Instruction/ maintenance manual of the product MCU200 Emerson
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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.
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.
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.
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.
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.
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).
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.
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.
An important point after buying a device Emerson MCU200 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Emerson MCU200 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Emerson MCU200 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Emerson MCU200 you will learn all the available features of the product, as well as information on its operation. The information that you get Emerson MCU200 will certainly help you make a decision on the purchase.
If you already are a holder of Emerson MCU200, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Emerson MCU200.
However, one of the most important roles played by the user manual is to help in solving problems with Emerson MCU200. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Emerson MCU200 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
