Siemens HydroRanger 200 Instruction Manual Page 227

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7ML19981FC01 HydroRanger 200 – INSTRUCTION MANUAL Page 213
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Appendix B: Tech Reference
Dolphin Plus Display
Distance Calculation
To calculate the transducer to material level (object) distance, the transmission medium
(atmosphere) sound velocity (P653) is multiplied by the acoustic transmission to reception
time period. This result is divided by 2 to calculate the one way distance.
Distance = Sound Velocity x Time / 2
The Reading displayed is the result of performing any additional modification to the
calculated distance (as determined by Operation P001, Units P005, Volume Conversion,
P050 to P054, Reading, P060 to P063, OCM, P600 to P611, and/or Totalizer P622 to P633
parameters).
Sound Velocity
The sound velocity of the transmission medium is affected by the type, temperature, and
vapor pressure of the gas or vapor present. As preset, the HydroRanger 200 assumes the
vessel atmosphere is air at 20°C (68°F). Unless altered, the sound velocity used for the
distance calculation is 344.1 m / s (1129 ft / s).
Variable air temperature is automatically compensated when a Siemens Milltronics
ultrasonic / temperature transducer is used. If the transducer is exposed to direct
sunlight, use a sunshield or a separate TS-3 temperature sensor.
Also, if the temperature varies between the transducer face and the liquid monitored, use
a TS-3 temperature sensor (submerged in the liquid) in combination with an ultrasonic /
temperature transducer. Set Temp Source (P660) for both, to average the transducer and
TS-3 measurements.
Atmosphere composition other than air can pose a challenge for ultrasonic level
measurement. However, excellent results may be obtained by performing a Sound
Velocity Calibration (P651) if the atmosphere is homogeneous (well mixed), at a fixed
temperature, and under consistent vapor pressure.
Cursor
Echo Marker
TVT Curve
Echo Profile
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