Endress+Hauser CA76NA User manual

Products Solutions Services
Operating Instructions
CA76NA
Analyzer for sodium
BA01706C/07/EN/04.22-00
71578460
2022-04-01
Valid as of version
V1.14.00

CA76NA Table of contents
Endress+Hauser 3
Table of contents
1 About this document ................ 4
1.1 Symbols used .......................... 4
1.2 Documentation ........................ 5
2 Basic safety instructions ............ 6
2.1 Requirements for the personnel ............ 6
2.2 Intended use .......................... 6
2.3 Workplace safety ....................... 6
2.4 Operational safety ...................... 6
2.5 Product safety ......................... 7
2.6 IT security ............................ 7
3 Product description ................. 8
3.1 Product design ......................... 8
3.2 Operating principle .................... 11
4 Incoming acceptance and product
identification ..................... 13
4.1 Incoming acceptance ................... 13
4.2 Product identification ................... 13
4.3 Storage and transport .................. 14
5 Mounting ......................... 15
5.1 Mounting requirements ................. 15
5.2 Mounting the analyzer on a vertical surface .. 17
5.3 Post-mounting check ................... 17
6 Electrical connection .............. 18
6.1 Connecting requirements ................ 18
6.2 Connecting the analyzer ................. 18
6.3 Ensuring the degree of protection .......... 21
6.4 Post-connection check .................. 21
7 Operation options ................. 22
7.1 Structure and function of the operating
menu .............................. 22
8 Commissioning .................... 23
8.1 Preliminaries ......................... 23
8.2 Setting up PROFIBUS communication ....... 29
8.3 Function check ....................... 30
8.4 Switching on the measuring device ......... 30
8.5 Configuring the measuring device .......... 30
9 Operation ......................... 32
9.1 Main menu, measured value display ........ 32
9.2 Diagnosis ........................... 33
9.3 Maintenance ......................... 35
9.4 Parameters .......................... 38
9.5 PROFIBUS parameters .................. 40
10 Diagnostics and troubleshooting ... 46
10.1 Diagnostic list ........................ 46
10.2 Reset measuring device ................. 47
10.3 Firmware history ...................... 48
11 Maintenance ...................... 49
11.1 Maintenance schedule .................. 49
11.2 Maintenance tasks ..................... 49
11.3 Taking out of service ................... 60
12 Repair ............................ 61
12.1 General information ................... 61
12.2 Spare parts .......................... 61
12.3 Return .............................. 61
12.4 Disposal ............................ 61
13 Accessories ....................... 63
13.1 Device-specific accessories ............... 63
14 Technical data .................... 65
14.1 Input ............................... 65
14.2 Output ............................. 65
14.3 Power supply ......................... 66
14.4 Performance characteristics .............. 66
14.5 Environment ......................... 67
14.6 Process ............................. 67
14.7 Mechanical construction ................ 68
Index .................................. 69

About this document CA76NA
4 Endress+Hauser
1 About this document
1.1 Symbols used
1.1.1 Warnings
Structure of information Meaning
LDANGER
Causes (/consequences)
If necessary, Consequences of
non-compliance (if applicable)
‣Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation will result in a fatal or serious
injury.
LWARNING
Causes (/consequences)
If necessary, Consequences of
non-compliance (if applicable)
‣Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation can result in a fatal or serious
injury.
LCAUTION
Causes (/consequences)
If necessary, Consequences of
non-compliance (if applicable)
‣Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid this situation can result in minor or more serious injuries.
NOTICE
Cause/situation
If necessary, Consequences of
non-compliance (if applicable)
‣Action/note
This symbol alerts you to situations which may result in damage to
property.
1.1.2 Symbols
Additional information, tips
Permitted or recommended
Not permitted or not recommended
Reference to device documentation
Reference to page
Reference to graphic
 Result of a step

CA76NA About this document
Endress+Hauser 5
1.1.3 Symbols on the device
Symbol Meaning
Caution: Hazardous voltage
No naked flames
Fire, open sources of ignition and smoking are forbidden
Eating and drinking are forbidden
Wear eye protection goggles
Wear safety gloves
Reference to device documentation
1.2 Documentation
The following instructions complement these Operating Instructions and are available on
the product pages on the Internet:
Installation Instructions, EA01214C

Basic safety instructions CA76NA
6 Endress+Hauser
2 Basic safety instructions
2.1 Requirements for the personnel
• Installation, commissioning, operation and maintenance of the measuring system may
be carried out only by specially trained technical personnel.
• The technical personnel must be authorized by the plant operator to carry out the
specified activities.
• The electrical connection may be performed only by an electrical technician.
• The technical personnel must have read and understood these Operating Instructions
and must follow the instructions contained therein.
• Faults at the measuring point may only be rectified by authorized and specially trained
personnel.
Repairs not described in the Operating Instructions provided must be carried out only
directly at the manufacturer's site or by the service organization.
2.2 Intended use
CA76NA is an analyzer designed for the continuous measurement of the concentration of
sodium in aqueous solutions.
The analyzer is designed for use in the following applications:
• Monitoring of the water/steam circuit in power plants, particularly for condenser
monitoring
• Quality assurance of demineralization systems and seawater desalination
• Quality assurance of the ultrapure water circuit in the semi-conductor and electronics
industry
Use of the device for any purpose other than that described, poses a threat to the safety of
people and of the entire measuring system and is therefore not permitted. The
manufacturer is not liable for damage caused by improper or non-designated use.
2.3 Workplace safety
As the user, you are responsible for complying with the following safety conditions:
• Installation guidelines
• Local standards and regulations
Electromagnetic compatibility
• The product has been tested for electromagnetic compatibility in accordance with the
applicable international standards for industrial applications.
• The electromagnetic compatibility indicated applies only to a product that has been
connected in accordance with these Operating Instructions.
2.4 Operational safety
LWARNING
Contact of chemicals with eyes and skin, and inhalation of vapors
Damage to the skin, eyes and respiratory organs
‣Wear protective goggles, protective gloves and a lab coat when working with chemicals.
‣Avoid any skin contact with chemicals.
‣Do not inhale any vapors.
‣Ensure the area is well ventilated.
‣Comply with further instructions in the safety data sheets for the chemicals used.

CA76NA Basic safety instructions
Endress+Hauser 7
2.5 Product safety
2.5.1 State-of-the-art technology
The product is designed to meet state-of-the-art safety requirements, has been tested, and
left the factory in a condition in which it is safe to operate. The relevant regulations and
international standards have been observed.
Devices connected to the analyzer must comply with the applicable safety standards.
2.6 IT security
We only provide a warranty if the device is installed and used as described in the
Operating Instructions. The device is equipped with security mechanisms to protect it
against any inadvertent changes to the device settings.
IT security measures in line with operators' security standards and designed to provide
additional protection for the device and device data transfer must be implemented by the
operators themselves.

Product description CA76NA
8 Endress+Hauser
3 Product description
3.1 Product design
3.1.1 Main components
12
3
4
5
6
7
8
9
10
11
A0047852
 1 Main components
1 Power switch 7 Bottle for lab sample
2 Electronics unit 8 Sample conditioning unit (controls and filters the flow of sample)
3 Amplifier 9 Measuring unit with supply vessel
4 Bottle with alkalization reagent 10 Alkalization unit
5 Liquid control unit 11 Overflow vessel with level control
6 Bottle with sodium stock solution

CA76NA Product description
Endress+Hauser 9
3.1.2 Liquid control unit
12
3
4
67
9
10
58
A0047855
 2 Liquid control unit including measuring unit and supply vessel
1 Sample outlet, circuit 7 Housing outlet
2 Outlet after alkalization pump 8 Sample outlet, calibration
3 Inlet of alkalization pump 9 Temperature sensor
4 Inlet, standard solution 10 Fold-out housing
5 Inlet, laboratory sample Na+ Sodium sensor
6 Sample outlet, measurement pH pH sensor

Product description CA76NA
10 Endress+Hauser
3.1.3 Sample conditioning unit
12
45
63
A0047864
 3 Sample conditioning unit
1 Solenoid valve
2 Outlet to analyzer
3 Overflow valve
4 Sample outlet (bypass at solenoid valve)
5 Filter
6 Control valve (set sampling volume, for even sample overflow)
The sample conditioning unit performs the following tasks:
• Filters the sample
• Controls the flow of sample
• Limits the maximum pressure to 1 bar (14.5 psi)
• Provides fresh sample to every channel
If a channel is being measured, the corresponding solenoid valve (1) for the channel
opens. The sample flows to the overflow vessel. The rest of the time the sample drains off
via the bypass at the solenoid valve (4).
Each channel needs a minimum overpressure of 0.5 bar (7.3 psi) and a sample flow of
10 l/h (2.64 gal/hr). The maximum permitted supply pressure is 5 bar (72.5 psi).
3.1.4 Measuring system
A complete measuring system comprises:
• Analyzer CA76NA
• Sodium electrode (not included with the analyzer, can be ordered as an accessory)
→  63
• pH electrode (not included with the analyzer, can be ordered as an accessory)
→  63
• Standard solution (not included with the analyzer, can be ordered as an accessory)
→  63
• Alkalization reagent (recommended: diisopropylamine (DIPA), to be purchased
separately, > 99.0 % (GC), in a bottle made from a solid material, e.g. glass).

CA76NA Product description
Endress+Hauser 11
The measurement system in the flow direction consists of a sodium electrode (measuring
electrode), a temperature sensor and a pH electrode (reference electrode).
The sodium electrode measures the concentration of sodium ions in the sample. Its ion-
selective glass membrane allows Na+ ions to pass through.
The pH electrode has 2 specific functions:
• It serves as a reference for the sodium electrode.
• It measures the pH value of the sample.
The sample needs to have a pH value of > 10.8. Otherwise, H+ ions in the sample would
influence the measurement of the Na+ ions. The pH value of the sample is increased to
11.0 by adding an alkalization reagent, e.g. diisopropylamine. The amount of alkalization
reagent to be added is regulated by measuring the pH.
The Na electrode system has the following electrochemical structure:
Ag/AgCl(S) – sodium electrolyte – Na+-sensitive glass membrane - alkalized measuring
solution - diaphragm - KCl electrolyte gel - AgCl(S)/Ag
The potential of the sodium electrode is measured against the reference of the pH
electrode.
3.1.5 Calibration unit
The calibration unit consists of the following main components:
• Supply vessel with standard solution pump
• Manifold with 3 solenoid valves for draining, circuit flow and lab samples
• Circuit pump for draining, circuit and supply of lab samples
• Standard solution (available for order as an accessory →  63)
3.2 Operating principle
3.2.1 Measuring principle
The analyzer measures the concentration of dissolved sodium ions.
Sodium measurement is potentiometric using ion-selective glass electrodes.
An advanced Nernst equation describes in principal the processes at the ion-selective glass
membrane:
U = U
i 0
2.303 RT
Flog (a + K
Na Na
Σ
·
+
a )
x
+
·
+/zx
- 1
A0034599
UiMeasured value in mV
U0Standard potential
R Relative gas constant (8.3143 J/molK)
T Temperature [K]
F Faraday constant (26.803 Ah)
aNa+ Activity of Na+ ions
KNa+ Selectivity coefficient
axActivity of interference ion
zxValue of interference ion
The slope of the Nernst equation (2.303RT/F) is known as the Nernst factor and has
a value of 59.16 mV/px at 25 °C.

Product description CA76NA
12 Endress+Hauser
The pH electrode has 2 specific functions:
• It serves as the reference point for the sodium electrode.
• It measures the pH value of the sample.
To also be able to measure Na+ in very low concentrations, the Ag+ and H+ activity must be
well below the Na+ concentration to be measured. In this case, the pH value present must
be more than 10.8. The device is set to a pH target value of 11.00 as standard to
sufficiently safeguard the set pH value.
The pH value of the sample is increased to 11.0 by adding an alkalization reagent, e.g.
diisopropylamine.
The sensitivity of the measuring arrangement to interference ions is according to the
following rule:
Ag+ >> H+ >> Na+ > >Li+ > K+
3.2.2 Sample conditioning
Sample conditioning consists of the following main components:
• Alkalization pump
• Bottle with alkalization reagent
• Overflow vessel
• Alkalization vessel
It performs the following tasks:
• Monitors the flow of sample with a level switch in the overflow vessel
• Maintains a constant pressure through the overflow vessel to ensure constant flow
• Alkalizes the sample with pH regulation in the alkalization vessel
Purchase alkalization reagent separately (recommended: diisopropylamine (DIPA),
> 99.0 % (GC), in a bottle made from a solid material, e.g. glass).

CA76NA Incoming acceptance and product identification
Endress+Hauser 13
4 Incoming acceptance and product
identification
4.1 Incoming acceptance
1. Verify that the packaging is undamaged.
 Notify the supplier of any damage to the packaging.
Keep the damaged packaging until the issue has been resolved.
2. Verify that the contents are undamaged.
 Notify the supplier of any damage to the delivery contents.
Keep the damaged goods until the issue has been resolved.
3. Check that the delivery is complete and nothing is missing.
 Compare the shipping documents with your order.
4. Pack the product for storage and transportation in such a way that it is protected
against impact and moisture.
 The original packaging offers the best protection.
Make sure to comply with the permitted ambient conditions.
If you have any questions, please contact your supplier or your local Sales Center.
4.1.1 Scope of delivery
The scope of delivery comprises:
• 1 analyzer
• 1 print version of the Brief Operating Instructions in the language ordered
The sodium electrode, pH electrode, standard solution and alkalization reagent are
not included in the delivery for the analyzer.
Before commissioning the analyzer, order the sodium electrode, pH electrode and
standard solution as a "starter kit" accessory. →  63
Purchase alkalization reagent separately (recommended: diisopropylamine (DIPA),
> 99.0 % (GC), in a bottle made from a solid material, e.g. glass.
‣If you have any queries:
Please contact your supplier or local sales center.
4.2 Product identification
4.2.1 Nameplate
The nameplate is located on the panel.
The nameplate provides you with the following information on your device:
• Manufacturer identification
• Order code
• Serial number
• Extended order code
• Input and output values
• Ambient temperature
• Safety information and warnings
• Approvals as per version ordered
‣Compare the data on the nameplate with your order.

Incoming acceptance and product identification CA76NA
14 Endress+Hauser
4.2.2 Product identification
Product page
www.endress.com/ca76na
Interpreting the order code
The order code and serial number of your product can be found in the following locations:
• On the nameplate
• In the delivery papers
Obtaining information on the product
1. Go to www.endress.com.
2. Page search (magnifying glass symbol): Enter valid serial number.
3. Search (magnifying glass).
 The product structure is displayed in a popup window.
4. Click the product overview.
 A new window opens. Here you fill information pertaining to your device,
including the product documentation.
4.3 Storage and transport
1. Store the measuring device in a dry space where it is protected against moisture.
2. At temperatures around or below freezing, ensure there is no water in the device.
3. Store the alkalization reagent and electrodes at temperatures above +5 °C (41 °F).
4. Observe the permitted storage temperatures →  67.

CA76NA Mounting
Endress+Hauser 15
5 Mounting
LCAUTION
Danger of crushing or entrapment if the analyzer is mounted or disassembled
incorrectly
‣Two people are needed to mount and disassemble the analyzer.
‣Wear suitable protective gloves to protect against mechanical risks.
‣Comply with minimum spacing requirements when mounting.
‣Use the spacers provided when mounting.
5.1 Mounting requirements
5.1.1 Mounting options
Mounted on a vertical surface:
• Wall
• Mounting plate
5.1.2 Dimensions
The mounting materials required to secure the device to the wall (screws, wall plugs) are
not supplied.
‣Provide mounting materials on site.

Mounting CA76NA
16 Endress+Hauser
ESC !
190 (7.48)
20 (0.79)
450 (17.7)
424 (16.7)
850 (33.5) 817 (32.2) 13 (0.51)
(4x)10 x 7 (0.39 x 0.28)
31 (1.22)
61 (2.40)
91 (3.58)
121 (4.76)
151 (5.94)
181 (7.13)
217 (8.54)
A0047739
 4 Analyzer CA76NA. Unit of measurement mm (in)
5.1.3 Installation site
Please note the following:
1. Protect the device against mechanical vibrations.
2. Protect the device against chemical exposure.
3. Do not expose the device to very dusty environments.
4. Install the device in a dry environment.
5. Make sure that the wall has sufficient load-bearing capacity and is fully
perpendicular.
6. Make sure that the device is horizontally aligned and is mounted on a vertical surface
(mounting plate or wall).
7. Protect the device from additional heating (e.g. from heaters or direct sunlight).
Comply with the following minimum spacing requirements:
• at least 10 mm (0.39 in) at the sides of the analyzer
• at least 550 mm (21.7 in) in front of the analyzer
• at least 200 mm (7.87 in) under the analyzer since cables and water conduits are
connected from below

CA76NA Mounting
Endress+Hauser 17
5.2 Mounting the analyzer on a vertical surface
10 (0.39)
200 (7.87)
10 (0.39)
560 (22.4)
ESC !
A0049178
 5 Analyzer CA76NA, spacing requirements in mm (in)
‣Observe the required distances when mounting.
5.3 Post-mounting check
After mounting, check all the connections to ensure they are secure.

Electrical connection CA76NA
18 Endress+Hauser
6 Electrical connection
LWARNING
Device is live!
Incorrect connection may result in injury or death!
‣The electrical connection may be performed only by an electrical technician.
‣The electrical technician must have read and understood these Operating Instructions
and must follow the instructions contained therein.
‣Prior to commencing connection work, ensure that no voltage is present on any cable.
6.1 Connecting requirements
1. Route the input and control cables separately from the low-voltage cables.
2. Use shielded cables to connect control cables for analog signals.
3. At the place of installation, connect the shield at one end or both ends in accordance
with the shielding concept of the plant and the cable used.
4. Suppress inductive loads such as a relay with a free-wheeling diode or RC module.
5. When connecting the current output, pay attention to the polarity and maximum
load (500 Ω).
6. If floating relay outputs are used, provide an appropriate backup fuse for these relays
at the installation location.
7. Observe the values for maximum contact load →  65.
NOTICE
The device is only suitable for fixed installation.
‣At the installation location, you must provide an all-pole disconnecting device as per
IEC 60947-1 and IEC 60947-3 in the vicinity of the power supply.
‣The disconnecting device may not disconnect a protective conductor.
6.2 Connecting the analyzer
LWARNING
Failure to comply with the instructions for protective grounding can result in injury or
death
‣Comply with the instructions for protective grounding when installing the analyzer.
‣The device is Class 1 equipment: use a separate protective ground for the mains
connection.
‣It is not permitted to disconnect the protective ground
6.2.1 Opening the housing of the electronics unit
Opening the housing of the electronics unit
1.
A0033421
 6 Electronics unit housing, securing screws on the cover
Loosen the securing screws on the cover with a PH2 Phillips head screwdriver.

CA76NA Electrical connection
Endress+Hauser 19
2. Open the cover of the electronics unit to the left.
6.2.2 Connecting the analog outputs, digital outputs and power
supply
Connecting the signal outputs
The measured value of the particular channel is available as a current signal on the analog
or digital output card. The analyzer can have up to 6 current outputs depending on the
device version.
1. Guide the cables through the cable entries at the bottom of the electronics unit.
Position and dimensions of the cable entries →  15.
2. Guide the cables through the cable glands to the electronics unit.
3. Connect the outputs as shown in the terminal connection diagram →  19.
Connecting the power supply
The analyzer is fitted with a fuse, T 1.25 A, for the 215 to 240 V AC voltage level. If
the analyzer is operated with 100 to 130 V AC, replace the fuse with the T 2.5 A fuse
supplied. The fuse is located in the cover of the electronics unit.
1. Guide the cables through the cable entries on the back of the electronics unit.
Position and dimensions of the cable entries →  15.
2. Connect with a 3-core cable to terminal strip X100 (L1/N/PE) in the electronics unit
according to terminal connection diagram →  19.
Terminal diagram without PROFIBUS
L1 N PE
COM2
NC2
NO2
NO1
COM1
NC1
X 100
A+
COM
COM
COM
COM
A+
A+
COM
COM
B+
B+
B+
X12
X15
X23
CH1
CH2
CH3
CH4
CH5
CH6
X3
X1
COM3
NC4
NO3
COM4
COM5
NC6
NO5
COM6
COM7
NC8
NO7
COM8
V+
IN2
IN1
V+
V+
IN4
IN3
V+
V+
IN6
IN5
V+
F01 X6
X9
X11
X13
X16
X17
A0033459
L1 N PE NO1 COM1 NC1 NO2 COM2 NC2 A
+
COM B
+
COM A
+
COM B
+
COM A
+
COM B
+
COM
X100
Power
supply
100 to
240 V AC,
50/60 Hz
X1
Relay 1
Alarm
X3
Relay 2
Warning
X12A
4 to 20
mA
Channel
1
X12B
4 to 20
mA
Channel
2
X15A
4 to 20
mA
Channel
3
X15B
4 to 20
mA
Channel
4
X23A
4 to 20
mA
Channel
5
X23B
4 to 20
mA
Channel
6

Electrical connection CA76NA
20 Endress+Hauser
Mains voltage
Multi-range power unit for 100 to 240 V AC
The analyzer is fitted with a fuse, T 1.25 A, for the 215
to 240 V AC voltage level. If the analyzer is operated
with 100 to 130 V AC, replace the fuse with the T 2.5 A
fuse supplied. The fuse is located in the cover of the
electronics unit.
Analog outputs
• X12: current output, channel 1 + 2
• X15: current output, channel 3 + 4
• X23: current output, channel 5 + 6
Digital outputs
• X1: relay, 1 alarm
• Open contact on error:
COM-NO
• Closed contact on error:
COM-NC
• X3: relay 2, warning
• Open contact on error:
COM-NC
• Closed contact on error:
COM-NO
Terminal diagram with PROFIBUS
L1 N PE
A+
COM
COM
B+
COM2
NC2
NO2
NO1
COM1
NC1
X 100
X12A
X23
CH1
CH2
X3
X1
F01
PROFIBUS
X5
B
A
GND
SH
X12B
X7
X8
A0041292
L1 N PE NO1 CO
M1
NC1 NO2 CO
M2
NC2 A+ CO
M
B+ CO
M
B A GND SH
X100
Power supply
100 to 240 V AC,
50/60 Hz
X1
Relay 1
Alarm
X3
Relay 2
Warning
X12A
4 to 20
mA
Channel 1
X12B
4 to 20
mA
Channel 2
PROFIBUS cable (internal)
Mains voltage
Multi-range power unit for 100 to 240 V AC
Analog outputs
X12: current output, channel 1 + 2
Digital outputs
• X1: relay 1, alarms
• Open contact on error: COM-NO
• Closed contact on error: COM-NC
• X3: relay 2, warnings
• Open contact on error: COM-NC
• Closed contact on error: COM-NO
If the CA76NA is the last device in the bus segment, the two jumpers must be set to X7
and X8 on the PROFIBUS interface card to incorporate the terminating resistors. If the
analyzer is not the last device in the bus segment, the jumpers must be removed from X7
and X8 on the PROFIBUS interface card.