B-320-2-E
38
SYMPTOM
POSSIBLE CAUSE
CHECKOUT AND COUNTERMEASURE
Ref. page
4. Shutoff valve
fails to respond
to
START
▲
button
depression.
Batch setpoint at "0".
Set to any batch setpoint other than 0.
2
Not reset after a batch operation.
Reset each time a batch process has been completed.
2
Shutoff valve operating air
pressure is low, or not supplied.
Readjust air pressure with reducing valve, etc.
3
Air signal line for operating
the shutoff valve is connected
incorrectly.
Referring to Sec. 5 "Air Signal Line Connections" in this
manual, inspect air signal line connections.
13 to 15
Trouble lies in the solenoid valve.
(Air output signal from the solenoid
valve fails to be switched.)
Referring to Sec. 5 "Air Signal Line Connections", make
sure of proper air signal switching and its output.
13 to 15
Trouble lies in the shutoff valve (if
air output signal from the solenoid
valve above has been properly
switched).
Isolate problems in the shutoff valve.
-
5. Shutoff valve
responds to
START
▲
button
but the process
fluid fails to flow.
Flowrate is low.
Open shutoff valve progressively.
-
Pump pressure or head pressure is
low.
Taking pressure loss of the entire piping system into
account, adjust to the proper pump or head pressure.
-
Oval rotors stuck with solids and
locked, blocking the fluid flow.
Referring to Sec. 9.3 "Flowmeter Body Disassembly",
disassemble the meter and inspect it for condition.
32 to 35
6. Shutoff valve
responds to
START
▲
button
and the process
fluid flows, but
the totalizer does
not count.
Trouble lies in the sensor
assembly.
Make sure to see if the sensor provides a flow signal
output. Referring to Sec. 9.1 "Register Inspection",
monitor waveshapes at test pins SIG and PLS .
29
Flowrate signal frequency has
exceeded its limit.
Inspect similar to the above and make sure that the pulse
frequency at test pin PLS is held below 200Hz.
29
Sensor installed the wrong way.
Referring to Sec. 9.2 "Register Disassembly", inspect
the sensor for correct installation.
30
3
Oval rotors installed the wrong
way.
Referring to Sec. 9.3 "Flowmeter Body Disassembly",
inspect the meter for correct installation.
32 to 35
7. Pressing
STOP
ROT.
button fails to
stop the shutoff
valve.
Double-acting type shutoff
valve: Shutoff valve operating air
pressure has decreased during a
batch process.
Readjust air pressure with reducing valve, etc.
12 to 13
STOP
ROT.
button is not pushed in all
the way.
If pressing
STOP
ROT.
button all the way does not work,
repeat the same procedure with internal buttons on the
internal assembly. If this proves to be successful, trouble
is suspected in the external buttons or in the internal
assembly.
16
19
8. Shutoff valve
does not open
promptly upon
START
▲
button
depression.
Time lag is not consistent.
Any fluctuations in shutoff valve operating air pressure?
-
Time lag is consistent.
The compressor has adequate air capacity? Any leaks
at pipeline connections?
-
9. Unusual sound
from the
flowmeter body.
Air is entrapped.
Reduce flowrate and let the air in the pipeline out
completely.
-
Process fluid vaporizes in the
pipeline.
Reduce flowrate and adjust process fluid temperature
and pressure until vaporization ceases.
-
Oval rotors are revolving in
contact with the measuring
chamber.
Referring to Sec. 9.3 "Flowmeter Body Disassembly",
disassemble and inspect for condition.
32 to 35
⇨
Continued on next page.