SMAR FI302, Operation, Maintenance & Instruction Manual

Page: 7 / 40

Section 1
1.1
Installation
General
The overall accuracy of measurement and control depends on several variables. Although the
converter has an outstanding performance, proper installation is essential, in order to maximize its
performance.
Among all factors, which may affect converter accuracy, environmental conditions are the most
difficult to control. There are, however, ways of reducing the effects of temperature, humidity and
vibration.
Locating the converter in areas protected from extreme environmental changes can minimize
temperature fluctuation effects.
In warm environments, the converter should be installed to avoid, as much as possible, direct expo-
sure to the sun. Installation close to lines and vessels subjected to high temperatures should also be
avoided.
Use of sunshades or heat shields to protect the converter from external heat sources should be
considered, if necessary.
Humidity is fatal to electronic circuits. In areas subjected to high relative humidity, the O-rings for the
electronics cover must be correctly placed. Removal of the electronics cover in the field should be
reduced to the minimum necessary, since each time it is removed the circuits are exposed to the
humidity. The electronic circuit is protected by a humidity proof coating, but frequent exposures to
humidity may affect the protection provided. It is also important to keep the covers tightened in
place. Every time they are removed, the threads are exposed to corrosion, since painting cannot
protect these parts. Code-approved sealing methods on conduit entering the converter should be
employed.
Mounting
Using the bracket, the mounting may be done in several positions, as shown on Figure 1.3 -
Dimensional Drawing and Mounting Positions.
For better visibility, the digital indicator may be rotated in steps of 90
°
(See the section Maintenance
Procedures).
Output Wiring
The output is in fact a current link. An external power source is therefore necessary. The FI302
controls the current in the loop. (See Figure 1.4 - Output Connections). The three channels have a
common ground for the external power supply.
The output load is limited by the voltage of the external power supply. Please refer to the load graph
to determine the maximum load.
On loss of power the output will be uncertain. If power is maintained, but communication is lost, the
output may be pre-configured to freeze or go to a safe value.
Electric Wiring
Access the wiring block by removing the Electrical Connection Cover. This cover can be locked
closed by the cover locking screw (See Figure 1.1 - Cover Locking). To release the cover, rotate the
locking screw clockwise.