What to do if the LED flashes 3 times per second for 5 times and then goes off for 1 second on Nohken VQ20-R00 Accessories?
If the LED on your Nohken Accessories flashes 3 times per second for 5 times and then goes off for 1 second, it indicates that the sensor is damaged. A replacement is required, so it is recommended to contact our sales office.
Why does the LED stay ON and output indicates dry with fail-safe switch set to “H” on Nohken Accessories?
If the LED on your Nohken Accessories stays ON and the output indicates dry with the fail-safe switch set to “H”, the cause may be related to terminal screws or cabling issues. Ensure that you tighten the terminal screws and check that the cabling is not damaged.
Why does the LED stay ON and output indicates wet with fail-safe switch set to “L” on Nohken Accessories?
If the LED on your Nohken Accessories stays ON and the output indicates wet with fail-safe switch set to “L”, the cause may be related to terminal screws or cabling issues. Ensure that you tighten the terminal screws and check that the cabling is not damaged.
What to do if the LED flashes 3 times per second twice and then goes out for 1 second on Nohken Accessories?
If the LED on your Nohken Accessories flashes 3 times per second twice and then goes out for 1 second, it means that there is no load connected (2 wire, VQ20-?0?). To solve this, wire it correctly.
What causes the LED to flash every 3 seconds with fail-safe switch set to “L” on Nohken Accessories?
If the LED on your Nohken Accessories flashes every 3 seconds with the fail-safe switch set to “L”, it indicates buildup on the fork. Remove the buildup and mount the sensor correctly.
Why does the LED flash every 3 seconds with fail-safe switch set to “H” on Nohken VQ20-R00?
If the LED on your Nohken Accessories flashes every 3 seconds with the fail-safe switch set to “H”, it means that the fork is not covered by material. Relocate the sensor so that the fork will be covered by material.
How to fix LED when it stays OFF on Nohken VQ20-R00?
If the LED on your Nohken Accessories stays OFF, it is likely due to incorrect wiring. Make sure to wire it correctly.
Defines warning, caution, prohibited, and mandatory action symbols used in the manual.
Prohibits use in potentially hazardous areas due to ignition risk.
Warns against unauthorized alteration, disassembly, and impacts.
Emphasizes turning off power before wiring and checking connections.
Instructs immediate shutdown upon noticing smoke, unusual smells, or sounds.
Stresses checking chemical compatibility of materials before installation.
Advice on using flanges/threads for handling and connecting the protective terminal to ground.
Recommends using arrestors or surge absorbers for protection.
Describes the VQ sensor as a compact, corrosion-resistant level sensor with a window.
Explains how the piezo-electric crystal and fork oscillation detect material level changes.
Covers measured material, specific gravity, viscosity, working temperature, and humidity.
Details wetted parts, housing materials, process connections, and protection classes.
Illustrates outline drawings and key dimensions for different VQ20 sensor models.
Instructions on laying sensors, avoiding corrosive atmospheres, and protecting against vibration.
Guidance on preventing shocks to the fork and respecting housing rotation limits.
Steps for unpacking, verifying the sensor, and checking for visible damage.
Details on setting the switching point for vertical and horizontal mounting.
Instructions for installing the sensor using a threaded connection.
Instructions for installing the sensor using a flange connection.
Instructions for installing the sensor using a clamp for sanitary connections.
Warnings against altering the sensor or subjecting it to shocks to prevent damage.
Ensuring correct fork protrusion and managing material buildup for accurate operation.
Guidance on using tools for mounting threaded versions and avoiding holding by the housing.
Advice on avoiding proximity to inlets, agitators, or high flow/bubble sources.
Correct orientation for horizontal mounting, ensuring marking alignment.
Proper mounting in piping to avoid cavitation and ensure correct operation.
Instruction to avoid bubbles which might be erroneously detected by the sensor.
Ensuring minimum clearance between the fork tip and tank/pipe wall for proper operation.
Notes on slower response for wet-to-dry switching with sticky materials.
Recommendation to periodically remove material buildup from the sensor.
Ensuring sufficient fork protrusion into tanks or piping for accurate readings.
Guidance on rotating the housing and preventing water or moisture penetration.
Critical safety warnings regarding power disconnection, fault conditions, and correct voltage.
Guidelines for selecting cabling, connecting earth terminals, and using surge absorbers.
Advice on not exceeding load ratings and minimizing induction from power lines.
Instructions on preparing cables and connecting them to terminal blocks.
Identifies terminal blocks, switches (FS, DELAY), TEST button, LED, and protective earth.
Detailed wiring diagram and specific precautions for the 2-wire VQ20-0 model.
Warnings regarding bleeder resistors, protection circuits, and direct PLC connections.
Provides formulae for calculating resistance and power rating for bleeder resistors.
Lists recommended bleeder resistors from different manufacturers and their ratings.
Detailed wiring diagram and specific precautions for the 3-wire VQ20-1 model.
Detailed wiring diagram and specific precautions for the relay output VQ20-2 model.
Details on the cable inlet size and depth.
Instructions for securing cables using glands or conduits and preventing water entry.
Procedure for placing and rotating the cover to ensure proper sealing and alignment.
Warnings about rotating the cover and potential damage to internal components.
How to set the sensor's operation mode using the Fail-safe switch (FS).
Setting the delay timer using the DELAY switch and DELAY TIME trimmer.
Details on ON delay and OFF delay times based on the DELAY switch setting.
Instructions on how to adjust the delay duration using the trimmer.
Explains sensor output behavior based on fail-safe and delay switch settings.
Routine checks for damage, buildup, wiring, and terminals.
Using the TEST button for loop checks and understanding its effect on operation.
Recommended storage conditions and precautions for protecting the sensor.
Identifies problems, causes, and corrective actions for false dry reports.
Identifies problems, causes, and corrective actions for false wet reports.
General| Brand | Nohken |
|---|---|
| Model | VQ20-R00 |
| Category | Accessories |
| Language | English |
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