Siemens SITRANS FUH1010, Product Instruction Manual, Page: 53 / 264

Connecting
5.6 Sensor Installation
FUH1010 IP65 NEMA 4X Precision Volume
52
Operating Instructions, 01/2013, A5E32122003-AA
Direct mount provides a shorter sonic beam path. This usually improves signal with sonically
attenuative liquids or pipe materials. Direct mount is recommended for plastic pipes.
Compared to Direct mounting, Reflect mount requires almost double the amount of mounting
length. Therefore, direct mount may be the only option if the availability of mounting space is
limited.
Reflect mount is recommended whenever possible because it is the simplest way to mount
the sensors.
Ltn Menu Cell
The Ltn menu cell is a view only menu cell that shows the distance in inches or millimeters
between the front faces of the sensors along the axis of the pipe. If you are mounting the
sensors without a track or spacer bar, you have to space them according to this value. Note
that Ltn may be a negative number for direct mount on very small pipes where the sensor
spacing overlaps.
5.6.2 Sensor Identification and Selection
Sensor identification
The sensor part number located on the front face provides a detailed identification. For
example, the Part Number: 1011HNS-D1T1-S2 means:
'+ 87 + 6 6 1)
① ⑤
Model Size
②
Hi Precision
⑥
Temperature
③
NEMA w/F-Conn
⑦
Agency Approved
④
Pipe Material
Note
Check to make sure that the sensors are a matched set with the same serial numbers and
marked with an "A" and "B" (e.g., 19256A and 19256B).
Note
Sensor Model names for Version 3 op systems are as follows: 1011H Hi Precision, 1011
Universal and 991 Universal