Meriam Laminar Flow Elements User Manual
Page 15
15
Temp
°F
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
50
60
70
80
90
100
110
120
130
140
150
1.0392
1.0192
1.0000
0.9815
0.9636
0.9464
0.9298
0.9137
0.8982
0.8833
0.8688
1.0372
1.0173
0.9981
0.9797
0.9619
0.9447
0.9282
0.9122
0.8967
0.8818
0.8674
1.0352
1.0153
0.9962
0.9778
0.9601
0.943
0.9265
0.9106
0.8952
0.8803
0.8659
1.0332
1.0134
0.9944
0.976
0.9584
0.9414
0.9249
0.909
0.8937
0.8789
0.8645
1.0311
1.0115
0.9925
0.9742
0.9567
0.9397
0.9233
0.9075
0.8922
0.8774
0.8631
1.0291
1.0095
0.9906
0.9725
0.9549
0.938
0.9217
0.9059
0.8907
0.876
0.8617
1.0271
1.0076
0.9888
0.9707
0.9532
0.9364
0.9201
0.9044
0.8892
0.8745
0.8603
1.0252
1.0057
0.987
0.9689
0.9515
0.9347
0.9185
0.9028
0.8877
0.8731
0.8589
1.0232
1.0038
0.9851
0.9671
0.9498
0.9331
0.9169
0.9013
0.8862
0.8716
0.8575
1.0212
1.0019
0.9833
0.9654
0.9481
0.9314
0.9153
0.8998
0.8847
0.8702
0.8561
Troubleshooting
Problem
Probable Cause
Remedy
Low or High
DP Indication
Insufficient or improperly sized straight pipe
downstream and/or upstream of LFE.
Use 10 diameters of straight pipe
upstream and 5 diameters of straight
pipe downstream of LFE. Pipe size
should be same as LFE outlet size,
e.g. ½" NPT on LFE means 10
diameters of ½” pipe.
One or both differential pressure
connection taps plugged.
Clean or check instrument
connecting line.
If pulsation dampener is used, check stones
(Model 50 MR2 and 50 MC2 only).
If plugged, replace with matched
pair (Meriam part #A-31650).
Leak in line between LFE and readout
device.
Detect and repair.
Large-volume and/or unequal-volume
connecting lines to readout device.
Use small-volume and equal
volume connecting lines to readout
device. See Installation on page 4.
Piping reducers at inlet and/or outlet.
Do not use reducers immediately
before or after LFE.
Pulsating /
Irregular Reading
Irregular flow pattern entering LFE.
Use at least 10 diameters of straight
pipe upstream of LFE.
Leak in system line.
Detect and repair.