FCI ST75 - Hardware Verification

ST75/ST75V Mass Flow Meter Fluid Components International LLC
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Hardware Verication
Equipment Required:
• Digital Multimeter
• Screwdriver
The ST75/ST75V ow meter is made up of these basic components:
• Sensor element.
• Customer interface circuit board
• Control circuit assembly circuit board module.
• Electronics enclosure.
Step 1
Verify fuse (F1) located on the customer interface circuit board is in normal working condition.
Remove power from the instrument. Open the electronics enclosure exposing the customer interface circuit board. This circuit board is
located under the shorter enclosure lid along with all of the power and input/output connections. Unscrew the clear cover on the fuse
and pull the fuse out of the fuse holder. Check the fuse for continuity. If fuse reads open, replace with equivalent component (FCI part
no. 019933-01), Wickmann Inc. Series 374, 1.6 A (amp code 1160), package 0410 (short radial leads).
AC power customer interface circuit board
shown. Fuse (F1) on DC power customer inter-
face circuit board located in similar position.
Step 2
Verify interconnecting cable from the customer interface board and the control circuit board assembly module are correctly seated into
the appropriate header.
Remove power from the instrument. Open the electronics enclosure exposing the customer interface circuit board. This circuit board
is located under the shorter enclosure lid along with all of the power and input/output connections. Remove the 2 screws securing the
interface circuit board to the electronics enclosure. Carefully lift the interface board out of the housing exposing the interconnecting
cable between the interface board and the control circuit assembly. Verify cable is seated rmly at both ends of the cable header.
C00935-1
(TR5, 250V
F1
1.6A, SB, UL)
TB1
4-20mA
SOURCE
OUT
ANALOG
TB2
4-20mA
RTN
OUT
PULSE
ON
TB3
SINK
COM
NEUT
AC
85-265VAC
LINE
AC
POWER IN
GND
EARTH
P3
FC88/CLI
FCI
S/N
Fuse (F1)
Cable Header
Interface Board
Control Circuit
Assembly