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2.2.5 Surface
2.2.6 Temperature
2.2.7 Waves
2.2.8 Wind
2.3 Installation Checklist
2.4 Connecting the Cable
2.4.1 Cable Connection:
Signature Flow Meter
TIENet™ 360 LaserFlow™ Velocity Sensor
Solids, foam, oil, and turbulence can all absorb or weaken the
ultrasonic and laser signals, causing errors in detection. Foam or
oil on the surface of the stream can also produce false level
readings.
Changes in ambient temperature significantly affect the velocity
of sound. If ambient temperature changes rapidly, there may be a
delay before the temperature sensor of the ultrasonic transducer
can activate temperature compensation.
Note
If the sensor will be installed outdoors in direct sunlight, use a
sunshade to prevent heating of the sensor housing.
Waves on the surface of the flow stream can deflect the ultrasonic
signal, causing erroneous readings or total loss of signal. The
flow meter software rejects occasional readings that deviate sub-
stantially from normal.
Strong winds can significantly reduce the strength of the ultra-
sonic return echo. Narrow beams can result in the sound being
blown away; likewise, greater distances to the flow stream
surface are more subject to distortion in strong winds.
Prior to installing the system, ensure that you have all supplies
and site information readily available.
To assist you in this preparation, this manual includes the
Installation Checklist, page B-1. Teledyne Isco recommends that
you print this appendix and fill in the relevant information.
The LaserFlow cable will have one of two different connector
t y p e s : U n t e r m i n a t e d f o r t h e S i g n a t u r e ® F l o w M e t e r
(Section 2.4.1), and TIENet plug for the 2160 LaserFlow Module
(Section 2.4.3).
Distance can be increased by installing the TIENet Expansion
Box closer to the installed sensor and adding a custom-length
TIENet cable between the box and the Signature® flow meter.
The maximum recommended distance between the LaserFlow
and the Signature® flow meter is 45.7 meters (150 feet). The
maximum recommended distance between the LaserFlow and
the 2160 LaserFlow module is 23 meters (75.5 feet).
External TIENet devices such as the LaserFlow sensor are con-
nected to the Signature flow meter in the same manner, usually
using conduit or cord-grip cable fittings. Multiple external
TIENet devices can be connected simultaneously.
Refer to the Signature flow meter manual for instructions on
accessing the instrument's interior components.
Section 2 Preparation and Installation
2-3
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