Catalog excerpts
Operating Instructions Fork-11 Tuning Fork Level Switch
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SHENZHEN JIWEI AUTOMATION LTD. www.jiweimeter.com
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1 Introduction 1.1 Brief description Fork-11 Tuning Fork Level Switch is mainly used to measure the level of powders and fine-grained bulk solids. It is particularly suitable to measure ultra low-density materials with the lowest measurable density of 0.008g/cm³ which makes Fork-11 have wide adaptability and high , reliability. 1.2 Operating principle Designed on the basis of tuning fork, Fork-11 uses piezoelectric devices to achieve vibration drive and detection. The fork vibrates freely under the resonance frequency when it is not covered by materials, but vibration amplitude of fork will...
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3 Installation 3.1 Before installation Before installation, please make sure that all parts of the instrument are suitable for the existing process conditions. In order to ensure the instrument work normally after installation, please be aware of process pressure, process temperature as well as the chemical properties of the medium. 3.2 Horizontal Installation In order to achieve a very precise switching point and to ensure measurement validity, Fork-11 can be installed horizontally. If measurement error allows within a few centimeters, recommend mounting Fork-11 approx. 20°inclined to the...
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3.4 Avoid Mounting at Filling Opening As Figure 4 shown, when choosing mounting position, avoid mounting Fork-11 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.4: Avoid mounting at filling opening 3.5 Moisture When the instrument is mounted in outdoors or high humidity areas, please lead the connection cable downwards in front of cable entry, thus the rain and condensation water can drain off and give your instrument...
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①: Voltage supply/8/16mA signal output ②③: Relay signal output, DPDT 4.4 Wiring procedure For Ex instruments, the housing cover may only be opened if there is no explosive atmosphere present.Proceed as follows: (1) Unscrew the housing cover. (2) Loosen the locknut on the cable gland. (3) Remove about 10cm（4in） of the cable mantle, strip about 1cm(0.4in) of insulation from the ends of the individual wires. (4) Insert the cable into the housing through the cable entry. (5) Unscrew the terminals with a screwdriver. (6) Insert the wire ends into the open terminals according to the wiring...
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5.2 Sensitivity adjustment Through adjusting the sensitivity switch on the control panel of Fork-11 makes it better to adapt to the measured medium. As default setting, the potentiometer is set to the right end position, medium with density of ≥0.02g/cm³can be detected. If measure very light-weight medium, should turn the potentiometer to the left end position (the lowest measureable density is 0.008g/cm³ thus, ), the detection is more sensitive and more reliable. Warning: The equipment is precise instrument, by default, the sensitivity adjustment potentiometer is set to the right end...
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Table 2 Two-wire electronics moduleInstallation location Output Current Signal lamp (High) Overfill protection (High) Overfill protection Safety note: When testing the function of Fork-11, do NOT hold the fork body by hands, it may damage to the sensor, even distort the fork body. 6 Fault analysis and maintenance 6.1 Fault analysis The operator of the instrument is responsible for taking suitable inspections to rectify faults. Fork-11 offers maximum quality and reliability. Nevertheless, faults may occur during operation. These may be caused by the following: • Electronics module • Voltage...
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Depending on the reason for the fault and the inspections taken, the steps described in chapter “Set up” may have to be carried out again. 6.2 Exchanging the electronics module If the electronics module is defective, in order to continue using the instrument, it is recommended to replace electronic module. In Ex applications, you should pay attention to the electronics module with respective Ex approval. In general, all electronics modules of Fork-11 can be replaced with each other. However, if the electronics module with a different signal output, not the same, you should pay attention to...
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JIWCI — vt%am — Measuring frequency Ambient conditions Ambient temperature on the housing Storage and transport temperature Process conditions Process pressure Process temperature(Normal temperature) Process temperature(High temperature) Sensitivity switch (The lowest density) High density Low density Modes switch High Low Switching delay When immersed When laid bare Electronics Operating voltage Relay Breaking capacity Min Max Two-wire Cable entry/plug Cable entry Plug Electrical protective measures Protection rating Overvoltage category Protection class Relay I Approvals Instruments with...
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SHENZHEN JIWEI AUTOMATION LTD. www.jiweimeter.com
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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...
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N For Ex-free area I Intrinsic Safe (Ex ia IIC T6) D Flame-proof (Ex d IIC T6) Process fitting TG Thread G11/2''A TN Thread NPT11/2''A FA Flange DN50 PN40 FB Flange DN80 PN40 FC Flange DN50 PN16 FD Flange DN80 PN16 XX Customized design Notes: If ® is selected, the options of “I” of the certificate are not available. SHENZHEN JIWEI AUTOMATION LTD. www.jiweimeter.com
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