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1.12.3 Technical data
Table 1-1: Maximum Temperatures (Ex Approvals)
Maximum am-
bient air tempera-
ture (T
158 °F (70 °C)
140 °F (60 °C)
(1)
When using the standard housing.
(2)
When using D- or DE-type housings.
(3)
The maximum surface temperature is the same as the maximum process
temperature.
(4)
Only for Remote Housing version of the Rosemount 2555.
Permitted ambient temperature at the electronics enclosure:
•
-40 ≤ T
•
-40 ≤ T
The maximum surface temperature is limited to 248 °F (120 °C) by an
internal thermal fuse
Permitted temperature at sensor extension, process connection:
•
-40 to 464 °F/240 °C
(when Probe Thermal Profile code S, M, R or P is selected)
•
-40 to 833 °F/445 °C
(when Probe Thermal Profile code E or V is selected)
(1)
Thermal fuses are circuit breakers in temperature sensing devices to cutoff the circuit
by detecting overheat caused from fire, short circuit, or abnormal electronic
operation. Thermal fuses are not reusable once they are used.
16
Maximum process
temperature (T
)
a
(1)
≤248 °F (120 °C)
(2)
≤266 °F (130 °C)
≤383 °F (195 °C)
≤464 °F (240 °C)
≤563 °F (295 °C)
≤883 °F (445 °C)
≤ +158 °F / +70 °C for the standard housing.
a
≤ +140 °F / +60 °C for the D- and DE-type housings.
a
(1)
.
Maximum surface
)
temperature (T)
p
248 °F (120 °C)
(3)
(3)
(3)
(4)
(3)
(4)
(3)
Noviembre de 2020
Temperature class
T4
T4
T3
T2
T2
T1
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