Honeywell RM640, Handbook

Page: 27 / 184

INSTALLATION
3
27
RM640
www.honeywellprocess.com 34-VF-25-131 iss.1 GLO Feb 2019 US
3.5 Pressure and temperature ranges
Maximum process connection temperature and operating pressure
For more data on pressure ratings, refer to
Guidelines for maximum operating pressure
on page
139.
3.6 Recommended mounting position
We recommend that you prepare the installation when the tank is empty.
WARNING!
The process connection temperature range must agree with the temperature limits of the
gasket material. The operating pressure range is subject to the process connection used and the
flange temperature.
Figure 3-3: Pressure and temperature ranges
1
Temperature at the process connection
Non-Ex devices: The temperature range depends on the type of antenna, process connection and the seal material.
Refer to the table that follows.
Devices with Hazardous Location approvals: see supplementary instructions
2
Ambient temperature for operation of the display
-20...+70
° C / -4...+158 ° F
If the ambient temperature is not between these limits, then it is possible that the display screen will not operate tem-
porarily. The device continues to measure level and send an output signal.
3
Ambient temperature
Non-Ex devices: -40...+80
° C / -40...+176 ° F
Devices with Hazardous Location approvals: see supplementary instructions
4
Process pressure
Depends on the type of antenna and process connection. Refer to the table that follows.
Antenna type Maximum process connection
temperature
Maximum operating pressure
[ ° C] [ ° F] [barg] [psig]
PP Drop +100 +212 16 232
PTFE Drop +130 +266 16 232
Metallic Horn +130
1
+266
1
16 232
1
The maximum process connection temperature must agree with the temperature limits of the gasket material
CAUTION!
Follow these recommendations to make sure that the device measures correctly. They have an
effect on the performance of the device.