7. Flow rate characteristics
Hysteresis due to magnetic saturation is a characteristic of solenoid valves. For
this reason, the voltage/flow rate characteristics are, as shown in the figure below,
not linear. This does not pose a problem when used in combination with the LM
as a feedback system, but care needs to be taken when using this device singularly
in an open loop.
8. Operation
(1) When using in combination with the LM (liquid control)
When using with the LM liquid mass flow meter please connect this device and
the LM with the cable provided. The LM has built-in control circuitry for the
control of the CV so that additional wiring is not necessary.
Please refer to “Instruction manual of LM” for details.
(2) When using this device only
When using this device in combination with LM or singularly, please take note
of the following items.
1) Use a control voltage of within 15VDC. The current consumption at an applied
voltage of 15VDC isa maximum 200mA.
2) Thecontrolvalveisasolenoidactuator.Becausethisresultsinaninductanceload,
pleaseinstall a reverse current prevention circuit wherenecessary.
3) Thevoltage/flowratecharacteristicsarenotlinear.Additionally,hysteresisisalso
present.
(3) Procedure
1) Thisproduct is packaged in a clean room before shipment. Please break seals
in a clean room after taking it out of packing box.
2) Check the liquid type and flow rate, and the direction of the liquid flow
before installation.
3) Check the leaks from tubing with a helium leak detector.
4) Connect the analog interface connectors according to the connector table in
“Instruction manual of LM”. Please use CC-LV-3 to connect LM and CV.
5) Power requirements are +15VDC:150mA and -15VDC:200mA. Check the
voltage, polarity and capacitance of power supply voltage.
6) Turn on the power supply and let the equipment warm up for 5 minutes
(Recommendedtime :30min.).
7) Adjustthe zeropointbypressingthezero-adjustmentswitchlocated onthetopof
theequipment.Beforezeroadjustment,checkthatliquidisnotbeingsupplied
and the device was warmed up for 30 minutes or more in order to ensure
sensorstability.
8) Input the flow rate setting signal and supply liquid with required differential
pressure to the LM. The LM will begin to control the liquid flow in proportionto
the preset voltage. Full-scale voltage is 5VDC. Maximum input voltage is
±15.5VDC.
9) When the output flow rate signal is used, the tolerance voltage of the external
device should be more than ±15.5VDC. When it’s connected, the output
valve may be within the range of the maximum voltage ±15.5VDC.
10) When a highlyreactiveliquid is used, please thoroughly purgethetubing and
the LM before operation.
11) When contaminated liquid is used, install a filter at the equipment inlet.
12) Use the LM within the range of the operating temperature (15 to 35°C), and
keep it at the same temperature with the fluid. If used in any other
environments that do not meet the above-mentioned requirements, it is
unable to measure the flow rate accurately. And it may cause a failure.
13) Do not switch the power supply on and off within one second. It may cause a
failure.
14) Helium gas is recommended for pushing the liquid. If any other gas isused, the
dissolved gas will produce bubbles, and it may make the control unstable.
9. Product warranty
(1) Period
This product is guaranteed for a period of 1 year from date of shipment. Defects
are repaired according to the following regulations.
(2) Scope
Warranty coverage is restricted to this product only. Any other damage caused
by this product is not covered.
(3) Disclaimer facts
The following repairs are not covered by the warranty:
1) Failure caused by by-product of fluid used.
2) Failurecausedbymisuse(includingcarelessoperation)orincorrectrepairormodification.
3) Failure caused by dropping after purchasing.
4) Failure caused by a natural disasters.
Even if the warranty period is still in effect, the following items may not be repaired.
1) When the kind of fluid used in the product is unclear.
2) The product is returned with fluid remaining inside and safety cannot be
confirmed.
This device is a precision instrument. Control may become unstable if electric
noise, temperature change of fluid, pulsation of fluid pressure etc. occurs.
Please be forewarned.
This instruction manual is subject to revision without notice.
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