User Manual
14
Table
A-32422
A i r T e m p e r a t u r e / V i s c o s i t y C o r r e c t i o n F a c t o r s f o r S C F M A i r B a s e
T e m p e r a t u r e 7 0
°F 181.7 Micropoise Reference NBS Circular 564
Correction Factor
=
x
µair = 14.58 x
110.4 +
Temp
°F
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
50
60
70
80
90
100
110
120
130
140
150
1.0707
1.0344
1.0000
.9674
.9365
.9072
.8793
.8528
.8276
.8036
.7807
1.0670
1.0308
.9966
.9642
.9335
.9043
.8766
.8503
.8252
.8013
.7785
1.0633
1.0273
.9933
.9611
.9305
.9015
.8739
.8477
.8227
.7990
.7763
1.0596
1.0238
.9900
.9579
.9275
.8987
.8712
.8452
.8203
.7966
.7741
1.0559
1.0204
.9867
.9548
.9246
.8959
.8686
.8426
.8179
.7943
.7719
1.0523
1.0169
.9834
.9517
.9216
.8931
.8659
.8401
.8155
.7920
.7697
1.0487
1.0135
.9802
.9486
.9187
.8903
.8633
.8376
.8131
.7898
.7675
1.0451
1.0101
.9770
.9456
.9158
.8875
.8606
.8351
.8107
.7875
.7653
1.0415
1.0067
.9737
.9425
.9129
.8848
.8580
.8326
.8083
.7852
.7632
1.0379
1.0033
.9705
.9395
.9100
.8820
.8554
.8301
.8060
.7830
.7610
* When flowing gas other than air, use the viscosity in micropoise of the gas at
flowing
temperature in
the Correction Factor
equation.
Table
A-35700
Temperature Correction Factor
Base Temperature =
70°F
Tcf =
Maintenance
Accumulation
of dirt in the capillaries of the
laminar
element will affect the accuracy. When in
doubt, hold
the
laminar in front of a high intensity light, sighting through the capillaries. Any dirt
will be apparent. Loose dirt
can
be blown out with shop air (no more than 100 PSI)
in
reverse direction
of flow. Shop air must be clean
and
dry. Brushing or rubbing the ends of the matrix element is not
recommended because the matrix can be deformed, altering the calibration. Unless the
customer
has the
facilities and primary standards to check
calibra
tion after cleaning, we recommend returning the unit
to
Meriam for cleaning and calibration.