Heartbeat Technology; Environment; Ambient Temperature Range - Endress+Hauser Liquiphant FTL51B Operating Instructions Manual

Technical data
56
15.2.9

Heartbeat Technology

Heartbeat Technology module
The software package consists of 3 modules. These three modules combined check,
evaluate and monitor device functionality and process conditions.
• Heartbeat Diagnostics
• Heartbeat Verification
• Heartbeat Monitoring
15.3

Environment

15.3.1

Ambient temperature range

The following values apply up to a process temperature of +90 °C (+194). At higher
process temperatures, the permitted ambient temperature is reduced (see diagram).
• Without LCD display: –40 to +70 °C (–40 to +158)
• With LCD display: –40 to +70 °C (–40 to +158) with limitations in optical properties,
such as display speed and contrast
Can be used without limitations: –20 to +60 °C (–4 to +140 °F)
Optionally available:
• –50 °C (–58 °F) with restricted operating life and performance
• –60 °C (–76 °F) with restricted operating life and performance,
Below –50 °C (–58 °F): devices can be permanently damaged
[°F]
158
T a
122
32
T p
-40
-76
 34 Permitted ambient temperature T
The following ambient temperature applies over the entire process temperature range for
devices with a temperature spacer: +70 °C (+158 °F)
Outdoor operation in strong sunlight:
• Mount the device in a shaded location
• Avoid direct sunlight, particularly in warmer climatic regions
• Use a weather protection cover, can be ordered as an accessory
Hazardous area
In the hazardous area, the permitted ambient temperature can be limited depending on
the zones and gas groups. Pay attention to the information in the Ex documentation (XA).
T a
T a
[°C]
70
50
0
-40
-60
-50 0
-58 32
at the housing as a function of the process temperature T
a
Liquiphant FTL51B HART
T p
+90 +150 [°C]
T p
[°F]
+194 +302
in the vessel
p
Endress+Hauser
A0045805