Kofloc FM31 Series User manual

MJ400208C1
Small Plastic Karman Vortex Flow Meter
FM31 Series
Instruction Manual

MJ400208C1
■Checking the product
FM3101/3102/3103/3104 are shipped after they have been inspected thoroughly at
Kofloc. When you have received the product, please check the following:
1. Check the appearance for damage.
2. The type name, basic specifications and product No. are shown on the nameplate
attached to the top of the case.
Make sure the specifications are as ordered.
■Precautions for handling
Ⅰ. Storage
(1) The product must be stored in a place that satisfies the following conditions:
・A place not exposed to rain and water.
・A place not exposed to vibration and impact.
・A place of the following temperature and humidity. Normal temperature and
humidity (about 25℃and 65% RH) are preferable.
Temperature: -10 to 60℃
Humidity: 5 to 95%RH
・A place not filled with corrosive gas.
(2) The product should be stored in the package in which the product has been received.
(3) To store the flow meter with fluid remaining in the tube hole after use, be sure
to clean it thoroughly before storing it.
Ⅱ．Installation Place
Observe the following precautions to ensure that the flow meter is used safely and
accurately over a long period of time:
(1) The applicable fluid of the flow meter is liquid. Use industrial water equivalent to pure
water and tap water.
(2) Do not use the flow meter under direct sunlight or in a place where it is exposed to
radiant heat. If the flow meter needs to be used in such environment, provide sufficient
shielding and insulating measures.
(3) Do not install the flow meter in corrosive gas atmosphere.
(4) This flow meter is of splash-proof structure (JIS C 0920), but it must be kept protected
from rain and water.
(5) Install the flow meter in a place free of vibration and impact.
(6) If the flow meter is installed near electromagnetic noise sources, the meter may
malfunction. Either install it away from such sources or provide magnetic shields.
(7) Provide a straight tube as long as possible to avoid influence of turbulent or pulsating
flow.
The recommended straight tube length is 10D or over for the upstream and 5D or over
for the downstream.
D = Diameter of piping
(8) Match the flow direction with the arrow direction marked on the body.

MJ400208C1
Ⅲ．Caution and Warning
(1) Do not apply water pressure exceeding the specified level. Do not clean the flow meter
with reverse flow. Such practices may damage the sensor portion and the flow meter
may fail.
(2) If fluid to measure in the tube hole is frozen, the sensor portion may be destroyed. If
fluid is likely to be frozen, provide heat insulation measures.
(3) FM31 Series meters are made of resin including the thread portions. Do not apply
excessive tightening force nor unnecessary external force when installing them.
(4) Do not hold the output cable when carrying the flow meter. The cable-to-electronic
circuit soldered connection may be broken.
(5) Protect the circuit of the flow meter from dew condensation.
Ⅳ．Insulation Resistance and Dielectric Strength Tests
Never conduct insulation resistance and dielectric strength tests since such tests may
damage the electronic circuit.
■Warranty
Ⅰ. Contents of Warranty
①Warranty period
The warranty period shall be one (1) year after shipment from Kofloc.
②Scope of warranty
Should the product fail for reasons attributable to Kofloc during the warranty period,
Kofloc will, at its option and expense, provide a replacement product or repair the
failed product at the Kofloc factory free of charge.
Please note that Kofloc shall not be held responsible for damages caused by reasons
not attributable to Kofloc and the customer’s opportunity loss, lost profits, secondary
disaster, compensation for accidents and damage to products other than the Kofloc
product and other compensation for reasons attributable to failure of the Kofloc
product.
③Out of warranty
The warranty shall not apply to the following failures even if they occur during the
warranty period:
a) Failure due to misuse or improper repair or modification. (Failure resulting from
use under conditions deviating from the manufacturing specifications included.)
b) Failure due to dropping of the product after purchase.
c) Failure due to a fire, natural disaster such as earthquake, flood and lightning and
riot, war or the like.
d) Failure due to intrusion of foreign matter through piping.
e) Failure caused by a specific problem attributable to a combination with other
equipment incorporated.
f) Other failures which are considered not attributable to Kofloc.
Kofloc shall not be held responsible for opportunity loss, damage to
products other than the Kofloc product at the customer or customer’s
client and other compensation for reasons attributable to failure of the
Kofloc product.

MJ400208C1
１．Overview
The FM31 Series vortex flow meter measures the flow velocity (vortex) of liquid (water)
running through the tube hole, detects a vortex frequency proportional to the flow velocity
and then outputs 4 to 20 mA from the processing circuit.
This is a small plastic vortex flow meter, where
the flow velocity and the flow rate have a certain
relationship in a wide range of use, and outputs
as follows; 0.4 to 4 L/min. for FM3101, 2 to 20
L/min. for FM3102, 5 to 50 L/min. for FM3103
and 10 to 100 L/min. for FM3104.
This flow meter has no movable parts and its
pressure loss is small. The output signals are
proportional to the volume flow rate. It offers
excellent linearity and reproducibility.
PFA (all Teflon) is used for the body to secure
mechanical strength and high reliability. Its
simple structure causing little liquid
accumulation ensures maintenance-free service,
requiring no periodic servicing and check.
２．Standard Specifications
■Main specifications
Item
Specification
Fluid
Liquids such as ultrapure water and drug solution
Material
Body: PFA, Cover: PBT
Output cord: Conductor = Tinned bare copper wire
Sheath = Heat-resistant/cold-resistant PVC
Accuracy
±3%+1digit
Reproducibility
±0.5%F.S. max.
Max. working pressure
1MPa(10kgf/cm2)
Fluid temperature
0-90℃
Ambient temperature
0-5
Power supply voltage
12-24VDC
Output
4-20mADC,3-wire
Load resistance
0-250Ω(250-500Ωwhen 24VDC)
Time constant
1 second
Waterproof
Splash-proof structure (JIS C 0920)
Cable length
2 m terminated (pre-soldered)
Weight
Without indicator: about116g (FM3101)
With indicator: about182 g (FM3101)
Principle of
measurement
Vortex generator
Vortex detector
Karman’s vortex
Piezoelectric element

MJ400208C1
■Model, diameter, flow measuring range and connection
Model
Diameter
Flow Measuring Range
Connection
FM3101
L
Low flow: 0.4 –4 L/min
3/8“ (tube end)
FM3102
M
Medium flow: 2–20 L/min
1/2“ (tube end)
FM3103
H
Large flow: 5 –50 L/min
3/4“ (tube end)
FM3104
H
Large flow: 10 –100 L/min
1“ (tube end)
３.Wiring Diagram

MJ400208C1
４．External View
Without indicator
Made in Japan
KOFLOC CORP. KYOTO 610-0311 JAPAN
261258
READ IM MJ4XXXXX
FM0101-SP-PN/K 0.5 - 4.0L/min PULSE 12-24VDC 0.5W XXXXX
MODEL
RANGE
OUTPUT
SUPPLY
No.
With indicator
Made in Japan
KOFLOC CORP.
KYOTO 610-0311 JAPAN
261258
READ IM MJ4XXXXX
FM3101-SD-XP/K
0.4 - 4.0L/min
4-20mA
12-24VDC
XXXXX
MODEL
RANGE
OUTPUT
SUPPLY
No.

MJ400208C1
５．Permissible Range of Use
Allowable fluid temperature－Allowable ambient temperature
0
10
20
30
40
50
60
0
10
20
30
40
50
60
70
80
90
100
Fluid temperature［℃］
Ambient temperature[℃]
Permissible range of use

MJ400208C1
６．Alarm Setting
（Setting example）
Press SET
（Setting）
Press SET
for about 2 sec.
Measurement mode
AL1 polarity
setting mode.
Press ▼ or ▲
to select mode.
Press SET.
AL1 polarity setting completed.
AL1 set value setting mode.
Press ▼or ▲
to set value.
Press SET.
AL1 setting completed.
AL2 polarity setting mode.
Press ▼or ▲
to select mode.
Press SET.
AL2 polarity setting completed.
AL2 set value setting mode.
Press ▼or ▲
to set value.
Press SET.
AL2 setting completed.
Write in EEPROM.
About 2 sec
Similar operation
for AL2
1-P: ON when flow rate is above set value.
1-n: ON when flow rate is below set value.
1-F: Normally OFF.
2-P: ON when flow rate is above set value.
2-n: ON when flow rate is below set value.
2-F: Normally OFF.

MJ400208C1
７．Other Setting
Press SET.
Type setting completed.
Output zero setting mode
Press ▲or ▼to set ammeter
output value when analog
output is zero.
Press SET.
Connect ammeter
(or corresponding resistor/
voltmeter)to analog output line.
Output zero setting completed.
Output span setting mode
Press ▲or ▼to set ammeter
output value when analog
output is FS.
Press SET.
Press SET and ▲
simultaneously for about 2 sec.
Flow unit setting mode
Press ▲ or ▼ to select
and set GAL or L.
Press SET.
Flow unit setting completed.
Type setting mode
Press ▲ or ▼ to set type.
Measurement mode
Press ▲or ▼to set ammeter
output value when flow is
100% FS.
Press SET.
Output span setting completed.
Flow span setting mode
Flow span setting completed.
Write in EEPROM.
Set on actual flow device and
let fluid flow in amount
equivalent to 100% FS.

MJ400208C1
(1) Setting the flow unit
Press for about 2 sec.
Press either key.
Press either key.
Press SET →Set
Switched
over
alternately
(L/min)
(gal/min)
(2) Setting the output zero
Press either key
to set 4 (mA).
(Example)
L range
*Let fluid of FS rate flow
with actual flow device.
(3) Setting the output span
(4) Setting the flow span
Press either key
to set 20 (mA).
Press either key to set
actual flow (FS value).
Displayed
alternately.
Displayed
alternately.
Displayed
alternately.

MJ400208C1
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