Description
Theory of Operation for Ratio (2-Color) Sensors
3
2. Description
These Endurance series pyrometers with an integrated sensor head are infrared noncontact
temperature measurement systems. Such devices have an adjustable focus, a through-the-
lens sighting capability, and a parallax-free optical axis. They are energy transducers, designed
to measure accurately and repeatedly the amount of heat energy emitted from an object, and
then convert that energy into a measurable electrical signal. Each model operates as an
integrated temperature measurement subsystem consisting of optical elements, spectral filters,
detectors, digital electronics and an IP65 (NEMA-4) rated housing. Each is built to operate on
a 100 percent duty cycle in industrial environments. Various output types are offered for easy
integration into industrial monitoring and control environments.
Endurance series pyrometers are available for different kind of temperature measurement
applications and are separated into the following variants:
Table 2: Integrated sensor head models and their assigned sensor spectral range
E1ML, E1MH
-Monochrome (1-Color)-
1C-sensor in spectral range of 1.0 µm for different
temperature ranges
E2ML, E2MM, E2MH
-Monochrome (1-Color)-
1-C-sensor in spectral range of 1.6 µm for different
temperature ranges
E3ML, E3MH
-Monochrome (1-Color)-
1-C-sensor in spectral range of 2.4 µm for different
temperature ranges
E1RL, E1RH
-Ratio (2-Color)-
2-C-sensor in spectral range of 1.0 µm (nominal) for
different temperature ranges
2-Color-sensor in spectral range of 1.6 µm (nominal)
for different temperature ranges
Monochrome (1-Color mode) types for standard temperature measurement applications
The 1-Color mode is best for measuring the temperature of targets in areas where no sighting
obstructions, either solid or gaseous, exist. Such 1-Color mode is also best where the target
completely fills the measurement spot.
Ratio (2-Color mode) types for specific temperature measurement applications
Such pyrometers determine the object temperature by the ratio of two separate and overlapping
infrared bands. The 2-Color mode is best for measuring the temperature of targets that are
partially obscured, either intermittently or permanently by other objects, openings, screens, or
viewing windows that reduce energy, and by dirt, smoke, or steam in the atmosphere. The 2-
Color mode can also be used on targets that do not completely fill the measurement spot,
provided the background is much cooler than the target. Ratio pyrometer types are able to
measure and determine the object temperature in either one of both modes (1-Color / 2-Color),
in which always 2 infrared sensors are active.
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