TSI Instruments Alnor Velometer 6000 Series Bedienungsanleitung

A TSI Company

Velometer®

Series 6000

OWNER’S MANUAL

TABLE OF CONTENTS

Using the Velometer Safely 2

General Description 3

Meter 3

Range Selector 4

Pitot Probe 5

Lo-Flow Probe 5

Diffuser Probe 6

Static Pressure Probe 6

Preparation for Use 7

Diffuser Probe 7

Static Pressure Probe 8

Pitot Probe 9

Lo-Flow Probe 9

Operation 10

Procedure for Measuring Velocity with Lo-Flow Probe 10

Velocities at Suction Openings—Except Diffusers

or Grilles 10

At Grinding or Buffing Wheels 10

At Spray Booths 10

Velocities at Plating Tanks 10

Procedure for Measuring Diffuser, Register and Grille

Velocities with Diffuser Probe 11

Typical Diffuser Air Flow Measuring Procedure 11

Procedure for Measuring Static Pressure 13

Procedure for Air Flow Measurement in Ducts 13

Determining Cross-Section Areas 14

Measuring Duct Velocity 14

Troubleshooting and Maintenance 16

Troubleshooting Guide 16

Maintenance 17

General 17

Cleaning of the Velometer 17

Replacement Parts and Accessories 17

Replacement of the Range Selector Filter 17

Replacement of O-Rings in Probes 18

Replacement of O-Rings on the Meter 18

Calibration 18

Service Information 19

Instructions for Return 20

Ownership/Calibration Log 21

WARNING

USING THE VELOMETER SAFELY

All necessary precautions must be observed when operating the Velometer

in the vicinity of moving equipment such as motors and blowers. The user

must exercise care to ensure that the probe or the instrument does not in-

terfere with any moving equipment.

The maximum temperature at which the Velometer can be used is 250°F

(120°C). The maximum pressure difference between the inside of the in-

strument housing and ambient is 4.2 psi. (8.6 gm/cm2). The Velometer is

not designed for gas mixtures other than air.

Any use beyond the operational temperature or pressure limits, or on gas-

ses which are either combustible or may deteriorate materials in the

Velometer, is not recommended and is at the user’s risk.

Opening or otherwise attempting to service your Alnor instrument will void

the warranty. Please read the warranty statement carefully.

WARNING

!CAUTION

GENERAL DESCRIPTION

The Alnor Velometer is a direct reading instrument for measuring air ve-

locities. It is designed to measure velocities inside heating and ventilating

ducts, or in open areas such as at fume hoods, grilles, diffusers, slots on

ventilated plating tanks, and so forth. It may also be used for measuring

duct static pressures.

The Velometer set consists of the meter, velocity and static pressure Range

Selectors, measuring probes and connecting hoses.

The Velometer is basically an air flow meter reading in feet per minute (or

meters per second).

The Velometer is built with a taut band meter movement; it is carefully

balanced so that you may hold the meter in any normal position and still

get an accurate reading. All Velometers are uniformly calibrated to fac-

tory standards: optimum accuracy is attained when velometers are used with

accessories of the same set, and with the meter in the horizontal position

(scale window facing up).

Before using the Velometer, study the operational instructions and proce-

dures to insure proper use of the instrument for accurate results.

Meter

The meter receives air through its sensing ports. A force against the vane

causes a deflection of the needle which yields an indicated reading.

On the face of the meter there is a series of range scales (A) which enables

you to read accurately the measured value. Since there are a number of

ranges, it is important that the scale read on the meter face corresponds to

the velocity or static pressure range that is set on the Range Selector.

On the back side of the meter there are two sensing ports (hose connec-

tions) (B) which are for interconnecting to one of the two Range Selectors

with hoses. One port is marked positive (+) and the other negative (–).

Sensing port caps are provided and you should place them over the sens-

ing ports when the meter is not in use.

Check to see that the pointer is at zero each time the meter is put into service.

The zero adjustment screw (C) enables you to make an adjustment. With

the caps still on the ports, use a screwdriver to bring the pointer to zero. It

should continue to read zero whether the meter is lying flat, standing up-

right or is at any position in between, including the position where one end

of the scale is lower than the other.

ARange

Scales

BSensing

Ports

CZero

Adjustment

Screw

Range Selector

The Range Selector (A) allows you to switch to one of two velocity ranges

or a static pressure range by means of a switch plate (B).

A switch button (C) is provided for changing the Velometer from use with

a Pitot Probe to use with either a Diffuser Probe or a Static Pressure Probe.

When using the Pitot Probe, turn this button and allow it to spring out; when

using either the Diffuser Probe or a Static Pressure Probe, push the button in

and turn to lock it in position. In this position the switch button slot must be

vertical (aligned with arrows on label) for proper instrument operation.

Do not block switch button during operation.

WARNING

!CAUTION

The Range Selector is provided with a plug-in port (D) which accepts the

various probes and allows you to rotate them 360˚. (+) and (–) ports (E)

are provided for hose connections to the meter.

Depending on your model, your set will include one or two Range Selec-

tors that are identified by red or black lettering. This color coding relates

to the same colored scales on the meter.

Take-Up

Adjustment

Screw

Range Selector

BSwitch Plate

CSwitch Button

DPlug-In Port

EPort

Connections

The Range Selector with the black lettering has the following ranges:

Velocity: 0 to 1250 feet per minute

0 to 2500 feet per minute

Static Pressure: 0 to 1 inches of water (6000AP set)

The Range Selector with red lettering has the following ranges:

Velocity: 0 to 5000 feet per minute

0 to 10,000 feet per minute

Static Pressure: 0 to 10 inches of water

A take-up adjustment screw (F) is provided for tightening the switch plate

(B) which may work loose through normal wear. A noticeable effort to

change the setting of the switch plate will indicate proper tightness.

Pitot Probe

The Pitot Probe is designed to measure the velocity of air in ducts and also

in unrestricted areas such as air intakes at grinding/buffing wheels or ven-

tilation slots at plating tanks. For the procedure to measure duct velocities

see pages 13 and 14; for other applications see page 10.

The air intake (and discharge) for the probe is at (A). The probe should be

held at right angles to the air flow; an arrow at the base of the probe (C)

should point in the direction of the air flow.

The probe is marked in one-inch increments (B) for convenience in posi-

tioning the probe inside ducts.

The probe collar (D) acts as a stop when inserting the probe into the Range

Selector; an O-ring acts as a seal when the connecting leg is inserted into

the Range Selector.

Lo-Flow Probe

The Lo-Flow Probe is designed for measuring velocities below 300 feet

per minute in open spaces; it attaches directly to the meter without hoses.

An arrow (A) on the probe serves as a reminder of the direction you must

orient the probe and the meter when taking measurements.

Refer to page 10 for the proper velocity measuring procedure.

AVelocity

Sensing Port

BScale

CAir Flow

Direction

Indicator

DProbe Collar

EConnecting Leg

AAir Flow Direction Indicator

Diffuser Probe

The Diffuser Probe is designed to measure the velocity at diffusers, regis-

ters and grilles. The volume of air being supplied or exhausted can be deter-

minedbymultiplyingthe measuredvelocity timesan airflow factor.*Refer

to page 11 for proper diffuser, register and grille measuring procedures.

Thevelocitysensing port (A)senses thevelocityatthediffuser,register,or grille.

The snap-off fins (B) allow you to accurately position the probe vertically,

horizontally or radially.

The probe collar (C) acts as a stop when connecting the probe to the Range

Selector, and the O-ring acts as a seal.

The connecting leg (D) is inserted into the Range Selector.

* Air flow factors, sometimes known as “K” factors, are generally available from the manu-

facturer of the grille or diffuser.

Static Pressure Probe

The Static Pressure Probe is designed for measuring duct static pressure.

The rubber cap (A) provides a seal around the 1/4" hole (in the duct) where

measurements are to be taken.

The probe collar (B) acts as a stop when connecting the probe to the Range

Selector; the O-ring acts as a seal.

The connecting leg (C) is inserted into the Range Selector.

Refer to page 8 for the proper static pressure measuring procedure.

AVelocity

Sensing

Port

BSnap Off

Fins

CProbe

Collar

DConnecting

Leg

ARubber

Cap

BProbe

Collar

CConnecting

Leg

PREPARATION FOR USE

Diffuser Probe

Step 1: Remove sensing port caps.

Step 2: Connect two hoses (C) to sensing ports (B).

Step 3: Select proper Range Selector (D).

Note: For velocities below 2500 feet per minute, use the Range Se-

lector with black letters; for velocities above 2500 feet per minute,

use the Range Selector with red letters.

Step 4: Connect Range Selector (D) to loose ends of hoses (C) that are

already connected to the meter (A) as follows:

For Supply Measurements

Connect the plus (+) sensing port of the meter to the plus (+) sensing

port of the Range Selector, and the minus (–) sensing port of the meter

to the minus (–) sensing port of the Range Selector.

For Return and Exhaust Measurements

Connect the plus (+) sensing port of the meter to the minus (–) sens-

ing port of the Range Selector, and the minus (–) sensing port of the

meter to the plus (+) sensing port of the Range Selector.

Step 5: Insert Diffuser Probe (E) into the Range Selector (D). Push the

Diffuser Probe firmly down until the collar of the probe rests against the

top of the Range Selector.

Step 6: Check position of switch button (Da) on Range Selector (D). It

must be pushed in and turned to latch it in.

Step 7: Check position of switch plate (Db) on Range Selector (D). It must

be positioned for the proper velocity range.

Step 8: Proceed to make necessary velocity measurements; see page 11

for procedures.

Sensing

Ports

AMeter

CHose

Db Switch

Plate

Da Switch

Button

EDiffuser

Probe

Range

Selector

Static Pressure Probe

Step 1: Remove sensing port caps.

Step 2: Connect two hoses (C) to sensing ports (D).

Step 3: Select proper Range Selector (D).

Note: For 0–1" static pressures, use Range Selector with black let-

ters; for 1–10" static pressures, use Range Selector with red letters.

Step 4: Connect the hoses to the Range Selector (D) as follows:

For Positive Pressure Measurements

Connect the plus (+) sensing port of the meter to the plus (+) sensing

port of the Range Selector. Connect the minus (–) sensing port of

the meter to the minus (–) sensing port of the Range Selector.

For Negative Pressure Measurements

Connect the plus (+) sensing port of the meter to the (–) sensing port

of the Range Selector. Connect the minus (–) sensing port of the meter

to the plus (+) sensing port of the Range Selector.

Step 5: Select the proper Static Pressure Probe (E)

Note: For 0–1" static pressures, use the Static Pressure Probe with

black letters. For 1–10" static pressures, use the Static Pressure

Probe with red letters.

Step 6: Insert the Static Pressure Probe (E) into the Range Selector (D).

Push the probe firmly down until the collar of the probe rests against the

top of the Range Selector.

Step 7: Check position of switch plate (Da) on the Range Selector (D).

It must be pushed in and turned to lock it in position.

Step 8: Check position of switch plate (Db) on the Range Selector (D).

It must be to the extreme left.

Step 9: Proceed to make duct static pressure measurements. See page 13

for proper procedure.

AMeter

CHoses

Db Switch

Plate

Da Switch

Button

EStatic

Pressure

Probe

Range

Selector

Sensing

Ports

Pitot Probe

Step 1: Remove sensing port caps.

Step 2: Connect two hoses (C) to sensing ports (B).

Step 3: Select proper Range Selector (D).

Note: For velocities below 2500 feet per minute, use the Range Se-

lector with black letters; for velocities above 2500 feet per minute,

use the Range Selector with red letters.

Step 4: Connect the hoses to the Range Selector (D) as follows: The plus

(+) sensing port of the meter to the plus (+) sensing port of the Range

Selector and the minus (–) sensing port of the meter to the minus (–) sens-

ing port of the Range Selector.

Step 5: Insert the Pitot Probe (E) into the Range Selector (D). Push the

Pitot Probe firmly down until the collar of the probe rests against the top

of the Range Selector.

Step 6: Check position of switch button (Da) on Range Selector (D). It

must be released and left in the out position.

Step 7: Check position of switch plate (Db) on Range Selector (D). It must

be positioned for the proper velocity range.

Step 8: Proceed to make necessary duct velocity measurements. See page

13 for proper procedures.

Lo-Flow Probe

Step 1: Remove sensing port caps.

Step 2: Connect the Lo-Flow

Probe (F) directly to the meter (A)

by placing it onto the sensing ports

(B); no hoses are required. It fits

only one way onto the meter, with

the arrow pointing to the left when

viewing the meter from the front.

Db Switch

Plate

Da Switch

Button

Range

Selector

CHoses

Meter

Sensing

Ports

EPitot

Probe

Lo-Flow Probe F

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