Note: The sensitivity setting can be carried out even if stable sensing is not possible.
٨
٨
In case output chatter is caused by a liquid drop on the fiber head:
FX-301
(
P
),
FX-302
(
P
),
FX-303
(
P
),
FX-D1
(
P
),
FX-A1
(
P
):
Use the limit teaching, or the timer function.
Red LED type of
FX-7
series:
Use the sensitivity shift function or the timer function (excluding
FX-75
).
FX-311
(
P
),
FX-M1
(
P
), long sensing range type of
FX-10
series:
Turn the sensitivity adjuster further clockwise to raise the sensitivity level, or use
the timer function.
In case the tank bottom, etc., gets sensed:
Readjust the sensitivity after setting at the actual depth at which detection is to be
done.
Troubleshooting
Ԟ
ԝ
ON when not
immersed
The fibers are mounted in the tank.
Ԛ
ԙ
Ԙ
Ԝ
ԛ
ON when
immersed
Sensing condition
Step
Description
Set the mode selection switch to 'SET'.
Press the ON button.
When the sensor accepts the ON condition, the
stability indicator (green) blinks.
The stability indicator blinks twice if the difference between the
ON level and the OFF level is sufficient enougt to detect the
liquid level stably. (Note)
The stability indicator blinks continuously if the difference is so
small that stable detection of the liquid level is not possible. (Note)
Press the OFF button.
Set the mode selection switch to 'RUN'.
Then, the set sensitivity is registered. Even if the
buttons are pressed by mistake in 'RUN' mode,
the registered sensitivity stays unchanged.
RUN
SIF
SET
RUN
SIF
SET
٨
This is the method of setting the sensitivity by teaching only the water absent
condition (not immersed condition).
<Limit teaching>
Notes: 1)
2)
3)
If the jog switch is pressed continuously 3 sec., or more, full auto-teaching is
done. In case of
FD-F8Y
, correct sensitivity setting cannot be done in full
auto-teaching.
Also, if the mode selection switch is changed to 'RUN' while level indicators
'4' and '5' are blinking, the incident light intensity taught at Step
Ԛ
is not re-
corded.
When the mode selection switch is set to 'SET' or 'MODE', the sensor is
more susceptible to extraneous light. Hence, when sensing a liquid, ensure
to set the mode selection switch to 'RUN'.
When the mode selection switch is changed from 'SET' to 'RUN' or from
'MODE' to 'RUN', the set sensitivity or the contents of each mode setting are
stored in an EEPROM. However, since the EEPROM has a lifetime, the sen-
sitivity setting cannot be done for more than 100,000 times.
Step
Level indicators
Description
SET
MODE
RUN
SET
MODE
RUN
Turn the jog switch to the '+' side.
The sensitivity is increased by 15% appox. respect to
that set at step
Ԛ
.
The fibers are mounted in the tank.
Ԛ
ԙ
Ԙ
Set the mode selection switch to 'SET'. The
present sensitivity is displayed.
Ԝ
ԛ
Set the mode selection switch to 'RUN'. (Note 2)
The sensitivity level does not change even if
the jog switch is operated.
(e.g.) The level indicators in the figure on the left show that the
sensitivity level is in the range 720 to 729.
Press the jog switch in the fiber not immersed condition. The level in-
dicators '3' and '6' blink.
Release the jog switch within 3 sec. The lev-
el indicators '4' and '5' blink and the incident
light intensity in the fiber not immersed con-
dition is read. (Note 1)
Press
㪫㫌㫉㫅㩷㫋㫆㩷㩾㪂㩾㩷㫊㫀㪻㪼
When using the red LED type of FX-7 series
Notes: 1)
2)
In order to protect the mechanism, the sensitivity adjuster idles when over
turned, which may result in a backlash of 1 to 2 divisions.
Depending upon the sensing conditions, stable sensing may be possible at
a position which is slightly shifted from the optimum sensitivity point.
٨
٨
٨
Adjust the sensitivity, observing the op-
eration indicator (orange).
However, since the condition for light-
ing up of the indicator depends on the
combination of the sensing condition
and selected MODE for L/D-ON, verify
it from the table on the right.
The sensitivity adjuster is a 12-turn po-
tentiometer. The maximum sensitivity
is obtained by turning it fully clockwise.
The sensitivity level indicator shows the present sensitivity level.
When using the FX-M1(P)
MODE
L-ON (ON when not immersed)
L-ON (ON when not immersed)
D-ON (ON when immersed)
D-ON (ON when immersed)
Operation
indicator
Immersed
Not
immersed
Sensing
condition
: Lights off
: Lights up,
Turn the sensitivity adjuster fully counterclock-
wise.
(Minimum sensitivity)
ڎ
Make sure that the
operation selection
switch is set to L-ON
(not immersed ON).
MAX
ON
MAX
OFF
ON
MAX
Operation
Ԝ
ԛ
Ԛ
ԙ
Ԙ
Select the mode either L-ON (not immersed ON) or D-ON (immersed ON) according to your application.
Step
Sensitivity
level indicator
Sensing method
MAX
Optimum
point
In the fiber not immersed condition, slowly turn
the adjuster clockwise and find the point
where the sensor is switched ON.
In the fiber immersed condition, slowly turn the
adjuster further clockwise until the sensor goes
into the ON state again. Once it is switched on,
turn the adjuster counterclockwise a little and find
the point where it is switched OFF.
If the sensor does not go into the ON state,
MAX is the point .
Set the adjuster at the center of points and .
This is regarded as the optimum sensitivity point.
Fiber not immersed
Fiber immersed
Notes: 1)
2)
In order to protect the mechanism, the sensitivity adjuster idles when over
turned, which may result in a backlash of 1 to 2 divisions.
Depending upon the sensing conditions, stable sensing may be possible at
a position which is slightly shifted from the optimum sensitivity point.
٨
٨
٨
Adjust the sensitivity, observing the op-
eration indicator (orange).
However, since the condition for light-
ing up of the indicator depends on the
combination of the sensing condition
and selected MODE for L/D-ON, verify
it from the table on the right.
The sensitivity adjuster is a 8-turn po-
tentiometer. The maximum sensitivity
is obtained by turning it fully clockwise.
The sensitivity level indicator shows the present sensitivity level.
When using the long sensing range type of FX-10 series
MODE
L-ON (ON when not immersed)
L-ON (ON when not immersed)
D-ON (ON when immersed)
D-ON (ON when immersed)
Operation
indicator
Immersed
Not
immersed
Sensing
condition
: Lights off
: Lights up,
Select the mode either L-ON (not immersed ON) or D-ON (immersed ON) according to your application.
MAX
MAX
ON
OFF
ON
MAX
Turn the sensitivity adjuster fully counterclock-
wise.
(Minimum sensitivity)
ڎ
Make sure that the
operation selection
switch is set to L-ON
(not immersed ON).
Operation
Ԝ
ԛ
Ԛ
ԙ
Ԙ
Step
Sensitivity
level indicator
Sensing method
MAX
Optimum
point
In the fiber not immersed condition, slowly turn
the adjuster clockwise and find the point
where the sensor is switched ON.
In the fiber immersed condition, slowly turn the
adjuster further clockwise until the sensor goes
into the ON state again. Once it is switched on,
turn the adjuster counterclockwise a little and find
the point where it is switched OFF.
If the sensor does not go into the ON state,
MAX is the point .
Set the adjuster at the center of points and .
This is regarded as the optimum sensitivity point.
Fiber not immersed
Fiber immersed
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15%
0
OFF
ON
Turn to '+' side
Sensitivity leval
100%
High
Low
Sensitivity level
Sensitivity level with
fiber not immersed
