Dwyer instruments, inc – Dwyer FLST User Manual

Page 4

Printed in U.S.A.1/09

FR# R1-443414-00 A Rev. 1

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000

www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.

Fax: 219/872-9057

e-mail: [email protected]

0.0020
0.0023
0.0025
0.0027
0.0030
0.0033
0.0036
0.0039
0.0042
0.0045
0.0049
0.0052
0.0056
0.0060
0.0064
0.0068
0.0072
0.0076
0.0081
0.0085
0.0090
0.0095
0.0100
0.0105
0.0110
0.0115
0.0121
0.0126
0.0132
0.0138
0.0144
0.0150
0.0156
0.0162
0.0169
0.0175
0.0182
0.0189
0.0196
0.0203
0.0210
0.0217
0.0224
0.0232

180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
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610

620
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800
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870
880
890
900
910
920
930
940
950
960
970
980
990
1000
1010
1020
1030
1040
1050

0.0240
0.0247
0.0255
0.0263
0.0272
0.0280
0.0288
0.0297
0.0305
0.0314
0.0323
0.0332
0.0341
0.0351
0.0360
0.0370
0.0379
0.0389
0.0399
0.0499
0.0419
0.0429
0.0440
0.0450
0.0461
0.0472
0.0483
0.0494
0.0505
0.0516
0.0528
0.0539
0.0551
0.0563
0.0575
0.0587
0.0599
0.0611
0.0623
0.0636
0.0649
0.0661
0.0674
0.0687

1060
1070
1080
1090
1100
1110
1120
1130
1140
1150
1160
1170
1180
1190
1200
1210
1220
1230
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1250
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1280
1290
1300
1310
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1340
1350
1360
1370
1380
1390
1400
1410
1420
1430
1440
1450
1460
1470
1480
1490

0.0701
0.0714
0.0727
0.0741
0.0754
0.0768
0.0782
0.0796
0.0810
0.0825
0.0839
0.0853
0.0868
0.0883
0.0898
0.0913
0.0928
0.0943
0.0959
0.0974
0.0990
0.1006
0.1021
0.1037
0.1054
0.1070
0.1086
0.1103
0.1119
0.1136
0.1153
0.1170
0.1187
0.1205
0.1222
0.1239
0.1257
0.1275
0.1293
0.1311
0.1329
0.1347
0.1366
0.1384

1500
1510
1520
1530
1540
1550
1560
1570
1580
1590
1600
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1780
1790
1800
1810
1820
1830
1840
1850
1860
1870
1880
1890
1900
1910
1920
1930

0.1403
0.1422
0.1440
0.1459
0.1479
0.1498
0.1517
0.1537
0.1556
0.1576
0.1596
0.1616
0.1636
0.1656
0.1677
0.1697
0.1718
0.1739
0.1760
0.1781
0.1802
0.1823
0.1844
0.1866
0.1888
0.1909
0.1931
0.1953
0.1975
0.1998
0.2020
0.2040
0.2065
0.2088
0.2111
0.2134
0.2157
0.2180
0.2203
0.2227
0.2251
0.2274
0.2298
0.2322

1940
1950
1960
1970
1980
1990
2000
2020
2040
2060
2080
2100
2120
2140
2160
2180
2200
2220
2240
2260
2280
2300
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2380
2400
2420
2440
2460
2480
2500
2520
2540
2560
2580
2600
2620
2640
2660
2680
2700
2720
2740

0.2346
0.2371
0.2395
0.2420
0.2444
0.2469
0.2494
0.2544
0.2595
0.2646
0.2697
0.2749
0.2802
0.2855
0.2909
0.2963
0.3017
0.3073
0.3128
0.3184
0.3241
0.3298
0.3356
0.3414
0.3472
0.3531
0.3591
0.3651
0.3712
0.3773
0.3834
0.3897
0.3959
0.4022
0.4086
0.4150
0.4214
0.4280
0.4345
0.4411
0.4478
0.4545
0.4612
0.4681

2760
2780
2800
2820
2840
2860
2880
2900
2920
2940
2960
2980
3000
3020
3040
3060
3080
3100
3120
3140
3160
3180
3200
3220
3240
3260
3280
3300
3320
3340
3360
3380
3400
3420
3440
3460
3480
3500
3520
3540
3560
3580
3600
3620

0.4749
0.4818
0.4888
0.4958
0.5028
0.5099
0.5171
0.5243
0.5316
0.5389
0.5462
0.5536
0.5611
0.5686
0.5762
0.5838
0.5914
0.5991
0.6069
0.6147
0.6225
0.6304
0.6384
0.6464
0.6545
0.6626
0.6707
0.6789
0.6872
0.6955
0.7038
0.7122
0.7207
0.7292
0.7378
0.7464
0.7550
0.7637
0.7725
0.7813
0.7901
0.7990
0.8080
0.8170

3640
3660
3680
3700
3720
3740
3760
3780
3800
3820
3840
3860
3880
3900
3920
3940
3960
3980
4000
4050
4100
4150
4200
4250
4300
4350
4400
4450
4500
4550
4600
4650
4700
4750
4800
4850
4900
4950
5000
5050
5100
5150
5200
5250

0.8260
0.8351
0.8443
0.8535
0.8627
0.8720
0.8814
0.8908
0.9002
0.9097
0.9193
0.9289
0.9386
0.9483
0.9580
0.9678
0.9777
0.9876
0.9975
1.0226
1.0480
1.0737
1.0997
1.1261
1.1527
1.1797
1.2070
1.2346
1.2625
1.2907
1.3192
1.3480
1.3772
1.4066
1.4364
1.4665
1.4969
1.5276
1.5586
1.5899
1.6216
1.6535
1.6858
1.7184

5300
5350
5400
5450
5500
5550
5600
5650
5700
5750
5800
5850
5900
5950
6000
6050
6100
6150
6200
6250
6300
6350
6400
6450
6500
6550
6600
6650
6700
6750
6800
6850
6900
7000
7100
7200
7300
7400
7500
7600
7700
7800
7900
8000

1.7512
1.7844
1.8180
1.8518
1.8859
1.9204
1.9551
1.9902
2.0256
2.0613
2.0973
2.1336
2.1702
2.2071
2.2444
2.2819
2.3198
2.3580
2.3965
2.4353
2.4744
2.5139
2.5536
2.5937
2.6340
2.6747
2.7157
2.7570
2.7986
2.8406
2.8828
2.9253
2.9682
3.0549
3.1428
3.2319
3.3223
3.4140
3.5069
3.6010
3.6964
3.7930
3.8909
3.9900

Engineering Reference Table

MAINTENANCE
Since the sensing elements have no moving parts, only periodic cleaning
may be required. The sensing elements should be inspected for fouling of
the sensing holes as part of an annual preventative maintenance program.
Installations having viscous airborne particles may require more frequent
inspection. If the sensing holes on the elements have become fouled or
plugged, the following procedure is recommended. Caution, all instru-
ments must be isolated (removed) from the sensing lines prior to
performing the following cleaning procedure.

Backpurging: Connect clean/dry compressed air, set at a maximum
pressure of 25 psi, to the output pressure ports (total and/or static) of the
sensing element being cleaned. While purging the sensing element, wipe
the surface of the cylinder with a cloth or brush to loosen and remove all
contaminate buildup.

Velocity Versus Velocity Pressure

V = Velocity in feet per minute Pv = Velocity Pressure in inches H

Above Pv Values are Based on Standard Air Density of 0.075 lbm ft

which is Air at 68°F. 50% Relative Humidity, and 29.92˝ Hg.

The equation for converting air volume (Q) into velocity (V) and velocity pressure (Pv) is:

V = Q

PV = V

x p

[

Where
V = Velocity in fpm

C = 1096.7

Q = Flow in efm

p = Density of air in lb/ft

A = Area in ft

Pv = Velocity pressure in inches H

Cleaning: In applications where the sensing elements are subject
to viscous contaminants it is recommended that the surface be
washed with a cleaning agent. The cleaning agent used must be
suitable for use on the type of material the sensing element is con-
structed of (i.e. aluminum, stainless steel, etc.)
The Series FLST Duct Mounted Airflow Measurement Station 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.

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