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TROUBLESHOOTING
ST51A/ST75A/ST75AV Mass Flow Meters
70
Fluid Components International LLC
Transmitter Circuit Calibration Check (Delta R Verification)
References
●
Delta R Data Sheet
Equipment
●
Serial console connection to instrument via FC88 or PC (see
Instrument Configuration and Setup Using the Service Port (RS-232)
●
DMM
●
Delta R data sheet (matched to serial number of instrument under test)
●
Two precision decade resistance boxes, 0.1% (largest steps: 1 K
Ω
, smallest steps: 0.01
Ω
)
●
250 Ω
axial lead precision resistor, 0.1% or better, 1 W
●
Small flat-blade screwdriver, 3/32
″ width
blade
●
Banana plug jumper cable
●
FCI Normalization Cable (FCI part number 022610-0x, unit part number 022517)
Procedure
1. Verify all “D” mode calibration parameters are correct according to the meter’s Delta R Data Sheet before starting. See
2. Turn instrument power OFF.
3. Remove enclosure housing blind lid, exposing interface board and its power and signal connections. See
4.
Install 250 Ω
precision resistor across instrument’s Ch.1 4-20 mA output (INT_HART- & I/J8-4 & J8-1).
5. Connect normalization cable plug to interface board J4. Connect other end of normalization cable (with 2 pair of dual banana plugs) to
resistance decade boxes as shown in
Note:
Interconnector wiring (resistance decade box to electronics) must be 24 AWG and less than 36 inches long to avoid
any inaccuracies caused by improper wire lengths or wire gauges.
6. Connect both resistance decade box LOW terminals together with banana plug jumper cable (stack onto dual plug).
7. Set both decade boxes for nominal
resistance value (1000 Ω) ±
0.01%.
8. Connect DMM, set for volts DC, across 250
Ω resistor
and monitor voltage output.
9. Turn power ON and allow 5 minutes for stabilization.
10. At serial console main menu enter “1” to place instrument in “RS-232” mode (which puts instrument in “Normal Mode Operation”).
(See
11. Adjust Active decade box (Reference decade box remains fixed @ 1000 ohms) to achieve the appropriate Delta R for displayed flow
value and output, noted on meter’s Delta R Data Sheet.
12. Enter “C” at console. Verify meter’s displayed TCDR and REFR values correspond to displayed flow rate per meter’s Delta R Data Sheet.
13. Return to Normal Mode Operation (“T” menu).
Содержание ST51A
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