Calex PyroEpsilon Series, Operator'S Manual, Page: 2 / 31

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PyroEpsilon non-contact infrared sensors measure temperatures from -20°C to 500°C and
provide a linear 4 to 20mA output. This output signal is compatible with almost any indicator,
controller, recorder, data logger etc., without the need for special interfacing or signal
conditioning.
The sensor’s emissivity setting can be adjusted from 0.2 to 1.0 to cope with different target
materials and is controlled by a 4-20 mA input. This gives the opportunity to adjust the
emissivity setting automatically from a programmable logic controller (PLC). Alternatively the
emissivity setting can be adjusted manually using the optional PyroTune module. If the 4-20
mA input is left open or short-circuit, the emissivity setting defaults to 0.95.
PYROEPSILON SPECIFICATIONS
Model Numbers
Field of View -20ºC to 100ºC 0ºC to 250ºC 0ºC to 500ºC
2:1 PE21LT PE21MT PE21HT
15:1 PE151LT PE151MT PE151HT
30:1 PE301LT PE301MT PE301HT
ø5mm @ 100mm PECFLT PECFMT PECFHT
Output 4-20 mA
Accuracy ±1% of reading or ±1ºC whichever is greater
Repeatability ± 0.5% of reading or ± 0.5ºC whichever is greater
Emissivity 0.2 to 1.0 via 4-20 mA input
Response Time 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
Construction Stainless Steel
Dimensions 18 mm diameter x 103 mm long
Thread Mounting M16 x 1 mm pitch
Cable Length 1 m
Weight with Cable 95 g
Environmental Rating IP65
Ambient Temperature Range 0ºC to 70ºC
Relative Humidity 95% max. non-condensing
PYROTUNE 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 - 20 mA)
Adjustment Push-buttons (raise/lower/set)
Construction Polycarbonate with gasket, transparent lid (PC) and quick
release screws
Mounting Surface
Dimensions 65 mm tall x 50 mm wide x 35 mm deep
Weight 72 g
Environmental Rating IP65
Ambient Temperature Range 0ºC to 70ºC
Relative Humidity 95% max. non-condensing
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