Condensed Version of Operator s Manual For The VL600 Series Flowmeters Warranty Agreement JTEC Associates warrants this product to be in good working order for a period of twelve (12) months from installation. This warranty period will not exceed eighteen (18) months from the date of purchase and is valid only if the warranty form is returned validating the date of installation. If the warranty form is not received by JTEC within six months of the date of sale, noting the date of installation, the warranty period will be 12 months from the date of purchase. Introduction The VL600 Series Flowmeters are designed to provide accurate and repeatable liquid flow measurement in designated engineering units. The flowmeters employ a patented ultrasonic technique to measure a form of turbulence created in the flow stream. This turbulence, known as Von Karman Vortex Street, is related to the volumetric flow through the pipe. The flowmeter primary output is a 420 milliampere (ma) current source whose current output is proportional to the flow. The secondary output is a pulse train whose frequency is directly proportional to the flow. Each VL600 Series Flowmeter is precisely calibrated against flow standards traceable to NIST (National Institute of Standards and Technology). The VL600P Series Flowmeters are for pipe diameters 1/2, 1, 11/2, 2, 3 and 4 inches. The VL650 Series Flowmeters are for pipe diameters of 1, 11/2, 2 and 3 inches. The VL600TRI Series Flowmeters are an insertionstyle retractable flowmeter that is installed through a 2inch full port isolation valve which permits the unit to be retracted or inserted manually without shutting down the system. These flowmeters are calibrated in actual volumetric flow rates such as gallons per minute (GPM). Installation/Installation Location The flowmeter has been shipped completely assembled, tested and ready to operate in its permanent location. JTEC recommends a minimum of 20 pipe diameters upstream of any obstruction such as elbows and valves, a minimum of 10 pipe diameters is recommended from the meter itself. For shorter distances, consult factory for change in accuracy and performance. The VL600 Series Flowmeters use a patented ultrasonic technique to measure volumetric flow. An ultrasonic noise can interfere with this technique, therefore, high intensity ultrasonic noise sources should not be located upstream or downstream from the sensor. Common ultrasonic noise sources include the following: 1. Slightly cracked valves operating with large pressure drops. 2. Small pipe leaks in high pressure systems. 3. Flange gaskets must not project into the flow stream. Gaskets should be trimmed approximately 1/8 larger in diameter than the bore of the meter. If these ultrasonic noise sources cannot be eliminated, the meter should be mounted with at least one elbow between the flowmeter and the noise source. The VL600P Series Flowmeters are designed with Schedule 80 tube ends (no fittings). Optional fittings are flanges, male adapters, female adapters, or unions. The labeling of the flow direction on the flowmeter should be aligned with the flow in the pipe. WARNING: Unnecessary overtightening will cause damage to both pipe and fitting. The VL650 Series Flowmeters are designed to mount between two ANSI flanges using the appropriate bolts. The flowmeter should be mounted so its inside diameter is centered inside the pipe. Gaskets (not provided) are necessary between the sensor and the ANSI flanges. Insure that these gaskets are properly installed and do not protrude into the flow stream. The labeling of the flow direction on the flowmeter should be aligned with the flow in the pipe. See Table 5 on Page 2. CAUTION: Avoid bending the vortex strut or damaging the transducers during installation. Do not remove cover plates while unit is operating in the system. The VL600TRI Series Flowmeters are designed to mount on a standard ANSI 150 lb., 2inch pipe flange. It is recommended that the customer conduct a flow profile survey and place the probe at the optimum point. The labeling of the flow direction on the sensor should be aligned with the flow in the pipe. CAUTION: Avoid bending the vortex strut or damaging the transducers during installation. Do not remove cover plates while unit is operating in the system.
Upstream Obstruction Minimum Required Straightrun Pipe Diameters Upstream From Meter 90 Elbow 10 Two 90 Elbows, Same Plane 15 Two 90 Elbows, Different Planes 20 Flow Straightener (recommended whenever an axial swirl exists in the 10 flow stream) Fully Open Shutoff Valve 5 Downstream Obstruction Minimum Required Straightrun Pipe Diameters Downstream From Meter Control Valve 5 TABLE 5 Minimum Piping Requirements The VL600TRI Series Flowmeters are designed to mount on a standard ANSI 150 lb., 2inch pipe flange. It is recommended that the customer conduct a flow profile survey and place the probe at the optimum point. The labeling of the flow direction on the sensor should be aligned with the flow in the pipe. CAUTION: Avoid bending the vortex strut or damaging the transducers during installation. Do not remove cover plates while unit is operating in the system. The VL600TRI insertion flowmeter has a torque requirement for the conax fitting which is 90100 ft. lbs. Electrical Installation VL600P Series: The electrical connections are made using screw type terminals located inside the electronics enclosure. To expose these terminals, remove the lid from the electronics enclosure. VL650 and VL600TRI Series: Electrical connections are made using screwtype terminals located inside the electronics enclosure. To expose these terminals, remove the lid from the smaller end of the AdaletTM enclosure. Flowmeter Wiring A two or three conductor cable of 12 to 24 AWG solid or stranded wire is required to make a connection to the flowmeter. It is recommended that a shielded interconnecting cable be used. The maximum cable length for the power depends on the supply voltage required to drive the flowmeter and the current meter being used to monitor the current output of the flowmeter. The maximum length of the cable is determined by using Figure G to calculate the maximum load (resistance in Ohms) that can be driven using the known power supply voltage. In determining this value the voltage drop across the meter being used to monitor the current output of the flowmeter must be considered. After this value has been found, Table 6 can be used to calculate the resistance in the cable being used and adjust the input voltage as required. See Figure D Flowmeter Terminal Functions on Page 3 See Figure E Flowmeter Hookup Examples on Page 5 See Figure G Load Resistance vs. Supply Voltage on Page 4 Ohms/Ft Related to Wire Size (AWG) 12 AWG = 0.00162 Ohm/Ft 14 AWG = 0.00258 Ohm/Ft 16 AWG = 0.00429 Ohm/Ft 18 AWG = 0.00651 Ohm/Ft 20 AWG = 0.01035 Ohm/Ft 22 AWG = 0.01310 Ohm/Ft 24 AWG = 0.02620 Ohm/Ft TABLE 6 Line Resistance For Current Lines
VL600P SERIES FLOWMETER CHASSIS GROUND SCREW VL650 & VL600TRI SERIES FLOWMETER FIGURE D Flowmeter Terminal Functions
Rt MAX (OHMS) Rt MAX = (Vloop12V)/20mA 1000 900 800 700 600 500 400 300 200 100 0 13 16 19 22 25 28 31 34 SUPPLY VOLTAGE (32 VDC MAX) FIGURE G Load Resistance vs. Supply Voltage
420 ma RECEIVER + VL600P Series Terminal Block Layout 1332 VDC POWER SUPPLY + 2CONDUCTOR SHIELDED CABLE + CURRENT OUTPUT 2WIRE HOOKUP R/T DISPLAY 420 ma RECEIVER + VL600P Series Terminal Block Layout 10 uf Capacitor 1332 VDC POWER SUPPLY + 2CONDUCTOR SHIELDED CABLE + CURRENT OUTPUT 2WIRE HOOKUP WITH RATE/TOTALIZER DISPLAY VL600P Series Terminal Block Layout 420 ma RECEIVER + BATCHER 1332 VDC POWER SUPPLY + 2CONDUCTOR SHIELDED CABLE + CURRENT OUTPUT 2WIRE HOOKUP WITH FREQUENCY OUTPUT FIGURE E VL600P Series Flowmeter Examples of Various Flowmeter Hookups
Pulse Output Line The pulse output is a secondary output and is not intended for long transmission. The load on the line must be 50,000 Ohms minimum and 1,000 picofarads maximum. Operation The flowmeter s 3 or 4 position terminal strip provide all the connections needed to operate the flowmeter. +/ 420 ma Terminals The +/ 420 ma terminals are used for the flowmeters power supply. This power supply should be 13 to 32 VDC and be capable of supplying 20 ma to the flowmeter. This output is a standard 4 to 20 ma output, where 4 ma corresponds to no flow and 20 ma indicates 100% (full scale) flow. The correct output will not be accurate if the load resistance on the current output terminal is too high. The maximum load resistance that the terminal can drive versus the power supply voltage is shown in Figure G. Please see Flow Meter Wiring in this manual for further data. Frequency (Freq Out) Terminal If the Frequency (Freq Out) function is to be used the flowmeter must be powered as described in the previous paragraph for this option to be functional. Attach a cable as described in this manual to the Freq Out terminal and terminate the other end of the cable at the desired location. The pulse train output frequency is proportional to the liquid flow. The pulse levels are 0.7 to 6 VDC. See Figure H Troubleshooting Chart Flow Conditions on Page 7 See Figure J Troubleshooting Chart Flow Conditions on Page 8 See Figure R Rescaling of Circuit Card on Page 9
START Change Wire Check Wiring at Terminal Strip Wiring Correct? Does Unit have PWR on? Turn on Power Problem Output Current Present? Output Correct? Check PWR Requirements Is PWR Connected to J2 on Ckt Card? Too High? Check for 4 ma Output From CUR to GND Is Freq Output Zero? Is 4 ma Present? PCB Bad.. Done Is Flow Really Zero? Eliminate Flow Adjust HYS (R14) Clockwise Until Freq = Zero Is Freq Really Zero? Check Current Output Is Current 4 ma? Done FIGURE H Troubleshooting Chart Flow Conditions JTEC Associates, Inc. REVISION E
START Erratic Output? Unit Installed Correctly? Correct Positioning Adjust Flow for Value In Meter Range Is Flow Too High or Low for Range of Meter? Does Meter Have Valves, Regulator, Elbow or Sonic ises Upstream of Meter? Eliminate ise Source Use Setup Procedure Does Current Output Match Freq Output from Calibration Data Sheet? Does Meter Have Correct Pipe Diameters Upstream Pipe Downstream? or Install More Pipe Does Unit Show Clean Pulse On FREQ Terminal? Unit Showing Actual Flow For Further Assistance FIGURE J Troubleshooting Chart Flow Conditions JTEC Associates, Inc. REVISION E
RESCALING THE CURRENT OUTPUT This procedure details the rescaling of the current output after installation. Applicable connections and component locations are described in Figure R. NOTE: Make sure the VL600 Series Flowmeter is filled with liquid prior to performing this rescale function. 1. Connect power (13 to 32 VDC) to terminals marked + 420 ma. Return with a device to measure the current output as illustrated in Figure R. 2. Connect a frequency counter to the terminal marked FREQ OUT. 3. Turn on power to the circuit board. While pressing the TEST button, monitor the frequency output. 4. Adjust the potentiometer marked TEST FREQ to the desired frequency for full scale flow. 5. Continue pressing the TEST button and monitor the current output reading. If the current output does not read correctly (20 ma), then adjust the potentiometer FULL SCALE ADJ until 20 ma is achieved. 6. Release the TEST button. 7. If all adjustments have been made successfully, the unit is rescaled. FIGURE R Rescaling of DBA0903 Liquid Flowmeter Circuit Card JTEC Associates, Inc. REVISION E