Intek RheoVac 940 - Manual (Page 24)

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TABLE VI. Trouble Shooting Guide
OBSERVATION PROBA BLE CAUSE ACTION
'GENERAL FAU LT'
'MODE 0'
1. Shorted cable connection
2. Damaged flow sensor
1. Check for short in cable due to moisture
or corrosion
2. * Contact factory
‘GENERAL FAU LT'
'MODE 1'
1. Improper cable hookup
2. Failed A/D circuit. Short between
sensor terminals C and D of JP4 or
electronics terminals 3 and 4 of JP2
3. Damaged flow sensor
1. Verify cable hookup is correct
2. Check cable connections for proper
contacts or moisture & corrosion
3. * Contact factory
'GENERAL FAU LT'
'MODE 2'
1. Cable contact corroded
2. Damaged flow sensor
1. Check both ends of cable for moisture
or corrosion
2. * Contact factory
'GENERAL FAU LT'
'MODE 3'
1. Cab le cut or not co nnec ted at a ll 1. Che ck ca ble for conta ct and continuity
'GENERAL FAU LT'
'MODE 4'
1. Blown heater fuse at F1
2. Damaged flow sensor
1. Check wiring and rep lace fuse
2. * Contact factory
'GENERAL FAU LT'
'MODE 5'
1. Sensor's heater connection is open at
terminal H of JP4
2. Damaged flow sensor
1. Check sensor heater for an open
connection
2. * Contact factory
'GENERAL FAU LT'
'MODE 6'
1. Sens or at atm osp heric p ressure (fault
mode will disappear by the time
vacuum pressures are reached).
2. Pre ssure se nsor n ot co nnec ted at
terminal L of JP4
3. Damaged pressure sensor
1. Restore operating vacuum condition or
ignore indication
2. Check pressure sensor for an open
connection
3. * Contact fac tory
‘GENERAL FAU LT'
'MODE 7'
1. Temperature is above the specified
maximum (210°F)
2. Possible sensor damage
1. Record temperature and remove sensor
from flow stream
2. * Contact factory
Flow output saturates
high, will not
respond to flow
changes
1. Flow rate is not within range of
calibration
2. Loo se or d ama ged transd ucer c able
3. Blow n heater fuse
4. Bad electronic compo nent
1. Contact factory about re-ranging
instrument
2. Fix cable / connection
3. Rep lace fuse
4. * Contact factory
Flow output saturates
low will not respond
to flow changes
1. System pressure is above 10" Hg
2. Flow rate out of range of instrument
3. Loo se or d ama ged transd ucer c able
4. Bad electronic compo nent
1. Contact factory if operation above
10" Hg is required
2. Contact factory to re-range instrument
3. Fix cable connection
4. * Contact factory
* Record voltages in Table VII (last column) before contacting the factory. Use a high input impedance digital voltmeter for these
readings. All readings are to be taken from terminals A through U on JP4 (Dwg 94114-3, p. 10).