Sperry Marine NAVIGAT 100, Operation, Installation And Service Manual

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NAVIGAT 100 056373/D
Protecting the Gyrosphere from Low Temperatures 5-1
Chapter 5: Preventive Maintenance
5.1 Protecting the Gyrosphere from Low Temperatures
The permitted ambient temperature for the operation of the gyrocom-
pass system is from -10° C to +55° C.
When the ambient temperature at the gyrocompass' location falls below
-10° C while the compass is in operation or when the ambient tempera-
ture falls below 0° C while the compass is not in operation, the gyro-
sphere container must be removed from the compass housing and
stored in a place where the ambient temperature will not fall below 0° C.
Removal and storage of the container as a whole (with the gyrosphere
installed), as well as later re-installation of the container may be carried
out by shipboard personnel.
Always be aware, that in case no storage place is available where the
ambient temperature will not fall below 0° C, the gyrosphere must be
removed by authorized service personnel from the gyrosphere con-
tainer to prevent possible damage by frozen supporting fluid.
CAUTION
Risk of damage/destruction through low temperatures
The supporting fluid in the gyrosphere container will start freezing at
temperatures below 0° C.
The NAVIGAT 100 must no longer be operated when the ambient tem-
perature at the gyrocompass’ location falls below -10° C while the com-
pass is in operation or when the ambient temperature falls below 0° C
while the gyrocompass is not in operation.
Always make sure, that the ambient temperature is higher than 0° C
respective 10° C. If this is not possible, the gyrosphere container with the
gyrosphere must be removed from the NAVIGAT 100 and transported to
a place with sufficient ambient temperature.
Make sure to remove the gyrosphere from the gyrosphere container if no
place with sufficient ambient temperature is available to eliminate dam-
age from freezing supporting fluid. The removal is to be executed in a
service work procedure by authorized service personnel only.
CAUTION
Risk of damage through unauthorized service
Only authorized service personnel is allowed to remove the gyrosphere
from the gyrosphere container.
Always keep to the mandatory safety requirements and the correct ser-
vice work procedure to remove the gyrosphere from the gyrosphere con-
tainer.
Note For installation and service procedures of the gyrosphere and gyro-
sphere container, the following separate Installation, Maintenance and
Service Procedures, delivered with the gyrosphere, apply:
- 05026-0125-001, for gyrosphere type 3, gyrosphere container mod. 10/3.
- 05000-0125-003, or gyrosphere type 3, gyrosphere container mod. 10/4.