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Reference Manual
00809-0200-4101, Rev AA
July 2008
Rosemount 2051
A-8
Humidity Limits 0–100% relative humidity
Volumetric Displacement Less than 0.005 in
3
(0,08 cm
3
)
Damping Analog output response to a step input change is user-selectable from 0 to
25.6 seconds for one time constant. This software damping is in addition to
sensor module response time.
Failure Mode Alarm If self-diagnostics detect a sensor or microprocessor failure, the analog signal
is driven either high or low to alert the user. High or low failure mode is
user-selectable with a jumper on the transmitter. The values to which the
transmitter drives its output in failure mode depend on whether it is
factory-configured to standard or NAMUR-compliant operation. The values for
each are as follows:
Output Code F
If self-diagnostics detect a gross transmitter failure, that information gets
passed as a status along with the process variable.
Inert Fill Sensor
(1)
0 to 185 °F (–18 to 85 °C)
(2)
2051L High-Side Temperature Limits (Process Fill Fluid)
Syltherm
®
XLT –100 to 300 °F (–73 to 149 °C)
D.C. Silicone 704
®
32 to 400 °F (0 to 205 °C)
D.C. Silicone 200 –40 to 400 °F (–40 to 205 °C)
Inert –50 to 350 °F (–45 to 177 °C)
Glycerin and Water 0 to 200 °F (–18 to 93 °C)
Neobee M-20
®
0 to 400 °F (–18 to 205 °C)
Propylene Glycol and
Water
0 to 200 °F (–18 to 93 °C)
(1) Process temperatures above 185 °F (85 °C) require derating
the ambient limits by a 1.5:1 ratio.
(2) 220 °F (104 °C) limit in vacuum service; 130 °F (54 °C) for
pressures below 0.5 psia.
(3) 160 °F (71 °C) limit in vacuum service.
Table A-3. 2051 Process Temperature Limits
Standard Operation
Output Code Linear Output Fail High Fail Low
A3.9 ≤ I ≤ 20.8 I ≥ 21.75 mA I ≤ 3.75 mA
M 0.97 ≤ V ≤ 5.2 V ≥ 5.4 V V ≤ 0.95V
NAMUR-Compliant Operation
Output Code Linear Output Fail High Fail Low
A3.8 ≤ I ≤ 20.5 I ≥ 22.5 mA I ≤ 3.6 mA