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A good user manual
The rules should oblige the seller to give the purchaser an operating instrucion of Emerson MCU200, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.
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Unfortunately, only a few customers devote their time to read an instruction of Emerson MCU200. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.
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First and foremost, an user manual of Emerson MCU200 should contain:
- informations concerning technical data of Emerson MCU200
- name of the manufacturer and a year of construction of the Emerson MCU200 item
- rules of operation, control and maintenance of the Emerson MCU200 item
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Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Emerson MCU200 alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Emerson MCU200, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Emerson service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Emerson MCU200.
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After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.
Table of contents for the manual
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Page 1
Each Mobrey ultrasonic control system requires a sensor to suit the specific application, plus a control unit. These installation instructions cover the Mobrey control units in the MCU200 series. 1. Sensor installation 2. Control unit installation 3. Applications: 3. 1Gain adjustment 3. 2 Liquid level alarm 3. 3Pump control and latching arms 3. 4Bl[...]
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Page 2
1 . Sensor Installation When the gap is filled with liquid, the piezoelectric receiver crystal converts the ultrasonic wave into an electrical signal, which is transmitted back to the control unit using a second coaxial cable. Usually the two coaxial cables to the sensor are in one overall sheath. The control unit circuitry is a feedback amplifier [...]
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Page 3
T wo cables are required per sensor . The RG178 should be used where the cable itself is subject to temperatures exceeding 74°C. 2 . Control Unit Installation All cable connections are made to the terminal blocks along the bottom edge of the pcb (see fig.5). Release the terminal screw before inserting the wire. 2.2 External Connections Protection [...]
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Page 4
2.3 Switch Settings in MCU200 Series (i) Gain switch (and potentiometer): See section 3. (ii) Frequency selection This slide switch is labelled “FREQ” and is located between the sensor terminal block E2, and the Aux input terminals. This selects the operating frequency of the MCU200 oscillator , which is either 3.7MHz (switch in the 'up&ap[...]
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Page 5
3.1 Gain adjustment Correct adjustment of the gain (HI/LO switch and potentiometer) is essential for proper operation of any ultrasonic sensor system. This adjusts the gain of the feedback amplifier in the control unit, which produces oscillation of the sensor when the coupling between the ultrasonic crystals is sufficient. Therefore the higher the[...]
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Page 6
3.3 Pump control and latching alarms The output relay of the MCU200 can be latched into the de- energised state. This latch is achieved by short circuiting the two terminals of the Auxiliary input, labelled as terminals 3 & 4 on the pc board (see figure 5). The relay will remain de- energised while the latching short circuit is applied. Only af[...]
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Page 7
3.4 Interface Detection 3.4.1. Suspended Solids blanket sludge discharge detection The Mobrey MCU200 control unit can be used in conjunction with a 433S sensor to provide sludge blanket level detection in a settling tank, facilitating the control of automatic desludging. Similarly , in conjunction with a Mobrey sludge pipe using a pair of 488S sens[...]
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Page 8
3.4.3. Interface detection between two immiscible similar liquids When liquids are ultrasonically very similar - as happens for example with paraffin and water - the procedure in section 3.4.2. produces very little difference between the two “false dry” points. In this case the “reflection” method of interface detection is used. If an ultra[...]