Dwyer Instruments 660 Manuel utilisateur

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. Box 373 • Michigan City, IN 46361-0373, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

The Model 660 Air Velocity Monitor is an inexpensive acces-

sory for laboratory fume hoods to indicate the approximate face

velocity of airflow with the primary purpose of warning when a low

flow condition occurs. Red, green and yellow LED’s correspond to

low, normal and high flow rates. When flow decreases from nor-

mal to low an audible alarm will also actuate requiring manual

acknowledgment to silence. Settings for alarms must be individu-

ally adjusted for each fume hood because of the unique conditions

within each one and its surrounding environment. This initial cali-

bration procedure requires use of a suitable anemometer such as

a Model 480 VaneometerTM, Model 471-1 Handheld Thermal

Anemometer or comparable device to measure flow rates through

the fume hood.

OPERATING PRINCIPLE

At the heart of the Model 660 AVM is a small constant tempera-

ture thermistor bead mounted in the center of the sensing tube.

As moving air changes the thermistor output, electronic circuitry

varies the current level to maintain temperature at a factory set

standard condition. By comparing the amount of current neces-

sary to maintain this standard versus normal current, velocity can

be accurately measured and indicated through the LED’s and the

audible alarm.

This unit is typically mounted on the face of one of the fume hood

sidewalls at a convenient viewing height. Flexible tubing is run to

a location, defined in Fig. B, on the interior sidewall of the fume

hood. In operation, the fume hood blower simultaneously draws

air through both the open sash area of the fume hood and the

opening in the 660 AVM. When sufficient change from the “nor-

mal” flow is detected, the lights change accordingly and if a low

flow condition occurs, the audible alarm also sounds.

CAUTION: Do Not Touch the glass enclosed thermistor bead

inside the flow tube. It is very fragile and permanent damage, not

covered by warranty, could result. See maintenance for cleaning

recommendations.

Model 660 Air Velocity Monitor

Specifications - Installation and Operating Instructions

Bulletin H-16

SPECIFICATIONS

Service: Air and non-combustible, non-corrosive gases.

High Setpoint Range: 0-275 FPM (0-1.397 m/s).

Low Setpoint Range: 0-150 FPM (0-.792 m/s).

Repeatability: ±7% of full span, 0-50 and 150-275 FPM;

±5% of full span, 50-150 FPM.

Compensated Temperature Range: 50 to 90°F (32.2°C).

Operating Temperature Range: 32 to 120°F (0 to 48.9°C).

Power Supply: 24 VAC, 3 watts maximum.

Response Time: 6-10 seconds.

Warm-Up Time: 3-5 minutes (no flow).

Audible Alarm: 75 dB between 3-10 feet.

Weight: 3 oz (85 g).

Mounting Hardware: (2) #6 x 1" sheet metal screws, (2) 6-32 x

7/8" machine screws.

INSTALLATION

Tubing, bulkhead fitting and connectors are included with this

device. This kit contains 3 ft of flexible tubing, one tube adapter

with locknut, one 90° elbow adapter and power supply. Assembly

drawing, fig. C, depicts installation using this kit.

1. Choose a clean, dry location with adequate rear space on the

fascia of fume hood side wall, adjacent to the outlet hole location.

See fig. D on reverse for full size mounting hole template. See Fig.

D on reverse for full size mounting hole template. See Fig. B for

outlet hole location.

2. Cut all openings and attach tubing between outlet hole and 660

AVM. As an alternative to flush panel mounting, a single gang

electrical box can be used to surface mount unit by cutting an

opening in the back large enough for tubing clearance. Make sure

tubing is not kinked.

3. Loosen screws on electrical terminal block behind HIGH LED

and insert power supply leads in side openings. Tighten screws,

plug in power supply to outlet. Connect wire leads to 24 VAC

power supply. On initial power application with no airflow, LED’s

will cycle from red-green-yellow-green-red with audible alarm on

red. Alarm can be silenced by pressing ACK. pad.

01-3/32

[27.76]

5/8

[15.88] 3-13/64

[81.36]

1-13/64

[30.56] 7/32

[5.56] 2-3/4

[69.85]

2-53/64

[71.83]

4-1/2

[114.30]

Fig. A

H-16:H-16 7/24/09 10:48 AM Page 1

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DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. Box 373 • Michigan City, IN 46361-0373, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

CALIBRATION

1. Determine the velocity at which the HIGH (yellow) and LOW (red)

LEDs should be actuated. The NORMAL (green) LED will be on

when air flow is between the other two limits.

2. Use a suitable instrument to measure air velocity such as a

Model 480 VaneometerTM or Model 471 Thermal Anemometer.

Take readings at 4-10 different locations within the open face area

to determine average velocity. This procedure will be performed

separately for high and low settings.

3. Allow 3-5 minutes warm-up time with no flow before adjusting

the 660 AVM.

4. HIGH setting. Vary blower speed or adjust sash position until

average velocity is at the upper limit required. Be sure air flow is

not obstructed. Turn HSP screw clockwise until LED’s change

from green to yellow.

5. LOW setting. Adjust flow until average velocity is at the lower

limit required. Turn LSP screw counter-clockwise until LED’s

change from green to red. Audible alarm will sound simultaneous-

ly. Press ACK. pad to silence.

6. Repeat adjustment of air velocity to HIGH and LOW flow rates

to confirm proper operation. Make further adjustments to 660

AVM settings if necessary.

7. To confirm proper operation of all alarms, press TEST pad.

MAINTENANCE

No routine maintenance is required for the 660 AVM. Use extreme

caution when cleaning the thermistor bead. The thin glass rod in

which it is housed is very fragile. Use only a soft camel hair brush

to gently remove accumulated dust. After cleaning or replacement

of fume hood filters or other fume hood service, it is recommend-

ed that you check AVM calibration following the procedure above.

The Model 660 Air Velocity Monitor is not field serviceable and

should be returned if repair is needed (field repair should not be

attempted and may void warranty). Be sure to include a brief

description of the problem plus any relevant application notes.

Contact customer service to receive a return goods authorization

number before shipping.

AIR VELOCITY

MONITOR

TUBING

SIDE WALL

SASH TRACK

SASH

OUTLET

HOLE

CENTER OF HOLE 4˝ (101)

BELOW BOTTOM OF

FULL OPEN SASH

4-10˝

(101 - 254)

600 AVM FUME HOOD WALL

(Ø1.315˝)

TUBING

LOCKNUT TUBE ADAPTER

OPTIONAL 90°C

ELBOW ADAPTER

3.275

[83.2]

.187

[4.76]

4.5 REF.

[114.3]

DRILL TO 5/64 (2) FOR

PANEL MOUNTING

USE #6 SHEET

METAL SCREWS

DRILL TO 5/32 (4) FOR

JUNCTION BOX

MOUNTING USE 6-32

MACHINE SCREWS

2.125 X 2.938 (54 X 74.5)

CUTOUT FOR PANEL

MOUNTING

2.75 REF.

[70]

Fig. B

Fig. C

Fig. D

H-16:H-16 7/24/09 10:48 AM Page 2

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