Pyxis CR Series User manual

CR Series LPR Corrosion Sensor
User Manual
June 2, 2020
Rev. 1.51
© 2017 Pyxis Lab, Inc.
Pyxis Lab Proprietary and Condenal

Table of Contents
1 Introducon 2
2 Specicaons 3
3 Unpacking Instrument 4
3.1 StandardAccessories ..................................... 4
3.2 OponalAccessories ..................................... 5
4 Installaon 5
4.1 ElectrodeInstallaon ..................................... 5
4.2 Piping ............................................. 6
4.3 Baery Installaon for CR-200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.4 WiringforCR-300....................................... 8
4.5 Connecng via Bluetooth for CR-300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Instrument Overview 12
5.1 TestMetalElectrodes..................................... 12
5.2 DefaultSensorSengs .................................... 14
5.3 CalibraonCheckCaps .................................... 14
5.4 CR-200 Funcon Buons and Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Setup and Calibraon with uPyxis® Mobile App 16
6.1 Download uPyxis® MobileApp................................ 16
6.2 Connecng to uPyxis® MobileApp.............................. 16
6.3 ReadingScreen ........................................ 16
6.4 SengScreen......................................... 16
6.5 DatalogScreenforCR-200 .................................. 17
7 Setup and Calibraon with uPyxis® Desktop App 18
7.1 Install uPyxis® DesktopApp.................................. 18
7.2 Connecng to uPyxis® DesktopApp ............................. 18
7.3 ReadingScreen ........................................ 19
7.4 SengScreen......................................... 20
7.5 DatalogScreenforCR-200 .................................. 20
8 Communicaon using Modbus RTU 21
9 Sensor Maintenance and Precauon 21
10 Regulatory Approval 21
11 Contact Us 22

Warranty Informaon
Condenality
The informaon contained in this manual may be condenal and proprietary and is the property of Pyxis
Lab, Inc. Informaon disclosed herein shall not be used to manufacture, construct, or otherwise reproduce
the goods described. Informaon disclosed herein shall not be disclosed to others or made public in any
manner without the express wrien consent of Pyxis Lab, Inc.
Standard Limited Warranty
Pyxis Lab warrants its products for defects in materials and workmanship. Pyxis Lab will, at its opon, repair
or replace instrument components that prove to be defecve with new or remanufactured components
(i.e., equivalent to new). The warranty set forth is exclusive and no other warranty, whether wrien or oral,
is expressed or implied.
Warranty Term
The Pyxis warranty term is thirteen (13) months ex-works. In no event shall the standard limited warranty
coverage extend beyond thirteen (13) months from original shipment date.
Warranty Service
Damaged or dysfunconal instruments may be returned to Pyxis for repair or r eplacement. In some in-
stances, replacement instruments may be available for short duraon loan or lease.
Pyxis warrants that any labor services provided shall conform to the reasonable standards of technical com-
petency and performance eecve at the me of delivery. All service intervenons are to be reviewed and
authorized as correct and complete at the compleon of the service by a customer representave, or des-
ignate. Pyxis warrants these services for 30 days aer the authorizaon and will correct any qualifying
deciency in labor provided that the labor service deciency is exactly related to the originang event. No
other remedy, other than the provision of labor services, may be applicable.
Repair components (parts and materials), but not consumables, provided during a repair, or purchased
individually, are warranted for 90 days ex-works for materials and workmanship. In no event will the in-
corporaon of a warranted repair component into an instrument extend the whole instrument’s warranty
beyond its original term.
Warranty Shipping
A Repair Authorizaon (RA) Number must be obtained from Pyxis Technical Support before any product can
be returned to the factory. Pyxis will pay freight charges to ship replacement or repaired products to the
customer. The customer shall pay freight charges for returning products to Pyxis. Any product returned to
the factory without an RA number will be returned to the customer.
Chemtrol Technical Support
Contact Chemtrol Technical Support at 1 300 585 820
CR Series User Manual 1

1 Introducon
The Pyxis CR Series corrosion sensor measures the metal corrosion rate in an aqueous environment based
on the principle of linear polarizaon resistance (LPR). A small polarizaon DC voltage is applied to two test
metal electrodes and the resulng current is measured by the sensor. The polarizaon resistance value is
calculated from the measured current and the applied polarizaon voltage. The metal corrosion rate in the
unit of thousandths of inch per year (or mils per year, MPY) is then determined as:
M P Y =B/Rp(1)
where Rpis the polarizaon resistance (LPR) and Bthe proporonal constant.
To calculate Rporiginated from the electrochemical reacon at the metal water interface, the CR Series
sensor subtracts the soluon resistance Rsdue to the test soluon conducvity from the total resistance
measured between the two test electrodes. The CR Series sensor accurately measures the test soluon
conducvity using the two test electrodes and the bipolar pulse technique, which has been successfully
used in other Pyxis conducvity sensors and handheld meters.
A challenge of using the LPR method to measure corrosion rate below 0.01 MPY is to measure electric
current in the range of pico- and nano-amperes. The CR Series sensor adapts a range of techniques that
are pracced in our uorometers where low pico-ampere current is measured. These techniques include
electromagnec interference shielding, special analog circuit designs, and digital signal processing. The
proporonal constant Bhas a theorecal value for a given metal type and size. The CR Series assumes B
equal to 1.24 MPY∙Ω for a 5 cm2mild steel electrode, which is a typical value that has been used in many
LPR corrosion researches. This proporonal constant may be also referred as to the alloy factor of the test
metal and normalized to 1.0 for the steel electrode for convenience. It can be adjusted by the user to ac-
count for variaons in a real applicaon environment.
To determine the corrosion situaon of real process equipment is not a simple maer. The corrosion rates
for various metal surfaces contacng aqueous uids in a process depends on many parameters, including
the corrosivity pertaining to the chemistry of the aqueous uid, physical parameters such as temperature
and the velocity of the uid, and the metallurgical composion of the process equipment itself. Because
of this, the corrosion rate measured by the CR Series sensor should not be used alone to predict or assess
the real corrosion rate of the process equipment. Nevertheless, the science of using the LPR technique to
quanfy the corrosion rate has been well established. The corrosion rate measured by the CR Series sensor
can be used to understand the corrosivity trend of the aqueous uid over a period and its correlaon to
changes in the process parameters.
Measuring corrosion rate using a weight loss corrosion coupon is sll widely pracced in many industry
applicaons. LPR is an instantaneous method compared with the corrosion coupon method. It can indi-
cate a change in corrosion rate in a me scale of a few minutes. In theory, a me-averaged corrosion rate
measured by the Pyxis LPR sensor should agree with that from the weight loss coupon method if both are
pracced according to the common pracces known in the industry. For monitoring mild steel corrosion
rate in an industrial cooling water system, one could also treat the LPR metal electrode itself as the weight
loss corrosion coupon and compare the corrosion rate calculated from the weight loss of the electrode to
the averaged LPR corrosion rate in order to calibrate the LPR corrosion rate by adjusng the alloy factor.
The electrochemical noise measurement has long been used to quanfy the localized corrosion or ping
corrosion rate. The CR Series sensor measures the short circuit electric current owing through the elec-
trodes between the two LPR measurements. The CR Series sensor rst applies a signal process algorithm
CR Series User Manual 2

to remove high frequency noise in the acquired electrochemical current data for a period of 3 minutes
and then calculates the standard deviaon of the processed data set. The standard deviaon calculated is
scaled to generate a localized corrosion index. In such a scaling, the index value for a 304-stainless steel
electrode immersed in a 10% ferric chloride soluon at 72 °F is arbitrarily dened as 100. The real me
electrochemical current noise data are graphically displayed in the Pyxis display panel, an oponal item
that can be purchased separately. With the graphic trend, the noise paern and magnitude can be easily
analyzed visually.
2 Specicaons
Specicaons*CR-200 CR-300
Part Number (P/N) 51006 51007
General Corrosion
Range†0.001–10 MPY
Resoluon 0.001 MPY
Conducvity
Compensaon 10–10,000 µS/cm
Alloy Factor†0–3
Measurement Interval 3–1440 min
Data Storage 6 months‡N/A
Output Bluetooth 4.1, 32  (10 m), Line of
Sight
Two 4–20mA analog outputs,
RS-485 digital output with Modbus
protocol
Installaon Flow cell with 1” NPT
Cable Length N/A 5  (1.5 m)§
Power Supply 3.6 V ER26500 baery 24 VDC, 2 W
Dimensions inch (mm)
Length: 10.3 (260.5), Lower
Diameter: 0.9 (23.0), Upper
Diameter: 1.7 (43.0)
Length: 11.1 (281.5), Lower
Diameter: 0.9 (23.0), Upper
Diameter: 1.7 (43.0)
Weight 1.44 lbs (655 g)|| 1.51 lbs (687 g)
Enclosure Material 304 stainless steel
Sample Temperature -4–122 °F (-20–50 °C)
Operaonal
Temperature 14–122 °F (-10–50 °C)
Storage Temperature -4–158 °F (-20–70 °C)
Pressure Up to 100 psi (0.7 MPa)
Enclosure Rang IP65
Regulaon CE
*With Pyxis’s connuous improvement policy, these specicaons are subject to change without noce.
†Values vary based on metallurgy. See the Test Metal Electrodes secon for a list of these values for commonly
used metals.
‡With measurement interval set to 30 minutes
§Extension cables available
|| Baery included
CR Series User Manual 3

3 Unpacking Instrument
Remove the instrument and nd the standard accessories from the shipping container as listed b elow. In-
spect each item for any damage that may have occurred during shipping. Verify that all accessory items are
included. If any item is missing or damaged, please contact Chemtrol Customer Service
3.1 Standard Accessories
3.1.1 CR-200 Package (P/N: 51006)
• One CR-200 sensor
• One 3.6V ER26500 battery
• One pair of mild steel electrodes (P/N: 51002)
• One pair of copper electrodes (P/N: 51003)
• One 2.0 MPY steel calibration check cap (P/N: 51010)
• One 0.1 MPY copper calibration check cap (P/N: 51011)
• One Bluetooth adapter for PC (P/N: MA-NEB)
• Operation Manual is also available for download at Chemtrol website
3.1.2 CR-300 Package (P/N: 51007)
• One CR-300 sensor
• One 5- extension cable terminated with connectors
• One 2- cable with one end terminated with a connector
• One pair of mild steel electrodes (P/N: 51002)
• One pair of copper electrodes (P/N: 51003)
• One 2.0 MPY steel calibration check cap (P/N: 51010)
• One 0.1 MPY copper calibration check cap (P/N: 51011)
• One Bluetooth Adapter for CR-300 (P/N: MA-CR)
• One Bluetooth adapter for PC (P/N: MA-NEB)
•Operation Manual is also available for download at Chemtrol website
CR Series User Manual 4

3.2 Optional Accessories
The following optional accessories can be purchased via your Regional Sales distributer.
Figure 1.
*NOTE* Pyxis Lab does not manufacture LPR electrodes. Some electrodes are provided by
Pyxis Lab from Metal Samples as a convenience. UNS Codes for each electrode format are
provided in the Test Metal Electrodes section.
4 Installaon
4.1 Electrode Installaon
The CR Series sensor is shipped without the electrodes installed. A pair of copper and mild steel electrodes
are included in the package. Follow the steps below to install either pair of electrodes:
1. Remove the O-rings in the electrode package.
2. Place an O-ring to each threaded rod on the sensor.
3. Fasten the electrodes to the threaded rods to slightly compress the O-ring on the boom of the
threaded rod.
4. Clean the electrodes with isopropanol to remove any oil or other foreign materials on the electrode
surfaces.
CR Series User Manual 5

4.2 Piping
Figure 2. CR Series installaon into the sample ow line
The CR Series should be inserted into a pipe via a 1-inch threaded tee. The corrosion rate measured by the
CR Series sensor may be aected by the posion of the two-test metal electrodes in relaon to the water
ow. The electrodes should be fully immersed in the water sample and away from any turbulence. The
sensor body has three O-ring grooves to allow the 1-inch male NPT thread to be locked at three posions
on the sensor with a compression nut. Thus, the depth of the sensor inseron in the pipe can be adjusted.
For the best performance, the two-test metal electrodes should be installed to be parallel to the ow and
maintain a symmetry between the electrodes with respect to the ow environment as much as possible as
seen in Figure 2. Figures 3 and 4 show the dimensions of the CR-200 and CR-300, respecvely.
Figure 3. CR-200 dimensions in inch (mm)
CR Series User Manual 6

Figure 4. CR-300 dimensions in inch (mm)
4.3 Baery Installaon for CR-200
The 3.6 V ER26500 baery should be used and is available from Pyxis (P/N: 50730).
Figure 5. ER26500 baery (P/N: 50730)
WARNING
Do NOT use type C alkaline baeries for CR-200. Although type C alkaline baeries are in the same
dimensions as ER26500 lithium, they are 1.5 V nominal voltage baeries. CR-200 will NOT work with
type C alkaline baeries.
See detailed instruconal video (hps://www.youtube.com/watch?v=8LHabJX8Sx0) or follow the steps be-
low to install the ER26500 baery into the CR-200:
1. Loosen the two screws that fasten the baery cover plate (Figure 6).
2. Separate the cover plate from the CR-200 body (Figure 7).
*NOTE*Do NOT twist the cover plate
3. Place an ER26500 baery to the CR-200. Make sure that the posive terminal of the baery is facing
outward (Figure 8).
4. Place the baery cover plate back and fasten the two screws. Please make sure that the at cable
has been fully pushed inside the CR-200 baery compartment and avoid pinching the cable between
the CR-200 body and the cover plate (Figure 9).
CR Series User Manual 7

Figure 6. Figure 7.
Figure 8. Figure 9.
4.4 Wiring for CR-300
If the power ground terminal and the negave 4–20mA terminal in the controller are internally connected
(non-isolated 4–20mA input), it is unnecessary to connect the 4–20mA negave wire (Gray) to the 4–20mA
negave terminal in the controller. If a separate DC power supply other than that from the controller is
used, make sure that the output from the power supply is rated for 22–26 VDC @ 65mA.
*NOTE*The negave 24V power terminal (power ground) and the negave 4–20mA ter-
minal on the CR-300 sensor are internally connected.
Follow the wiring table below to connect the CR-300 sensor to a controller:
Wire Color Designaon
Red 24V +
Brown 24V Power ground
White General corrosion rate, 4–20mA +
Pink Localized corrosion rate, 4–20mA +
Gray*4–20mA -
Blue RS-485 A
Yellow RS-485 B
Green Shield, earth ground
*Internally connected to the power ground
CR Series User Manual 8

4.5 Connecng via Bluetooth for CR-300
A Bluetooth adapter (P/N: MA-CR) can be used to connect a CR-300 sensor to a smart phone with the uP-
yxis® Mobile App or a computer with the uPyxis® Desktop App. The power should be sourced from a 24
VDC power terminal of a controller. If a controller is not available, the user may also use Pyxis PowerPACK-1
or PowerPACK-4 as an alternave to both an external power supply and a Bluetooth adapter. PowerPACK
from Pyxis Lab oers external power, Input/Output signal, and Bluetooth connecvity.
Figure 15. Bluetooth connecon to CR-300 sensor
5 Instrument Overview
5.1 Test Metal Electrodes
Figure 16. Test Metal Electrode Dimensions, Inch [mm]
Pyxis provides pairs of 5-cm2(0.736-inch2) metal electrodes, commonly used in the LPR corrosion measure-
ment applicaons. The common names, UNS codes, and alloy factors are listed the table below.
CR Series User Manual 12

Common Designaon UNS Alloy Factor
Default 4–20mA
General
Corrosion Scale
(MPY)
Default 4–20mA
Localized
Corrosion Scale
(MPY)
Pipe Grate Carbon Steel A135 1.00 0–10 0–100
Aluminum AA1100 A91100 0.94 0–10 0–100
Aluminum AA2024 A92024 0.86 0–10 0–100
Aluminum AA6061 A96061 0.94 0–10 0–100
Copper 110 ETP C11000 2.00 0–1 0–10
Arsenical Admiralty
Brass CDA443 C44300 1.67 0–1 0–10
Phosphorized Admiralty
Brass CDA445 C44500 1.68 0–1 0–10
Aluminum Silicon
Bronze CDA642 C64200 1.48 0–1 0–10
Aluminum Brass
Arsenical CDA687 C68700 1.62 0–1 0–10
Cu/Ni - 70/30 C71500 1.50 0–1 0–10
Mild Steel C1010 G10100 1.00 0–10 0–100
Mild Steel C1015 G10150 1.00 0–10 0–100
Mild Steel C1018 G10180 1.00 0–10 0–100
Mild Steel C1019 G10190 1.00 0–10 0–100
Mild Steel C1020 G10200 1.00 0–10 0–100
Mild Steel C1080 G10800 1.00 0–10 0–100
Common Lead L50045 2.57 0–0.5 0–1
Stainless Steel 304 S30400 0.89 0–0.5 0–10
Stainless Steel 304L S30403 0.89 0–0.5 0–10
Stainless Steel 316 S31600 0.90 0–0.5 0–10
Stainless Steel 316L S31603 0.90 0–0.5 0–10
Duplex Stainless Steel
2205 - F51 S31803 0.90 0–0.5 0–10
Duplex Stainless Steel
2507 - F53 S32750 0.90 0–0.5 0–10
*NOTE*Metal electrodes with a dierent length and a slightly dierent diameter may be
used with the CR Series sensor if the electrodes have a 4-40 internal thread and has a surface
area of 5 cm2(0.736 inch2). The alloy factor for a given metal alloy is proporonal to the
surface area of the electrode. If an electrode with a surface area dierent than 5 cm2(0.736
inch2) is used, the user will need to calculate the proper alloy factor according to the surface
area and the default 5-cm2alloy factor listed above.
CR Series User Manual 13

5.2 Default Sensor Sengs
The CR Series sensor is shipped with the following default sengs:
• Reading interval is 60 minutes for CR-200 and 3 minutes for CR-300
• Metal selecon of Mild Steel C1010 (same as one of the provided pairs of electrodes)
• 4 mA = 0 MPY or 0 localized corrosion index
• 20 mA = 10 MPY (general corrosion)
• 20 mA = 100 MPY (localized corrosion)
For measuring the general corrosion rate of mild steel, the user needs to scale 20 mA = 10 MPY in the
controller. If a dierent metallurgy is desired, refer to the Test Metal Electrodes secon for a list of all
metallurgies and preprogrammed default alloy factors and 4–20mA output scales.
5.3 Calibraon Check Caps
The CR Series sensor is provided with one 2.0 MPY-Steel and one 0.1 MPY-Copper calibraon check cap.
These caps are designed to generate a known mA value and can be used to conrm that the sensor has
been congured properly. For the CR-300, this can conrm the receiving controller is setup with the proper
4–20mA scale for general corrosion. When the controller is scaled to match the uPyxis® default sengs,
these caps will generate a “test” signal matching the value on the calibraon check cap to conrm the
controller reads properly.
Follow the steps below to check the calibraon of the CR Series sensor’s 4–20mA range:
1. Install two new test electrodes (either Steel or Copper)
2. Connect to either the uPyxis® Mobile or Desktop App. See either the Setup and Calibraon with
uPyxis® Mobile App or the Setup and Calibraon with uPyxis® Mobile App secon.
3. In the uPyxis® App, change the Reading Interval to 5 minutes.
4. If needed, change the Metal Selecon, the Corrosion 20 mA MPY value, and the Ping 20 mA MPY
value to match the values given from the Test Metal Electrodes secon.
5. Plug the sensor to the appropriate calibraon check cap and wait for at least for 15 minutes to allow
the sensor to carry out three complete measurements (Figure 17).
6. Tthe corrosion rate value on the uPyxis® App should match the value marked on the calibraon check
cap.
*NOTE*If checking the CR-300 sensor’s 4–20mA range, the user may use the controller in-
stead of the uPyxis® App to verify the calibraon. This assumes that the controller’s analog
input 4–20mA range is set to the same range as determined in Step 4.
CR Series User Manual 14

Figure 17.
5.4 CR-200 Funcon Buons and Indicator Lights
Figure 18.
5.4.1 Powering On/O
Press the ON/OFF buon to turn on the sensor and Bluetooth (Figure 18). The green indicator light on the
le and blue indicator light on the right will turn on for approximately two seconds. Aer the inial startup,
the green indicator light on the le will ash every 5 seconds, connuously, to indicate that the sensor is in
the measurement mode.
Press and hold the ON/OFF buon for 3 seconds to turn o the CR-200. The green indicator light on the
le will stop ashing.
5.4.2 Bluetooth Modes
The CR-200 will startup in the default Beacon mode. This mode allows mulple devices with the uPyxis®
App to view the current readings of the CR-200, however, sengs cannot be changed.
Press and hold the Bluetooth Mode buon on the CR-200 for up to 20 seconds, unl the blue indicator
light turns on, to switch to the Peripheral (Pairing) mode. In this mode, the blue indicator light will begin
ashing unl paired to the uPyxis® App. The blue indicator light will remain solid blue while paired. Only
one device can be paired at a me.
CR Series User Manual 15

6 Setup and Calibraon with uPyxis® Mobile App
The default conguraon of the CR Series sensor before shipping is to measure the corrosion rate of mild
steel. The alloy factor was set to be the theorecal value of iron. The sensor can be congured for other
metals with appropriate alloy factors and the 4–20mA scale sengs for general and localized corrosion
rates using the uPyxis® Mobile or Desktop App.
6.1 Download uPyxis® Mobile App
Download uPyxis® Mobile App from Apple App Store or Google Play.
Figure 19.
6.2 Connecng to uPyxis® Mobile App
For the CR-200 sensor, make sure the sensor is set to the Peripheral (Pairing) Bluetooth mode. See the
Bluetooth Modes secon for more details. For the CR-300 sensor, make sure the sensor is connected to a
MA-CR and a power supply, such as a controller, or to a PowerPACK. See the Connecng via Bluetooth for
CR-300 secon for more details.
Turn on Bluetooth on your mobile phone (Do not pair the phone Bluetooth to the CR Series sensor). Open
uPyxis® Mobile App. Once the app is open the app will start to search for the sensor. Once the uPyxis®
Mobile App connects to the sensor, press the CR Series sensor (Figure 20).
6.3 Reading Screen
When connected, the uPyxis® Mobile App will default to the Reading screen (Figure 21). From the Reading
screen, you can perform a calibraon by pressing on Slope Calibraon. Follow the screen instrucons for
each calibraon step.
6.4 Seng Screen
From the Seng screen, you can set the Reading Interval, the Metal Selecon, the corrosion MPY value for
20 mA, the ping value for 20 mA, two smoothing factors, and a password for the device (Figure 22–23).
Be sure to press Apply Sengs to save any changes.
CR Series User Manual 16

6.5 Datalog Screen for CR-200
The CR-200 will have an addional Datalog screen (Figure 24). From the Datalog screen, press READ INFO
to read in all available datalogs from the device. You may then choose to Clear Datalog or to Export & Share
as a CSV le.
Figure 20. Connect to CR-300 Figure 21. Reading screen Figure 22. Seng screen (top)
Figure 23. Seng screen (boom) Figure 24. Datalog screen for CR-200
CR Series User Manual 17

7 Setup and Calibraon with uPyxis® Desktop App
The default conguraon of the CR Series sensor before shipping is to measure the corrosion rate of mild
steel. The alloy factor was set to be the theorecal value of i ron. The sensor can be congured for other
metals with appropriate alloy factors and the 4–20mA scale sengs for general and localized corrosion
rates using the uPyxis® Mobile or Desktop App.
7.1 Install uPyxis® Desktop App
Download the latest version of uPyxis® Desktop software package. This setup package will download
and install the Microsoft.Net Framework 4.5 (if not previously installed on the PC), the USB driver for the
USB-Bluetooth adapter (MA-NEB), the USB-RS485 adapter (MA-485), and the main uPyxis® Desktop
application. Double click the uPyxis.Setup.exe file to install.
Figure 25.
Click Install to start the installaon process. Follow the screen instrucons to complete the USB driver and
uPyxis® installaon.
7.2 Connecng to uPyxis® Desktop App
For the CR-200 sensor, make sure the sensor is set to the Peripheral (Pairing) Bluetooth mode. See the
Bluetooth Modes secon for more details. For the CR-300 sensor, make sure the sensor is connected to a
MA-CR and a power supply, such as a controller, or to a PowerPACK. See the Connecng via Bluetooth for
CR-300 secon for more details.
When the uPyxis® Desktop App opens, to nd your device, click on Device, then Connect via Bluetooth...
(Figure 26). Once connected to the device, a picture of the device will appear on the top le corner of the
window and the uPyxis® Desktop App will default to the Informaon screen.
CR Series User Manual 18

Figure 26.
7.3 Reading Screen
From the Reading Screen, you can view the current corrosion and ping data as well as the trend data
(Figure 27).
Figure 27.
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7.4 Seng Screen
From the Seng screen, you can set the Reading Interval, the Metal Selecon, the corrosion MPY value for
20 mA, the ping value for 20 mA, and two smoothing factors (Figure 28). Be sure to click Apply Sengs
to save any changes.
Figure 28.
7.5 Datalog Screen for CR-200
The CR-200 will have an addional Datalog screen (Figure 29). From the Datalog screen, click Read Datalog
Info to read in all available datalogs from the device. You may then choose to Clear All Datalogs or to Export
as a CSV le.
Figure 29.
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8 Communicaon using Modbus RTU
The CR-300 can be congured as a Modbus slave d evice. In a ddion to th e general corrosion rate and
localized corrosion index, many operational parameters, including warning and error messages, are
avail-able via a Modbus RTU connection.
9 Sensor Maintenance and Precaution
For best performance, severely corroded sensor metal electrodes should be replaced. Any deposit on the
sensor body and near the base area of the metal electrode should be cleared. Minor corrosion product
deposit on the electrode surface is acceptable. Non-corrosion product deposit such as calcium carbonate
scale should be removed. The sensor should not be le in stagnant water for a long period unless measuring
corrosion rate of the metal in such condition is the purpose for evaluation.
10 Regulatory Approval
United States
The CR-200 sensor has been tested and found to comply with the limits for a Class B digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiate radio
frequency energy, and if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in
an installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment o and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separaon between the equipment and receiver.
• Connect the equipment into an outlet on a circuit dierent from that to which the receiver is con-
nected.
• Consult the dealer or an experienced radio/TV technician for help.
Canada
This device complies with Industry Canada license exempt RSS standard(s). Operaon is subject to the
following two condions: (1) this device may not cause interference, and (2) this device must accept any in-
terference, including interference that may cause undesired operaon of the device. Le présent appareil est
conforme aux CNR d’Industrie Canada applicables aux appareils radio exempts de licence. L’exploitaon est
autorisée aux deux condions suivantes: (1) l’appareil ne doit pas produire de brouillage, et (2) l’ulisateur
de l’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est suscepble
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