Technical Data
Marathon MR Rev. E2 04/2011 11
3
3.1 Measurement Specifications
Temperature Range
MR1SA 600 to 1400°C (1112°F to 2552°F)
MR1SB 700 to 1800°C (1292°F to 3272°F)
MR1SC 1000 to 3000°C (1832°F to 5432°F)
Spectral Nominal Response 1.0 µm nominal (Si/Si layered detector)
Spectral Band Response
1-color band 0.75 to 1.1 μm
2-color band 0.75 to 1.1 μm, 0.95 to 1.1 μm
System Accuracy ±(0.5% Tmeas + 2°C), Tmeas in °C
with no attenuation
Repeatability ±0.3% full scale
Temperature Resolution ±1°C (±2°F) for display and RS485 interface
Analog Output Resolution
MR1SA, MR1SB 1°C or 1°F
MR1SC 1°C or 2°F
Response Time (95% Response) all models 10 ms for signal to reach 95% of final temperature
Temperature Coefficient All models 0.03% full scale change per 1°C change in ambient
temperature
Emissivity (1-color) 0.10 to 1.00, digitally adjustable in increments of 0.01
Slope (2-color) 0.850 to 1.150, digitally adjustable in increments of 0.001
Signal Processing Peak hold, averaging
Noise Equivalent Temperature all models 1°C peak to peak, target emissivity of 1.00,
(NET) unobscured target
3°C peak to peak, for all specified attenuation conditions
Peak Hold Range 0.1 to 299.9 s (300 s = )
Averaging Range 0.1 to 299.9 s (300 s = )
Warm Up Period 15 minutes
Figure 1, Figure 2, and Figure 3 show each sensor model’s percentage of allowed signal reduction at
all temperatures. Refer to these graphs to estimate what percentage of target area must be visible to
the sensor at temperatures below the minimum temperature (95% attenuation) as shown in Table 1.
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