Emerson MAS 2600 Absolute Transducers, Basic Rules, Forepeak Tank

Installation & User Manual
Ed 19UK June 2013
Page 8 of 28
Absolute Transducers:
The Absolute Transmitter is typically used if the amplifier is exposed to water, e.g. on open deck.
The Absolute Transmitter is available in 2 ranges: 0-20 and 0-35 mH2O. In practice this means 10
mH2O less than the nominal range because of the atmospheric pressure which must be taken into
consideration when choosing the transducer.
A transducer with an effective range larger than the tank height should be selected.
Basic Rules:
1. The selected measuring range must be larger than the tank height.
2. The selected measuring range must be larger than
tank height+ vent pipe height
2
EXAMPLE: Tank height = 6 m
Vent pipe height = 14 m
1. The selected measuring range must be larger than 6 m due to the height of the tank.
2. The selected measuring range must be larger than
6+ 14
2
= 10 m due to the total height of the
tank and the vent pipe combined.
Select a transducer with a measuring range of 16 mH2O as this is the next measuring rang e larger
than 10 m.
Turn the range select switch on the amplifier to range No. 7.
Normally the selection of transducer, range select and calibratio n are done by DAMCOS.
Special consideration applies to e.g. forepeak tanks and draft measuring when selecting the
measuring range of the transducer.
Forepeak Tank:
Transducer measuring range > tank height: Select the next meas uring range.
EXAMPLE: Tank height 12 m.
Based on the tank height a transducer with a measuring range of 16 mH2O should be selected.
However, due to the dynamic conditions in the forepeak tank, a transducer with a measuring
range of 35 mH2O, i.e. the next in line, should be selected.
Turn amplifier range select switch to range No. 6.