Karman JKSL-80L, JKSL-160L Vortex System Flow-Rate Sensor User Manual
- June 3, 2024
- Karman
Table of Contents
Operation Manual for the
Vortex System Flow-Rate Sensor
JKSL-80L
JKSL-160L
Safety Precautions
The markings used in this operation manual and their meanings are as follows
WARNIN
| This indicates that misuse of the unit could have grave consequences such as
death, serious injury, or the like.
---|---
CAUTIO
| This indicates that misuse of the unit could lead to physical injury or
material damage to houses, household effects, and the like.
| This symbol indicates a prohibited action
| This symbol indicates a compulsory action, in accordance with the
instructions provided.
★ No part of this manual may be transcribed, in whole or in part, without the
written consent of us.
★ The contents of this manual are subject to change without prior notice.
★ Though the utmost care has been taken in the preparation of this manual,
errors or omissions may have been overlooked. Please contact us if you have
any questions or find any irregularities.
★ Any manual with missing pages or incorrect collating will be replaced.
Please contact your dealer.
WARNIN
If an abnormal situation or malfunction occurs, cut off the power supply!
Continued use of the unit in an abnormal or malfunction situation, such as one
in which smoke or an unpleasant odor is emitted or unstable operation occurs,
could result in a fire or other accident. In such a situation, cut off the
power supply immediately and contact your dealer. Under no circumstances
should the user attempt to repair the unit.
Handle the power cable with care
To avoid malfunctions and accidents, do not place heavy objects on the power
cable, keep it away from heat sources, and do not tug on the cable from the
sensor unit
Do not remove the display cover.
The display cover contains an electronic printed circuit board. Touching the
board could result in an accident or malfunction. Entrust your dealer with the
inspection, adjustment, and repair of the unit
CAUTION
When unpacking or carrying the unit:
When unpacking or carrying the unit, be very careful not to allow it to fall.
If the sensor unit falls to the floor, an accident or malfunction may result.
Note the following precautions regarding the location of the unit:
If the unit is used in a location with high humidity or heavy condensation,
moisture may form within it, which could lead to an accident or malfunction.
If used in a location where it will be exposed to magnetism, electromagnetic
rays, X-rays, or ultraviolet rays, the unit may suffer an accident or
malfunction.
If the unit is used in a location subject to high temperatures, such as near a
heater, the internal temperature of the unit may become too high, resulting in
an accident or malfunction. Use the unit under the specified operating
conditions.
If used in a location susceptible to heavy vibration, the unit may operate
improperly or suffer an accident or malfunction.
Do not insert fingers into the unit:
Exercise care, as injury may result if fingers are inserted into the sensor
units, such as during piping work.
When servicing the unit:
To ensure safety, cut off the power supply first. Failure to observe this
precaution could result in an accident or malfunction.
Features
- The digitized setting and adjustment allow set values to be saved in memory, and also ensure stable operation after power is supplied to the unit again.
- The LED display can be turned upside down using a single button, thus avoiding the inverted indication of numeric values after the piping work.
- Highly durable and maintenance-free. The lack of moving parts eliminates the problem of the generation of dust, enabling the fluid to be kept clean.
- While the unit can indicate flow rates, integrated values, and temperatures on the LED, it is also delivering the outputs at all times.
- As the primary output consists of a frequency output that is proportional to the flow rate, an integrated flow-rate value can be obtained directly.
- The adoption of an 8-bit microcomputer has enabled high-speed processing
Principle of operation
Figure 1 below shows a schematic diagram of the principle of operation. Let
the frequency of the vortex discharged on the downstream side of the pole
(Karman Vortex) be represented by f, and the dimensionless number (referred to
as the “Strouhal number”) by St.
Then, we obtain the following equation:
St is a function of the Reynolds number and remains nearly constant within a
certain range.
Therefore, f is proportional to V. When the flow rate is represented by Q and
the sectional area of the flow passage by A, the equation Q = AV holds true.
Therefore, V can be found by determining frequency f, and flow rate Q can be
measured through conversion.
Based on this principle, the flow sensor detects the frequency of the Karman
vortex generated from the pole by means of the beat plate, and subjects it
microcomputer processing.
< Figure 1> Diagram of the Principle of Generation of the Karman Vortex
Configuration
Cabling method
- AWM20276: This is a 9 core/0.16 mm2 1000 mm cable with no terminal processing.
- GND should be used as a common ground wire for all other signaling lines, except for the alarm lines.
Dimensional diagrams (mm)
The dimensions specified below are for the JKSL-80L; those of the JKSL-160L
are indicated in ( ).
Locations of machined mounting holes
The Karman Vortex System Flow-Rate Sensor is directly screwed into the piping.
Use the 4-f 4.5 holes located on the bottom surface to fasten the unit, as
necessary.
Operating method
The illustration below represents the display panel at the upper part of the
unit.
Outline of operation
When the unit is supplied with power, it indicates a flow rate by default;
specifically, it indicates a flow rate unconditionally (The unit has no power
switch.)
［Mode-change flow］
The sensor unit can measure the flow rate, integration, and temperature as the
corresponding switches are operated. The measurement results are output
through the interface cables and are displayed at the same time on the 3-digit
LED (green). The unit shifts from any status to the mode corresponding to the
switch depressed [①, ②, or ③].
Priority is given to the three modes: flow-rate indication, integration
indication, and temperature indication
If flow-rate indication mode is selecte
Pressing the Flow Rate switch (①) causes the LED display to flash and allows
the flow-rate alarm to be set. Pressing the Set switch (12) sets an alarm
value. Each time the Set switch is pressed, the value is increased; pressing
the Set switch ( ) while holding down the Flow Rate switch (①) reduces the
value. Press the Flow Rate switch (①) again after deciding on the desired
value; the flow-rate indication will be restored, indicating that the setting
has been confirmed. Follow a similar procedure for the integration and
temperature.
1. Setup of the flow rat
Supply DC power to the unit after connecting the interface cables (the JKSL
has no power switch, and connection of 24 V DC or 12 V DC starts up the unit);
the unit will start operating.
The moment the unit is supplied with power, it enters the flow-rate mode (by
default), and (④) lights up. If there is a flow (1 l/min. or larger), the
light flashes. Two seconds later, (⑩) and ( ) start up, indicating the fluid.
L denotes l/min., and the above illustration shows a flow rate of 23.6 l/min.
The overrange is 90 l (in the case of JKSL-80L) or 180 l (in the case of JKSL-
160L), with F being displayed in such a case.
Then, press ①; ⑩ will start flashing, indicating that the alarm setup has been
enabled. Pressing raises the threshold in increments. Press ① once again when
the target threshold value is reached. The threshold will be established, and
the flow-rate indication will be displayed.
Pressing ① while holding down lowers the threshold in decrements.
If the actual flow rate exceeds the threshold, ⑦ goes out and an alarm signal
to the cable is turned on. (The unit can also be shipped out with inverse
polarities.)
2. Integration mode
Although the unit enters the flow-rate mode the moment it is supplied with
power, pressing ②thereafter activates the integration mode. As ①, ②, and ③ are
priority switches, pressing any of them shifts the unit to the corresponding
mode. ⑤ comes on, and ⑩and indicate an integrated value.
⑩alternately displays the mantissa section (3 digits) and exponential section
(1 digit/0 to 3) of an integrated value (4 sec vs. 2 sec/in unit of •)
Example 1: When 256 L is indicated
256 (The mantissa section is 256
-E0 (The exponential section is 0.)
Example 2: When 365 × 10² L is indicated:
365 (The mantissa section is 365.)
-E2 (The exponential section is 2
In the case of Example 2, pressing ② allows the lower 2 digits to be viewe
Example 3: 48 – (12) pressed)
– : Space
Example 3 shows that the measured value is 36548 L
Pressing ②again allows an integration alarm to be set. The unit alternately
indicates the mantissa section (3 digits) and exponential section (1 digit, 0
to 3) by flashing (12 sec vs. 4 sec/•).
Example 4: When 2780 L is indicated:
278 (The mantissa section is 256.
-E1 (The exponential section is 1.
Example 4 shows that the threshold is 2780 L.
Pressing raises the threshold in increments. Pressing ②again when the
target value is reached establishes the threshold, and the integration
indication is displayed. Pressing while holding ② down lowers the threshold in
decrements. If the integrated value exceeds the threshold, ⑧goes out and an
alarm signal to the cable is turned on. (The unit can also be shipped out with
inverse polarities.) The threshold has no hysteresis. The maximum value is
999.999 l, and it is reset to 0 when exceeded. The integrated value can be
reset by the following two methods:
– Press while holding ②down in the integration mode.
– Momentarily connect RESET of the cable to the ground.
3. Temperature mode
Pressing ③shifts the unit to the temperature mode. As ①, ②, and ③are priority
switches, they shift the unit to the corresponding mode from any mode.
Specifically, pressing ③ activates the temperature mode unconditionally.
Pressing ③causes ⑩to flash and indicate a temperature alarm value. Pressing
raises the threshold in increments, and pressing ③sets it, displaying the
temperature indication at the same time.
The threshold can be set in a range from 0 to 99°C, but has no hysteresis. If
the water temperature exceeds the threshold, ⑨lights up. (The unit can also be
shipped out with inverse polarities.
◎ Over-range indication 99 (Over 99°C)
0 (below 0°C)
- The lighting and extinction of the alarms (④ to ⑨) can be defined at the factory prior to shipment, as mentioned above
MOS-FET
When comes [ON]: Actual value 3 target value: Green light on/red light off
When goes [OFF]: Actual value < target value: Green light off/red light on
4. Inversion of display
In any mode, the unit inverts ⑩and 11 when 13 is pressed. This feature makes it easy to view the display, according to the orientation in which the unit is mounted.
The illustration below represents a sticker placed on the side of the unit that explains how to set an alarm.
Circuit configuration
For data (flow rate/integration/temperature) indications, the signals transmitted from PT and PZT are processed by the microcomputer; LED1 shows the measurement data; LED5, 6, and 7 indicate the mode; and LED2, 3, and 4 produce the alarm indications. The mode switchover is performed using SW1, SW2, or SW3 for the flow rate, integration, or temperature, respectively, and LED1 displays the alarm value. Its setup is performed via SW4, and the display inversion is performed using SW5. The alarm signals consist of open-collector outputs, which are delivered to the cables (FALM, SALM, TALM)
The Karman vortex is detected by the PZT (piezoelectric element), and the
signal is processed by the microcomputer to be finally output at the specified
level (0 to 10 V, 4 to 20 mA, or pulse output) through the interface cables.
The unit also performs the integration of flow rates during signal processing.
The water temperature is detected by the PT (temperature-detecting platinum
element). After the signal is processed by the microcomputer, its level is
raised to the specified value, simultaneously with the flow-rate output, and
then output at TOUT. <Table 1> explains the specifications to be decided on at
the factory prior to shipment. The supply voltage, specified levels of the
cables, alarm polarities, and integrated values of the maximum flow rates are
fixed at the factory prior to shipment.
< Table 1>
| Item | Symbol | Type | Remarks |
|---|---|---|---|
| Supply voltage | VCC | 24V | Choice of two |
12V
Flow-rate output| AOUT| 0∼10y| Choice of three
4∼20mA
Pulse output
Temperature output| TOUT| o∼lov| Choice of two
4∼20mA
Alarm output| TALM| ON output| Choice of two
OFF output
Max. flow rate| –| MAX 80L| Choice of two
MAX 160L
Interfaces
The table below shows the input and output interface lines available to the
user.
- The choice in Output Selection is set to one of the characteristics at the factory
| Symbol | Color | Designation | Direction | Characteristic | Output Selection | Usage |
|---|---|---|---|---|---|---|
| VCC | Red | Power Supply | JKSL←Equipment | DC24V±10% | Choice of two | DC power is |
supplied from the equipment. The current flows to the unit the moment it is
connected, as the KSL has no power switch.
DC12V±5%
GND| Black| Ground| JKSL←Equipment| | | Common ground line. This single line
serves as a common return for all other lines, including power supply.
AOUT| White| Flow-rate output| JKSL←Equipment| 0~10V| Choice of three| The
flow rate is converted into an electric signal, which is sent to the equipment
side
4~20mA
Pluse output
TOUT| Orange| Temperature detection output| JKSL←Equipment| 0~10V| Choice of
two| The water temperature is converted into an electric signal, which is sent
to the equipment side.
4~20mA
RALM| Yellow| Flow-rate alarm| JKSL←Equipment| MOS-FET(ON)| Choice of two| The
flow-rate alarm is reported to the equipment side.
(A): ON when flow rate > threshold (B): ON when flow rate < threshold
MOS-FET(OFF)
SALM| Brown| Integration alarm| JKSL←Equipment| MOS-FET(ON)| Choice of two|
When the integrated value exceeds the threshold, it is reported to the
equipment side. (ON): ON when integrated value > threshold (OFF): ON when
integrated value<threshol
MOS-FET(OFF)
TALM| Green| Temperature alarm| JKSL←Equipment| MOS-FET(ON)| Choice of two|
When the temperature exceeds the threshold, it is reported to the equipment
side.
(ON): ON when temperature > threshold (OFF): ON when temperature < threshold
MOS-FET(OFF)
SRESET| Blue| Integration reset| JKSL←Equipment| | | The integrated value is
reset from the equipment side (the count restarts from 0).
COM| Gray| Alarm common| JKSL←Equipment| | | Common return circuit of FALM, →
TALM, and SAL
Connecting the load
-
When operating the unit under a relay load, use a diode (D) to prevent breakdown of the transistor due to a counter-electromotive force. (Example: V03C (Hitachi))
-
The unit is shipped out with the COM terminal open or grounded
(depending on the model and order). On a product with the COM terminal grounded, there is continuity between COM and the black cable. -
When COM is open:
Sides A and B can be connected with either polarity, positive or negative, if
the voltage is within 40V.
Input and output signal
Flow-rate characteristics
The flow-rate characteristics are temperature-dependent, as can be gathered
from the figure below.
To maintain accuracy, secure a straight-pipe length of 7D or more on the
upstream side, and 5D or more on the downstream side. Moreover, be sure to
install valves, branchings, gauges, etc. on the downstream side.
Caution
-
Content set forth in this operation manual may be altered without a prior notice because of improving or enhancing specification of the flow sensor.
When apply ing the flow sensor , mak e sure to use the updated edition of the operation manual. -
An outline of the movement and specification of the flow sensor is to be ex plained in this operation manual as conforming to its standards. W hen apply ing it, care must be tak en to use the sensor appropriately with a proper instrumental design only after due consideration against ex ternal conditions.
-
As to A pplication Condition：
Be sure thet the flow sensor must be applied within the condition of max imum applicable pressure, fluid temperature and / or environmental temperature as specified in the terms of ” U sing Condition ” in this operation manual. -
As to E lectric W iring：
Never fail to strictly observe the content set forth in each item of ” E rectrical Charateristics” such as loading condition of relay output , tolerance of power supply voltage and so forth. Care must be tak en not to cause an anti-polarity contact of the power supply and short-circuit of the output. -
W e are not responsible for any or all failure and/ or accident resulting from misuse or unsuitable usage of the flow sensor. Strictly observe every instruction item set forth in this operation manual.
-
It is not allowed to reprint and/ or reproduce a part or all of the operation manual without a prior permission by us.
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