Flow Tube Mounting Location - Siemens SITRANS FUS1020 Manual

Section 4
4.1.2 SELECTING THE RIGHT FLOW TUBE
Select the appropriate body material: Consider liquid compatibility, operating temperature, and pres-
sure. These must never exceed the rating of the flow tube. Consult installation drawings to determine
appropriate fittings for coupling the flow tube into your piping.
Select the appropriate size: Try to match as closely as possible the diameters of the pipe and the
flow tube. This will reduce or eliminate the potential for a noticeable pressure drop. In addition, the
operating flow range must fall within the indicated specifications.
Material
CPVC
Kynar PVDF
Teflon PFA
316 SS (size 1)
316 SS (size 2)
* Maximum specifications may be reduced depending on the liquid and operating temperature.

4.1.3 FLOW TUBE MOUNTING LOCATION

Consider the following guidelines when choosing a Flow Tube mounting location.
a. The flow tube must be mounted horizontally, with its inlet and outlet facing upward. This minimizes
the possibility of trapped air bubbles that could interfere with transducer signals.
b. For the best flow profile, locate the flow tube downstream from the center of the longest available
straight run. Make sure to locate the inlet upstream relative to the outlet.
c. DO NOT select a location immediately downstream from:
• A throttling valve or other source of cavitation.
• A mixing tank or other device that could aerate the liquid.
• The discharge of a positive displacement pump.
Flow Tube Pressure and Temperature Ratings
Temperature Range
0°F to 200°F (-15°C to 90°C)
0°F to 275°F (-15°C to 135°C)
0°F to 250°F (-15°C to 120°C)
-40°F to 400°F (-40°C to 204°C)
-40°F to 400°F (-40°C to 204°C)
Flow Tube Material, Size & Flow Range Ratings
Material Size
CPVC 1
CPVC 2
PVDF 1
PVDF 2
PFA 1
PFA 2
316 SS 1
316 SS 2
Flow Range
0 to 5 GPM (0 to 20 LPM)
0 to 25 GPM (0 to 95 LPM)
0 to 5 GPM (0 to 20 LPM)
0 to 25 GPM (0 to 95 LPM)
0 to 5 GPM (0 to 20 LPM)
0 to 16 GPM (0 to 60 LPM)
0 to 10 GPM (0 to 40 LPM)
0 to 30 GPM (0 to 115 LPM)
4-2
1020NFM-1D
Max. Pressure
150 psig (10.3 bar)*
150 psig (10.3 bar)*
100 psig (7.0 bar)*
5200 psig (350 bar)*
4200 psig (240 bar)*