COMMISSIONING
Part No.: 4417340 Revision 1 Service Manual 109
954 SmartServo FlexLine
With the HART protocol, an analog 4-20 mA signal can be combined
with a digital Frequency Shift Keying (FSK) signal. See Figure 7-10
Figure 7-10
The analog and digital signals within the HART
®
communication
7.3.7.2 Software Description
The FCI-HT board, being a functional module of the 954 SmartServo
FlexLine, contains embedded software which enables it to collect data
input from sensors via both the HART bus and the FlexConn CAN bus.
Moreover the FCI-HT module can calculate the HIMS
1
product density.
The main function of the FCI-HT software is to measure HIMS product
density, by connecting the FCI-HT board via the HART bus to 1 or 2
pressure sensors, and via the FlexConn bus to a product level and a
water level sensor.
To measure product density, the needed standard system configuration
is:
 HART pressure sensor P1 (product pressure)
 HART pressure sensor P3 (Vapour pressure)
 Product level scanned from a FlexConn board (e.g. TII-XR)
 Water level scanned from a FlexConn board (e.g. FII-VT)
For tanks that are free venting to the atmosphere or floating-roof tanks,
P3 pressure is not required. The water level sensor is also optional.
1. Hybrid Inventory Measurement System
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