ST51A/ST75A/ST75AV Mass Flow Meters
TROUBLESHOOTING
Fluid Components International LLC
69
Hardware Verification
Equipment Required:
●
Digital Multimeter (DMM)
Fuse Check
Verify that fuse F1, located on the interface board, is in normal working condition. Refer to
for details
on fuse access/location. Check the fuse for continuity. If fuse reads open, replace it with Littelfuse 454 Series fuse, part no. 045401.5.
Sensor Check
Verify sensor element continuity and resistance (integral unit only).
1. Remove power from the instrument.
2. Remove enclosure housing blind lid, exposing interface board and its power and signal connections. See
3. Remove sensor plug from interface board J4 (squeeze plug’s latch at top of connector, and then pull up).
4. Using an ohmmeter measure resistance between socket pins 1 & 3 (active) and socket pins 5 & 7 (reference). Verify that both readings are
within 1100
Ω
±20
Ω
. The resistance is temperature dependent. The resistance at 70 °F is approximately 1082
Ω
. Refer to
below.
Figure 28 – Reference and Active Sensor Resistance Check (AC Version Shown)
FCI provides full in-house technical support. Additional technical representation is also provided by FCI field representatives. Before
contacting a field or in-house representative perform the troubleshooting techniques outlined in this manual. If problems persist, contact the
FCI Customer Service department at 1-800-854-1993 or 1-760-744-6950.
If the instrument is to be returned to FCI, first obtain a Return Authorization (RA) number from the factory. The RA form (see pages
includes a declaration of decontamination clearing information with which the instrument must comply before shipment to FCI.
PIN 1
NOTCH FOR
PLUG KEY
J4 SENSOR
CONNECTOR
INTERFACE BOARD, TOP
(AC VERSION SHOWN)
SENSOR CONNECTOR
PIN SOCKET PLUG
SENSOR CHECK: Measure resistance between
pins 1 & 3 (active) and 5 & 7 (reference).
REFERENCE RTD
(Black Wires)
KEY, PLUG
LATCH, CONNECTOR
CONNECTOR
SIDE VIEW
C01172-1-2
Summary of Contents for ST51A
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