Operating Instructions Ring-21 Compact Liquid Level Switch

SHENZHEN JIWEI AUTOMATION LTD. www.jiweimeter.com

1 Introduction 1.1 Brief description Ring-21 is an economical compact tuning fork liquid level switch. It is designed with a compact and lightweight structure, with only 38 mm long of the fork body while the total length is only 160.5 mm, and the maximum diameter is about only 31.5 mm. Ring-21 can be applied to the level measurement of vessels and storage tanks under difficult conditions. It is not only suitable to use in foams, air bubbles, viscous liquid and conditions with complex vibrating interference, but also particularly suitable to be installed in small containers and tanks with constricted...

2.2 Characteristic (1) Economical pricing with lightweight compact design. Total length is only 160.5mm, the maximum diameter is 31.5 mm and the length of fork body is just 38mm. (2) Especially suitable to measure in pipelines and constricted spaces. (3) Measurable liquid’s density is as low as 0.7g/cm³ . (4) Cost-effective and high cost-performance ratio. (5) Strong anti-interference feature, can work in foams, air bubbles, viscous liquid and conditions with complex vibrating interference. (6) Based on the detection of vibration frequency changing of fork body, the measurement has high reliability....

3.4 Filling openings As Figure 3 shown, when choosing mounting position, avoid mounting Ring-21 at filling openings, in order to prevent measurement error, even instrument damage caused by material impact, it should be mounted in such a way that the tuning fork does not protrude directly into the filling stream Fig.3: Avoid mounting at filling opening 3.5 Pressure/Vacuum The process fitting must be sealed if there is high pressure or low pressure in the vessel or pipeline .Before mounting, please check if the seal material is suitable for the existing process conditions such as process pressure...

4.2 Connection cable In general, Ring-21 uses general cable with round cross-section. To ensure its sealing effect, outer diameter is 4.5-8mm. If you are using cable with a different diameter or cross-section, please use matched cable bolt, and be aware of changed cable’s sealing ability. 4.3 Wiring diagram Please wiring safely according to following diagrams. Figure 5, 6 and 7 is the wiring plan for M12×1. Figure 8, 9 and 10 is the wiring plan for the connector of solenoid valve.    ⚫  Note: The cable fitting of M12×1 is not equipped with Ring-21 normally. Client can choose the right cable...

5 Set up 5.1 Modes switch For overfill protection and dry run protection, it should be combined with the practical requirements of the occasion to adjust mode switch (High/Low). Proceed as follows: (1) Use screwdriver to unscrew partial screws on housing. (See Fig. 12) (2) Use straight screwdriver to rotate the electronic potentiometer clockwise to the end, so the instrument is in “High” mode. (See Fig. 13) (3) Use straight screwdriver to rotate the electronic potentiometer counterclockwise to the end, so the instrument is in “Low” mode. (See Fig. 13) (4) After setting the mode, please screw...

Installation location Switching status Signal lamp Relay de-energized Note: Above figures are as default setting, K is the common point, O is normally-closed contact, C is normally-opened contact. You also can customize your required form for normally-closed contact and normally-opened contact. Table 2 lists the PNP output signal corresponding to the level status. Table 2 PNP output Installation location Output Current Signal lamp （High） Overfill protection （High） Overfill protection Safety note: When testing the function of Ring-21, do NOT hold the fork body by hands, it may distort the fork...

jiwei -itfiJg&fk-- 6 Fault analysis and maintenance 6.1 Fault analysis The operator of the instrument is responsible for taking suitable inspections to rectify faults. Ring-21 offers high quality and reliability. Nevertheless, faults may occur during operation. These may be caused by the following: • Electronics module • Voltage supply • Installation location • Vibrating fork body When faults occur, the first inspection to be taken is to check the output signal. In many cases, the causes can be determined this way and the faults rectified. See Table 3 as reference. Table 3 Fault analysis Depending...

jiwei -itfiJg&fk-- Instrument weight 250g Measuring frequency approximate 1100 Hz Ambient conditions Ambient temperature on the housing -40~70°C Storage and transport temperature -40~80°C Process conditions Process pressure -1—40bar Process temperature(Normal temperature) -50—100 °C Process temperature(High temperature) -50—150C Sensitivity switch (The lowest density) Density Modes switch High Low Switching delay When immersed When laid bare Measuring accuracy Measured deviation Switching delay Repeatability Electronics Relay Relay rated load PNP Operating voltage Relay PNP Electrical protective...

9 Storage and transport 9.1 Packaging Your instrument was protected by packaging during transport. The packaging of standard instruments consists of environment friendly, recyclable carton cover material .The probe is additionally protected with a cardboard cover. For special version, PE foam or PE foil is also used. Please dispose of the packaging material through specialized recycling companies. 9.2 Transport Transport must be carried out under consideration of the notes on the transport packaging. Nonobservance of these instructions can cause damage to the instrument. The delivery must be...

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