Kofloc RK1812 Series User manual

FJ400050D1
Created on 2021/12/20
Flowmeter with Photo Sensor
Model RK1812/RK1814 Series
Instruction Manual
Thank you for your selection of “KOFLOC Area Flow Meter.”
Prior to use, read this manual thoroughly to ensure your new meter will work to its
fullest capacity.

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Created on 2021/12/20
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CAUTION
This product is designed for controlling the flow rate and its
maximum working pressure is limited to:
(Gas) 1.0MPa(G) below 100mL/min
0.7MPa(G) below 5L/min
0.5MPa(G) above 10L/min
(Liquid) 1.0MPa(G) below 20mL/min
0.7MPa(G) below 150mL/min
0.5MPa(G) above 200mL/min
The use of fluids, such as toxic gas, other than those marked
on the flow meter or the use of the product at a temperature
or pressure above the maximum limits could result in
personal injury. Such a way of use is strictly prohibited.
Note that if solenoid valves are installed before and after
the flow meter and they are opened and closed under pressure,
the float will jump up to break the glass. Be sure the flow
meter will not be subjected to direct pressure fluctuations.
Foreword
Thank you for your selection of Model RK1812/Model RK1814 Series.
・The contents of the manual are subject to change without notice.
・The manual has been created meticulously. Should, however, you notice any
deficiencies, errors or omissions, you are kindly requested to notify us.
・The warranty period of this product is one (1) year after shipment.
・Failures attributable to KOFLOC which may occur during the warranty period will
be remedied free of charge.
・KOFLOC shall not be held responsible whatsoever for breakdown or trouble of
equipment which results from negligence of the precautions described in this
manual or using the product by methods other than the described procedures.

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1. Purpose
This manual describes how to read the flow rate indicated by the Flow Meter with
Photo Sensor Model RK1812 and how to utilize the photo sensor effectively.
It contains a procedure of correct installation and piping, procedure of correct use of
the meter and procedure of fine adjustment of the photo sensor reaction.
If you have any questions or doubt about the contents of this document, please contact
us.
2. Installation and Piping
Select either installation method; embedding in the panel (secured together with the
front cover) or mounting on the panel (secured with included nuts).
3. How to Use
3-1 Basic Handling Procedure of the Flow Meter
For the basic handling procedure, see KOFLOC standard “Flow Meter Instruction
Manual.”
For the electric specifications and handling of the photo sensor, see the included
“UM Series Instruction Manual.”
3-2 Procedure of adjusting the sensor part and checking the sensor reaction
As a rule, the contact has been adjusted to the optimum reaction at shipment.
Only when the photo sensor needs to be adjusted finely depending on the user
environment and conditions of use, use the following procedure to adjust the sensor.
If the optimum contact reaction cannot be obtained by the following procedure, it is
requested that you return the product to us.
3-2-1Adjustment method
①Turn the sensitivity adjust variable resistor to the minimum.
②Connect wires and make sure that light (optical axis) from the sensor light
projector side will not be blocked off.
③Turn the sensitivity adjust variable resistor until both of the green and red
indicator lamps light up simultaneously.
④Block off the optical axis with the float and make sure that the contact signal will
be interrupted and only the green indicator lamp will remain lit.

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Created on 2021/12/20
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4. Specifications
－RK1812･RK1814 －
Gas
Liquid
Applicable fluid
Air, N2, O2, H2, He, Ar, CO2
（Calculating calibration for other
gases）
Standard liquid：H2O
（Calculating calibration for other
liquid.）
Flow rate
ranges
Various standard ranges from 5 to
50mL/min and 5 to 50L/min
（Air conversion-atm）
Various standard ranges from 2
to 20mL/min and 0.1 to 1L/min
Accuracy
Within ±2% F.S.
Maximum
pressure
1.0MPa(G) below 100mL/min
0.7MPa(G) below 5L/min
0.5MPa(G) above 10L/min
1.0MPa(G) below 20mL/min
0.7MPa(G) below 150mL/min
0.5MPa(G) above 200mL/min
Fluid contact
materials
(B) BSBM, Hard glass, NBR (POM, SUS316, PTFE)
(SS) SUS316, Hard glass, FKM (PCTFE, PTFE)
Connection
Rc1/4（Standard）
Alarm setting
range
10 - 90% F.S.
Environmental
temp
5 - 55℃
sensing volume
to minimum leve
Indicator light (green)
Indicator light (red)

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Created on 2021/12/20
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【Specifications of photosensors】
Power supply
DC24V±10%, Ripple 10%(max)
Current consumption
Trns：15mA, Rcvr：22mA (max)
Output mode
NPN Open collector, Sink current 80mA (30VDC) Max.
Operating mode
Light-on
Response time
0.5msec (max)
Connection
Trns：0.15mm2×2core 2m (gray)
Rcvr：0.15mm2×3core 2m (black)
Manufacturer
TAKENAKA ELECTRONIC INDUSTRIAL CO.,LTD.
Model
UM-T15TV(DC24V)
Photosensor with built-in amplifier with sensitivity volume (Rcvt side)
5. Product Warranty Policy
Thank you for your continued support of KOFLOC products.
Unless specified otherwise in quotations, contracts or specifications when you place
orders for KOFLOC products, the following warranty policy will apply.
Warranty Policy:
①Warranty period
The warranty period is one (1) year from shipment, provided that the product is
used within the KOFLOC specification.
②Scope of warranty
If the KOFLOC product fails during the warranty period due to a cause
attributable to KOFLOC, KOFLOC shall, at its option and expense, provide a
replacement product or repair the failed product at the KOFLOC factory.
This warranty, however, shall not cover damages due to a cause not
attributable to KOFLOC; opportunity loss, lost profit, secondary disaster,
accident compensation suffered by the customer and damage to other
equipment and any other damages due to a failure of the KOFLOC product.
③Non-warranty
The warranty shall not apply to the following failures and damages even if they
occur during the warranty period:
a) Failure due to misuse or improper repair or modification. (Failures
resulting from use under conditions different from the manufacturing
specifications are included.)
b) Damage and failure due to dropping of the product after purchase.

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c) Failure due to fire, earthquake, flood, lightning or other natural disaster; or
riot, war or the like.
d) Failure due to intrusion of foreign matter from piping.
e) Failure caused by a specific problem due to combination with other
incorporated equipment.
f) Other failures and damages which are considered not attributable to
KOFLOC.
Please be aware that the warranty shall not cover opportunity loss suffered
by you or your customer or damage to other equipment or any other damages
due to a failure of the KOFLOC product.
URL：http://www.kofloc.co.jp