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Summary of Contents for Milltronics LevelGenie
- Page 3 CONTENTS TITLE SECTION PAGES GENERAL INFORMATION SPEICIFCATIONS 2-1, 2-2 THEORY OF OPERATION 3-1, 3-2,3-3,3-4 INSTALLATION 4-1, 4-2,4-3 CALIBRATION AS A: 5-1, 5-2,5-3,5-4 HI - LO ALARM HI - HI ALARM LO - LO ALARM PUMP CONTROL MISCELLANEOUS MAINTENANCE AND OVERHAUL DRAWINGS FIG.
- Page 4 GENERAL INFORMATION The Milltronics Level Genie Ultrasonic System is an entirely "Solid State Package", designed to provide contact closure at accurately determined levels of liquids and solids up to 10 feet (3M) from the transducer. This system consists of only two elements, ultrasonic transducer and cabineted electronics, neither of which require contact with the material to be measured.
- Page 5 SPECIFICATIONS Power Required 115 VAC + 10% 40 Hz at 6VA Transducer Barium Titanate element C.P.V.C. outer housing and polyurethane radiating face. Optional face materials are available. Transducer rated for Class I, Groups A, B, C, D, &'Class II Groups F & G. 1.5 to 10.0 feet Range 0.45 to 3.1 meters...
- Page 6 Operating Modes* Pump up/down Hi-Lo alarm Hi-Hi alarm Lo-Lo alarm One programming module supplied with unit. Additional modules available as options. Enclosure Nema 12 standard Nema 4 optional Weight Transducer - 2 lbs. Enclosure & Electronics - 12 lbs.
- Page 7 III. THEORY OF OPERATION TRANSCEIVER CIRCUITRY General Description The transceiver uses a single tuning section which is time-shared between the transmitting and receiving functions. Three co-ordinatinq signals, generated in conjunction with the repetition rate signal, control the transceiver switching it between transmitting and receiving modes.
- Page 8 Q6 and Q7 provide additional amplification. Q7 also serves as a detector charging C9 with the positive half- cycles of the received signal. Q8 is turned on during the blanking period to prevent C9 from accumulating any charge. Thereby precluding any receiver output during this time period, When the voltage on C9 reaches about 1 volt, Q9 turns on and the voltage at the collector of Q9 falls to zero signifying...
- Page 9 ECHO PROCESSING LOGIC General Description The digital echo processor establishes the necessary timing and limit functions. Coincidently, statistical techniques are employed to discriminate against response to spurious noise inputs. Timing & Limit Generation IC 3-1, IC 3-2 and IC l-l form a typical hybrid monstable multivibrator.
- Page 10 Digital Echo Processing Various digital, statistically based, processing techniques are employed to render the Level Genie immune to random noise inputs. Echo width detection ignores short duration signals such as line transients and most SCR noise. Echo reception logic accepts only one echo per transmit sequence.
- Page 11 INSTALLATION Electronic Package The electronic circuits of the Level Genie Ultrasonic Level Switch are contained on a single printed circuit Refer to Fig. 1 A Nema 12 enclosure is supplied. motherboard. for outline and mounting dimensions. Separate 1/2" conduits should be installed for the power wiring and the transducer cable.
- Page 12 Alarm Anti-Latch Circuit (stab select at A position) In some applications, the Level Genie is used to detect Usually, a HIGH-HIGH an object instead of a material level. HIGH alarm to detect the object program module can be used: and in the absence of the object, echoes received from any However, target out of HIGH alarm zone will reset the system.
- Page 13 disable the alarm time delays while calibrating. The "10 ft. - 5 ft.'" toggle should be in the appropriate position reflecting the desired operating range. Transducer The ST25 series transducers have an outer housing of chlorinated polyvinyl chloride (CPVC) and a radiating face of polyurethane.
- Page 14 within the vessel such as a supporting beam which would interfere with the sound path between the transducer and the material being measured. NOTE Ultrasonic sound waves are radiated from the face of the Transducer within a cone of approximately 8 degrees. Level Genie System depends upon these sound waves reaching the surface of the material to be measured and being re- flected back along this same "sound path".
- Page 15 CALIBRATION Before applying line power to the Level Genie, ensure that all pre-start-up checks (Section IV) have been completed. General Alarm Calibration It is usually expedient to calibrate the Level Genie before installation, thereby avoiding the necessity of changing bin levels to set the trip points. After install- ation a spare transducer serves as an invaluable tool for checking calibration.
- Page 16 SPECIFIC CALIBRATION OF HI-HI PROGRAM MODULE (OMIT IF OTHER PROGRAM USED) With the transducer placed at a distance from a fixed target representative of the high level, farthest from the transducer, adjust the "FAR" potentiometer counter Then turn the control clockwise until LED2 comes on.
- Page 17 a delay in output response by 3 seconds or 10 seconds depending on the position of the delay toggle. I M P O R T A N T Rotating the"NEAR"and"FAR"setpoints in the direction of the arrows (on the PCB) brings the trip points closer together.
- Page 18 Pump Up/Down Program Module Actuation In "pump down" operation, the liquid level must rise above Once this condition the NEAR setpoint to de-energize the relays. is met they are locked in the de-energized state, until the level Thus, rising above the near set- drops below the FAR setpoint.
- Page 19 Set the "NEAR" potentiometer 1/4 turn from fully counter clockwise. This sets Set the "FAR" potentiometer fully clockwise. the trip point at maximum range. Move the transducer toward the target until the LED indica- Then, with the tors extinguish (relays dropped out). distance between the transducer and target corresponding to the desired low level, adjust the "FAR"...
- Page 20 MISCELLANEOUS Checks to make before pushing the Panic Button SYMPTOM CAUSE Unable to calibrate one Program module offset in socket setpoint or inverted. 'NEAR'setpoint set too close to High Alarm apparently inoperative minimum range or within blanking range. (Turn near setpoint in direction of arrow) Erratic &...
- Page 21 VII. MAINTENANCE This equipment requires very little maintenance due to its solid-state circuitry. However, a program of periodic preventive maintenance should be initiated. This should include regular inspection, general clean- ing, transducer face inspection, overall system performance checks, and standard good-housekeeping practices.
- Page 22 FIG-1 OUTLINE & MOUNTING DIAGRAM...
- Page 24 F I G : 3 E A S I L Y A V O I D A B L E I N S T A L L A T I O N E R R O R S .
- Page 30 The next time you need professional know-how in materials handling do as more and more industries around the world are doing. Call us. Tel. (705) 7452431 Telex 06-962851 MILLTRONICS LTD., 730 The Kingsway, Peterborough, Can. K9J 6W6 MILLTRONICS INC., 2409 Avenue ‘J’, Arlington, Texas 76011 Tel. (817) 649-8640...
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