jetec VN Series Small Size Electromagnetic Flowsensor Instruction Manual
- June 3, 2024
- JETEC
Table of Contents
Small Size Electromagnetic Flowsensor
Model VN Series
Handling Manual
VN Series Small Size Electromagnetic Flowsensor
Danger| Failure to follow instructions may lead to death or serious
injury.
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Warning| Failure to follow instructions may lead to injury.
Caution| Failure to follow instructions may lead to product damage
(Product malfunctions, etc.).
Precautions in use
Danger
- Do not use the VN Series for applications that requires safety, such as any nuclear, railroad, aircraft, vehicle, playground equipment, etc.
- Do not modify the VN Series.
- The VN Series is not designed to sanitary specifications. Do not use the product for drinks, foods, or medical liquids, etc.
- The VN Series is not designed to explosion-proof specifications. Do not use the product in an environment with flammable gas or something similar.
- Do not use the VN Series for corrosive liquids.
Operating environments・Liquid to be measured
Caution
- 20 seconds after supplying power to the VN Series is its start-up time. Do not use outputs from and the display of the flowsensor during this period.
Piping
Caution| 1. Do not use the VN Series at the place air bubbles enter or
for measurement of the liquid containing air bubbles. And, do not install the
flowsensor in the locations where air collects easily (Upstream side of a
downward elbow, etc.). After installation of the flowsensor, make sure to
perform sufficient air elimination before its operation.
2. Although installation position of the VN Series is free, to avoid
influence of air bubbles, dart, etc., we recommend the direction of
installation that LED seal-face is parallel to the ground or flow direction is
vertically upward.
3. In case a flow-regulating valve, etc., that causes turbulence of flow is
to be installed, its location must be at the downstream side of the
flowsensor.
4. Do not install the VN Series in the piping system to which impact
pressure, such as water hummer, is applied.
5. In case of new piping, install the VN Series after sufficient cleaning.
6. Arrange piping so that the flow direction conforms to the direction of the
arrow indicated on the flowsensor body.
7. Do not install the VN Series in locations where strong compressive force,
tensile force, or load is applied after its installation.
8. Make sure that sealing tape or adhesive agent does not protrude from the
threaded portion of piping.
9. For the upstream and downstream pipes just before the VN Series to which
the flowsensor is to be connected, ensure there is no fins, etc., of thread
machining exists at the edges and end-faces of the pipes.
10. Do not drop the VN Series, bang it against something, or apply excessive
force.
Handle the product by holding its body, not to hold its cable.
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Warning| 1. Regarding the tightening torque to piping, refer to the
value given below for the each the model, and do not apply higher torque to
the flowsensor than specified. The flowsensor’s connection thread portion(s)
may be damaged and the liquid inside the piping may leak consequently. Also,
2-3 times of wrapping with sealing tape is indispensable.
VN05R: 3.0±0.5Nm
VN10R: 5.0±0.5Nm VN20R: 12±1Nm
If leakage occurs although piping is done with the torque shown above, do not
perform additional tightening. Instead, check for flaws in the threaded
portion or sealing tape.
2. Do not install the VN Series in locations used as footholds.
Wiring
Danger| 1. Operating supply voltage of the VN Series is DC12～24V.
Connecting AC100V may cause fire.
2. At the time of wiring, ensure to follow instructions of this handling
manual to perform wiring.
3. Use the VN Series within the rated voltage range. Do not use the product
by applying excessive load that is over the allowable load.
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**Caution**| 1. Do not place the VN Series’ cable together with or near
to power supply lines or power lines, etc.
2. Isolate the VN Series’ cable as far as possible from any source of noise.
3. Electrical isolation of the power supply, a remote counter (a receiver),
etc., from others is recommended.
4. Do not apply excessive tensile force to the cable.
5. Ensure that the cable tip is not soaked in water during wiring work.
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Confirmation of the specifications
- Please confirm the descriptions on the upside of the packing box and on the backside of the flowsensor conform to the ordered specifications.
- As there are 2 channels of outputs, please also confirm the specification of the each of 1CH and 2CH is correct.
Wiring
- The wiring method is as the following diagram.
Is (Absorbing current of output) =
Pull-up voltage shall be not more than 30V, and Is (Absorbing current of
output) shall be not more than 20mA for the each.
LED display
- With 2-colors LED of green and red, either of flow-rate status or alarm information is displayed.
Alarm information by error detection has priority of indication. And, only the information that has the highest priority is displayed.
Green: Status of flow-rate is indicated with 4 patterns, which are
combination of 3 steps for flashing and lighting.
Red: Content of alarm (error detection) is indicated with 6 patterns that
are combinations of 4 steps for flashing, lighting, and No-light.
1. Flow information (Green)
- Flow-rate ranges and patterns of indications
| Flow-rate range | Patterns of indication |
|---|---|
| Less than zero-cut flow-rate | Continuous LIGHTING |
Zero-cut flow-rate ～ 1/3 of the upper limit of the accuracy guaranteed flow-
rate range| Flashing of 2 seconds cycle. Repeating of 1 second LIGHTING and 1
second of NO-LIGHT.
1/3 ～ 2/3 of the upper limit of the accuracy guaranteed flow-rate range|
Flashing of 1 seconds cycle. Repeating of 0.5 second LIGHTING and 0.5 second
of NO-LIGHT.
More than 2/3 of the upper limit of the accuracy guaranteed flow-rate range|
Flashing of 0.4 seconds cycle. Repeating of 0.2 second LIGHTING and 0.2 second
of NO-LIGHT.
2. Alarm information (Red)
- Details of the alarm items
| Name of alarm | Content |
|---|---|
| Excitation error detection | Electric current does not correctly flow through |
the excitation coil.
Memory error detection| Error of data at the memory is detected.
Low power voltage detection| Power voltage lower than 9.6V is detected.
No-water detection| The measuring pipe is not fulfilled with liquid to be
measured (Partially filled condition).
Excessive liquid noise detection| Condition that correct measuring is
obstructed because abnormal current is flown on the liquid to be measured, the
liquid contains air bubbles, etc.
Reverse-flow detection| Reverse flow (flow direction opposite to the arrow
shown on the flowsensor’s body), which flow-rate is more than the zero-cut
flow-rate point, is detected.
Excessive flow-rate detection| Not less than 25% excess from the upper limit
of the accuracy guaranteed flow-rate range is detected.
- Error detection items and patterns of indications
| Error detection item | Priority | Patterns of indication |
|---|---|---|
| Low power voltage detection | 1 | No-LIGHTING of the both green and red |
| Excitation error detection or Memory error detection | 2 | Continuous LIGHTING |
| No-water detection | 3 | Repeating of 1 time of 0.3 second LIGHTING and 2 second |
of NO-LIGHT
Excessive liquid noise detection| 4| Repeating of 3 times of 0.3 second
LIGHTING and 0.3 second of NO-LIGHT + 1.7 second of NO-LIGHT
Reverse-flow detection| 5| Repeating of 2 times of 0.3 second LIGHTING and 0.3
second of NO-LIGHT
Excessive flow-rate detection| 6| Repeating of 4 times of 0.3 second LIGHTING
and 0.3 second of NO-LIGHT
Warranty period
Period of warranty for the product is within 1 year from the date of
shipment.
Ver 2. (2007.2.26)
TEL:+886-4-23729418
FAX:+886-4-23724011
(40349)
www.jetec.com.tw
References
Read User Manual Online (PDF format)
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