Geokon 4675LV User manual

Instruction Manual
Model 4675LV
Weir Monitor
No part of this instruction manual may be reproduced, by any means, without the written consent of Geokon, Inc.
The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes no responsibility for
errors, omissions, or misinterpretation. The information herein is subject to change without notification.
Copyright © 1991-2017 by Geokon, Inc.
(Doc Rev J, 10/23/17)

Warranty Statement
Geokon, Inc. warrants its products to be free of defects in materials and workmanship, under
normal use and service for a period of 13 months from date of purchase. If the unit should
malfunction, it must be returned to the factory for evaluation, freight prepaid. Upon examination
by Geokon, if the unit is found to be defective, it will be repaired or replaced at no charge.
However, the WARRANTY is VOID if the unit shows evidence of having been tampered with
or shows evidence of being damaged as a result of excessive corrosion or current, heat, moisture
or vibration, improper specification, misapplication, misuse or other operating conditions outside
of Geokon's control. Components which wear or which are damaged by misuse are not
warranted. This includes fuses and batteries.
Geokon manufactures scientific instruments whose misuse is potentially dangerous. The
instruments are intended to be installed and used only by qualified personnel. There are no
warranties except as stated herein. There are no other warranties, expressed or implied, including
but not limited to the implied warranties of merchantability and of fitness for a particular
purpose. Geokon, Inc. is not responsible for any damages or losses caused to other equipment,
whether direct, indirect, incidental, special or consequential which the purchaser may experience
as a result of the installation or use of the product. The buyer's sole remedy for any breach of this
agreement by Geokon, Inc. or any breach of any warranty by Geokon, Inc. shall not exceed the
purchase price paid by the purchaser to Geokon, Inc. for the unit or units, or equipment directly
affected by such breach. Under no circumstances will Geokon reimburse the claimant for loss
incurred in removing and/or reinstalling equipment.
Every precaution for accuracy has been taken in the preparation of manuals and/or software,
however, Geokon, Inc. neither assumes responsibility for any omissions or errors that may
appear nor assumes liability for any damages or losses that result from the use of the products in
accordance with the information contained in the manual or software.

TABLE of CONTENTS
1. INTRODUCTION .................................................................................................................................................. 1
2. INSTALLATION PROCEDURES ....................................................................................................................... 1
2.1PRELIMINARY CHECKS........................................................................................................................................ 1
2.2 INSTALLATION .................................................................................................................................................... 1
3. TAKING READINGS............................................................................................................................................ 3
3.1 GK-404 READOUT BOX...................................................................................................................................... 3
3.1.1 Operating the GK-404................................................................................................................................ 3
3.2 GK-405 READOUT BOX...................................................................................................................................... 4
3.2.1 Connecting Sensors.................................................................................................................................... 4
3.2.2 Operating the GK-405................................................................................................................................ 4
3.3GK-403 READOUT BOX (OBSOLETE MODEL)..................................................................................................... 5
3.3.1 Connecting Sensors to the GK-403 ............................................................................................................ 5
3.3.2 Operating the GK-403................................................................................................................................ 5
3.4MEASURING TEMPERATURES.............................................................................................................................. 5
4. DATA REDUCTION.............................................................................................................................................. 6
4.1 DETERMINATION OF WATER ELEVATION............................................................................................................ 6
4.2 CORRECTIONS FOR TEMPERATURE CHANGES ..................................................................................................... 8
4.3 DENSITY AND COMPRESSIBILITY ........................................................................................................................ 8
5. MAINTENANCE.................................................................................................................................................... 9
5.1 MOISTURE TRAP ................................................................................................................................................. 9
5.2 WEIGHT MAINTENANCE...................................................................................................................................... 9
5.3 SENSOR............................................................................................................................................................... 9
6. TROUBLE SHOOTING........................................................................................................................................ 9
APPENDIX A. SPECIFICATIONS.........................................................................................................................10
APPENDIX B. THERMISTOR TEMPERATURE DERIVATION.....................................................................11
APPENDIX C. SWAGELOK TUBE FITTING INSTRUCTIONS ......................................................................12
C.1 INSTALLATION...................................................................................................................................................12
C.2 REASSEMBLY INSTRUCTIONS ............................................................................................................................13
FIGURES, TABLES AND EQUATIONS
FIGURE 1-STILLING WELL SUPPORTS .......................................................................................................................... 2
FIGURE 2-LEMO CONNECTOR TO GK-404 ................................................................................................................... 3
FIGURE 3-LIVE READINGS –RAW READINGS............................................................................................................... 4
FIGURE 4-TYPICAL CALIBRATION SHEET..................................................................................................................... 7
FIGURE 5-DENSITY OF WATER AS A FUNCTION OF TEMPERATURE AND PRESSURE INTENSITY ...................................... 8
FIGURE 6-TUBE INSERTION.........................................................................................................................................12
FIGURE 7-MAKE A MARK AT SIX O’CLOCK ................................................................................................................12
FIGURE 8-TIGHTEN ONE AND ONE-QUARTER TURNS .................................................................................................12
FIGURE 9-MARKS FOR REASSEMBLY ..........................................................................................................................13
FIGURE 10 -FERRULES SEATED AGAINST FITTING BODY.............................................................................................13
FIGURE 11 -TIGHTEN NUT SLIGHTLY...........................................................................................................................13
TABLE 1-THERMISTOR RESISTANCE VERSUS TEMPERATURE......................................................................................11
EQUATION 1-CHANGE IN WATER HEIGHT.................................................................................................................... 6
EQUATION 2-CORRECTION FOR TEMPERATURE/DENSITY CHANGES............................................................................ 8
EQUATION 3-RESISTANCE TO TEMPERATURE .............................................................................................................11

1
1. INTRODUCTION
The Geokon Model 4675LV Weir Monitor is designed for the measurement of water levels in
streams, weirs, flumes, etc., where accurate measurements of very small water level changes are
required. The unit consists of a vibrating wire from which is suspended a hanging cylindrical
weight partially submerged in the water. As the water level rises and falls, the buoyancy forces
acting on the weight change causing changes in the tension and vibrational frequency in the
vibrating wire. Level changes of as little as .001 inches can be measured. Ranges of up to 10 feet
are available.
2. INSTALLATION PROCEDURES
2.1 Preliminary Checks
Before installing the weight cylinder, remove the orange colored spacer that lies between
the base of the sensor and the nut on the hook assembly.(This releases the tension in the
sensor wire –put there as a safety precaution to protect the sensor from damage during shipment.)
The gage and weight assembly can now be checked out on site by connecting the sensor to the
readout system and measuring the output of the sensor with the weight hanging from it in air.
The readings should coincide within about 200 digits of the factory reading in air shown on the
calibration sheet. (See Section 3 for readout instructions. Be sure that the sensor is held firmly
and the system is allowed to stabilize (no swinging of the weight). Detach the weight after this
preliminary check. Always handle with great care to prevent breakage.
2.2 Installation
If the 4675LV is used in a weir box, a Stilling Well is required. The Stilling Well is provided by
Geokon, in the form of a slotted, three or four inch PVC pipe. This Stilling Well must be
installed in a vertically plumb position, in an area where there is little turbulence, and
positioned in such a way that the bottom of the weight is slightly lower than the tip of the V
notch.It is important that the well be vertical, because any friction from the weight rubbing
along the well will influence the sensor output
The installation is made by using two pipe straps to hold the stilling well in place. Two spacer
bars are provided to hold the stilling well away from the wall so that the stilling well cap can be
removed and replaced as necessary. For concrete weir boxes, four Rawl plugs are provided.
Mark out the position for four bolt holes, (see Figure 1), and drill a 1/2 inch (12 mm) diameter
hole two inches (50 mm) deep at each location. (The spacer bar can be used to help locate the
hole spacing properly). A 3/8 Rawl plug (four provided) is installed in each hole, using the
installation tool provided. The Rawl plug is first placed in the hole and tapped flush with the
surface. Then place the installation tool inside the Rawl plug and set the anchor by means of
several sharp hammer blows.
The PVC slotted tubing has a bottom plug at its lower end, which can now be cemented in place
using PVC cement. (It is left loose in case the PVC pipe needs to be shortened a little due to
space limitations). Use the four 3/8-16 bolts provided to bolt the stilling well to the wall of the
weir box using the pipe strap and spacer bars.

2
Figure 1 - Stilling Well Supports
Check that the sensor is reading then push it inside the Swagelok fitting in the pipe cap and
tighten the According to the instructions in Appendix C. Leave about one inch of the sensor
protruding from the Swagelok. Carefully attach the weight to the eyebolt on the base of the
sensor and lower the assembly into the stilling well until the pipe cap sits firmly on top of the
pipe.
The yellow vented readout cable can now be extended to a local readout location where an
optional terminal box can be used to enclose the end of the yellow vented cable, as well as the
vent line moisture trap. If the readout location is remote from the weir location then a blue
unvented cable can be used between the terminal box containing the moisture trap and the
readout location. The seal screw on the bottom of the desiccant chamber must be kept open
while the Weir Monitor is in operation. The proper color for the desiccant is blue. If the color
is pink then fresh desiccant is required.

3
3. TAKING READINGS
3.1 GK-404 Readout Box
The Model GK-404 Vibrating Wire Readout is a portable, low-power, handheld unit that is
capable of running for more than 20 hours continuously on two AA batteries. It is designed for
the readout of all Geokon vibrating wire gages and transducers, and is capable of displaying the
reading in either digits, frequency (Hz), period (µs), or microstrain (µε). The GK-404 also
displays the temperature of the transducer (embedded thermistor) with a resolution of 0.1 °C.
3.1.1 Operating the GK-404
Before use, attach the flying leads to the GK-404 by aligning the red circle on the silver
“Lemo” connector of the flying leads with the red line on the top of the GK-404 (Figure
2). Insert the Lemo connector into the GK-404 until it locks into place.
Figure 2 - Lemo Connector to GK-404
Connect each of the clips on the leads to the matching colors of the sensor conductors,
with blue representing the shield (bare).
To turn the GK-404 on, press the “ON/OFF” button on the front panel of the unit. The
initial startup screen will be displayed. After approximately one second, the GK-404 will
start taking readings and display them based on the settings of the POS and MODE
buttons.
The unit display (from left to right) of the GK-404 is as follows:
•The current Position: Set by the POS button, displayed as a letter A through F.
•The current Reading: Set by the MODE button, displayed as a numeric value
followed by the unit of measure.
•Temperature reading of the attached gage in degrees Celsius.
Use the POS button to select position Band the MODE button to select Dg (digits).
(Other functions can be selected as described in the GK-404 Manual.)
The GK-404 will continue to take measurements and display readings until the unit is
turned off, either manually, or if enabled, by the Auto-Off timer. For further details
information the GK-404 manual.

4
3.2 GK-405 Readout Box
The GK-405 Vibrating Wire Readout is made up of two components: The Readout Unit,
consisting of a Windows Mobile handheld PC running the GK-405 Vibrating Wire Readout
Application; and the GK-405 Remote Module, which is housed in a weatherproof enclosure and
connects via a cable to the vibrating wire gage to be measured. The two components
communicate wirelessly using Bluetooth®, a reliable digital communications protocol. The
Readout Unit can operate from the cradle of the Remote Module, or, if more convenient, can be
removed and operated up to 20 meters from the Remote Module.
3.2.1 Connecting Sensors
Sensors with 10-pin Bulkhead Connectors Attached:
Align the grooves on the sensor connector (male), with the appropriate connector on the
readout (female connector labeled senor or load cell). Push the connector into place, and
then twist the outer ring of the male connector until it locks into place.
Sensors with Bare Leads:
Attach the GK-403-2 flying leads to the bare leads of a Geokon vibrating wire sensor by
connecting each of the clips on the leads to the matching colors of the sensor conductors,
with blue representing the shield (bare).
3.2.2 Operating the GK-405
Press the button labeled “POWER ON (BLUETOOTH)”. A blue light will begin
blinking, signifying that the Remote Module is waiting to connect to the handheld unit.
Launch the GK-405 VWRA program by tapping on “Start” from the handheld PC’s main
window, then “Programs” then the GK-405 VWRA icon. After a few seconds, the blue
light on the Remote Module should stop flashing and remain lit. The Live Readings
Window will be displayed on the handheld PC. Choose display mode “B”.
Figure 3 shows a typical vibrating wire output in digits and thermistor output in degrees
Celsius.
Figure 3 - Live Readings – Raw Readings
For further information, consult the GK-405 Instruction Manual.

5
3.3 GK-403 Readout Box (Obsolete Model)
The GK-403 can store gage readings and apply calibration factors to convert readings to
engineering units. The following instructions explain taking gage measurements using Mode "B"
(similar to the GK-401 switch positions "B").
3.3.1 Connecting Sensors to the GK-403
Connecting Sensors with 10-pin Bulkhead Connectors Attached:
Align the grooves on the sensor connector (male), with the appropriate connector on the
readout (female connector labeled senor or load cell). Push the connector into place, and
then twist the outer ring of the male connector until it locks into place.
Connecting Sensors with Bare Leads:
Attach the GK-403-2 flying leads to the bare leads of a Geokon vibrating wire sensor by
connecting each of the clips on the leads to the matching colors of the sensor conductors,
with blue representing the shield (bare).
3.3.2 Operating the GK-403
1) Turn the display selector to position "B".
2) Turn the unit on.
3) The readout will display the vibrating wire output in digits. The last digit may change
one or two digits while reading.
4) The thermistor reading will be displayed above the gage reading in degrees
centigrade.
5) Press the "Store" button to record the value displayed.
The unit will automatically turn off after approximately two minutes to conserve power.
Consult the GK-403 Instruction Manual for additional information.
3.4 Measuring Temperatures
All liquid level sensors are equipped with a thermistor that gives a varying resistance output as
the temperature changes. The white and green leads of the instrument cable are normally
connected to the internal thermistor.
The GK-403, GK-404, and GK-405 readout boxes will read the thermistor and display the
temperature in degrees C.
To read temperatures using an ohmmeter:
1) Connect an ohmmeter to the green and white thermistor leads coming from the strain gage.
(Since the resistance changes with temperature are large, the effect of cable resistance is
usually insignificant. For long cables a correction can be applied, equal to 14.7 ohms per
one thousand feet. Multiply this factor by two to account for both directions.)
2) Look up the temperature for the measured resistance in Appendix B, Table 1.

6
4. DATA REDUCTION
4.1 Determination of Water Elevation
Each type of weir, depending on its type, shape, and size has an equation relating the volume of
fluid passing over it to the height of water, H, passing over the weir.
The change in height of the water is directly proportioned to the change in output of the
transducer. The following formula applies for the determination of the change in water height:
ΔH = (R1– R0) G
Equation 1 - Change in Water Height
Where;
His the height of water above the tip of the weir.
R0is the initial reading.
R1is the subsequent reading.
Gis the calibration factor in the height units /digit shown on the calibration sheet. (See Figure 4
for an example of a typical calibration sheet.)
At the time that the initial reading (R0) is taken, it is necessary to measure accurately as possible
the difference in elevation between the surface of the water in the weir box and the tip of the
weir. If the weir plate is graduated, simply record the initial water level as indicated, call this
difference in elevation ΔE.
Then;
H = (R1– R0) G + ΔEinches or mm
Alternatively, from the initial reading (RI) taken when the measured water height is ΔEinches, it
is possible, using the gage factor (G), to calculate the reading equivalent to the water level at the
tip of the V notch (Ro).
For instance:
If;
RI= 6500
ΔE= 5.2 inches
G= - 0.001981 inches
Then;
Ro= 6500 + 5.2/0.001981= 9125 and H = G(RI -9125)
Another method, if possible, is to adjust the height of water so that water just trickles over the V
notch tip, and then take the Roreading.

7
Figure 4 - Typical Calibration Sheet

8
4.2 Corrections for Temperature Changes
The vibrating wire sensor itself is insensitive to temperature changes within the normal operating
range. The system, however, is not entirely unaffected by changes in water temperature which
influence the density and therefore, the buoyancy of the fluid. The influence is relatively minor
and can be accounted for to some degree by measuring the water temperature and making
density corrections. Alternatively, two sensors can be used, one of which is completely
submerged at all times, and whose output can be used to make corrections for the other sensor.
This technique is not fool proof either, since the water may have temperature gradients that the
submerged sensor may or may not intersect. A temperature/density curve for water is shown in
Figure 5. As can be seen from the data the density of the water changes very little in the normal
operating range of the sensor. The following equation is used to correct for temperature/density
changes:
∆H = (R0) G /(1-0.0002T0) - (R1) G /(1- 0.0002T1)
Equation 2 - Correction for Temperature/Density Changes
Where;
His the height of water above the tip of the weir.
R0is the initial reading.
R1is the subsequent reading.
T0is the initial water temperature in °C
T1is the current water temperature in °C
Gis the calibration factor in the height units /digit shown on the calibration sheet. (See Figure 4
for an example of a typical calibration sheet.)
4.3 Density and Compressibility
Density is defined as the mass per unit volume, and it depends upon the temperature and pressure
intensity. The density of pure water is given in Figure 5 below.
Figure 5 - Density of water as a function of temperature and pressure intensity
(Figure 5 used with permission from Fluid Mechanics for Hydraulic Engineers, by Hunter
Rouse, copyright 1938, McGraw-Hill Book Company, Inc.)

9
5. MAINTENANCE
5.1 Moisture Trap
The vibrating wire sensor has a vent tube to prevent loading on the sensor due to changes in
atmosphere pressure, and the moisture trap on the vent line requires periodic changing of the
desiccant capsules. The frequency of this is dependent on weather conditions, but three to six
months is a normal period. The seal screw on the moisture trap must be left open when the weir
monitor is in operation.
5.2 Weight Maintenance
Since the weight is assumed to be of constant mass, it is important that it be kept clean and free
of encrustation, algal growth, etc. Periodic observation should be made and this can coincide
with the moisture trap maintenance.
5.3 Sensor
Maintenance of the sensor itself is confined to periodic checks of cable connections and
maintenance of terminals. The transducers themselves cannot be opened for inspection.
6. TROUBLE SHOOTING
Should difficulties arise, consult the following list of problems and possible solutions. For
additional troubleshooting and support, contact Geokon.
Symptom: Thermistor resistance is too high
Likely, there is an open circuit. Check all connections, terminals, and plugs. If a cut is
located in the cable, splice according to recommended procedures.
Symptom: Thermistor resistance is too low
A short is likely. Check all connections, terminals, and plugs. If a short is located in the
cable, splice according to recommended procedures.
Water may have penetrated the interior of the transducer. There is no remedial action.
Symptom: Transducer reading unstable
Make sure the shield drain wire is connected to the blue clip on the flying leads. (Green for
the GK-401.)
Isolate the readout from the ground by placing it on a piece of wood or other insulator.
Check for sources of nearby electrical noise such as motors, generators, antennas, or
electrical cables. Move the transducer cable away from these sources if possible. Contact the
factory for available filtering and shielding equipment.

10
APPENDIX A. SPECIFICATIONS
Model No.
4675LV
Standard Ranges1
150, 300, 600, 1500 mm
Accuracy2
±0.1% F.S.
Temperature Range3
-30 to +80 °C
Frequency Range
1400-3500 Hz
Materials:
Sensor and Weight: Stainless steel
Sitting Well: PVC standard, stainless steel (optional)
Cable
Four Conductor, 22 gage PVC jacket
Sensor
Diameter: 1.00”
Length: 8.5”
1 Other ranges available on request
2 Accuracy achieved by using a polynomial expression rather than a linear coefficient
3 Using antifreeze solution can extend the range below 0 °C. The system requires calibration with
the solution being used.

11
APPENDIX B. THERMISTOR TEMPERATURE DERIVATION
Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3
Resistance to Temperature Equation:
T= 1
A+B(LnR)+C(LnR)3-273.2
Equation 3 - Resistance to Temperature
Where;
T=Temperature in °C.
LnR =Natural Log of Thermistor Resistance
A=1.4051 ×10-3
B=2.369 ×10-4
C=1.019 ×10-7
Note: Coefficients calculated over the −50 to +150 °C. span.
Ohms
Temp
Ohms
Temp
Ohms
Temp
Ohms
Temp
Ohms
Temp
201.1K
-50
16.60K
-10
2417
+30
525.4
+70
153.2
+110
187.3K
-49
15.72K
-9
2317
31
507.8
71
149.0
111
174.5K
-48
14.90K
-8
2221
32
490.9
72
145.0
112
162.7K
-47
14.12K
-7
2130
33
474.7
73
141.1
113
151.7K
-46
13.39K
-6
2042
34
459.0
74
137.2
114
141.6K
-45
12.70K
-5
1959
35
444.0
75
133.6
115
132.2K
-44
12.05K
-4
1880
36
429.5
76
130.0
116
123.5K
-43
11.44K
-3
1805
37
415.6
77
126.5
117
115.4K
-42
10.86K
-2
1733
38
402.2
78
123.2
118
107.9K
-41
10.31K
-1
1664
39
389.3
79
119.9
119
101.0K
-40
9796
0
1598
40
376.9
80
116.8
120
94.48K
-39
9310
+1
1535
41
364.9
81
113.8
121
88.46K
-38
8851
2
1475
42
353.4
82
110.8
122
82.87K
-37
8417
3
1418
43
342.2
83
107.9
123
77.66K
-36
8006
4
1363
44
331.5
84
105.2
124
72.81K
-35
7618
5
1310
45
321.2
85
102.5
125
68.30K
-34
7252
6
1260
46
311.3
86
99.9
126
64.09K
-33
6905
7
1212
47
301.7
87
97.3
127
60.17K
-32
6576
8
1167
48
292.4
88
94.9
128
56.51K
-31
6265
9
1123
49
283.5
89
92.5
129
53.10K
-30
5971
10
1081
50
274.9
90
90.2
130
49.91K
-29
5692
11
1040
51
266.6
91
87.9
131
46.94K
-28
5427
12
1002
52
258.6
92
85.7
132
44.16K
-27
5177
13
965.0
53
250.9
93
83.6
133
41.56K
-26
4939
14
929.6
54
243.4
94
81.6
134
39.13K
-25
4714
15
895.8
55
236.2
95
79.6
135
36.86K
-24
4500
16
863.3
56
229.3
96
77.6
136
34.73K
-23
4297
17
832.2
57
222.6
97
75.8
137
32.74K
-22
4105
18
802.3
58
216.1
98
73.9
138
30.87K
-21
3922
19
773.7
59
209.8
99
72.2
139
29.13K
-20
3748
20
746.3
60
203.8
100
70.4
140
27.49K
-19
3583
21
719.9
61
197.9
101
68.8
141
25.95K
-18
3426
22
694.7
62
192.2
102
67.1
142
24.51K
-17
3277
23
670.4
63
186.8
103
65.5
143
23.16K
-16
3135
24
647.1
64
181.5
104
64.0
144
21.89K
-15
3000
25
624.7
65
176.4
105
62.5
145
20.70K
-14
2872
26
603.3
66
171.4
106
61.1
146
19.58K
-13
2750
27
582.6
67
166.7
107
59.6
147
18.52K
-12
2633
28
562.8
68
162.0
108
58.3
148
17.53K
-11
2523
29
543.7
69
157.6
109
56.8
149
Table 1 - Thermistor Resistance versus Temperature
55.6
150

12
APPENDIX C. SWAGELOK TUBE FITTING INSTRUCTIONS
These instructions apply to one inch (25 mm) and smaller fittings.
C.1 Installation
1) Fully insert the tube into the fitting until it bumps against the shoulder.
Figure 6 - Tube Insertion
2) Rotate the nut until it is finger-tight. (For high-pressure applications as well as high-safety-
factor systems, further tighten the nut until the tube will not turn by hand or move axially in
the fitting.)
3) Mark the nut at the six o’clock position.
Figure 7 - Make a Mark at Six O’clock
4) While holding the fitting body steady, tighten the nut one and one-quarter turns until the
mark is at the nine o’clock position. (Note: For 1/16”, 1/8”, 3/16”, and 2, 3, and 4 mm
fittings, tighten the nut three-quarters of a turn until the mark is at the three o’clock position.)
Figure 8 - Tighten One and One-Quarter Turns

13
C.2 Reassembly Instructions
Swagelok tube fittings may be disassembled and reassembled many times.
Warning! Always depressurize the system before disassembling a Swagelok tube fitting.
1) Prior to disassembly, mark the tube at the back of the nut, then make a line along the nut and
fitting body flats. These marks will be used during reassembly to ensure the nut is returned to
its current position.
Figure 9 - Marks for Reassembly
2) Disassemble the fitting.
3) Inspect the ferrules for damage and replace if necessary. If the ferrules are replaced the
connector should be treated as a new assembly. Refer to the section above for
installation instructions.
4) Reassemble the fitting by inserting the tube with preswaged ferrules into the fitting until the
front ferrule seats against the fitting body.
Figure 10 - Ferrules Seated Against Fitting Body
5) While holding the fitting body steady, rotate the nut with a wrench to the previous position as
indicated by the marks on the tube and the connector. At this point, there will be a significant
increase in resistance.
6) Tighten the nut slightly.
Figure 11 - Tighten Nut Slightly