TSI Instruments ALNOR LOFLO BALOMETER Bedienungsanleitung

ALNOR®LOFLO BALOMETER®

CAPTURE HOOD

OWNER’S MANUAL

P/N 116620001, REV 08

SEPTEMBER 2014

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TABLE OF CONTENTS

Section 1 General Description................................................1

Section 2 Theory of Operation................................................1

Section 3 Safety......................................................................2

Section 4 Instrument Setup and Storage................................2

Section 5 About the Instrument Display..................................4

Section 6 Getting Started........................................................5

Section 7 Detailed Operation..................................................5

Section 8 Troubleshooting......................................................8

Section 9 Maintenance...........................................................9

Section 10 Service Information...............................................10

Appendix A Correction Factors for Standard

Flow Rate to Actual Flow Rate .............................11

Appendix B Model 6200 LoFlo Balometer®Capture Hood Field

Setting Instruction for User Programmable

Correction Factors ................................................12

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SECTION 1

General Description

The Alnor®LoFlo Balometer®Capture Hood is a

compact instrument that measures very low air

flow rates in HVAC systems. It measures from 10

to 500 cfm (17 to 850 m3/h, 4.7 to 236 l/s). The

LoFlo Balometer®Capture Hood displays standard

air volume rate when placed at supply or return

diffusers, registers, or grilles located on the

ceiling, wall, or floor.

The LoFlo Balometer®Capture Hood has a vent

mechanism which reduces the restriction of air

flow caused by the instrument. This unique venting

system (patent pending) allows the instrument to

remain compact while still measuring a wide range

of volume rates. The LoFlo Balometer®Capture

Hood should be used with the vents closed at

lower volume rates, but higher volume rates

should be measured with the vents open to

minimize any resistance effects. A 2-point

measurement may be taken to compensate for the

resistance effect of the instrument at higher

volume rates.

The LoFlo Balometer®Capture Hood is battery

powered and may be used with or without optional

hoods. It weighs just over 6 pounds with the 2' x 2'

hood, helping to reduce worker fatigue.

SECTION 2

Theory of Operation: Capture Hoods

and Thermo-anemometry Sensing

As air exits a diffuser, it is captured in the hood or

base and directed over a manifold. The manifold

averages the velocity pressure and directs air over

the sensors. The velocity and temperature of the

air passing through the manifold are sensed, using

a constant temperature thermo-anemometer

principle. The voltage output from the sensor is

then calibrated for the entire volume rate passing

through the LoFlo Balometer®Capture Hood.

All capture hoods are susceptible to “odd” air flow

patterns. “Odd” could refer to any air flow pattern

different from the pattern where it was calibrated.

Substantial negative effects can be observed

when using a large hood on a small diffuser. For

example, using a 2' x 2' hood on a 10" x 10"

diffuser. This creates large recirculation regions on

the sides of the fabric hood and causes an “odd”

air flow pattern as it passes over the manifold. It is

recommended to match the hood closely to the

size of the diffuser.

NOTE: Throughout this manual, the units cfm,

m3/h and l/s are used for simplicity. Note,

however, that the LoFlo Balometer®Capture

Hood actually reads in standard cubic feet per

minute (scfm), standard cubic meters per hour

(std. m3/h), or standard liters per second

(std. l/s).

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SECTION 3

Safety

When using the LoFlo Balometer®Capture Hood

to check air flow at ceiling diffusers, make certain

that you can safely raise and hold the unit while

making measurements. Be especially careful

when working on a ladder.

Observe all necessary precautions so that the unit

does not become caught in moving machinery or

touch any exposed electrical wiring.

The LoFlo Balometer®Capture Hood is not

designed for gas mixtures other than air. Use with

corrosive or other dangerous or explosive gas

mixtures is not recommended and is at the user’s

risk.

C A U T I O N

WHILE USING THE LOFLO BALOMETER®INSTRUMENT TO TEST AIR FLOW IN DUCTS,YOU

MAY COME INTO CONTACT WITH OR BE EXPOSED TO DUST,POLLEN,MOLD,FUNGUS,OR

OTHER AIRBORNE CONTAMINANTS.IF YOU ARE OR MAY BE SENSITIVE TO DUST,POLLEN,

MOLD,FUNGUS,OR OTHER AIRBORNE CONTAMINANTS,ALWAYS USE AN APPROPRIATE

MASK OR RESPIRATOR WHILE EMPLOYING THE LOFLO BALOMETER®INSTRUMENT.

SECTION 4

Instrument Setup and Storage

Hood Setup

1.Locate the four (4) aluminum channels for the

hood and position them into a square with the

foam facing up. Slide the “U” opening on the

channel end (Fig. 1) and corner bracket

toward the brass eyelets until you feel it latch.

2.Continue with the other two channels until you

have a square frame that is locked tightly in all

four corners.

3.Locate the hood for the frame size you have

assembled.

4.Position a corner seam of the hood onto the

corner of the frame. Stretch the nylon hood to

an adjacent corner until the hood corner

meets the frame corner.

5.Push the elastic cord into the channel along

the side of the frame.

6.Repeat steps 4 and 5 until the hood assembly

is complete and ready to mount onto the base.

7.Place hood on a table or clean floor with the

base inside the opening. Pull the hood over

the base. Rotate the hood assembly until the

metal cups are above the spring-loaded pins.

8.Locate the hood support rods. Extend the

hood so it is taut and insert one support rod

onto the spring-loaded pin closest to you.

9.Push the support rod down and insert the top

end of the rod into the metal cup on the hood

frame. Fig 1.

10. Install the rod on the opposite side then install

the last two rods.

Figure 1

Hood Frame Channel

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Instrument Storage

The hood and frame assemblies can be detached

from the instrument base and placed inside their

own carrying case without disassembly.

The LoFlo Balometer®Capture Hood should

always be turned off before re-packing the

instrument. If storing the LoFlo Balometer®

Capture Hood for an extended period of time,

remove the batteries to prevent damage due to

leakage.

Battery Installation

To install the 4 C-size batteries that ship with the

LoFlo Balometer®Capture Hood:

1. Make sure the LoFlo Balometer®Capture

Hood switch is off.

2. Remove the battery cover located on top of

the meter.

3. Slide the battery holder up until the snap

connector is exposed.

4. Disconnect the battery holder from the LoFlo

Balometer®Capture Hood.

5. Install the 4 C size batteries in the holder.

6. Reconnect the snap connector and slide the

battery holder into the battery compartment.

7. Replace battery cover.

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SECTION 5

About the Instrument Display

This display is an analog display, simulated with

26 LCD segments to give the user the response of

a mechanical Balometer®Capture Hood. It also

displays an exact digital number, using 3½ digit

numeric section. The LCD has indicators for

supply, return, manual range, vent modes, and low

battery.

Figure 3 shows the front of the LoFlo Balometer®

Capture Hood.

Index No.

Name

LCD

On/Off Switch

Supply/Return Button

Manual Range Button

Handle Button

Battery Holder

Vents

Vent Open/Close Slide

Figure 4 shows the LCD.

Index No.

Name

Digital Readout

Simulated Analog Display

Manual Range Indicator

Supply/Return Indicator

2-Point Mode Indicator

Vent Indicator

Units Indicator

Low Battery Indicator

Figure 3

Front View of LoFlo Balometer®Capture Hood

Figure 4

LoFlo Balometer®Capture Hood LCD

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SECTION 6

Getting Started

NOTE: The instrument should be allowed to

stabilize to room conditions in order to achieve

specified accuracy.

1. If you are using a hood with the unit,

assemble the LoFlo Balometer®Capture

Hood as described in Section 4, “Instrument

Setup and Storage.”

2. Turn on the unit using the slide switch

located on the right side of the meter.

3. When turned on, the LoFlo Balometer®

Capture Hood displays the vent closed

indicator. Close the vent on the base by

turning the top baffle counter clockwise.

4. Select the proper mode for air flow direction,

supply or return.

5. Place the LoFlo Balometer®Capture Hood

over the diffuser or grille to be measured.

6. The auto range feature of the LoFlo

Balometer®Capture Hood will choose the

correct scale and display the volume rate in

the digital readout section. A quick press on

the handle switch will freeze the display.

7. Another quick press will unfreeze the display.

8. For volume rates above 150 cfm (255 m3/h,

71 l/s), it is recommended to use the vent

open mode to minimize air flow resistance

effects. See Section 7, “Detailed Operation.”

NOTE: Make sure that there are no gaps

between the LoFlo Balometer®Capture Hood

and the surface around the diffuser or grille.

Also, make sure that your body or other objects

are not blocking or diverting the air flow where

the air is exiting (supply) or entering (return).

This will affect the reading.

SECTION 7

Detailed Operation

Handle Button

In 1-point mode, the handle button will freeze the

digital reading and flash the value when it is

pressed for less than three seconds. When the

handle button is pressed for more than three

seconds, it switches the LoFlo Balometer®

Capture Hood between vent closed mode and

vent open mode.

In 2-point mode, the handle button cycles the

instrument through the 2-point measurement

process. See 2-point mode section for detail.

Auto/Manual Ranging Button

When turned on, the instrument is in auto-range

mode. The user can switch to manual range mode

by pressing the range button. The manual range

indicator will show. By pressing the range button,

the meter display switches to the next volume

range. To return to auto-range mode, press and

hold the range switch until the manual range

indicator disappears.

Changing Measurement Units

To change measurement units:

1. Turn the instrument off.

2. Press and hold the supply/return button and

switch the instrument on at the same time.

3. The display will flash one of the three

available measurement units: cfm, m3/h, l/s.

4. Press and hold the supply/return button or the

range button to scroll through the

measurement units.

5. When the units you desire are displayed,

switch the instrument off.

6. When you turn the instrument on again, your

chosen units will be displayed.

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Supply/Return Button

The LoFlo Balometer®Capture Hood is in supply

mode when turned on. This is indicated on the

display with the supply indicator . To take return

air measurements, press the supply/return button

on the front of the meter. Return air mode will be

indicated on the display with the return indicator

Significant errors may result if:

Instrument is not in proper mode.

Fabric hood is not used with vent open

mode.

Vent Closed/Vent Open Modes

When the instrument is turned on, it is in the vent

closed mode . When the vent closed indicator

is on, the vents must be closed to take the

measurement. Close the vents by loosening the

thumbscrew and sliding the vent baffle to the fully

closed position and locking the vent in place

again.

The vent open mode is indicated with the vent

open indicator on the LCD . Open the vents by

loosening the thumb screw and sliding the vent

baffle to the fully open position and locking it into

place again. Then press and hold the handle

switch for more than 3 seconds to switch the

LoFlo Balometer®Capture Hood to the open vent

mode.

The vent open mode was developed for higher

volume rates on larger diffusers; the 2' x 2' or 650

mm x 650 mm hood should always be used with

vent open mode.

1-Point Measurement Mode

The default mode of the LoFlo Balometer®

Capture Hood is the 1-point measurement mode.

If you are in 2-point measurement mode, simply

turn the instrument off and turn back on.

The 1-point measurement mode is described in

the Getting Started section earlier in this manual.

This is the faster, simpler way to take

measurements.

Use Vent Closed Mode for measurements

between:

10 to 150 cfm (17 to 255 m3/h, 4.7 to 71 l/s).

NOTE: In Vent Closed Mode, volume rates

below 8 cfm (13 m3/h, 3.6 l/s) are displayed as

0; volume rates above 517 cfm (879 m3/hr, 244

l/s) are displayed as Or.

Use Vent Open Mode for measurements between:

150 to 500 cfm (255 to 850 m3/h, 71 to 236 l/s)

NOTE: In Vent Open Mode, volume rates

below 150 cfm (255 m3/h, 71 l/s) are displayed

as Ur; volume rates above 517 cfm (879 m3/h,

244 l/s) are displayed as Or.

2-Point Measurement Mode—Supply

Only

To activate the 2-point measurement mode, turn

the instrument off. While pressing the handle

button, turn the instrument back on. The 2-point

mode indicator will show.

The 2-point measurement mode takes both vent

open and vent closed measurements to calculate

a resistance-compensated volume flow rate.

The process starts with the vents closed and the

display showing the vent closed indicator.

1. Place the LoFlo Balometer®Capture Hood

over the diffuser to be measured and press

the handle switch once to take the vent closed

measurement.

2. The instrument stores that reading.

3. The display will now show the open vent

indicator and you should open the vents.

NOTE: Make certain you are using a fabric

hood when in 2-point mode.

4. Again place the LoFlo Balometer®Capture

Hood over the diffuser to be measured and

press the handle switch to take the vent open

measurement.

5. The instrument calculates and displays the

compensated reading.

6. The numeric display will flash; press the

handle switch again and the instrument will

display the vent closed indicator. Close the

vents.

7. Return to Step 1 to take another resistance

compensated reading.

NOTE: Return to 1- point measurement mode

at any time by turning the power off and on.

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When “–––” is displayed at the last step of the 2-point mode, the calculation for the resistance effect cannot

be made. It can be caused by any of the conditions listed here.

Condition

Reason

The vent closed or vent open measurement is less

than 150 cfm (70 l/s, 255 m3/h).

Calculations are not made at the low end since

the effect is small and can generally be

neglected. Use 1-point mode.

The vent closed or vent open measurement is

greater than 500 cfm (235 l/s, 850 m3/h).

Calculations are not made beyond the calibrated

range.

The vent open measurement minus the vent closed

measurement is too small (< 0).

A mistake has occurred in the process. Repeat

the two-point measurement.

The resistance effect is small and was

overwhelmed by natural fluctuations. Use single-

point mode.

The vent open measurement minus the vent closed

measurement is too large.

A mistake has occurred in the process. The vent

may not have been open for the open vent

measurement. Repeat the two-point

measurement.

The effect is beyond the range of the

compensation equation. Perform a traverse of the

system instead.

NOTE: The display will also show “–––” when the return mode is selected. The 2-point measurement

mode is for supply only.

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SECTION 8

Troubleshooting

Symptom

Possible Cause and Corrective Action

Meter does not turn on.

Battery holder snap connector not connected.

Connect battery holder to instrument.

Batteries may be discharged. Charge or replace

them.

Switch failure, wiring failure, or circuit failure. Call

TSI.

Meter reading lower than expected.

Wrong vent mode chosen. Choose correct vent

mode, open or closed.

Wrong air direction mode chosen. Choose

correct direction, supply or return.

Back pressure effects could be significant. Use 2-

point measurement mode.

Hood frame not sealing properly around diffuser

or grill. Press hood evenly against diffuser.

Odd air flow pattern present. Perform traverse

and use proportional balancing.

Hood torn. Replace, or repair tear with duct tape

or other non-porous material.

Meter out of calibration. Call TSI.

Damage to manifold. Call TSI.

Meter reading higher than expected.

Wrong vent mode chosen. Choose correct vent

mode, open or closed.

Wrong air direction mode chosen. Choose

correct direction, supply or return.

Odd air flow pattern present. Perform traverse

and use proportional balancing.

Meter out of calibration. Call TSI.

Meter not at zero at zero flow.

Instrument not at room temperature. Allow

instrument to acclimate before turning on the

power.

The LoFlo Balometer®Capture Hood is reading

real room air currents. Place on floor with a piece

of cardboard over the top to determine if it is

measuring real air currents.

Meter out of calibration. Call TSI.

Meter displays Er.

Self test failed. Call TSI.

Handle button not working.

Call TSI.

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