-
37
-
C a l i b r a t i o n
S t a n d a r d
V F
S e t
S t a n d a r d
T .
゜ C
0
2 5.
C a l i b r a t i o n
S t a n d a r d
V F
S e t
F l o w
R a t e
L / m i n
0
0.
3
C a l i b r a t i o n
S t a n d a r d
V F
A d j . F l o w R a t e
L / m i n
0
0.
3
Flow Rate (Suction Flow Rate Calibration)
(1) Connect a "standard flowmeter" to the LV-40BW.
(2) When "1 Flow Rate" is selected and the
[ENTER] key is pressed, the current
standard temperature setting is displayed.
The default setting is 25
°
C. Select the
standard temperature from among 0
°
C,
20
°
C and 25
°
C by pressing the [UP] and
[DOWN] keys, and press the [ENTER] key.
(3) Set the flow rate. Press the [UP] and
[DOWN] keys to change the numerical
value.
(4) When the preparation is completed, press the [START/STOP] key to start calibration.
"Offset" is displayed on the 3rd line, and the suction pump starts operating. After the pump
starts up, "Waiting" is displayed for about one minute for the suction flow rate to stabilize.
One minute after the pump has started up, "Start Sample Run" is displayed. Make sure that
the instantaneous flow rate display value has stabilized, and note down the readout value on
the standard flowmeter. Convert the readout value on the standard flowmeter to the volume
flow rate in the standard state according to the standard temperature set in step (2). For
example, when 25
°
C is selected, obtain the volume flow rate after conversion to 25
°
C and
1 atmosphere.
(5) When you have noted down the readout
value on the standard flowmeter, press the
[START/STOP] key. Pump operation stops,
"Adj. Flow Rate" is displayed on the 3rd
line, and the average flow rate during
pump operation is displayed.
Match the flow rate display to the readout
value on the standard flowmeter by
pressing the [UP] and [DOWN] keys. Press the [ENTER] key. Calibration input is accepted,
and the screen returns to the Calibration menu.
* After setting the numerical value, if the [MENU/ESCAPE] key is pressed before
the [ENTER] key is pressed, the screen will return to the Calibration menu
without the newly entered value being accepted.
* The average flow rate displayed at (5) is displayed with the adjustment value
of the previous calibration reset. For this reason, the average flow rate may
differ from the suction flow rate displayed outside of the Calibration menu.
Perform error measurement for the suction flow rate in a different menu after
calibration.
* Calibrate "suction flow rate" after calibrating the "ambient temperature
sensor" and "ambient pressure sensor." For the actual volume flow rate
(Actual VF), correct the flow rate by "ambient temperature" and "ambient
pressure." For this reason, if the "ambient temperature sensor" and "ambient
pressure sensor" are calibrated after the "suction flow rate" is calibrated,
they will be affected by an error in the "ambient temperature" and "ambient
pressure," and the precision of the instantaneous and total flow rates in
actual volume flow rate units will not be guaranteed.
