Siemens HydroRanger 200 Instruction Manual download pdf (Page 228)

Page 214 HydroRanger 200 – INSTRUCTION MANUAL 7ML19981FC01

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Appendix B: Tech Reference

The HydroRanger 200 automatic temperature compensation is based on the sound

velocity / temperature characteristics of “air” and may not be suitable for the atmosphere

present. If the atmosphere temperature is variable, perform frequent Sound Velocity

Calibrations to optimize measurement accuracy.

Sound Velocity calibration frequency may be determined with experience. If the sound

velocity in two or more vessels is always similar, future calibrations may be performed on

one vessel and the resultant Velocity (P653) entered directly for the other vessel(s).

If the sound velocity of a vessel atmosphere is found to be repeatable at specific

temperatures, a chart or curve may be developed. Then, rather than performing a Sound

Velocity Calibration each time the vessel temperature changes significantly, the

anticipated Velocity (P653) may be entered directly.

Scanning

When echo processing is complete, (if more than 1 vessel is monitored) the scanning

relay changes state to supply the transmit pulse to the other transducer after the Scan

Delay (P727).

Scan Delay is automatically set by Maximum Process Speed (P003). When high speed

scanning is required (sometimes the case for equipment position monitoring), the Scan

Delay may be reduced. Reduce the Scan Delay only as required, otherwise premature

scanning relay fatigue could occur.

When a single point HydroRanger 200 is programmed for differential or average level

Operation (P001 = 4 or 5), two transducers of the same type must be used.

Volume Calculation

The unit provides a variety of volume calculation features (P050 to P055).

If the vessel does not match any of the eight preset Tank Shape calculations, a Universal

Volume calculation may be used. Use the level/volume graph or chart provided by the

vessel fabricator (or create one based on the vessel dimensions). Based on the graph,

choose the Universal Volume calculation, and select the level vs. volume breakpoints to

be entered (32 max). Generally, the more breakpoints entered, the greater the accuracy.

Universal, Linear (P050 = 9)

This volume calculation creates a piece-wise linear approximation of the level/volume

curve. This option provides best results if the curve has sharp angles joining relatively

linear sections.

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Siemens HydroRanger 200 Instruction Manual Page 228