Tek-Air VorTek VT-5000 series, VorTek VT-7000 series Installation, Operation & Maintenance Manual

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Vortek

AIRFLOW TRANSMITTER

SERIES VT- 5000 & VT-7000

INSTALLATION, OPERATION

& MAINTENANCE MANUAL

RELEASE 2.1

APRIL 2005

PROTECTED BY US PATENT 4,770,035

TEK-AIR SYSTEMS

41 EAGLE ROAD

DANBURY, CT 06810

TEL. (203) 791- 1400

FAX (203) 798-6534

WWW.TEK-AIR.COM

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FOREWORD

This manual is designed to provide the user with the information required to install, wire, configure, calibrate, operate, maintain, and trouble shoot VorTek Air Flow Transmitters. It is important that this manual be read in its entirety prior to installation and commissioning of VorTek.

While we would like to think that this manual is complete in content and clear in instruction, there may be questions that we haven’t anticipated. If you have questions that you would prefer to direct to a live person, we encourage your calls. Technical assistance is available from the service department, at 203-7911400 from 8:30 AM to 5:00 PM ET.

Tek-Air also offers a variety of service and maintenance packages to keep the equipment at peak performance. For further details contact the Service Department at the above phone number.

WARRANTY

Tek-Air Systems Inc. warrants that the products it manufactures, under normal use and service as described in the Operation and Instruction manual, is free from defects in workmanship and material for a period of thirty-six months from the date of shipment to the customer. This limited warranty is subject to the following conditions:

With respect to any repair services rendered, Tek-Air warrants that the parts repaired or replaced will be in good working condition, under normal use, for the period of the original warranty, or for 90 days from date of shipment to the customer if the original warranty period has expired.

This warranty is based on the return of the product to Tek-Air’s factory and does not include field repairs. Periodic maintenance required, as outlined in the Operation and Instruction manual, is the responsibility of the user.

Unless specifically authorized by Tek-Air in writing, no warranty is made with respect to, and no liability is assumed in connection with, any goods which are incorporated into other products or equipment by the Buyer.

The foregoing is in lieu of all other warranties and is subject to the conditions and limitations stated herein. No other expressed or implied warranty of fitness for particular purpose or merchantability is made.

The exclusive remedy of the user or purchaser, and the limit of the liability of Tek-Air or any other seller for any and all losses, injuries, or damage resulting from the use of this product shall be the return of the product and the refund of the purchase price, or, at the option of Tek-Air or any other seller, the repair or replacement of the product. In no event shall Tek-Air or any other seller be liable for any incidental or consequential damages.

Products manufactured by other manufacturers but supplied by Tek-Air carry the original manufacturers warranty.

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TABLE OF CONTENTS

1.0 OPERATION

1.1 General Description.................................................................4

1.2 Specifications .......................................................................... 5

1.3 Operation of VorTek

Sensors ................................................6

1.4 Transmitter Operation.............................................................. 7

1.5 Options ....................................................................................8

2.0 INST ALLATION

2.1 Probe Bar Mounting and Location...........................................8

2.1.1 Duct-Mounted Probes............................................................................. 8

2.1.2 Fan Inlet- Mounted Probes .....................................................................9

2.2 Transmitter Mounting and Location.......................................10

2.3 Probe Bar and Transmitter Connection................................. 11

2.4 Transmitter Wiring ................................................................. 11

3.0 STARTUP ADJUSTMENTS

3.1 General Description...............................................................12

3.2 Normal Operation..................................................................13

3.3 Damping Adjustment .............................................................13

3.4 Zero Check............................................................................13

3.5 Quick Calibration Check........................................................14

3.6 Threshold Adjustment............................................................14

4.0 CALIBRATION & MAINTENANCE

4.1 Field Calibration ....................................................................14

4.2 Bench Calibration..................................................................15

4.3 Offset Adjustment..................................................................16

4.4 Calibration Check..................................................................16

4.5 Wave Form Check with an Oscilloscope...............................16

4.6 Troubleshooting.....................................................................17

APPENDICES

Appendix A - VorTek Minimum Installation Requirements........... A1

VorTek Duct Probe Installation Diagrams..........A1-A4

VorTek Fan Inlet Probe Installation Diagrams .A5-A10

Appendix B - Cleaning of VorTek Airflow Measuring Probes....... B1

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Chapter 1 Operation

1.0 OPERATION

1.1 General Description

The Tek-Air VorTek insertion probes and an electronic transmitter. The VorTek measurement system is capable of measuring airflow volume in ducts of all sizes and shapes, as well as fan inlet bells.

VorTek insertion probes have multiple velocity sensors located along their length. Each sensor measures airflow velocity using a unique, patented (4,770,035) application of the digital velocity sensing technique using the principles of vortex shedding.

Vortex shedding is the generation of eddy currents created by an obstruction in an air stream. Airflow through each VorTek sensor creates a succession of eddy currents which are then sensed as pressure pulses. The frequency at which these pulses are generated, is directly proportional to the velocity of airflow around the sensor.

airflow measurement system consists of one or more duct

In large ducts, the profile of the air velocity across a duct is often uneven due to the bends and transitions in the ductwork. In-line devices such as dampers, elbows, and transitions also create disturbances in the flow profile. To compensate for these varying velocity profiles, multiple VorTek sensors are utilized within a duct. The frequency outputs of individual sensors are averaged to obtain the average duct velocity.

The VorTek transmitter totalizes the frequency signals from the individual sensors to perform true velocity averaging. From this average, an electronic signal (420mA) is generated for direct input to a customer’s control system.

The VorTek transmitter provides several beneficial features to the user, including adjustable damping, on-line zero check, on-line calibration, sensor diagnostics, and optional digital indication. This manual will cover the operation, installation, startup, and calibration of the VorTek probes and transmitter.

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Chapter 1 Operation

1.2 Specifications

Sensors and Probes

Sensor Type: Vortex shedding Velocity Range: 350 to 9500 FPM Probe bar Length: 8" to 72" Probe bar Configuration: Rectangular, Round, Oval, Fan Inlet Materials of Construction; Standard:

Mounting Plate: Galvanized steel Probe bar: Extruded aluminum Sensor Assembly: Aluminum and ABS Miscellaneous: EPDM finishing strip

Materials of Construction; Fume hood:

Mounting Plate: Stainless steel Probe bar: CPVC Sensor Assembly: CPVC and ABS

Materials of Construction; Stainless steel: (High Temp.)

Mounting Plate: Stainless steel Probe bar: Stainless steel

Sensor Assembly: Stainless steel Probe bar Support: Mounting Flange Plate and Threaded Rod w/nuts Sensors Per Probe: 1 to 6 per Bar Number of Probe bars per Transmitter: 1 to 4 (16 sensors maximum) Operational Temperature: -20 to 200°F, (160°F for CPVC) 320°F maximum for high temperature

Weight: Function of probe configuration

Transmitter Electronics

Input: One to Sixteen sensors Output: 4-20mA, fully isolated; 1-5VDC ; 2-10 VDC Load Capability: 650 ohms Voltage: 20-28VAC, 60 Hz Power: 8 VA, .33 amps at 24 VAC Probe bar Connections: Plug-in cable, Plenum Rated,10 ft. provided

(longer available as a special option) Calibration: Adjustable from 0 to 7000 for ducts; 0 to 9000 for inlets Operational Temperature: 0 to 140°F Frequency Conversion Error: less than ±0.25% FS (8 sensors) Temperature Error: less than ±0.5% over 25 to 125°F Signal Damping: 2 or 4 seconds, selectable Setup & Diagnostic Controls: Zero check, sensor check, Internal Cali

bration Standard: 122 Hz Dimensions: 7.5" x 7.5" x 3.5" (WxHxD) Weight: 5 lbs Mounting: Surface mount for wall, duct, or panel

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Chapter 1 Operation

1.3 Operation of VorTek

The VorTek Sensing system measures air velocity by a physical principle called vortex shedding. The vortex shedding phenomena can be witnessed all around us in everyday life. Swirling vortices, or eddy currents, are generated whenever air or liquids flow around an obstruction in their flow path. Common examples are the eddy currents which develop behind rocks in a stream, and in the fluttering of a flag behind a flag pole. The flag and the flag pole provide the most visual example of how vortex shedding works.

Sensors

The flag pole presents an obstruction in the path of the airflow, which is the wind. As the wind passes around the flag pole, vortices (eddies) are created in the wake of the pole. These vortices, in accordance with the laws of nature, are developed and shed in an alternating manner, from one side of the flag pole to the other. The evidence of the shedding of vortices is in the waving of the flag itself.

Tek-Air’s unique VorTek flow sensors use a trapezoidal shaped obstruction placed in a small tube section to generate stable vortices over a wide range of low velocities. Pressure sensors sense the passing of individual eddies. Multiple VorTek sensors are mounted on probe supports to provide ample coverage of the duct cross section.

AIR FLOW

High Pressure

Low Pressure

AIR FLOW

High Pressure

Pulse

No Pul se

Pulse

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Chapter 1 Operation

1.4 Transmitter Operation

The enclosure located on the external end of each duct probe bar is the probe electronics housing. It contains the electronics which sense the vortices generated by the VorTek probes. At the bottom of the enclosure is the electronic connector required to connect each duct probe to the transmitter. A ten foot long connecting cable is provided for each duct probe for this purpose.

The VorTek transmitter is capable of accepting inputs from as many as four probe bars from one measuring station, each with a maximum of four VorTek sensors each. Up to six sensors may be located on a single probe support bar but the total number of sensors can not exceed 16.

In the simplest sense, the transmitter electronics can be considered a pulse frequency-to-analog converter. The transmitter receives electronic pulses from each of the VorTek sensors. As every pulse represents the same increment of velocity, the pulses need only be summed together and integrated over time to determine velocity. Additional circuitry converts the total pulses per second into analog, 4-20mA signal which is proportional to either CFM or FPM.

The VorTek transmitter consists of a minimum of two circuit boards: the Amplifier board and the mother board. The amplifier board performs the required signal conditioning on up to eight VorTek sensor inputs. Either one or two amplifier boards are provided depending on the number of probe bars used at the station.

The mother board accepts the conditioned pulses from the amplifier board(s), sums them, integrates them, and converts them into a 4-20mA output signal. The mother board also provides the power supply, calibration adjustments, internal calibration standard, and circuitry to drive the optional digital display.

A “PROGRAM MODULE” is installed on the mother board and programs the unit for the correct number of sensors required for the specific configuration. This module “plugs-in” and can be changed easily for an alternate configuration if required.

Because airflow is inherently turbulent, it tends to produce fluctuating electronic output signals if not damped when high turbulence is present. Also, some commercial direct digital temperature control systems update control outputs only on changing input signals. The rapid input changes caused by airflow turbulence can cause these types of systems to effectively overload and crash. To allow the user to select the damping to meet his application, the transmitter includes a switch-selectable damping constant of either 2 or 4 seconds.

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Chapter 2 Installation

1.5 Options

Many users prefer to have a digital display as a part of the transmitter. This type of display is available as an option with the VorTek transmitter. A 3-1/2 digit display is available allowing a display of 0 to 1999 in either CFM or FPM, which is specified by the customer at the time of purchase. Multipliers of either x10 or x100 can be used to display up to 200,000 CFM.

2.0 INSTALLATION

The VorTek measurement system consists of two basic elements: the probes and the transmitter. The VorTek probe bars are inserted into the duct and measure the velocity of the air moving through the duct. The VorTek transmitter, which is mounted in close proximity to the probes, converts the electronic pulses generated by the probes into an electronic signal compatible with most DDC control systems.

The following details are provided on the mounting and installation of the VorTek transmitter and flow probes. Please read this data carefully and install the equipment in strict accordance with the instructions provided. Should you have any questions, contact Tek-Air directly.

2.1 Probe Mounting and Location

2.1.1 Duct- Mounted Probes (refer to drawings on pages A-2 thru A-4 of Appendix A) General- VorTek probe bars are designed for installation in ducts, regardless of

the duct size. Usually, the larger the duct, the more sensing points are required to provide an accurate measurement of airflow volume. In a typical application, multiple probe support bars are directly inserted in the duct. Each probe bar has multiple VorTek sensors for measurement of the air velocity in the area of the duct it serves.

T urbulent Airflow- Probe design allows for installation in ductwork without the requirement for special air straighteners. However, care should be taken to avoid installation within close proximity to:

• Balancing dampers

• Modulating opposed blade dampers

• Non-airfoil type, parallel-blade dampers

• Elbows

• Transitions

• Humidifiers

• Coils

Refer to the drawing “Minimum Installation Requirements”, Appendix A, page A-1 for the space is available, probe bars should be located so that they have two thirds of the straight duct length upstream of the probe bars. Keep in mind that locations other than those specified as minimums often have areas with very high turbu-

minimum acceptable installation criteria for specific applications. If more

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Chapter 2 Installation

lence and reverse flow. Accurate airflow measurement is impossible in these locations.

Direction of Flow- VorTek airflow probe bars must be mounted so airflow direction corresponds to the direction indicated by the flow arrow on the duct mounting flange. Failure to mount the units properly will result in an erroneous or no flow output. Probes can be mounted in any plane, vertical, or horizontal without effecting the measurement quality. Sensors must be mounted straight in the airflow stream.

Temperature- VorTek probes are designed for use in normal HVAC applications. Continuous operation with temperatures over 200 degrees with standard materials of construction is not recommended. Fume hood exhaust sensors with CPVC construction have a limit of 180°. Close proximity to steam humidifiers and coils is not recommended. Should a steam valve leak when air is not flowing, temperatures in excess of the recommended maximum can occur. Moisture can also cause incorrect readings.

Airborne Contaminants- Normal dirt and dust associated with air conditioning applications will not effect sensor performance. The presence of agglomerating or sticky particles can cause performance problems and should be avoided. Should this occur, the probe bars can be removed for cleaning (see Appendix C).

Inspection- Carefully unpack and inspect the probes. If probes have been bent or broken in shipment, advise Tek-Air immediately.

Installation- Probes are mounted across the duct and attach to the duct on both sides. A 3 3/4" diameter hole should be located on the side of the duct where the probe will be inserted. A 5/16" diameter hole is required in the duct wall on the opposite side of the duct for probes longer than 12".

A sensor probe mounting plate is provided with a neoprene gasket and does not require the application of special sealants. The flange plate should also not be insulated to allow for easy removal if ever desired. See Diagram, Appenidix A, Page A-2.

Large ducts need multiple Probe Bars so flow can be averaged. The bars should be spaced out on the same “plane” of the duct so the sensors are located to pick up the flow. Refer to the A

, A2, A3,A4 (as required) dimensions on submittal schedule.

2.1.2 Fan Inlet- Mounted Probes (refer to drawings on pages A-5 thru A-10 in Appendix A) General- The VT-7000 Series Vortek Fan Inlet Probes are in pairs of bars for

each inlet. For single-inlet fans, one pair is provided. For double-inlet fans, two pairs are provided. One Transmitter serves all bars in the one or two-pair set. On bars sized for fan inlet diameters of 24" I.D. or less, the bar electronics are mounted in an enclosure which mounts separately from the bars and is permanently connected to the bars via flexible non-metallic conduit. On bars sized for fan inlet diameters greater than 24" I.D., the bar electronics are housed in enclo-

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Chapter 2 Installation

sures which are mounted in the center of each bar. In both cases the bar electronics connect to the Transmitter via prefab cables, which are factory-connected to the bar electronics enclosures.

Direction of Flow- The probes must be positioned so that they face into the airflow: the Safety Cables on the ends of the bars leading and the mounting brackets facing back into the fan inlet bell. On bars for fan inlets over 24" I.D., the bar electronics controller has an airflow direction label affixed to it for your convenience.

Mounting the Probe Bars- Hold the bars in place as shown in the drawing (choose the drawing that matches the fan type which you are working with). Make sure the bars are positioned as described above. Mark, on the inlet bell surface, the mounting hole locations of the brackets on the ends of the bars. Remove the bars from the inlet and drill pilot holes for #14 self-tapping screws where you marked them.

out of the fan inlet bell,

Remove the brackets from the ends of the bars ( nuts and Safety Cables). Screw the brackets to the inlet bell surface using thread locking compound and #14 self-tapping screws.

Re-attach the bars to the installed mounting brackets, being careful to face the bars in the correct direction, and to re-attach the Safety Cables as they were before. Tighten the NyLok nuts on the bar mounting bolts sufficiently to prevent loosening of the nuts through vibration. Note: If a screw, nut, or bolt is stripped, replace it with the same type fastener. If a drilled pilot hole is stripped, DRILL ANOTHER HOLE and move the probe according.

DO NOT USE STRIPPED HOLES OR FASTENERS AS DAMAGE TO THE PROBES AND FAN CAN RESULT FROM PROBES COMING LOOSE AND BEING DRAWN INTO THE FAN WHEEL!

Stretch the Safety Cables outward from the bars towards the outside of the fan, leaving no slack in the cable. The eyelet on the end of the cable must be screwed to a sturdy, metallic surface such as the bell, fan casing, or bearing support. Mark where you intend to srew the eyelets, and drill #14 self-tapping screw pilot holes. Using thread locking compound and #14 self-tapping screws, screw the eyelets down, tighening the screws sufficiently to prevent loosening due to vibration, but DO NOT STRIP THEM!

be careful not to lose the bolts,

Run the cables out to where the Transmitter will be mounted, leaving sufficient slack to allow easy plugging and unplugging of the cables into the transmitter receptacles.

2.2 Transmitter Mounting and Location

General- The transmitter is typically located in close proximity to the duct inser-

tion probe bars and transmits a 4-20mA signal over long distances to the customers control system.

Transmitter Location- The VorTek transmitter is small and designed for mount-

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Chapter 3 Startup Adjustments

ing either on the duct or on a wall, column, or other support close to the point of measurement. The transmitter housing is a general purpose enclosure and is therefore not designed for mounting outdoors or in areas requiring explosionproof classification. For outdoor use, a Nema 4 enclosure can be purchased as an option. For installation in explosion-proof areas contact factory. Areas where the temperatures are expected to exceed 125° F for extended periods of time are to be avoided.

2.3 Probe and Transmitter Connection

Probe Connection- Ten foot connecting cables are provided for each insertion probe.

This cable has a shielded 8 pin connector from the probe electronics enclosure and is plugged into either connector on the bottom of the transmitter.

CABLE CONNECTORS

Probes should be plugged in to the transmitter in numeric sequence (ie. 1, 2, 3, 4). If one probe is used it should be plugged into connector 1. If three probes are used they should be plugged into connectors 1, 2, and 3. It is not important however which probe is plugged in to a particular connector. After connectors have been plugged in it is advisable to anchor them with tie wraps.

2.4 Transmitter Wiring

Terminations- Inside the transmitter on the bottom right are two pairs of terminals. The

left most pair are the signal output terminals. (See Fig. 3) The right most are for 24VAC Power input. Transmitter power is 24 Volts AC, 8VA maximum current. Power may fluctuate ±20% without effect.

Signal and power wiring can be run in a common shielded cable or separately. If run separately, signal cable should be shielded. In either case, shields should be tied to the input device (controller) common and taped back on the other end. (See Fig. 2) T ypically, shields are terminated at the controller.

CONDUIT ENTRY

TRANSMITTER

Probe Cable Connection Points

Figure 1

Output Signal- T ransmitter output is 4-20mA and is capable of driving up to 650 ohms of load. Control equipment which accepts voltage inputs can be accommodated with internal jumpers that will generate a 1-5VDC output or a 2-10 VDC output. SEE DRAWING ON NEXT PAGE.

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Chapter 3 Startup Adjustments

- +

4-20ma

OUTPUT

24 VAC

POWER

SHIELD

Tie to Controller Common

Transmitter Power and Signal Wiring

3.0 STARTUP ADJUSTMENTS

3.1 General Description

The VorTek airflow transmitter has several modes of operation which are determined by setting the four position DIP (Dual Inline Package) switch located on the upper right corner of the mother board. This switch is utilized for adjusting the damping, transmitter zero check, and quick calibration check.In addition to this switch, potentiometers are available for adjusting T ransmitter Zero, Full Scale, Frequency

Tape Back Drain Line

at Transmitter &

Figure 2

24VAC

POWER

CONTROLLER COMMON

INPUT

+ -

Offset, and digital indicator output. See Figure 3 below.

ZERO

SPAN

OFFSET

DISPLAY

DISPLAY OUTPUT

JP2 JP3

TP1

SIGNAL

POWER

TP5

SETUP

DIP

TRANSFORMER

MOTHER

BOARD

RIBBON

CABLE

AMPLIFI ER

BOARD

PROGRAM

MODULE

JUMPERS

ZERO

SPAN

OFFSET

DISPLAY

PROBE BAR INPUTS

DISPLAY OUTPUT

TP5

SETUP

DIP

TP1

SIGNAL

POWER

PROGRAM

MODULE

MOTHER

BOARD

THRESHOLD POT.

JP1 (3-pin)

Figure 3 - Vortek Mother Board, (left); VorTek mother board showing Amplifier board installed (right).

TRANSFORMER

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Chapter 4 Calibration and Maintenance

Transmitter output checks can be made by connecting a voltmeter set for DC milliamps, in series as follows;

DVM

SIGNAL POWER

2.34

- +

24VAC

3.2 Normal Operation

In order for the transmitter to function properly as a flow measurement device the DIP switch must be set as follows;

DIP 1 On or Off DIP 2 On DIP 3 On DIP 4 Off

3.3 Damping Adjustment

Damping can be set by using DIP switch number 1. With switch one in the “on” position minor damping is in effect. With switch one in the “off” position the normal damping is doubled.

+ -

Figure 4

SIGNA L W IRES

3.4 Zero Check

Transmitter zero output (4-20mA) can be simulated by setting DIP switches 2, 3, and 4 as follows, and removing the probe connectors from the bottom of the transmitter;

With the voltmeter set for milliamps and connected in series (See fig. 4) with the 420mA output, the zero-flow output can be adjusted by utilizing the zero calibration potentiometer. At these settings the meter should read 4mA. Reinstall the probe connectors when complete. Remember to return DIP switches to normal operation or continue on to Quick Calibration Check.

DIP 1 On or Off DIP 2 Off DIP 3 Off DIP 4 Off

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Chapter 4 Calibration and Maintenance

3.5 Quick Calibration Check

Transmitter calibration can be checked quickly by setting DIP switches 2, 3, and 4 as follows, and then removing the probe connectors from the bottom of the transmitter;

DIP 1 On or Off DIP 2 Off DIP 3 Off DIP 4 On

The proper output of the transmitter can be established by making the following calculation. Full scale Hz data can be obtained from the transmitter label on the front door;

Expected mA= [16*(122/Full Scale Frequency Hz)]+4

If the value observed does not agree with the value expected, ±0.5% full scale, then the transmitter may require recalibration. The use of this internal frequency standard for calibration of full scale values is possible but will not be as accurate as calibration using a frequency generator set at full scale Hz.

3.6 Threshold Adjustment

The threshold adjustment is normally made on a calibration bench. However, the threshold can be set empirically in the field by following the procedure in section 4.2. The threshold adjustment serves to limit the lower operating limit of the transmitter to increase sensitivity at low flow conditions.

Threshold is factory set at a point equivalent to 350 FPM. Below this level the threshold circuit forces the output to go to 4.0 ma. Lowering the threshold below 350 increases chances that the transmitter may show flow when none is present if a high ambient noise condition is present.

The threshold should only be adjusted if the transmitter indicates flow when in fact there is none present. Before adjusting, check to see that zero is properly adjusted. Then, with no flow in the duct, turn the threshold adjustment clockwise until the transmitter indicates 4 ma.

4.0 CALIBRATION & MAINTENANCE

4.1 Field Calibration

The VorTek transmitter comes calibrated for the CFM or FPM specified by the customer. The calibration factor is established as a function of the type of VorTek sensor utilized in the construction of the probe bars. These calibration factors are established by test and represent flow conditions expected when normal Minimum Installation Requirements are observed. (See Appendix A, page A-1)

When these conditions are not present and duct turbulence is a problem, corrections may be required to match flow transmitter output to readings observed by traverse. In these cases transmitter span can be adjusted to read the desired output. Adjustment of transmitter span will not effect transmitter zero.

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Chapter 4 Calibration and Maintenance

For best results, a traverse should be done with the airflow at a fixed CFM. This can be done by: Fixing the output to the damper/valve which throttles the air in that duct, or by removing the output to the valve/damper, and keeping all doors closed in the area that is affected by this airflow.

The CFM reading can then be compared to the transmitter output. A milliamp meter should be connected in series with the output signal wires. (refer to figure 4 on page 11). The reading will fall between 4 and 20 mA. Use the formula below to convert the mA value to the equivalent CFM. The transmitter Full Scale CFM can be found on the transmitter enclosure.

Current Transmitter CFM Value = [Full Scale CFM/16]*(milliamp reading - 4) If the transmitter CFM reads differently than the traverse, then an adjustment can be

made. If there is a front end system receiving the control signal. A multiplication constant should be added to the scaling formula to agree with a balancer reading. If this is not possible, the transmitter itself can be adjusted. First calculate the corresponding milliamp value which matches the traversed CFM with this formula:

New desired mA value = [(traversed CFM/Transmitter Full Scale CFM)* 16]+4 Turn the span potentiometer (see figure 3) clockwise to increase the mA signal, counter

clockwise to decrease the signal, until the desired mA signal is output.

4.2 Bench Calibration

Full transmitter calibration is normally calibrated at a bench, although it is possible to bring the bench calibration instruments to the transmitter in the field. Connect a digital voltmeter to the transmitter as shown in figure 4. A frequency generator is required and can be used in conjunction with a Multi-meter. The full procedure is as follows.

Set Zero- Set switches 2, 3, and 4 to “OFF”. Adjust the “ZERO” potentiometer until 4.00 mA is read on the digital voltmeter.

Set Full Scale- (see figure 5, next page) Set switches 2, 3, and 4 off. Connect the negative lead of the frequency generator to TP 1 on the mother board (next to the wire connectors). Connect the positive lead to TP 5. Set the generator to the full scale Hertz indicated on the label fixed to the transmitter enclosure. Set the frequency generator to

sinusoidal

ometer until the output reads 20.0 mA. Turn the span potentiometer clockwise to increase the mA signal, counter clockwise to decrease the signal.

Set Optional Display- With the above connections and settings in place from the previous step, adjust the “DVM” potentiometer to read the appropriate scale display value. As the maximum display is 1999, a multiplier of x10 or x100 may have to be utilized to get the total CFM display.

Threshold Adjustment- With the above connections and settings in place from the previous step, set the frequency generator to approximately 60 Hz. Turn the “THRES” potentiometer clockwise until the transmitter output switches to 4 ma. Then, slowly turn the “THRES” adjustment counter clockwise until the output switches back to a reading other than 4 mA. Threshold is now set.

wave and the output voltage to the minimum level. Adjust the span potenti-

Return To Service- Return switches 2 and 3 to the “ON” position prior to returning the unit to service.

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Chapter 4 Calibration and Maintenance

4.3 Offset Adjustment

The tag on the transmitter enclosure may have two separate values for frequency; Full scale Hz and Span Hz. If this is the case, the transmitter was factory calibrated with an offset. To set the offset, follow the set up procedure in 4.2 first. Next turn the offset potentiometer (see figure 5) counter clockwise all the way. Now input the span frequency to the transmitter, and adjust the span potentiometer until the output is 20.0 mA. Next input the Full Scale frequency. The mA output will go up. Turn the offset potentiometer clockwise until the output is 20.0 mA again. The adjustment is complete.

4.4 Calibration Check

1. Follow the setup instructions shown in section 4.2 (in the “Set full scale” section) of the manual.

2. The check should include 3 points: 1/2 full scale frequency, 3/4 full scale frequency, and the full scale frequency. Input these frequencies using the method in “Set full scale”. The transmitter output will be 12 mA, 16 mA, and 20 mA respectively.

3. If the calibration does not match the above, recalibration will be required. The calibration should match the entire range of operation. If it agrees at the maximum frequency but not in the center, there may be a problem with the way the unit is configured. It is likely that jumper JP 1 is not set properly. It should be in the down position if full scale frequency is greater than 600 Hz.

4.5 Wave form check with an oscilloscope

Voltage Input - See figure 5, below. Set up the oscilloscope to read wave forms clearly

on the screen. To check the power input, set the scope to read 24VAC. Touch the negative test lead to either screw in the power wire connector (A), and the positive lead to the other screw. The screen should read 60Hz.

Connect the negative lead to the test point 1 (TP1) (B) on the mother board. Connect the positive lead to one of the exposed metal jumpers (C) on the amplifier board. A clean, square wave should appear, and the numerical frequency value should not bounce more the 20% for a good signal. Check each of the thin metal jumpers and read the values. The average frequencies of the jumpers should be fairly close in value. If there are two amplifier boards on top of the mother board, the top amplifier board must be removed.

DISPLAY

PROGRAM

OUTPUT

MODULE

MOTHER

BOARD

THRESHOLD POT.

ZERO

SPAN

OFFSET DISPLAY

TP5

SETUP

DIP

TRANSFORMER

TP1

MOTHER

BOARD

RIBBON

CABLE

SUMMI NG

BOARD

PROGRAM

MODULE

JUMPERS

DISPLAY

ZERO

SPAN

OFFSET

DISPLAY OUTPUT

TP5

SETUP

DIP

TRANSFORMER

TP1

JP1 (3-pin)

JP2 JP3

Figure 5 - Vortek Mother Board, (left); VorTek mother board showing summing board (right).

SIGNAL

POWER

PROBE INPUTS

SIGNAL

POWER

16VORTEK Doc.# VT5 OM 050499, Rel. 2.1

Page 17

Chapter 4 Calibration and Maintenance

Output Signal

always at 4mA

Flow Above

350 FPM with

Linear Profile?

DIPs

Set to Operate?

Probe Cables

Plugged in?

Establish

Flow in Duct

Set as Follows: 1-Either ON or OFF 2-ON 3-OFF 4-OFF

Plug in

Cables

Contact Tek-Air Systems

for Assistance

Yes

Probes in

Backwards?

Yes

Reinstall in

Proper Direction

4.6 Trouble Shooting

The following flow charts are designed to aid in trouble shooting the transmitter and flow sensors should problems be experienced in commissioning the airflow measurement system.

No Signal

Output

a. Open Circuit b. Loop resistance above 650 Ohms c. Short to ground i n “+” wire

24VAC

Present

Yes

Output

Polarity Correct?

Yes

No_ Output

w/signal lines connected

Output w/signal lines

Disconnected

Yes

Correct possible signal

transmission line problems

Correct

Power

(Maintain Polarity)

Correct Polari ty

Contact

Tek-Air Systems

for Assistance

17VORTEK Doc.# VT5 OM 050499, Rel. 2.1

Page 18

Chapter 4 Calibration and Maintenance

Yes

High or Constant

Output, Output

w/No_ Flow Present

in duct (verified)

DIPs

Set to Operate?

Yes

Unplug Cables,

4mA?

Check Zero

(Section 3.4)

4mA?

Set as Follows: 1-ON or OFF 2-ON 3-ON 4-OFF

Contact

Tek-Air Systems

for Assistance

Large Difference between

actual Measured CFM &

Vortek indicated CFM

DIPs

Set to Operate?

Yes

Probes in

Proper Locati on?

Yes

Unit may be out of calibration.

See section 4.1, Field Calibration

Set as Follows: 1-Either ON or OFF 2-ON 3-ON 4-OFF

Relocate probes; refer to

Appendix 1, Page A-1

Yes

Probes

mounted in duct

Backwards?

Yes

Plug-in Cables

Place Unit in

Operation

Reinstall in

Proper Directi on

18VORTEK Doc.# VT5 OM 050499, Rel. 2.1

Page 19

19VORTEK Doc.# VT5 OM 050499, Rel. 2.1

Page 20

Appendices Appendix A

General Notes

X = Average Duct Dimension

Dampers

Duct Transitions

Fans

Angle Fittings

Centrifugal Inlet

Centrifugal Discharge

Vane-Axial Discharge

Elbows

Sweep

90° Vaned

Duct Take-Offs

Hoods

Formulas

>15°

<15°

(12" Min)

Not

Recommended

30°

Bell Transition

D = Diameter

H = Height in InchesW = Width in Inches

Rect. Duct Area =

W x H

144

Circ. Duct Area =

144

Design CFM

Duct Area

Design Velocity =

Duct Velocity

3020

Oval Duct Area =

+ ((W - H) x H)

144

Probe Velocity

Pressure =

Engineering Department

43 Beaver Brook Road

Danbury, CT 06810

(203) 791-1400 Phone

(203) 798-6534 Fax

VorTek

Airflow Measuring Probes

Minimum Installation Requirements

& Formulas

Revision Letter: A

Dwg. No:

Revision Date: 4/21/97

Filename: VT-MIN.CDR

Drawn By: GV

20VORTEK Doc.# VT5 OM 050499, Rel. 2.1

A-1

Page 21

Appendices Appendix A

Engineering Department

43 Beaver Brook Road

Danbury, CT 06810

(203) 791-1400 Phone

(203) 798-6534 Fax

VorTek

Installation Drawing

Revision Letter: A

Index No: 1-1

Revision Date: 12/11/96

Filename: T-VT5100A.CDR

Drawn By: GV

SENSOR ENCLOSURE AND

NOTES:

1. INSTALL IN ACCORDANCE WITH AIRFLOW DIRECTION

INDICATOR.

2. FOR QTY. OF PROBES & SENSORS PER PROBE

SEE SCHEDULE.

3. FOR SINGLE BAR UNITS USE PROBE ASS'Y 1 ONLY.

FOR UNITS WITH TWO BARS USE PROBE ASS'Y 1 & 2.

4. FOR DUCT DIAMETERS OF 14" OR LESS PROBE IS

CAPPED WITH NO STUDS OR NUTS PROVIDED.

IN THIS CASE, NO (5/16") HOLE SHOULD BE DRILLED.

SLOT IN ROD TO BE

ALIGNED WITH AIRFLOW

DIRECTION

SECTION A-A

PROBE ALIGNMENT SLOT

REQ'D FOR ALL BARS

DUCT CROSS SECTION

MOUNTING PLATE

PROBE BAR

PREFAB CABLE

SENSOR CLAMP

SHEDDER BAR

SHROUD

TO TRANSMITTER

TYPICAL SENSOR

(FOR QTY. OF SENSORS

PER PROBE SEE SCHEDULE).

PROBE ASS'Y 1

STRAIN RELIEF FITTING

PROBE ASS'Y 2

(IF APPLICABLE)

5/16" STUD

W/LOCK NUTS

(SEE NOTE 4)

DUCTWORK FOR

INSERTION OF PROBE

MOUNTING PLATE

CONNECTION CABLE

INSERTION SIDE

#10 TEK

SCREW (TYP.)

(INCLUDES INTEGRAL GASKET)

3 3/4" DIA. HOLE IN

6" X 6"

Airflow Measuring Probes

Circular Duct Insertion Probes

Selection of Materials For Construction

Aluminum

& ABS

CPVC

& ABS

304 St Steel High Temp.

St. Steel

21VORTEK Doc.# VT5 OM 050499, Rel. 2.1

A-2

Page 22

Appendices Appendix A

Engineering Department

43 Beaver Brook Road

Danbury, CT 06810

(203) 791-1400 Phone

(203) 798-6534 Fax

VorTek

Revision Letter: A

Index No: 1-2

Revision Date: 12/6/96

Filename: T-VT5200B.CDR

Drawn By: GV

Airflow Measuring Probes

Installation Drawing

Rectangular Duct Insertion Probes

CROSS SECTION

MOUNTING ACROSS WIDTH

#10 TEK

SCREW

MOUNTING

INSERTION SIDE

AIRFLOW

RECEIVING SIDE

MOUNTING

3 3/4" DIA HOLE IN

DUCTWORK FOR

INSERTION OF PROBE

MOUNTING PLATE

BOTTOM OF DUCT

TOP OF DUCT

5/16" DIA. HOLE TO

RECEIVE PROBE SUPPORT

END

FOR QTY. OF SENSORS

PER PROBE SEE SCHEDULE

(TYPICAL)

5/16" THREADED ROD

WITH JAM NUTS

(PROVIDED)

SENSOR ENCLOSURE AND

CONNECTION CABLE

RECEPTACLE

4" x 4"

(WITH INTEGRAL GASKET)

INLET VIEW

TYPICAL SENSOR

SHEDDER BAR

SHROUD

SENSOR CLAMP

PROBE BAR

FOR APPLICABLE

HOLE LOCATIONS

SEE SCHEDULE.

FOR QTY. OF PROBES

SEE SCHEDULE

SEE NOTE 4

NOTES:

1. INSTALL IN ACCORDANCE WITH AIRFLOW DIRECTION

INDICATOR.

2. FOR QTY. OF PROBES & SENSORS PER PROBE, SEE SCHEDULE.

3. FOR UNITS WITH 2 PROBES, USE LOCATIONS A1 & A3 ONLY.

4. PROBES 14" LONG OR LESS ARE CAPPED WITH NO STUDS OR

NUTS PROVIDED. IN THIS CASE, NO (5/16") HOLE SHOULD

BE DRILLED.

CROSS SECTION

MOUNTING ACROSS HEIGHT

INLET VIEW

SLOT IN ROD TO BE

ALIGNED WITH AIRFLOW

DIRECTION

SECTION A-A

PROBE ALIGNMENT SLOT

REQ'D FOR ALL BARS

Selection of Materials For Construction

Aluminum

& ABS

CPVC

& ABS

304 St Steel High Temp.

St. Steel

22VORTEK Doc.# VT5 OM 050499, Rel. 2.1

A-3

Page 23

Appendices Appendix A

Engineering Department

43 Beaver Brook Road

Danbury, CT 06810

(203) 791-1400 Phone

(203) 798-6534 Fax

Installation Drawing

VorTe k

Oval Duct Insertion Probes

Revision Letter: B

Dwg. No:

Revision Date: 4/2/97

Filename: VT5300G.CDR

Drawn By: GV

For Qty. Of Sensors Per Probe

See Schedule.

Typical Sensor

Probe Bar

For Qty. Of Probes

See Schedule

Shedder Bar

Sensor Clamp

Shroud

5/16" Dia. Hole To

Receive Probe Support

End (Typical).

MOUNTING RECEIVING

Bottom View

MOUNTING INSERTION

Top View

3 3/4" Dia Hole In

Ductwork For

Insertion Of Probe

Sensor Enclosure And

Connection Cable Receptacle

(includes Integral Gasket)

#10 Tek

Screw (typ.)

Inlet View

Slot In Rod To Be

Aligned With Airflow

Direction

Section A-A

Probe Alignment Slot

Req'd For All Bars

Selection of Materials For Construction

Aluminum

& ABS

CPVC

& ABS

304 St Steel High Temp.

St. Steel

NOTES:

1. Install In Accordance With Airflow Direction

Indicator.

2. For Qty. Of Probes & Sensors Per Probe, See Schedule.

3. For Units With 2 Probes, Use Locations A1 & A3 Only.

4. Probes 14" Long Or Less Are Capped With No Studs Or

Nuts Provided. In This Case, No (5/16") Hole Should

Be Drilled.

4“X4”X2 1/2”

5/16“ Threaded Rod

with Jam Nuts

(provided)

See Note 4

For Applicable

Hole Locations

See Schedule.

Airflow

23VORTEK Doc.# VT5 OM 050499, Rel. 2.1

A-4A-4

Page 24

Appendices Appendix A

SUPPORT BAR

FANINLET BELL

FAN BLADES

FRAME

VORTEK SENSORS

(TYP.)

24 VAC

4-20 MA. OUTPUT

CABLE TO

TRANSMITTER

24 VAC

4-20 MA. OUTPUT

SEE DETAIL "A"

TRANSMITTER

VORTEK

ELECTRONICS

PROBE

ELECTRONICS

PROBE

VORTEK

Engineering Department

43 Beaver Brook Road

Danbury, CT 06810

(203) 791-1400 Phone

(203) 798-6534 Fax

Revision Letter: A

Dwg. No:

Revision Date: 1/3/97

Filename: VT7100C.CDR

Drawn By: GV

VT-7100 Installation Drawing

Va ne - Axial

VorTek, Fan Inlet

(Greater than 25" Dia.)

NOTES:

1. USE LOCTITE ON MOUNTING BOLTS

WHEN INSTALLING UNIT .

2. FOR QTY. OF SENSORS PER PROBE

SEE SCHEDULE.

SHROUD

SHEDDER BAR

ROTATED 90° CCW

INLET BELL

DIA.

#10 TEK SCREWS

SEE NOTE 1

FA NINLET MOUNTING BRACKET

BOLT HEX HEAD

1/4-20 X 1 1/4" LG.

PROBE TUBE

DETAIL

ENLARGED VIEW

TYPICAL 4 PLACES

SAFETY

CABLE

SELF TAPPING

SCREW

(BY OTHERS)

DETAIL B

LOCATED A T

EACH END OF

PROBE

SEE DETAIL “B”

MATERIALS OF CONSTRUCTION

SENSOR CLAMP: POLYETHYLENE

SENSOR SHROUD: ANODIZED ALUMINUM

PROBE TUBE: EXTRUDED ALUMINUM, ANODIZED

SENSOR SHEDDER BAR: ABS

MOUNTING BRACKET: GALVANIZED STEEL

BOLT & NUTS: ZINC COATED STEEL

24VORTEK Doc.# VT5 OM 050499, Rel. 2.1

A-5

Page 25

Appendices Appendix A

VORTEK SENSORS

(TYP.)

SUPPORT BAR

FANINLET BELL

FAN BLADES

FRAME

TRANSMITTER

24 VAC

4-20 MA. OUTPUT

NON-METALLIC CONDUIT

TRANSMITTER

24 VAC

4-20 MA. OUTPUT

SEE DETAIL "A"

PROBE

ELECTRONICS

VORTEK

(PROVIDED)

PROBE

ELECTRONICS

VORTEK

Engineering Department

43 Beaver Brook Road

Danbury, CT 06810

(203) 791-1400 Phone

(203) 798-6534 Fax

Revision Letter: A

Dwg. No.:

Revision Date: 1/3/97

Filename: VT7100E.CDR

Drawn By: GV

NOTES:

1. USE LOCTITE ON MOUNTING BOLTS

WHEN INSTALLING UNIT.

MATERIALS OF CONSTRUCTION

SENSOR CLAMP: POLYETHYLENE

SENSOR SHROUD: ANODIZED ALUMINUM

PROBE TUBE: EXTRUDED ALUMINUM, ANODIZED

SENSOR SHEDDER BAR: ABS

MOUNTING BRACKET: GALVANIZED STEEL

BOLT& NUTS: ZINC COATED STEEL

VT-7100 Installation Drawing

Va n e - Axial

VorTek, Fan Inlet

(Less than 25“ Dia.)

SHROUD

SHEDDER BAR

ROTATED 90 CCW

INLET BELL

DIA.

#10 TEK SCREWS

SEE NOTE 1

FANINLET MOUNTING BRACKET

BOLT HEX HEAD

1/4-20 X 1 1/4" LG.

PROBE TUBE

DETAIL

ENLARGED VIEW

TYPICAL 4 PLACES

NON-METALLIC CONDUIT

(PROVIDED)

SAFETY

CABLE

SELF TAPPING

SCREW

(BY OTHERS)

SEE DETAIL “B”

DETAIL B

LOCATED A T

EACH END OF

PROBE

25VORTEK Doc.# VT5 OM 050499, Rel. 2.1

A-2A-6

Page 26

Appendices Appendix A

FAN SHAFT

VORTEK/FI

FAN SCROLL

FAN

HOUSING

SINGLE WIDTH SINGLE INLET

(SWSI) FANS

CENTRIFUGAL FAN

Engineering Department

43 Beaver Brook Road

Danbury, CT 06810

(203) 791-1400 Phone

(203) 798-6534 Fax

Revision Letter: A

Dwg. No:

Revision Date: 1/2/97

Filename: VT7200A.CDR

Drawn By: GV

VT-7200 Installation Drawing

Centrifugal (SWSI)

VorTek, Fan Inlet

(Greater than 25“ Dia.)

MATERIALS OF CONSTRUCTION

SENSOR CLAMP: POLYETHYLENE

SENSOR SHROUD: ANODIZED ALUMINUM

PROBE TUBE: EXTRUDED ALUMINUM, ANODIZED

SENSOR SHEDDER BAR: ABS

MOUNTING BRACKET : GALVANIZED STEEL

BOLT& NUTS: ZINC COATED STEEL

NOTES:

1. USE LOCTITE ON MOUNTING BOLTS

WHEN INSTALLING UNIT.

2. FOR QTY. OF SENSORS PER PROBE

SEE SCHEDULE.

SHROUD

SHEDDER BAR

ROTATED 90 CCW

INLET BELL

DIA.

#10 TEK SCREWS

SEE NOTE 1

FANINLET MOUNTING BRACKET

BOLT HEX HEAD

1/4-20 X 1 1/4" LG.

PROBE TUBE

DETAIL A

ENLARGED VIEW

TYPICAL 4 PLACES

SEE DETAIL “B”

SUPPORT BAR

PROBE

ELECTRONICS

VORTEK SENSORS

REAR (NECK) SECTION

OF BELL MOUTH SHOWN

CABLE TO TRANSMITTER

(SEE WIRING DIAGRAM)

SWIVEL MOUNTING

BASE (TYP.)

SELF TAPPING

SCREW

(BY OTHERS)

SAFETY

CABLE

DETAIL B

LOCATED A T

EACH END OF

PROBE

AIRFLOW

A-7

26VORTEK Doc.# VT5 OM 050499, Rel. 2.1

Page 27

27VORTEK Doc.# VT5 OM 050499, Rel. 2.1

Appendices Appendix A

A-8

FAN SHAFT

VORTEK/FI

FAN SCROLL

FAN HOUSING

SINGLE WIDTH SINGLE INLET

(SWSI) FANS

CENTRIFUGAL FAN

Engineering Department 43 Beaver Brook Road Danbury, CT 06810 (203) 791-1400 Phone (203) 798-6534 Fax

Revision Letter: A

Dwg. No. Revision Date: 1/3/97 Filename: VT7200E.CDR

Drawn By: GV

VT-7200 Installation Drawing

Centrifugal (SWSI)

VorTek, Fan Inlet (Less than 25“ Dia.)

NOTES:

1. USE LOCTITE ON MOUNTING BOLTS WHEN INSTALLING UNIT.

MATERIALS OF CONSTRUCTION

SENSOR CLAMP: POLYETHYLENE

SENSOR SHROUD: ANODIZED ALUMINUM

PROBE TUBE: EXTRUDED ALUMINUM, ANODIZED

SENSOR SHEDDER BAR: ABS

MOUNTING BRACKET: GALVANIZED STEEL BOLT & NUTS: ZINC COATED STEEL

NON-METALLIC CONDUIT

(PROVIDED)

NON-METALLIC CONDUIT

(PROVIDED)

VORTEK

TRANSMITTER

PROBE

SUPPORT BAR

SWIVEL MOUNTING BASE (TYP.)

VORTEK SENSORS

ELECTRONICS

VORTEK

TRANSMITTER

PROBE

ELECTRONICS

24 VAC 4-20 MA OUTPUT

SHROUD SHEDDER BAR

ROTATED 90° CCW

INLET BELL

DIA.

#10 TEK SCREWS

SEE NOTE 1

FAN INLET MOUNTING BRACKET

BOLT HEX HEAD

1/4-20 X 1 1/4" LG.

PROBE TUBE

DETAIL A ENLARGED VIEW

TYPICAL 4 PLACES

SELF TAPPING SCREW (BY OTHERS)

SAFETY CABLE

DETAIL B

LOCATED AT EACH END OF PROBE

SEE DETAIL “B”

AIRFLOW

FAN SHAFT

VORTEK/FI

FAN SCROLL

FAN HOUSING

SINGLE WIDTH SINGLE INLET

(SWSI) FANS

CENTRIFUGAL FAN

Engineering Department 43 Beaver Brook Road Danbury, CT 06810 (203) 791-1400 Phone (203) 798-6534 Fax

Revision Letter: A

Dwg. No. Revision Date: 1/3/97 Filename: VT7200E.CDR

Drawn By: GV

VT-7200 Installation Drawing

Centrifugal (SWSI)

VorTek, Fan Inlet (Less than 25“ Dia.)

NOTES:

1. USE LOCTITE ON MOUNTING BOLTS WHEN INSTALLING UNIT.

MATERIALS OF CONSTRUCTION

SENSOR CLAMP: POLYETHYLENE

SENSOR SHROUD: ANODIZED ALUMINUM

PROBE TUBE: EXTRUDED ALUMINUM, ANODIZED

SENSOR SHEDDER BAR: ABS

MOUNTING BRACKET: GALVANIZED STEEL BOLT & NUTS: ZINC COATED STEEL

NON-METALLIC CONDUIT

(PROVIDED)

NON-METALLIC CONDUIT

(PROVIDED)

VORTEK

TRANSMITTER

PROBE

SUPPORT BAR

SWIVEL MOUNTING BASE (TYP.)

VORTEK SENSORS

ELECTRONICS

VORTEK

TRANSMITTER

PROBE

ELECTRONICS

24 VAC 4-20 MA OUTPUT

SHROUD SHEDDER BAR

ROTATED 90° CCW

INLET BELL

DIA.

#10 TEK SCREWS

SEE NOTE 1

FAN INLET MOUNTING BRACKET

BOLT HEX HEAD

1/4-20 X 1 1/4" LG.

PROBE TUBE

DETAIL A ENLARGED VIEW

TYPICAL 4 PLACES

SELF TAPPING SCREW (BY OTHERS)

SAFETY CABLE

DETAIL B

LOCATED AT EACH END OF PROBE

SEE DETAIL “B”

AIRFLOW

Page 28

Engineering Department

43 Beaver Brook Road

Danbury, CT 06810

(203) 791-1400 Phone

(203) 798-6534 Fax

Revision Letter: A

Dwg. No:

Revision Date: 1/2/97

Filename: VT7300A.CDR

Drawn By: GV

FANSHAFT

FANSCROLL

SUPPORT BAR

SWIVEL MOUNTING

BASE (TYP.)

PROBE

ELECTRONICS

REAR (NECK) SECTION

OF BELL MOUTH SHOWN

CABLE TO TRANSMITTER

(SEE WIRING DIAGRAM)

VORTEK SENSORS

CENTRIFUGAL FAN

DOUBLE WIDTH DOUBLE INLET

(DWDI) FANS

VORTEK/FI

FAN HOUSING

VT-7300 Installation Drawing

Centrifugal (DWDI)

VorTek, Fan Inlet

(Greater than 25“ Dia.)

MATERIALS OF CONSTRUCTION

SENSOR CLAMP: POLYETHYLENE

SENSOR SHROUD: ANODIZED ALUMINUM

PROBE TUBE: EXTRUDED ALUMINUM, ANODIZED

SENSOR SHEDDER BAR: ABS

MOUNTING BRACKET: GALVANIZED STEEL

BOLT & NUTS: ZINC COATED STEEL

NOTES:

1. USE LOCTITE ON MOUNTING BOLTS

WHEN INSTALLING UNIT.

2. FOR QTY. OF SENSORS PER PROBE

SEE SCHEDULE.

SHROUD

SHEDDER BAR

ROTATED 90° CCW

INLET BELL

DIA.

#10 TEK SCREWS

SEE NOTE 1

FA NINLET MOUNTING BRACKET

BOLT HEX HEAD

1/4-20 X 1 1/4" LG.

PROBE TUBE

DETAIL

ENLARGED VIEW

TYPICAL 4 PLACES

SAFETY

CABLE

SELF TAPPING

SCREW

(BY OTHERS)

DETAIL B

LOCATED A T

EACH END OF

PROBE

SEE DETAIL “B”

AIRFLOWAIRFLOW

Appendices Appendix A

28VORTEK Doc.# VT5 OM 050499, Rel. 2.1

A-9

Page 29

REAR (NECK) SECTION

OF BELL MOUTH SHOWN

VORTEK

SENSORS

(AS REQ'D)

SWIVEL MOUNTING

BASE (TYP.)

SUPPORT BAR

NON-METALLIC CONDUIT

(PROVIDED)

NON-METALLIC

CONDUIT

(PROVIDED) NON-METALLIC

CONDUIT

(PROVIDED)

24 VAC

4-20 MA OUTPUT

VORTEK

TRANSMITTER

PROBE

INLET CONE

FAN SCROLL

VORTEK / FI

FANSHAFT

FAN HOUSING

PROBE

ELECTRONICS

Engineering Department

43 Beaver Brook Road

Danbury, CT 06810

(203) 791-1400 Phone

(203) 798-6534 Fax

Revision Letter: A

Dwg. No:

Revision Date: 1/2/97

Filename: VT7300D.CDR

Drawn By: GV

CENTRIFUGAL FAN

NOTES:

1. USE LOCTITE ON MOUNTING BOLTS

WHEN INSTALLING UNIT.

MATERIALS OF CONSTRUCTION

SENSOR CLAMP: POLYETHYLENE

SENSOR SHROUD: ANODIZED ALUMINUM

PROBE TUBE: EXTRUDED ALUMINUM, ANODIZED

SENSOR SHEDDER BAR: ABS

MOUNTING BRACKET: GALVANIZED STEEL

BOLT & NUTS: ZINC COATED STEEL

VT-7300 Installation Drawing

Centrifugal (DWDI)

VorTek, Fan Inlet

(Less than 25" Dia.)

SHROUD

SHEDDER BAR

ROTATED 90° CCW

INLET BELL

DIA.

#10 TEK SCREWS

SEE NOTE 1

FA NINLET MOUNTING BRACKET

BOLT HEX HEAD

1/4-20 X 1 1/4" LG.

PROBE TUBE

ENLARGED VIEW

TYPICAL 4 PLACES

DETAIL A

SELF TAPPING

SCREW

(BY OTHERS)

SAFETY

CABLE

DETAIL B

LOCATED AT

EACH END OF

PROBE

AIRFLOWAIRFLOW

Appendices Appendix A

29VORTEK Doc.# VT5 OM 050499, Rel. 2.1

A-10

Page 30

Appendices Appendix B

Proper procedure for the cleaning of VorTek Airflow Measuring Probes

The Tek-Air Systems, Inc. VorTek Airflow Measuring Probe is a very versatile flow

measuring station that is used in many types of applications. Some of these applications include use in harsh environments such as pharmaceutical pill coating areas, dirty exhaust systems, etc. In some instances the VorTek flow stations may become fouled and require some careful cleaning to insure their long-term operation. These cleaning tips and concerns are detailed below:

1) The VorTek probe(s) must first be carefully removed from the ductwork noting the orientation of the sensors.

a) VorTek VT-2000 (Small Duct) - The transmitter is attached to the probe bar

with flexible hose which can not be disassembled and must be removed as a complete unit.

b) VorTek S (Standard) - The probe bar(s) may be disconnected from the trans-

mitter simply by pulling off the connector from the microphone board, and undoing the romex connection on the enclosure.

2) The probes then can be evaluated as to the extent of fouling buildup and the composition of the buildup.

a) Buildup of the non-hardening type, such as dust and fiber collection, can be

simply blown off using compressed air.

Note: EXTREME CAUTION MUST BE USED WHEN CLEANING WITH COM-

PRESSED AIR. THIS INCLUDES MAKING SURE THAT THE FULL PRESSURE OF THE AIR (NOT TO EXCEED 20 PSI) IS NEVER DIRECTLY AIMED IN THE BACK OF THE SENSOR IN THE SMALL SENSOR TUBES AS THIS CAN DAMAGE THE PROBE.

b) Buildup including both the hardening and non-hardening type can be cleaned

by first removing as much as possible with compressed air. The remaining buildup may be removed with combinations of alcohol, compressed air, and possibly the use of a lint free cloth. When “wiping” with a cloth, caution must be taken so as not to push any fouling agent into the sensing tubes located at the back of the sensors. If these holes are plugged to any extent, improper readings will be observed.

Water is not usually recommended for cleaning VorTek probes due to the fact

that the sensor tubes may become entrained with fluid and block the sensor.

30VORTEK Doc.# VT5 OM 050499, Rel. 2.1

B-1

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