing
Electromagnetic Compatibility Standards
Conforms with EN61326-1, EN61326-2-3 (Electrical Equipment for Measurement, Control and Laboratory Use – EMC Requirements – Industrial)
The emissivity setting of the PyroEpsilon infrared temperature sensor is adjustable via an analogue input, so it can be controlled automatically during the process, for example by a PLC, or manually, by using the controls on the PPT245 indicating controller or PyroTune emissivity adjuster. If the emissivity of the target changes during the process, then the PyroEpsilon is ideal.
The PyroEpsilon is also a good choice if a simple pyrometer with a 4-20 mA output is required, but you are not sure if the emissivity of the target surface is high enough for a fixed-emissivity sensor to be suitable. When no 4-20 mA input signal is present, the emissivity setting will default to 0.95. Emissivity adjustment may then be added later on if required.
The PyroEpsilon may be used in many applications, including the following:
Measurement of the temperature of food production equipment including bakery trays and plastic moulds. Surface temperature of PTFE coated rollers.
Paper and Packaging
Glossy or shiny paper temperature
Thermoforming temperatures, temperature of plastic bottle parison tubes before inflation in blow moulding
Measuring the temperature of painted surfaces in switchgear cabinets, generator housings
Measurement of pipe temperature during coating where the emissivity of the surface increases during the process
e.g. painted bearing housings, driveshafts, rollers and gearboxes. Turbine housing temperature measurement. Monitoring the outer surface temperature of boilers and pipes
The sensor is supplied with a cable length of 1 m as standard. Longer lengths are available to order; please contact Calex for more information.
Connecting the PyroEpsilon:
1. Connect only the power wires PWR+ and PWR- to a 24 V DC powered 4-20 mA measurement loop. Connect the emissivity input wires IP+ and IP- to each other, and do not connect them to the power supply.
2. Obtain a temperature reading without emissivity adjustment.
3. Connect IP+ and IP- to a 4-20 mA current source if emissivity adjustment is required.