SAL R1a Easy Tank User Manual No. 703852
703852A04, SIMRAD SAL R1a Easy Tank User Manual.docx 14 (25)
for up to ten different speed levels. Speeds between the calibrated points are
interpolated automatically.
Note: The minimum necessary calibrations to be set are the TRU TC-calibration plus at
least one of the draught calibrations. If so, after setting the TRU TC-calibration (see
below), choose e.g. FULL LOAD and determine and set a compensating calibration
factor for the normal cruising speed used at normal load conditions (see below).
Draught dependent calibration and Speed dependent calibration should normally not be
used at the same time.
The system also has a function for compensating small differences in characteristics of
individual transducers. This TRU calibration is a fixed compensation factor, TC. The TC
factor is marked on the transducer body and on the transducer cable termination end.
This factor has to be set at commissioning and before any other calibration method is
initiated.
When replacing the transducer the new TC factor has to be entered according to the TC
factor marked on the new transducer.
3.8.1 TRU Calibration
Each transducer has been individually calibrated in factory and its compensation factor
must be entered into the speed log it is connected to. The factor is engraved on the
transducer housing as TC±XXX. It is also labelled at the termination end of the TRU-
cable core No.1. Example: TC+123 means calibration actually indicate a factor +1.23%
and TC-101 consequently –1.01%.
Note: The TC value shall be set before any other calibration is performed.
Procedure to set TC calibration:
(Refer to paragraph 1.4 Menu mode above how to move in the Menu System)
Go to the Menu mode;
Step to R0 REMOTE DEV and then down to R1a/WTU sub-menu C0.
Choose WRITE ACCESS ON (+ and Enter) and proceed to menu C4.
C4 TRU CALIBRAT.
MARKING: TC±000
Change the value by using +/- buttons and then press Enter to save.
To leave this menu, press Menu and Enter simultaneously two times.
Leave the WTU Normal Operation menu and the SD4 Menu mode and return to the
normal Trip/Total display mode by pressing Esc three times.
3.8.2 Draught dependent calibration – (Single point calibration)
This type of calibration is meant for merchant vessels where the water flow around the
hull is changing due to varying draught and trim. Three calibrations can be performed for
cruising speeds relevant to each of three decided draught/load conditions (FULL LOAD
or BALLAST 1 or BALLAST 2). These calibrations are compensating with the same
calibration percentage, respectively, over the whole speed range. Determining these
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