Dwyer TBS - Manual (Page 5)

Proper Depth Setting. It is important for accuracy that
the sensor be inserted to the correct depth into the pipe.
1. In Table 1, find Dimension C for your sensor model
and pipe size. Subtract wall thickness of your pipe
(Table 2) to calculate Dimension D.
2. Measuring from the outside of the pipe to the joint
in the housing, as shown in the diagram on the left,
adjust the sensor to Dimension D and hand-tighten
compression nut.
3. Align the conduit housing with the centerline of the
pipe, as shown. Be sure the arrow on the housing
points in the direction of flow.
4. Check Dimension D one more time.
5. Tighten the compression nut fully.
strain
relief
floW
Page 6
InSTallaTIon
Page 7
TABle 2: PIPe WAll ThICkNess
PVC/Steel
Sch. 40
PVC/Steel
Sch. 80
Stainless
Steel (10S)
Stainless
Steel (40S)
Copper Tubing
(Type l)
Copper Tubing
(Type K)
Brass Pipe
Duct. Iron
(Class 52)
noMInal PIPE SIzE
3” 4” 6” 8” 10” 12” 14” 16” 18” 20” 24” 30” 36”
0.216 0.237 0.280 0.322 0.365 0.406 0.438 0.500 0.562 0.593 0.687
0.300 0.337 0.432 0.500 0.593 0.687 0.750 0.843 0.937 1.031 1.218
0.120 0.120 0.134 0.148 0.165 0.180 0.188 0.188 0.188 0.218 0.250 0.312 0.312
0.216 0.237 0.280 0.322 0.365 0.375 0.375 0.375 0.375 0.375 0.375 0.375 0.375
0.090 0.110 0.140 0.200 0.250 0.280
0.109 0.134 0.192 0.271 0.338 0.405
0.219 0.250 0.250 0.312 0.365 0.375
0.280 0.290 0.310 0.330 0.350 0.370 0.390 0.400 0.410 0.420 0.440 0.470 0.530
SET-UP
Connection. Sensors are supplied with 18 ft. of cable.
For sensors with no additional electronics, see diagram for
color coding. For sensors with on-board electronics, see
the manual accompanying the electronics module.
Calibration (“K-factor”). In order to properly process pulses
from the flow sensor, a number must be entered into the control
to which the sensor is connected. This number, called the K-
factor, is the number of pulses the sensor puts out per unit of
fluid passing through the pipe. It is normally provided for Dwyer
sensors in pulses per gallon (see Table 3 below). These numbers
are based on extensive testing, which has shown close agree-
ment between different TBS sensors in the same installation.
Most K-factor error can be attributed to installation variables,
such as depth setting and fitting configuration.
It is possible to field calibrate a sensor by catching the fluid in a
measured container and comparing with the number of pulses
recorded. (To record individual pulses, set the K-factor on the
control to 1.00.) This is especially desirable if the installation
has less than the recommended length of straight pipe up-
stream of the sensor. For detailed intructions on field calibration,
please contact Dwyer Instruments Inc.
RECoRD YoUR SETTInGS
Once you have the meter set up and operational, it
is important to record your meter setttings and save
them for future reference.
K-Factor
Insertion Depth (Dim. D)
noMInal PIPE SIzE
3” 4” 6” 8” 10” 12” 14” 16” 18” 20” 24” 30” 36”
9.16 9.08 8.99 8.82 8.48 8.14 7.80 7.46 6.78 - - - -
14.16 14.08 13.99 13.82 13.48 13.14 12.80 12.46 11.78 10.42 9.40 9.38 -
16.00 15.80 15.70 15.50 15.10 14.80 14.50 13.80 - - - - -
19.95 19.85 19.65 19.45 19.15 18.85 18.45 17.75 16.45 15.45 14.35 - -
TBS-0-S
TBS-0-l
TBS-1-S
TBS-1-l
TABle 1: DImeNsION "C"
nominal Pipe Size
3” 4” 6” 8” 10” 12” 14” 16” 18” 20” 24” 30” 36”
PVC/Steel
Sch. 40
12.067 7.049 2.949 1.690 1.033 0.694 0.575 0.465 0.391 0.326 0.220 - -
PVC/Steel
Sch. 40
13.506 7.917 3.293 1.845 1.150 0.772 0.631 0.498 0.419 0.354 0.419 - -
Stainless Steel
(10S)
10.688 6.160 2.663 1.551 0.944 0.642 0.538 0.439 0.364 0.303 0.199 0.127 0.088
Stainless Steel
(40S)
12.067 7.049 2.949 1.690 1.033 0.687 0.565 0.455 0.377 0.313 0.204 0.128 0.088
Copper Tubing
(Type K)
13.441 7.777 3.317 1.865 1.181 0.781 - - - - - - -
Copper Tubing
(Type l)
13.097 7.564 3.193 1.800 1.133 0.744 - - - - - - -
Copper Pipe
12.115 7.156 2.886 1.682 1.033 0.684 - - - - - - -
Duct Iron
(Class 52)
9.974 6.301 2.734 1.528 0.948 0.635 0.487 0.401 0.330 0.269 0.177 0.114 0.079
TABle 3: TX100/200 k-factors (in Pulses/Gallon) for various pipe sizes