00825-0100-3140, Rev AA
Rosemount™ 140/141/142
Contacting Conductivity Sensors
Quick Start Guide
May 2020
Quick Start Guide May 2020
Essential instructions
Read this page before proceeding!
Emerson designs, manufactures, and tests its products to meet many national and international
standards. Because these instruments are sophisticated technical products, you must properly install,
use, and maintain them to ensure they continue to operate within their normal specifications. You
must adhere to the following instructions and integrate them into your safety program when
installing, using, and maintaining Emerson's Rosemount products. Failure to follow the proper
instructions may cause any one of the following situations to occur: loss of life, personal injury,
property damage, damage to this instrument, and warranty invalidation.
• Read all instructions prior to installing, operating, and servicing the product.
• If you do not understand any of the instructions, contact your Emerson representative for
clarification.
• Follow all warnings, cautions, and instructions marked on and supplied with the product.
• Inform and educate your personnel in the proper installation, operation, and maintenance of the
product.
• Install equipment as specified in the installation instructions of the appropriate Reference Manual
and per applicable local and national codes. Connect all products to the proper electrical and
pressure sources.
• To ensure proper performance, use qualified personnel to install, operate, update, program, and
maintain the product.
• When replacement parts are required, ensure that qualified people use replacement parts
specified by Emerson. Unauthorized parts and procedures can affect the product's performance,
place the safe operation of your process at risk, and VOID YOUR WARRANTY. Look-alike
substitutions may result in fire, electrical hazards, or improper operation.
• Ensure that all equipment doors are closed and protective covers are in place, except when
maintenance is being performed by qualified people, to prevent electrical shock and personal
injury.
Note
The information contained in this document is subject to change without notice.
CAUTION
Sensor/Process Application Compatibility
The wetted sensor materials may not be compatible with process composition and operating
conditions. Application compatibility is entirely the responsibility of the user.
CAUTION
Before removing the sensor, be absolutely certain the process pressure is reduced to 0 psig and the
process temperature is at safe level.
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WARNING
Physical access
Unauthorized personnel may potentially cause significant damage to and/or misconfiguration of end
users’ equipment. This could be intentional or unintentional and needs to be protected against.
Physical security is an important part of any security program and fundamental to protecting your
system. Restrict physical access by unauthorized personnel to protect end users’ assets. This is true for
all systems used within the facility.
Contents
Specifications...............................................................................................................................5
Installation................................................................................................................................... 9
Wire Rosemount 140, 141, and 142 sensors...............................................................................14
Retract and insert the Rosemount 141 sensor............................................................................ 18
Remove and reinstall the Rosemount 142 sensor....................................................................... 22
Calibrate and maintain............................................................................................................... 23
Troubleshoot............................................................................................................................. 30
Accessories................................................................................................................................ 34
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1 Specifications
Table 1-1: Rosemount 140 Contacting Conductivity Sensor Specifications
Cell constants
0.1 and 1.0/cm (nominal, to within ±5%)
Wetted materials
Electrodes 316 stainless steel
Body 316 stainless steel
Insulator Polyetheretherketone (PEEK)
O-rings Viton
Temperature range
Standard 32 to 302 °F (0 to 150 °C)
High temperature 32 to 392 °F (0 to 200 °C)
Pressure
100 psig (791 kPa) maximum
Vacuum
At 1.6-in. Hg (5.2 kPa), air leakage is less than 0.005 SCFM (0.00013 m3/min.)
Junction box
Cast aluminum
Process connection
1-in. (25.4 mm) male pipe thread (MPT) through 1-in. (25.4 mm) full port ball valve
(retractable)
Weight/shipping weight
5 lb./6 lb. (2.5 kg/3.0 kg)
(1)
®
(1) Weights rounded up to nearest whole lb. or 0.5 kg.
Table 1-2: Rosemount 141 Contacting Conductivity Sensor Specifications
Cell constants
0.2 and 1.0/cm (nominal, to within ±5%)
Wetted materials
Electrodes 316 stainless steel
Body 316 stainless steel
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Table 1-2: Rosemount 141 Contacting Conductivity Sensor Specifications
(continued)
Insulator PEEK
O-rings Viton
Temperature and pressure
See Figure 1-1.
Vacuum
At 1.6-in. Hg (5.2 kPa), air leakage is less than 0.005 SCFM (0.00014 m3/min.)
Junction box
Cast aluminum
Process connection
¾-in. (19.1 mm) MPT
Weight/shipping weight
2 lb./3 lb. (1.0 kg/1.5 kg)
(1)
Weights rounded up to nearest whole lb. or 0.5 kg.
(1)
Table 1-3: Rosemount 142 Contacting Conductivity Sensor Specifications
Wetted materials
Electrodes 316 stainless steel
Body 316 stainless steel
Insulator PEEK (high temperature option)
PCTFE (low temperature option)
O-rings Viton
Temperature and pressure
See Figure 1-1.
Vacuum
At 1.6-in. Hg (5.2 kPa), air leakage is less than 0.005 SCFM (0.00014 m3/min.)
Junction box
Cast aluminum
Process connection
¾-in. (25.4 mm) MPT
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Table 1-3: Rosemount 142 Contacting Conductivity Sensor Specifications
(continued)
Weight/shipping weight
2 lb./3 lb. (1.0 kg/1.5 kg)
(1) Weights rounded up to nearest whole lb. or 0.5 kg.
(1)
Figure 1-1: Rosemount 141 and 142 Sensor Pressure/Temperature
Graphs
A. Standard
B. High temperature
C. Saturated steam
D. Standard
E. High temperature
F. Saturated steam
Table 1-4: Specifications for PN 23724-00 Ball Valve Kit
Wetted materials
316 stainless steel except PTFE seat and seals in ball valve
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Figure 1-2: Performance Specifications: Contacting Conductivity Recommended Range
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2 Installation
2.1 Unpack and inspect
Procedure
1. Inspect the outside of the carton for any damage.
2. If damage is detected, contact the carrier immediately.
3. Inspect the hardware.
4. Make sure all the items in the packing list are present and in good
condition.
5. Notify the factory if any part is missing.
2.2 Install sensor
Keep ¼ in. (6 mm) clearance between electrodes and piping. The electrodes
must be completely submerged in the process liquid, i.e., to the level of the
threaded connection.
See Figure 2-1 for recommended orientation and installation.
If the sensor is installed in a side stream with the sample draining to open
atmosphere, bubbles may accumulate on the electrodes. Trapped bubbles
will cause errors. As bubbles accumulate, the conductivity reading drops. To
control bubble formation, apply a small amount of back pressure to the
drain.
Figure 2-1: Sensor Orientation
A. Trapped air
B. Trapped sludge
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2.3 Install with ball valve kit (PN 23724-00)
If the ball valve assembly is already in place and the process line is
pressurized, refer to Insert the sensor.
Procedure
1. Install the sensor in either a 1-in. (25.4 mm) national pipe thread
(NPT) weldalet or in a 1-in. (25.4 mm) pipe tee.
2. Remove the plastic shipping cap from the sensor.
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3. Screw the 1-in. (25.4 mm) hex nipple into the weldalet or pipe tee.
Use pipe tape on the threads.
See Figure 2-2.
Figure 2-2: Install with Ball Valve Kit (PN 23724-00)
A. Radius of ball valve kit
B. Process piping
C. Ball valve
D. Sensor compression fitting
E. Sensor
F. 1-in. (25.4 mm) NPT hex nipple
G. Weldalet
H. Put wrench A here and turn.
I. Put wrench B here.
J. Side view
K. Ball valve
L.
CAUTION
Process O-ring must be in place and is critical.
Replace if worn or dirty.
M. Wrench B
N. Top view
O. Wrench A
4. Position the sensor for easy access to the ball valve handle, sensor
compression fitting nut, and junction box.
5. Make sure the ball valve is in the fully open position.
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6. Finger tighten the sensor compression fitting nut.
Do not over tighten because the next step is to press the sensor into
the process pipe.
7. Insert the sensor tube until the sensor tip is no closer than 1 in. (25.4
mm) from the far wall of the process pipe.
See Figure 2-2.
8. Tighten the sensor compression fitting nut to hold the sensor tip in
position.
2.4 Install Rosemount 141 sensor
Procedure
1. Install the sensor in a ¾-in. (25 mm) national pipe thread (NPT)
weldalet or in a 1-in. (25.4 mm) pipe tee.
2. Remove the plastic shipping cap from the sensor.
3. Screw the sensor into the fitting. Use pipe tape on the threads.
See Figure 2-3.
Figure 2-3: Install Rosemount 141 Sensor
A. Flow
B. Sensor
C. Tee
D. Weldalet
E. Process piping
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2.5 Install Rosemount 142 sensor
Procedure
1. Install the sensor in a ¾-in. (25 mm) national pipe thread (NPT)
weldalet or in a 1-in. (25.4 mm) pipe tee.
See Figure 2-4.
Figure 2-4: Install 142 Sensor
A. Flow
B. Tee
C. Sensor
2. Remove the plastic shipping cap from the sensor.
3. Screw the sensor into the fitting. Use pipe tape on the threads.
Important
Do not tighten the sensor compression fitting until the sensor is
correctly positioned.
4. If necessary, loosen the sensor compression fitting and position the
sensor so that the tip of the sensor is at least 1 in. (25.4 mm) from
the far wall of the pipe.
5. Tighten the compression fitting using the procedure shown in Figure
2-2.
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3 Wire Rosemount 140, 141, and 142 sensors
Terminals in the junction box are not numbered.
For other wiring diagrams not shown below, please refer to the Liquid
Transmitter Wiring Diagrams. All Rosemount 140 series sensors have a
junction box mounted on the back of the sensor. Figure 3-1 shows wiring
connections in the junction box. Rosemount 141 and 142 sensors have one
gray wire (shown). The Rosemount 140 sensor has two gray wires attached
to the terminal.
Figure 3-1: Sensor Junction Box Wiring
Table 3-1: Wire Color and Connections in Sensor
Color Function
Gray Connects to outer electrode
Clear Coaxial shield for gray wire
Orange Connects to inner electrode
Clear Coaxial shield for orange wire
Red
White with red stripe
White
A. RTD
B. RTD in
C. RTD sense
D. RTD return
Clear Shield for all RTD lead wires
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Figure 3-2: Rosemount 140/141/142 Sensor Wiring to Rosemount 1056,
56, and 1057 Transmitters
Table 3-2: Rosemount 140/141/142 Sensor Wiring to Rosemount 1056, 56, and
1057 Transmitters
Terminal number Wire color Connects to
1 White RTD return
2 White/red RTD sense
3 Red RTD in
4 Clear RTD shield
5 N/A 4CT B
6 N/A 4CT A
7 Clear Shield 2 count
8 Orange Sensor 2CT B
9 Clear Shield 2 count
10 Gray Sensor 2CT A
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Figure 3-3: Rosemount 140/141/142 Sensor Wiring to Rosemount 1066
Transmitter
Table 3-3: Rosemount 140/141/142 Sensor Wiring to Rosemount 1066
Transmitter
Terminal block number Wire color Connects to
TB1 N/A Receive B
TB1 N/A Receive A
TB1 Clear R shield
TB1 Gray Drive B
TB1 Orange Drive A
TB1 Clear D shield
TB2 White Return
TB2 White/red Sense
TB2 Red RTD in
TB2 Clear Shield
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Figure 3-4: Rosemount 140/141/142 Sensor Wiring to Rosemount 5081
Transmitter
Table 3-4: Rosemount 140/141/142 Sensor Wiring to Rosemount 5081
Transmitter
Terminal
number
1 N/A Reserved 9 N/A Drive shield
2 Clear RTD shield 10 Clear Drive
3 White RTD common 11 Gray Drive
4 White/red RTD sense 12 N/A N/A
5 Red RTD in 13 N/A N/A
6 N/A N/A 14 N/A N/A
7 Clear Receive
8 Orange Receive 16 N/A HART/
Quick Start Guide 17
Wire color Connects to Terminal
number
15 N/A HART®/
common
Wire color Connects to
common
FOUNDATION
Fieldbus (-)
FOUNDATION
Fieldbus (+)
™
Quick Start Guide May 2020
4 Retract and insert the Rosemount 141 sensor
Rosemount 141 sensors are retractable.
WARNING
Before retracting the sensor, be absolutely certain that the process pressure
is less than 100 psig (791 kPa) and the process temperature is at a safe level.
4.1 Retract the sensor
Procedure
1. Push in on the sensor junction box and slowly loosen the sensor
compression fitting nut by reversing the sensor tightening procedure
as listed in Figure 2-2.
2. When the sensor compression nut is completely unscrewed, slowly
ease the sensor out until the flared tip of the electrode rests firmly
within the body of the compression fitting body.
3. Close the ball valve completely.
4.
CAUTION
Before removing the sensor, be sure the ball valve is completely
closed.
Unscrew the compression fitting body from the reducing bushing
and remove the sensor from the ball valve assembly.
4.2
Insert the sensor
CAUTION
Make sure the process O-ring is clean, lubricated, and in place before
installing the center. Replace if worn.
CAUTION
Do not open the ball valve yet.
CAUTION
The system pressure must be less than 100 psig (791 kPa).
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Procedure
1. Thread the sensor compression fitting body into the reducing
bushing in the rear of the ball valve and tighten.
CAUTION
Damage to the sensor could result.
Do not push past this point.
WARNING
If the sensor comes free of the valve, refer to Figure 2-2 and Figure
4-1 and verify that the valve and associated fittings are as shown. Do
not proceed until the sensor is correctly restrained.
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Figure 4-1: Rosemount 140 with Ball Valve Kit (PN 23724-00)
A. Junction box cover
B. Junction box compression fitting (PN 931020)
C. Sensor compression fitting nut, included in kit (PN 23730-00)
D. Polyetheretherketone (PEEK) split ring (inside)
E. PEEK ferrule (inside)
F. Compression fitting body, included in kit (PN 23730-00)
G. Viton® O-ring (inside) (PN 9550200)
H. Reducing bushing
I. Ball valve kit (PN 23724-00)
J. Flared mechanical stop
K. 1-in. (25.4 mm) national pipe thread (NPT) hex nipple
L. Sensor tube
M. Nylon ferrule (inside)
N. Junction box
2. Slowly open the valve.
WARNING
Stand clear of the sensor.
3. Insert the sensor up to the desired insertion depth and turn the
sensor compression fitting nut until it is finger tight.
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4. Position the entire sensor for easy access to the ball valve handle,
sensor compression fitting nut, and junction box terminal block.
5. Tighten sensor compression fitting nut.
CAUTION
For initial installation of the sensor, tighten the compression
fitting nut 1¼ turns after finger tight.
If it is a reinstallation, turn no more than ¼ to ½ additional turns.
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5 Remove and reinstall the Rosemount 142
sensor
5.1 Remove the sensor
WARNING
Before removing the sensor, be absolutely certain that the process pressure
is reduced to 0 psig and the process temperature is lowered to a safe level.
Procedure
1. Reduce process temperature and pressure to a safe level. If
necessary, drain the process line.
2. Loosen the sensor compression fitting and slowly slide the sensor
from the pipe fitting or weldalet.
5.2 Reinstall the sensor
Procedure
1. Slide the sensor into the process fitting and position the sensor the
way it was originally installed.
CAUTION
The sensor tube takes a permanent set and could become weakened
if the new set is adjacent to the original set.
Be sure the sensor is in the original position.
2. Tighten the sensor compression fitting ¼ to ½ turn after it is finger
tight.
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6 Calibrate and maintain
6.1 Calibrate the sensor
Emerson does not calibrate the Rosemount 140/141/142 sensors at the
factory. The cell constant on the label is a nominal value only. The true cell
constant can differ from the nominal value by as much as ±five percent.
For improved accuracy, calibrate the sensor using either a solution of known
conductivity or a referee meter and sensor. If using a standard solution,
choose one having conductivity in the recommended operating range for
the sensor cell constant.
Do not use standard solutions having conductivity less than about 100
µS/cm for calibration. They are susceptible to contamination by atmospheric
carbon dioxide, which can alter the conductivity by a variable amount as
great as 1.2 µS/cm (at 77 °F [25 °C]). Because 0.01/cm sensors must be
calibrated in low conductivity solutions, it is best to calibrate them against a
referee meter and sensor.
6.1.1 Calibrate using a standard solution
If using a standard solution, choose one having conductivity in the
recommended operating range for the sensor cell constant.
Procedure
1. Immerse the rinsed sensor in the standard solution and adjust the
transmitter reading to match the conductivity of the standard.
2. Calibrate the sensor.
For an accurate calibration:
a. Choose a calibration standard near the midpoint of the
recommended conductivity range for the sensor.
b. Do not use calibration standards having conductivity less than
100 µS/cm.
c. Turn off automatic temperature compensation in the
transmitter.
d. Use a standard for which the conductivity as a function of
temperature is known.
e. Use a good quality calibrated thermometer with an error rate
less than ±0.1 °C to measure the temperature of the standard.
f. Follow good laboratory practice. Rinse the beaker and sensor
at least twice with standard. Be sure the rinse solution
reaches between the inner and outer electrodes by tapping
and swirling the sensor while it is immersed in the standard.
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g. Be sure air bubbles are not trapped between the electrodes.
Place the sensor in the standard and tap and swirl to release
bubbles. Note the reading and repeat. If readings agree, no
trapped bubbles are present. Repeat until two subsequent
readings agree.
6.1.2 Calibrate using a reference meter and sensor
Take the following precautions for a successful calibration:
1. If the normal conductivity of the process liquid is less than about
1.0 µS/cm, adjust the conductivity so that it is near the upper end of
the operating range.
The difference between the conductivity measured by the process
and reference meter usually has both a fixed (constant error) and
relative (proportional error) component. Because the cell constant
calibration assumes the error is proportional only, calibration at low
conductivity allows the fixed component to have an outsized
influence on the result.
For example, assume the only difference between reference meter
and process sensor is fixed, and the process sensor always reads
0.002 µS/cm high. If the process sensor is calibrated at 0.100 µS/cm,
the new cell constant will be changed by 0.100/0.102 or two percent.
If the sensor is calibrated at 0.500 µS/cm, the change will be only
0.500/0.502 or 0.4 percent.
Calibration at higher conductivity produces a better result, because it
minimizes the effect of the offset.
2. Orient the sensors so that air bubbles always have an easy escape
path and cannot get trapped between the electrodes.
3. Turn off automatic temperature compensation in the transmitter.
Almost all process conductivity transmitters feature automatic
temperature compensation in which the transmitter applies one of
several temperature correction algorithms to convert the measured
conductivity to the value at a reference temperature, typically 77 °F
(25 °C).
Although temperature correction algorithms are useful for routine
measurements, do not use them during calibration for the following
two reasons:
a. No temperature correction is perfect. If the assumptions
behind the algorithm do not perfectly fit the solution being
measured, the temperature-corrected conductivity will be in
error.
b. If the temperature measurement itself is in error, the
corrected conductivity will be in error.
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The purpose of calibrating the sensor is to determine the cell
constant. To minimize the error in the cell constant, eliminate all
sources of avoidable error, e.g., temperature compensation.
4. Keep tubing runs between the sensors short and adjust the sample
flow as high as possible. Short tubing runs and high flow ensure that
the temperature of the liquid does not change as it flows from one
sensor to another.
If the process temperature is appreciably different from ambient,
high flow may not be enough to keep the temperature constant. In
this case, you may need to pump sample at room temperature from
a reservoir through the sensors. Because such a system is likely to be
open to atmosphere, saturate the liquid with air to prevent drift
caused by absorption of atmospheric carbon dioxide.
5. To prevent contamination of low conductivity (< 1 µS/cm) process
liquids, use clean tubing to connect the sensors. To prevent drift
caused desorption of ionic contaminants from tube walls, keep the
sample flow greater than 6 ft./sec (1.8 m/sec).
Procedure
1. Connect the process sensors and reference sensor in series and allow
the process liquid to flow through all sensors.
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2. Calibrate the process sensor by adjusting the process transmitter
reading to match the conductivity measured by the reference meter.
See Figure 6-1 for the calibration setup.
Figure 6-1: In Process Calibration Setup
A. Sample inlet
B. In process sensors
C. Reference sensor
D. Sample output
Note
Figure 6-1 shows two process sensors connected in series with a
reference sensor. The horizontal sensor orientation ensures good
circulation of the process liquid past the electrodes. The staircase
orientation provides an escape path for bubbles.
This method is ideal for calibrating the sensors used in low
conductivity water (0.01/cm cell constants), because the calibration
system is closed and cannot be contaminated by atmospheric carbon
dioxide.
6.1.3 Calibrate using a grab sample
Use the grab sample method when it is impractical to remove the sensor for
calibration or to connect a reference sensor to the process line.
Procedure
Take a sample of the process liquid, measuring its conductivity using a
reference instrument and adjusting the reading from the process
transmitter to match the measured conductivity.
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Take the sample from a point as close to the process sensor as possible.
Keep temperature compensation turned on. There is likely to be a lag time
between sampling and analysis, so temperature is likely to change.
Be sure the reference and process instruments are using the same
temperature correction algorithm.
Only use grab sample calibration when the conductivity is fairly high.
a. The temperature compensation algorithm will most likely be linear
slope.
b. Confirm that both instruments are using the same temperature
coefficient in the linear slope calculation.
c. If the reference meter does not have automatic temperature
correction, calculate the conductivity at 77 °F (25 °C) using the
equation:
where: C25 = the conductivity at 25 °C
Ct = the conductivity at t °C
α = the temperature coefficient expressed as a decimal fraction
d. Confirm the temperature measurements in both the process and
reference instruments are accurate, ideally to within ±0.5 °C.
e. Follow good laboratory practice when measuring the conductivity of
the grab sample.
• Rinse the beaker and sensor at least twice with sample. Be sure
the rinse solution reaches between the inner and outer
electrodes by tapping and swirling the sensor while it is
immersed in the sample.
• Be sure air bubbles are not trapped in the sensor. Place the sensor
in the sample and tap and swirl to release bubbles. Note the
reading. Then, remove the sensor and return it to the sample.
Tap and swirl again and note the reading. If the two readings
agree, there are no trapped bubbles. If they do not agree,
bubbles are present. Continue the process until two subsequent
readings agree.
• While measuring, do not allow the sensor to touch the sides and,
particularly, the bottom of the beaker. Keep at least ¼-in. (6 mm)
clearance.
f. Be sure to compensate for process conductivity changes that might
have occurred while the grab sample was being tested. Rosemount
conductivity transmitters (Rosemount 1056, 1066, and 56) do this
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Quick Start Guide May 2020
automatically. They save the value of the process conductivity at the
time the sample was taken and use that value to calculate the new
cell constant when you enter the result of the grab sample test. Older
transmitters do not remember the process conductivity value.
Therefore, you must enter a value adjusted by an amount
proportional to the change in the process conductivity. For example,
suppose the process conductivity is 810 µS/cm when the sample is
taken and 815 µS/cm when the test result is entered. If the grab
sample conductivity is 819 µS/cm, enter (815/810) x 819 or
824 µS/cm.
6.2 Clean the sensor
Procedure
Use a warm detergent solution and a soft brush or pipe cleaner to remove oil
and scale.
You can also use isopropyl alcohol to remove oily films. Avoid using strong
mineral acids to clean conductivity sensors.
6.3 Check the Rosemount 140 retraction restraint
The integrity of the Rosemount 140 will become compromised if the flared
tip of the electrode is allowed to blow out against the compression fitting
body.
Procedure
If a blowout occurs, replace the sensor.
6.4
28 Emerson.com/Rosemount
Replace Rosemount 140 sensor seal
If the process seal is leaking owing to a pitted or uneven sensor tube, you
need to replace the sensor. If the sensor tube surface is smooth and clean,
yet the process seal is leaking, the process O-ring is damaged and requires
replacement according to the following procedure. You can obtain
replacement parts from the process fitting rebuild kit (PN 23731-00).
Procedure
1. Recover the junction box with attached compression fitting body,
nut, and compression fitting from the sensor for reuse.
a) Unscrew the junction box cover and set aside.
b) Mark and disconnect the electrical connections from the
terminal block.
c) Remove the junction box compression fitting nut from the
compression fitting body and separate the junction box from
the sensor tube.
May 2020 Quick Start Guide
2. Remove the nylon ferrule and snap ring and discard them. Remove
and save the junction box compression fitting nut.
3. Slide off the sensor compression fitting nut and set aside for reuse.
Slide off the remaining polyetheretherketone (PEEK) ferrule and split
ring and discard them.
4. Slide off the sensor compression fitting body and replace the Viton
®
O-ring. Lubricate the O-ring with the barium based lubricant
provided.
5. Wrap the threads of the sensor compression fitting body with pipe
tape and slide the body on to the sensor tube.
6. Slide on a new PEEK ferrule, beveled side facing the electrode tip, and
a new PEEK split ring, flared end towards electrode tip. Slide on the
compression fitting nut and thread it onto the compression fitting
body. Finger tighten.
7. Reinstall the junction box on the sensor tube. Finger tighten the
junction box compression fitting nut. Use a wrench to turn the nut a
¼ to ½ additional turn.
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Quick Start Guide May 2020
7 Troubleshoot
7.1 Off-scale reading
Potential cause
Wiring is incorrect.
Recommended action
Verify and correct wiring.
Potential cause
Temperature element is open or shorted.
Recommended action
Check temperature element for open or short circuits.
See Figure 7-1.
Figure 7-1: Checking the Temperature Element
A. Resistance temperature device (RTD)
B. Terminal strip in sensor junction box
C. Orange
D. Red
E. Gray
Potential cause
Sensor is not in process stream.
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Recommended action
Submerge sensor completely in process stream.
Potential cause
Sensor has failed.
Recommended action
Perform isolation checks.
See Figure 7-2.
Figure 7-2: Checking the Continuity and Leakage
A. Orange
B. Inner
C. Outer
D. Gray
7.2
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Noisy reading
Potential cause
Sensor is improperly installed in process stream.
Quick Start Guide May 2020
Recommended action
Submerge sensor completely in process stream.
7.3 Reading seems wrong (lower or higher than expected)
Potential cause
Bubbles trapped in sensor.
Recommended actions
1. Ensure the sensor is properly oriented in pipe or flow cell.
See Figure 2-1.
2. Apply back pressure to flow cell.
Potential cause
Wrong temperature correction algorithm is being used.
Recommended action
Check that the temperature correction is appropriate for the sample.
See transmitter Reference Manual for more information.
Potential cause
Wrong cell constant.
Recommended action
Verify that the correct cell constant has been entered in the transmitter
and that the cell constant is appropriate for the conductivity of the
sample.
See transmitter Reference Manual.
7.4
32 Emerson.com/Rosemount
Sluggish response
Potential cause
Electrodes are fouled.
Recommended action
Clean electrodes.
Potential cause
Sensor is installed in dead area in piping.
Recommended action
Move sensor to a location more representative of the process liquid.
May 2020 Quick Start Guide
7.5 Check the temperature element
Procedure
Disconnect leads and measure resistance shown.
The measured resistance should be close to the value in the following table.
Temperature (°C) Resistance in ohms
Pt 100
0 100.0
10 103.9
20 107.8
30 111.7
40 115.5
50 119.4
See Figure 7-1.
7.6 Check the continuity and leakage
Procedure
Disconnect electrode leads and measure resistance and continuity as shown
in Figure 7-2.
The sensor must be dry when checking resistance between electrode leads.
Quick Start Guide 33
Quick Start Guide May 2020
8 Accessories
Table 8-1: Sensor Accessories
Part number Description
23747-06 Junction box for a remote cable connection
9200275 Connecting cable, unterminated, specify length
23747-00 Connecting cable, terminated, specify length
05010781899 Conductivity standard SS-6, 200 µS/cm, 32 oz. (0.95 L)
05010797875 Conductivity standard, SS-6A, 200 µS/cm, 1 gal. (3.78 L)
05010782468 Conductivity standard, SS-5, 1000 µS/cm, 32 oz. (0.95 L)
05010783002 Conductivity standard SS-5A, 1000 µS/cm, 1 gal. (3.78 L)
05000705464 Conductivity standard, SS-1, 1409 µS/cm, 32 oz. (0.95 L)
05000709672 Conductivity standard, SS-1A 1409 µS/cm, 1 gal. (3.78 L)
Table 8-2: Rosemount 140 Sensor Accessories
Part number Description
23724-00 Ball valve kit
23730-00 Process compression fitting, ¾-in. (19.1 mm) national pipe
23731-00 Process fitting rebuild kit
9310120 Junction box compression fitting
9550200 O-ring 2-116, Viton
thread (NPT)
®
Table 8-3: Rosemount 142 Sensor Accessories
Part number Description
33107-01 Compression fitting, ¾ in. (19.1 mm)
9310063 Ferrule, ¾ in. (19.1 mm)
9310066 Compression nut, ¾-in. (19.1 mm)
34 Emerson.com/Rosemount
May 2020 Quick Start Guide
Quick Start Guide 35
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Quick Start Guide
00825-0100-3140, Rev. AA
May 2020
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