Hexamite U200 Process Controller

U200MC Level Manager

U200MC range 10 meters
U200MC-20 range 20 meters
Low Set Point
High Set Point
Level Management of Solids and Liquids
Sub terrain resource management

The U200mc device is a versatile general purpose level manager. Since the ultrasonic wave can be guided around corners, it is useful for sub terrain resource monitoring and management. It is also useful in hazardous environments because the sensor can be placed out of harms way. The U200 is equally applicable when monitoring solids.

U200MC Operation The U200MC is a wall or panel mount level controller and monitor. When the device is turned on, it enters into operation cycle, i.e., a 40kHz burst in excess or 300 V(rms) is produced on the signal out pin once every 100mS. The internal clock is started prior to initiating the 40kHz burst and stopped at the arrival of the first echo detected through the “signal in pin”. The time of flight is converted into distance to the first object causing the echo. This distance is continuously presented on the LCD display. The control process indicators show the difference between the set-point and the actual distance measured.
If the distance is less than the set-point, the LED on the "Control Process Indicator" to the left of the mid indicator are set, and the relays (see I/O terminals below) are set, as shown. If the level is greater than set-point, the relays are energized and an LED to the right of the mid indicator is set.
Setting the Control Parameters Pressing the key labeled ENTER during the distance acquisition and display cycle will break the cycle and the set-point is displayed. Once the set-point is displayed, pressing the key labeled NEXT will cause the operating cycle to be resumed. If while the set-point is displayed, the key labeled CHANGE is pressed, the device will enter edit mode. In edit mode, when the least significant digit on the display is blinking, it’s value can be changed by pressing the CHANGE button. When the CHANGE button is pressed, the blinking digit rotates from 0 to 9 and rolls over.
The NEXT button advances the blinking digits to the next higher significant digit. If the NEXT button is pressed while the most significant digit is blinking, the set-point is locked. If while the set-point is locked, the ENTER button is pressed, the new set-point will be entered into memory, and the device enters into SPECIAL PARAMETER EDIT. If while the set-point is locked the NEXT button is pressed, the device proceeds into SPECIAL parameter edit without changing current set-point. The Special Parameters are edited using the same procedure used to edit the set-point.

Special parameter

During set-up, the process control indicators are used to indicate which of the five parameters is being edited. The next button is used to advance through the parameters. The CHANGE button is used to change the value of the parameter, or optionally, ENTER can be used to store the altered parameter. The process control indicator advances from left to right, the leftmost LED being LED # 1.

LED#	Parameter	Data Range
1	Gain	0, 1, 2, 3 and 4
2	Transmission Frequency	0, 1, 2, 3, 4, 5 and 6
3	Settling Delay	1 - 20
4	Reverberation Delay	1 - 20
5	Averaging Points	0, 1, 2, 4, 8, 16, 32, 64 and 128

Gain

The gain is lowest at 0 and highest when 3 is selected. If 4 is selected, the gain is automatically set as a function of time.

Transmission Frequency

Value Selected	Frequency (kHz)
0	41.7
1	41.2
2	40.8
3	40.4
4	40.0
5	39.6

Settling Delay

Settling delay is needed to allow the transmission element, or the transceiver, to settle. This is especially true when the same element is used to both transmit the sonic wave and receive the echo. To transmit, the transceiver is usually excited using a voltage level in excess of 300 Volts. Shortly after excitation, the transceiver must be ready to receive signals smaller than a millivolt. Once the crystal is excited, it can take more than 5 milliseconds after excitation has terminated for the crystal to quit vibrating. Settling Delay becomes less critical if separate elements are used to transmit and receive. The settling delay is the value selected multiplied by 512uS.

Reverberation Delay

Usually the reverberation delay that comes with the sampling cycle is sufficient. However, under certain circumstances, it may be necessary to apply a reverberation delay. The reverberation delay is the value selected multiplied by 20mS. If the selected value is 0, there is no added reverberation delay. Under normal circumstances no added reverberation delay is needed.

Averaging points

The number of averaging points accumulated on distance data can be selected as 0, 1, 2, 4, 8, 16, 32, 64 or 128 points.

I/O configuration

When a single transceiver is used (where a single element both transmits and receives) "Signal Out" and "Signal In" can be connected together. The input and output lines are separate when one element is used to receive and another to transmit.

Electrical Specification
Parameter	Value	Units
Power	7 - 16	Volts
Current consumption	60	mA
Output Power Excitation (Push Pull) Nominal 40kHz	300	mW