Related Manuals for Nohken VQ20-R00
Summary of Contents for Nohken VQ20-R00
- Page 1 ＴＳ０２－１０００１５ ＩＮＳＴＲＵＣＴＩＯＮ ＭＡＮＵＡＬ TUNING FORK LEVEL SENSOR MODEL: ＶＱ２０ Revision 2020-01-08...
- Page 2 Bef ore handling the equipment, read this manual caref ully. ・ Instructions in documents submitted by Nohken or its repr esentative have higher pr iorit y than t hose in this manual.
- Page 3 Do not alter or disassemble the equipment, unless you have been instructed to do so by Nohken or its repr esentative. Failur e to obser ve this may result in: - malf unction of or damage to the equipm ent or connected devices;...
- Page 4 CAUTION Check caref ully f or chemical compatibi lit y of materials of construct ion bef ore installat ion. Use the f lange, thread or somewhere close to the process connection to handle the equipment. Do not use the terminal box (housing) to avoid dropping the equipment, and resultant damage to the equipment or user inj ur y.
- Page 5 (1) year from the date of original shipment from Nohken’s factory. B) Nohken will not assume liability for loss nor damage resulting from the use of the equipment. C) Nohken will not assume liability for damage resulting from: C-a) not observing instructions in this manual;...
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Page 6: Table Of Contents
Table of Contents 1.PURPOSE OF USE …………………………………………… 2.DESCRIPTION …………………………………………… 2.1 Product Overview …………………………………………… 2.2 Principle of Operation …………………………………………… 3.SPECIFICATIONS …………………………………………… 3.1 Model Numbering …………………………………………… 3.2 Specifications …………………………………………… 3.2.1 Common …………………………………………… 3.2.2 Model specific …………………………………………… 3.3 Outline Drawing …………………………………………… 4.HANDLING NOTES ……………………………………………... -
Page 7: Purpose Of Use
1. PURPOSE OF USE Tuning Fork Level Sensor VQ is designed to measure material level in a tank or piping. Do not use it for any other purpose. 2. DESCRIPTION 2.1 Product Overview VQ is a compact level sensor ideal for integration into machinery. Wetted parts, the fork and process connection, are in 316L stainless steel to offer high corrosion resistance. -
Page 8: Specifications
3.2 Specifications 3.2.1 Common Name Tuning Fork Level Sensor Model VQ20 VQ20 VQ20 VQ20 VQ20 VQ20 VQ20 VQ20 -R□0 -R□X -F□0 -F□X -F□0E -F□XE -S□0B -S□XB Measured material Liquids Operation Specific gravity 0.6 to 2.0 Viscosity 0.2 mPa・s to 10 Pa・s Switching point (water) approx. -
Page 9: Model Specific
3.2.2 Model specific (1) 2 wire Model VQ20 VQ20 VQ20 VQ20 VQ20 VQ20 VQ20 VQ20 -R00 -R0X -F00 -F0X -F00E -F0XE -S00B -S0XB Operating characteristics LED (red) operation - Lights continuously - 1 flash per 3 seconds delay - 7 flashes per second overload - 3 flashes per second twice, and then goes out for 1 second error... - Page 10 (3) Relay Model VQ20 VQ20 VQ20 VQ20 VQ20 VQ20 VQ20 VQ20 -R20 -R2X -F20 -F2X -F20E -F2XE -S20B -S2XB Operating characteristics LED (red) operation relay energized - Lights continuously relay de-energized - 1 flash per 3 seconds delay - 7 flashes per second error - 3 flashes per second for 5 times, and then goes out for 1 second...
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Page 11: Outline Drawing
3.3 Outline Drawing ① Window for LED – to check operation status by LED ② Cover ③ Cable inlet (G1/2, 11mm deep) ④ External earth terminal (M4) ⑤ Housing ⑥ Threaded connection ⑦ Fork – detects material presence/absence ⑧ Flange ⑨... -
Page 12: Handling Notes
4. HANDLING NOTES Observe instructions below when handling the sensor, or faulty operation or user injury may result. (1) Lay the sensor on a flat surface. Do not stand it to prevent it from falling. Support the sensor with wood piece to avoid rolling, or bent or damaged fork. -
Page 13: Installation
5. INSTALLATION WARNING This sensor is not intended for use in hazardous areas . Never use it in areas where flammable or explosive gases or vapors may be present. 5.1 Unpacking (1) Open the packaging and take out the sensor. Check against nameplate that the sensor is what you have ordered. -
Page 14: Mounting
5.3 Mounting Align the fork gap with the flow direction. Use the markings when orienting the sensor. 5.3.1 Threaded version Use a tool to mount the sensor. Hexagon on the thread is of 41mm A/F. Fig. 5-3 5.3.2 Flanged version Place the sensor flange on the tank flange, and secure them using a suitable tool and bolts according to the applicable standards. -
Page 15: Handling Notes
5.4 Handling Notes CAUTION Never alter the sensor in any way to avoid faulty operation or damage. (Fig. 5-6) Do not give a shock to the sensor to avoid faulty operation or damage. Ensure the fork protrudes into the tank or piping. Otherwise faulty operation may result due to for example the sensor erroneously reading buildup. - Page 16 (1) For horizontal mounting, orient the sensor as shown. Make sure the marking on the hexagon faces upwards or downwards. Fig. 5-11 CAUTION Incorrectly mounted sensor causes sticky material to remain on the fork. This may cause faulty operation. (2) On piping, mount the sensor as shown in Fig. 5-12. Incorrectly mounted sensor may cause cavitation between the tines (Fig.
- Page 17 (4) Fig. 5-14 shows mounting examples. Fig. 5-14 CAUTION Allow clearance of at least 13mm between the fork tip and the tank/pipe wall. Otherwise faulty operation may result under high flow conditions. (5) In sticky material applications, response to wet-to-dry may be slower. Response to dry-to-wet will not be affected.
- Page 18 (7) Ensure that the fork protrudes into the tank or piping. Otherwise faulty operation or slower response may result with sticky material, causing the pump to run dry. (Fig. 5-15) The fork must protrude for at least 27mm in any cases including small piping, and 13mm of clearance between the fork tip and the piping wall must be ensured.
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Page 19: Wiring
6. WIRING WARNING Disconnect power before wiring, or electric shock may result. Ignition or short circuit may also result due to leakage or charged components contacting each other. Do not startup sensors with fault in protective functions such as protective earth or fuse. Ensure correct voltage to avoid damage to the sensor or human injury. -
Page 20: Wiring
6.1 Wiring 6.1.1 Cable Strip the cable tip for 6mm. The sensor accepts conductor size of up to 2.5mm Use cable with 0.75mm conductor to jumper terminals. Terminal screws have a combination head. Use a slotted screwdriver of 0.6 x 3.5mm, or another suitable screwdriver. -
Page 21: Wiring
6.1.3 Wiring Properly connect the wire to the terminals. Use a screwdriver to ensure proper wiring. Observe torque values below. Torque: 0.4 to 0.5N・m for terminals, 1.2N・m for protective earth (1) VQ20-□0□ CAUTION When connecting to a relay whose current rating 12mA or lower, reset current 5mA or lower, use a resistor in parallel with the load (bleeder resistor). - Page 22 [Bleeder resistor] If connecting VQ20-□0□ to a relay whose rating 12mA or smaller, or reset current(*1) 5mA or smaller, use a bleeder resistor. *1 reset current = rated current of relay [mA] x breaking voltage [%] x 0.01 1. Select a resistor that satisfies the following two formulae. (Ira x Vrel x 0.008) …...
- Page 23 (2) VQ20-□1□ CAUTION Always connect a load between OUTPUT 1 and 24V DC+, and between OUTPUT 2 and 24V DC-, or over current will damage the sensor. When connecting to a relay, use one with a protection circuit or add a surge absorber to protect the sensor from reverse voltage.
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Page 24: Cable Inlet
(3) VQ20-□2□ CAUTION When connecting to a relay, use one with a protective circuit or add a surge absorber to protect the sensor from reverse voltage. Fig.6-4: wiring - VQ20-□2□ 6.2 Cable Inlet Cable inlet is of G 1/2 or equivalent size and 11mm deep. Secure the cable by tightening the gland with a suitable tool when a cable gland is used, and using sealing compound when a conduit is used. -
Page 25: Placing The Cover
6.3 Placing the Cover Remove dust or debris from inside the housing, and then place the cover. Hold the sensor by the housing, and rotate the cover. Keep rotating after you feel resistance until the markings on the cover and the housing are in line. The markings not in line means the cover is not properly tightened, and water or dust may enter and cause corrosion or short-circuit. -
Page 26: Adjustment
7. ADJUSTMENT CAUTION 2 wire version (VQ20-□0□) may instantly change its output states at power-up. Ensure this does not adversely affect connected devices. Set the operation mode and the delay timer to suit your application. 1) Operation mode Fail-safe switch (FS) determines the operation mode. The sensor offers two modes, “H” and “L”. Figure 7 and Table 7-1 show the detail. - Page 27 Table 7-2: Delay timer Delay switch ON delay time OFF delay time approx.0.5 to 30 sec. approx. 0.3 sec. approx. 0.3 sec. approx. 0.5 to 30 sec. Turn the trimmer clockwise to lengthen, and counterclockwise to shorten the delay duration. Use a suitable tool to rotate the trimmer. The slot dimensions are as shown.
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Page 28: Maintenance And Inspection
8. MAINTENANCE AND INSPECTION Maintain the sensor periodically. (1) Check for damage such as corrosion and deformation. (2) Remove buildup on the fork. (3) Remove condensation, dust, or metal particle in the housing. (4) Ensure proper wiring. If loose, tighten the terminal screws with a screwdriver. (5) Replace corroded terminals and wire. -
Page 29: Troubleshooting
10.TROUBLESHOOTING See section 10.1 if the sensor reports a false dry condition. See section 10.2 if the sensor reports a false wet condition. If error persists, the sensor may be damaged and replacement required. Please contact our sales office. 10.1 False Dry Report Problem Possible cause Corrective action... -
Page 30: Glossary
11.GLOSSARY Terms used in this manual are listed below. Those that have already been defined earlier in this manual are not included. Detection element. Keeps oscillating during operation, and the Fork change in oscillation frequency indicates material presence or absence. Element that creates strain. - Page 31 OSAKA HEAD OFFICE : 15-29 Hiroshiba-cho, Suita, Osaka 564-0052, Japan TEL: 81-6-6386-8141 FAX: 81-6-6386-8140 TOKYO HEAD OFFICE : 67 Kandasakumagashi, Chiyoda-ku, Tokyo 101-0026, Japan TEL: 81-3-5835-3311 FAX: 81-3-5835-3316 NAGOYA SALES OFFICE: 3-10-17 Uchiyama, Chikusa-ku, Nagoya, Aichi 464-0075, Japan TEL: 81-52-731-5751 FAX: 81-52-731-5780 KYUSHU SALES OFFICE: 2-14-1 Asano, Kokurakita-ku, Kitakyushu, Fukuoka 802-0001, Japan TEL: 81-93-521-9830...
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