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Instructions Leaflet
IP221, Rev. AA
November 2004
Mobrey
Electropulse systems
For instructions specific to units
used in hazardous area
installations
refer to leaflet IP221/SI
Hi-Sens
Normallay acting
Summary
Cables
2.5 Intrinsically safe application
Appendices
Appendix I
Appendix II
Appendix III
1
Level
Contents
2
3
4
5
5
6
7
10
12
12
15
16
17
17
18
20
22
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23
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Summary of Contents for Emerson Mobrey
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Page 1: Table Of Contents
Instructions Leaflet IP221, Rev. AA Level November 2004 Mobrey Electropulse systems Contents Safety Information 1. Introduction 1.1 Sensors Gap Sensors Hi-Sens 1.2 Interface detection Attenuation method Reflection method 1.3 Sludge density detection 1.4 Head amplifier units Normallay acting Inverse acting Summary 1.5 Control Units... -
Page 2: Safety Information
Warning : If this equipment is used in a manner not specified by the manufacturer, the protection provided may be impaired. All installation and commissioning of this equipment must be carried out by electrically competent persons. Protection of permanently installed equipment : This equipment is regarded as permanently installed equipment. -
Page 3: Introduction
1. Introduction The Mobrey Electropulse system is used for the detection of liquids or liquids with suspended / settled solids. It consists of three units, a sensor, a head amplifier unit, and a control room unit. 1.1 Sensors There are many different Mobrey sensors available, but they fall into two categories: a) Gap sensors Figure 1.1 - Gap sensor, cut away to show construction... -
Page 4: Interface Detection
1.2 Interface detection Attenuation method – Figure 1.3 Attenuation is the reduction in strength of the ultrasonic signal caused by its transmission through a liquid. Viscous liquids, emulsions and liquids containing solid particles have a greater attenuation than clear thin liquids. Usually the difference in attenuation between the two liquids is sufficient and the attenuation method can be used to determine which liquid is in the sensor gap. -
Page 5: Sludge Density Detection
In addition the Electropulse system can be used to detect the solids density of a slurry in a pipe line. In this case the Mobrey pipe section is used instead of the sensor. Figure 1.5 - Sludge... -
Page 6: Inverse Acting
ii) Inverse acting head amplifiers When it is required to use a Hi-Sens sensor for low level detection, or a Gap Sensor for high level detection, an inverse acting amplifier must be used. Examples of this are given below: • Hi-Sens can be used to detect low levels in very light liquids or foams. -
Page 7: Installation
2. Installation 2.1 Calibration When installing the sensor, it should be remembered that it is measuring instrument, and should be treated with care. Before installation the sensor and control unit should be inspected for transit damage, the gap faces of gap sensors must be parallel. Before installation, the equipment should be calibrated, if possible, using a representative sample of the liquid in which it is to be used. - Page 8 Calibration procedure by sensor type i) Hi-Sens Sensors Ensure that the sensor is clean and dry, that nothing is touching the sensor body, and that the delay adjustment on the control unit is fully anti-clockwise. Set the gain potentiometer in the head amplifier fully anti-clockwise, and the gain switch (if fitted) in the low gain position.
- Page 9 With the sensor in the upper liquid, increase the gain, using the switch if necessary, until the control unit changes to ‘Normal’. Note the position of the potentiometer. If the control unit does not change to normal then the end of the scale should be used as a reference. The gain should be set half way between the settings found in steps 3 and 5.
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Page 10: Sensor And Head Amplifier Installation
2.2 Sensor and head amplifier installation Make sure that there is room inside the tank for the sensor without anything touching it, and that the gap is not obstructed. At least an inch of clearance must be left around Hi-Sens senors. The head amplifier should have its cable glands downwards if possible to reduce the possible to reduce the possibility of ingress of rainwater. - Page 11 * DIN RAIL Mounting Clip available on request Figure 2.3 - Control unit mounting details...
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Page 12: Control Unit Installation
2.3 Control unit installation The control units should be installed in an area suitable to their specifications. They are designed to be used indoors, but could be installed outside using a suitable weatherproof enclosure. The front panel should be accessible to the operator. The standard control unit MEP*L is installed by undoing the two screws on the top and bottom of the unit, and removing the base. -
Page 13: Control Unit
ii) Head Amplifier Unit The head amplifier terminals A+ and B- should be connected to the cores of the control unit cable. In the case of the dual marine unit, lower sensor connections A+ and B- are connected to the two cores of one cable, and upper sensor connections, C- and D+ to the other. - Page 14 MEP 3B I.S. To head amplifier Screen to be connected Relays Protective Earth Supply Neutral Live MEP 3L I.S. Figure 2.6 - Control Unit Connections...
- Page 15 2.5 Intrinsically safe installation Control units type MEP3* and head amplifier units to type MEP3** and ***S*P*H** are approved by ATEX as intrinsically safe equipment to II 1 G Ex ia IIC. Refer to safety instruction IP221/SI and local code of practice. The following points must be noted when installing these units:- The cable from the head amplifier to the control unit must be screened, and the screen must be connected at the control unit end only.
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Page 16: Fault Finding
3. Fault Finding If the unit does not work as described in the text, this section suggests some simple checks which will rectify most faults. If the system still ceases to work or there is any doubt as to its working, the factory should be consulted. -
Page 17: Specification And Description
4. Specification and Description 4.1 Sensors Sensor Minimum Maximum Maximum Fitting Frequency Type Temperature Temperature Pressure ºC ºC Kg/cm 302S R¾” 30HS R1½” 312S R1” 312SP R1” 323S R¾” 352S R¾” 362S -210 3.75 R¾” 366S -210 3.75 373S R¾” 393S R¾”... -
Page 18: Control Units
4.3 Control Units Rack Mounted Unit MEP*R Free Standing Unit MEP*L 1: 220/240V ±10%, 50/60Hz Supply: 2: 110/120V ±10%, 50/60Hz Less than 6VA Less than 7VA Power consumption: Fault relay: SPCO, Energises in Alarm relay Output: fault mode DPCO relay, energised in normal Alarm relay: High current SPCO, mode, releases on fault or alarm Low current DPCO, Energised in... -
Page 19: Recommended Spare Parts
5. Recommended Spare Parts 5.1 Sensor and head amplifier Sensors and head amplifiers are supplied as integral items, and therefore no spare parts are available. In the case of sensor mounted head amplifiers, the sensor is attached to the head amplifier, and the two are not usually available separately. -
Page 20: Part Numbers
Appendix I - Part Numbers Please note that the existence of a part number does not imply the availability of a unit. 1. Sensors and Sensors with Head Amplifiers Head Amplifier Type Approval Fitting Sensor Mounted Outside Fitting None Adjacent Mounted ATEX Double Fitting Lloyds Register of Shipping... - Page 21 3. Control Units M E P 3 L / 1 D Mounting Mains Voltage Output Relay Intrinsic Safety Rack Mounted 220/240 Single Pole Changeover Intrinsically Safe Wall Mounted Volts Double Pole Changeover 110/120 Volts 4. Racks M E P 3 B / 0 7 Intrinsic Safety Number of spaces for control units Intrinsically Safe...
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Page 22: List Of Illustrations
Appendix II – List of illustrations Section Figure Title Page Introduction Gap Sensor Hi-Sens Sensor Attenuation Method Interface Method Sludge Density Sensor Installation Head Amplifier Adjacent head amplifier Control unit mounting details Wiring Summary Sensor connections to adjacent head amplifier Control unit connections Appendix III - List of tables Section... -
Page 23: Maintenance / Inspection
Maintenance / Inspection This is limited to periodic inspection by a qualified person to ensure that the installation including wiring and equipment housing is safe. Clean only with a damp cloth, ensuring that no moisture enters control unit. Check unit for damage and if damaged do not use. -
Page 24: Www.mobrey.com
Level November 2004 abcdef The Emerson logo is a trade mark and service mark of Emerson Electric Co. Rosemount is a registered trademark of Rosemount Inc. Mobrey is a registered trademark of Mobrey Ltd. All other marks are the property of their respective owners.
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