13.1.1 Each cargo tank shall be provided with
a means for indicating level, pressure and temperature of the cargo.
Pressure gauges and temperature indicating devices shall be installed
in the liquid and vapour piping systems, in cargo refrigeration installations.
13.1.2 If loading and unloading of the ship is
performed by means of remotely controlled valves and pumps, all controls
and indicators associated with a given cargo tank shall be concentrated
in one control position.
13.1.3 Instruments shall be tested to ensure reliability
under the working conditions, and recalibrated at regular intervals.
Test procedures for instruments and the intervals between recalibration
shall be in accordance with manufacturer's recommendations.