Fluid Components International ST51 - Manual (Page 14)

FLUID COMPONENTS INTERNATIONAL LLC ST51 MASS FLOW
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Hardware Verification
Equipment Required:
Digital Multimeter
Screw Driver
The ST51 Flowmeter is comprised of 4 basic components:
1. Sensor element.
2. Customer interface circuit board
3. Control circuit assembly circuit board module.
4. 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, amp code 1160, package 41.
Ac power customer interface circuit board shown. Fuse (F1) on DC power customer interface 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 face board exposing the interconnecting cable between
the interface board and the control circuit assembly. Verify cable is seated firmly at both ends of the cable header.
Fuse (F1)
Cable Header
Interface Board
Control Circuit
Assembly