ST75/ST75V Mass Flow Meter
Fluid Components International LLC
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15
06EN003368 Rev. G
Transmitter Circuit Calibration Check (Delta R Verification)
References
• Delta ‘R’ Data Sheet
Equipment
• FC88 Communicator or equivalent.
• DVM
• Delta R data sheet - Match by serial numbers
• 2 ea. precision decade resistance boxes, 0.1% (Largest steps: 1k ohm, smallest steps 0.01 ohms)
• Small flat blade screwdriver, 3/32 inches wide blade
• FCI normalization cable, FCI part number 006407
Procedure
1. Verify all “D” mode calibration parameters are correct according to the meter’s Delta R data sheet before starting verification.
2. Turn power OFF.
3. Mark all sensor element wires connected to the circuit board for easier reconnection to the proper terminals. Disconnect the wires.
4. Connect the resistance decade box to the electronics as per the appropriate wiring diagram for the ST75/ST75V.
Note
:
Interconnecting wiring (resistance decade box to electronics) must be same gauge and length to avoid any inaccura-
cies in the Delta R verification caused by unequal wire lengths and/or wire gauges.
5. Set both decade boxes for the nominal resistance value (1000 ohms) ±0.01%
6. Connect DVM to the meter’s output termination and monitor the meter output.
7. Turn the power ON and allow the instrument 5 minutes to stabilize.
8. With the FC88 connected, Press [T] [Enter] to view the Normal Operating Mode.
9. Adjust the Active decade box (Reference decade box remains fixed @ 1000 ohms) to achieve the appropriate Delta R for the
displayed flow value and output, noted on the meter’s Delta R data sheet.
10. Note the [C] mode and verify the meter’s displayed TCDR and REFR values corresponding to the displayed flow rate as per
the meter’s Delta R data sheet.
11. Return to normal mode operation ([T] mode).
REFERENCE
1433-W DECADE RESISTOR GENERAL RADIO USA
987
6
X
G
23mA MAX
1K STEPS
H
L
10
K
2
0
1
4 5
3
ACTIVE
6
8 9
X
6 7
100 STEPS
80mA MAX
21
0
435
21
4 5
3
1433-W DECADE RESISTOR GENERAL RADIO USA
X
6 7 8 9
G
1K STEPS
23mA MAX
H
L
10
K
10
2
4 5
3
76
X98
6
100 STEPS
80mA MAX
0
1
2
5
34
1
2
4 5
3
NORMALIZATION CABLE
FCI P/N 006407
2
3
1
4
ACT 3
ORANGE
3
4
CABLE WIRING SCHEMATIC
ORANGE
ACT 4
2
1
BLACK
BLACK
REF 2
REF 1
PIN ONE
CABLE PIN OUTS
END VIEW
SIDE VIEW
C10
GND
C1
U3 C5
CR8
CR7
CR6
U5
C12
C11
C2
PWB 019695-01
C7
J1
P1
CR3
CR10
CR9
C4
ACT
R5
V+
REV
P2
FCI
-
IN USA
MADE
REV-
AC
BLACK
BLACK
ORANGE
ORANGE
PIN ONE
INDICATOR
REF
C00933-1-2
