Endress+Hauser Turbimax CUE21 User manual

BA395C/07/en/03.07
71001158
Operating Instructions
Turbimax CUE21 / CUE22
Turbidimeter for on-line measurement
OUT
IN
OUT
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Turbimax CUE21

Endress+Hauser
Brief operating instructions
This explains how to use these Operating Instructions to commission your turbidimeter quickly and
safely:
Safety instructions
→Page 4 ff.
→Page 5
General safety instructions and explanations of the safety icons are provided in the section in
question.
Specific safety instructions are provided at the appropriate position. Their level of importance can
be seen from the icon: #Warning, "Caution, !Note.
Æ
Installation
→Page 9
→Page 10 ff.
The installation conditions, such as the dimensions of the device, are illustrated here.
Here, you can find all important steps for installing and plumbing the device.
Æ
Wiring
→Page 14 ff. Here, you can find the wiring diagrams and steps needed for the electrical connection of the
device.
Æ
Display and operating elements
→Page 16 ff. Use this section to familiarize yourself with the operation of the device.
Æ
Configuration
→Page 18 ff. Here, you can find all the important steps for configuring your measuring point.
Æ
Calibration
→Page 24 ff. This section explains all necessary steps to calibrate the instrument.
Æ
Maintenance
→Page 28 ff. Here, you can find information on important maintenance activities, for example, cleaning the
flow-through cuvette and replacing the desiccant pouch.
Æ
Accessories
→Page 30 ff. Here, you can find an overview of the accessories which can be supplied.
Æ
Troubleshooting
→Page 32 ff.
→Page 33
If faults occur during operation, use the check lists to localize and remedy them.
A list of available spare parts.
Æ
Technical data
→Page 36
→Page 35 ff.
Dimensions
Ambient and process conditions, weight, materials etc.

Turbimax CUE21 / CUE22
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Table of contents
1 Safety instructions . . . . . . . . . . . . . . . . 4
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Installation, commissioning and operation . . . . . . . . 4
1.3 Operational safety . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Notes on safety icons and symbols . . . . . . . . . . . . . . 5
2 Identification . . . . . . . . . . . . . . . . . . . . 6
2.1 Device designation . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Certificates and approvals . . . . . . . . . . . . . . . . . . . . 7
3 Installation . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Quick installation guide . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Incoming acceptance, transport, storage . . . . . . . . . . 9
3.3 Installation conditions . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Installation instructions . . . . . . . . . . . . . . . . . . . . . 10
3.5 Post-installation check . . . . . . . . . . . . . . . . . . . . . . 13
4 Wiring . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Electrical connection . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Post-connection check . . . . . . . . . . . . . . . . . . . . . . 15
5 Operation . . . . . . . . . . . . . . . . . . . . . . 16
5.1 Display and operating elements . . . . . . . . . . . . . . . 16
5.2 Key assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3 Access code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4 Menu structure . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 Commissioning. . . . . . . . . . . . . . . . . . 18
6.1 Function check . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2 Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.3 Instrument configuration . . . . . . . . . . . . . . . . . . . . 18
6.4 Instrument calibration . . . . . . . . . . . . . . . . . . . . . . 24
7 Maintenance. . . . . . . . . . . . . . . . . . . . 28
7.1 Cleaning the flow through cuvette . . . . . . . . . . . . . 28
7.2 Replacing the desiccant pouch . . . . . . . . . . . . . . . . 28
7.3 Replacing the lamp . . . . . . . . . . . . . . . . . . . . . . . . 29
8 Accessories. . . . . . . . . . . . . . . . . . . . . 30
8.1 Calibration solutions . . . . . . . . . . . . . . . . . . . . . . . 30
8.2 Flow chamber CUE21 / CUE22 . . . . . . . . . . . . . . 30
9 Troubleshooting . . . . . . . . . . . . . . . . . 32
9.1 Troubleshooting instructions . . . . . . . . . . . . . . . . . 32
9.2 System error messages . . . . . . . . . . . . . . . . . . . . . . 32
9.3 Process errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9.4 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9.5 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
9.6 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10 Technical data . . . . . . . . . . . . . . . . . . . 35
10.1 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.2 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.3 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.4 Performance characteristics . . . . . . . . . . . . . . . . . . 35
10.5 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.6 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
10.7 Mechanical construction . . . . . . . . . . . . . . . . . . . . 36
Index . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Safety instructions Turbimax CUE21 / CUE22
4Endress+Hauser
1 Safety instructions
1.1 Designated use
The Turbimax CUE21 / CUE22 process turbidimeters have been designed for on-line measurement
of the turbidity of process water and drinking water. The infrared light instrument, CUE21, meets
the design criteria on turbidity measurement specified in ISO 7027 and DIN 27027. The white light
instrument, CUE22, meets the design criteria specified by US EPA 180.1.
Any other use than the one described here compromises the safety of persons and the entire
measuring system and is, therefore, not permitted.
The manufacturer is not liable for damage caused by improper or non-designated use.
1.2 Installation, commissioning and operation
Please note the following items:
• Installation, commissioning, operation and maintenance of the measuring system must only be
carried out by trained technical personnel.
The technical personnel must be authorized for the specified activities by the system operator.
• Electrical connection must only be carried out by a certified electrician.
• Technical personnel must have read and understood these Operating Instructions and must
adhere to them.
• Before commissioning the entire measuring point, check all the connections for
correctness. Ensure that electrical cables and hose connections are not damaged.
• Do not operate damaged products and secure them against unintentional
commissioning. Mark the damaged product as being defective.
• Measuring point faults may only be rectified by authorized and specially trained
personnel.
• If faults can not be rectified, the products must be taken out of service and secured against
unintentional commissioning.
• Repairs not described in these Operating Instructions may only be carried out at the
manufacturer’s or by the service organization.
1.3 Operational safety
The measuring system has been designed and tested to the highest standards and left the factory in
perfect functioning order.
Relevant regulations and European standards have been met.
As the user, you are responsible for complying with the following safety conditions:
• Installation instructions
• Local prevailing standards and regulations.
Immunity to interference
This instrument has been tested for electromagnetic compatibility in industrial use according to
applicable European standards.
Protection against interference as specified above is valid only for an instrument
connected according to the instructions in these Operating Instructions.
1.4 Return
If the device requires repair, please send it cleaned to the sales centre responsible. Please use the
original packaging, if possible.
Please enclose the completed "Declaration of contamination" (copy the second last page of these
Operating Instructions) with the packaging and the transportation documents.
No repair without completed "Declaration of contamination"!

Turbimax CUE21 / CUE22 Safety instructions
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1.5 Notes on safety icons and symbols
Safety icons
Electrical symbols
#Warning!
This symbol alerts you to hazards. They can cause serious damage to the instrument or to persons
if ignored.
"Caution!
This symbol alerts you to possible faults which could arise from incorrect operation. They could
cause damage to the instrument if ignored.
!Note!
This symbol indicates important items of information.
%Direct Current (DC)
A terminal at which DC is applied or through which DC flows.
&Alternating Current (AC)
A terminal at which (sine-form) AC is applied or through which AC flows.
)Ground connecting
A terminal, which, from the user’s point of view, is already grounded using a grounding system.
*Protective ground terminal
A terminal which must be grounded before other connections may be set up.
bAlarm relay
Input
Output
DC voltage source
Temperature sensor

Identification Turbimax CUE21 / CUE22
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2 Identification
2.1 Device designation
2.1.1 Nameplate
Compare the order number on the nameplate with your order.
The device version can be identified from this order number.
a0003781
Fig. 1: CUE21 nameplate (example)
2.1.2 Ordering information
Turbimax CUE21, compact device, infrared
Turbimax CUE22, compact device, white light
Turbimax CUE21
Rating:
Order code:
Serial no.:
CUE21-A1A
xxx
100-240 V AC
47-63 Hz
80 VA
139072-0000
Power supply
A 100 to 240 VAC
Output
1 4 to 20 mA or RS-485
Version
AStandard
CUE21- complete order code
Power supply
A 100 to 240 VAC
Output
1 4 to 20 mA or RS-485
Version
AStandard
CUE22- complete order code

Turbimax CUE21 / CUE22 Identification
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2.2 Scope of delivery
The scope of delivery comprises:
• 1 Turbimax CUE21 / CUE22 turbidimeter
•1Fieldterminalbox
• 1 Flow through assembly
• 1 Desiccant pack
• 1 Cuvette (single pack)
• 1 Tubing kit including
–1shutoffclamp
– 1 backpressure valve
– 2 connecting tubes with fittings for flow through assembly
– 1 drain vent screw (used in pressurized systems)
• 1 Operating Instructions BA395C/07/en
If you have any questions, please contact your supplier or your sales centre responsible .
2.3 Certificates and approvals
Declaration of conformity
The product meets the requirements of the harmonized European standards. It thus complies with
the legal requirements of the EC directives.
The manufacturer confirms successful testing of the product by affixing the 4symbol.

Installation Turbimax CUE21 / CUE22
8Endress+Hauser
3 Installation
3.1 Quick installation guide
Proceed as follows to completely install the measuring point:
• Mount the instrument (see "Installation instructions" section).
• Plumb the instrument as shown in the "Plumbing" section
• Connect the instrument as illustrated in the "Electrical connection" section.
• Commission the instrument as explained in the "Commissioning" section.
3.1.1 Measuring system
The Turbimax CUE21 / CUE22 measuring system comprises:
• Turbimax turbidimeter with installed cuvette and desiccant pouch
• Connecting tubing with
– fittings for flow through assembly
–shutoffclamp
– backpressure valve
– drain vent screw (in pressurized systems)
• Sensor interconnect cable
a0003460
Fig. 2: Turbimax CUE21 system (example)
1
2
3
4
Shutoff clamp
Intake tubing connection (for OD 8 mm (0.31"),
ID 4.75 mm (0.19") tubing)
Flowhead
Backpressure valve
5
6
7
8
Sensor interconnect cable
Drain vent
Drain tubing connection (for OD 8 mm (0.31"),
ID 4.75 mm (0.19") tubing)
Field terminal box
1
2
4
5
6
7
8
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Turbimax CUE21
3

Turbimax CUE21 / CUE22 Installation
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3.2 Incoming acceptance, transport, storage
• Make sure the packaging is undamaged!
Inform the supplier about damage to the packaging. Keep the damaged packaging until the matter
has been settled.
• Make sure the contents are undamaged!
Inform the supplier about damage to the delivery contents. Keep the damaged products until the
matter has been settled.
• Check that the scope of delivery is complete and agrees with your order and the shipping
documents.
• The packaging material used to store or to transport the product must provide shock protection
and humidity protection. The original packaging offers the best protection. Also, keep to the
approved ambient conditions (see "Technical data").
• If you have any questions, please contact your supplier or your sales center responsible.
3.3 Installation conditions
a0003468
Fig. 3: Mounting dimensions front view
a0003469
Fig. 4: Mounting dimensions lateral view
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Turbimax CUE21
200 (8)
M6 (¼ inch)
207.65
(8.175)
90.17 (35)
50.8 (2.0)
M4
(3/16 inch)
30.17
(1.188)
147.66 (5.813)
87.33 (3.438)
mm (inch)
131.6 (5.164)
347.16 (13.668)
196.85 (7.75)
61.77
(2.432)
mm (inch)

Installation Turbimax CUE21 / CUE22
10 Endress+Hauser
3.4 Installation instructions
3.4.1 Mounting the instrument
Turbimax CUE21 / CUE22 is designed for wall mounting. If wall mounting is not practical, the
instrument can be mounted on any suitable level surface.
!Note!
• Check that the temperature does not exceed the maximum permitted operating temperature
range (0 to 50 °C (32 to 122 °F)).
• Leave a free area of approx. 0.20 m (8.00") above the instrument. This will ensure enough room
for calibration and cuvette maintenance.
• Mount the instrument as close as possible to the sampling point to ensure a quick response time
(within 2 to 3 m (6 to 10 ft)).
To mount the instrument proceed as follows:
1. Drill mounting holes for M4 (3/16") mounting screws to install the field terminal box. See the
"Installation conditions" section to establish mounting hole locations.
2. Drill mounting holes for M6 (¼") mounting screws to install the instrument enclosure on top
of the field terminal box. See the "Installation conditions" section to establish mounting hole
locations.
3. Mount the field terminal box.
4. Mount the rest of the instrument on top of the field terminal box.
3.4.2 Installing the desiccant pouch
Turbimax CUE21 / CUE22 is equipped with a continuous vapor purge system. A replaceable
desiccant pouch in the lower portion of the instrument dries the air. System heat is used to warm
the air. A fan inside the instrument continuously circulates heated air around the optical well and
the flow through cuvette.
To install the desiccant pouch, proceed as follows:
!Note!
To prevent premature saturation of the desiccant, it is recommended to keep the measurement
chamber covered at any time.
a0003917
Fig. 5: Desiccant installation
1. Unscrew the four corner thumbscrews
(pos.1).
2. Remove the electronics half of the
instrument (pos. 2).
3. Open the bag protecting the desiccant pouch
(pos. 4) and install it with the humidity
indicator (pos. 3) in the instrument base
(pos. 5).
!Note!
Once the bag is opened, install the desiccant
pouch immediately to prevent premature
degradation of the desiccant.
4. Replace the electronics half of the
instrument in its location.
5. Tighten the four corner thumbscrews again.
3
4
5
1
2
1

Turbimax CUE21 / CUE22 Installation
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3.4.3 Installing the cuvette
"Caution!
The ultrasonic cuvette must be completely dry before it is inserted into the sensor. If there is any
visible moisture present on the cuvette or transducer, there is great risk of damaging the sensor
electronics and the transducer.
To install the cuvette proceed as follows:
a0003919
Fig. 6: Cuvette installation
1. Check that the cuvette is clean and free of
scratches or marks.
2. Remove the flow head of Turbimax
CUE21 / CUE22 (pos 1).
3. Carefully screw the cuvette (pos. 2) into the
flow head making sure not to leave finger
prints on the cuvette.
4. Insert the cuvette with the flow head in the
instrument and lock the flow head.
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2

Installation Turbimax CUE21 / CUE22
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3.4.4 Plumbing
!Note!
• The instrument requires a very low head pressure to operate, approx. 0.069 bar (1 psi.)
• The pressure regulator is rated for a max. pressure of 13.8 bar (200 psi)
• The minimum flow rate for the flow through cuvette is 100 ml/min to 1 l/min
(0.026 to 0.26 gal/min).
• The maximum allowable fluid temperature is 50 °C (122 °F).
The instrument is equipped to be plumbed using 4.75 mm (3/16") ID, 8 mm (5/16") OD flexible
tubing. Opaque tubing should be used if the instrument will be exposed to sunlight, to prevent algae
growth.
Proceed as follows:
1. Push the shutoff clamp (pos. 2) over one of the supplied tubes.
2. Connect the tube to the upper part of the intake tubing connection (pos. 3) and to the
connection on top of the instrument (pos. 1).
3. Push the backpressure valve (pos. 6) over the second supplied tube.
4. Connect the tube to the upper part of the drain tubing connection (pos. 7) and the connection
on top of the instrument (pos. 5).
5. Connect a 4.75 mm (3/16") ID tube to the lower part of the intake tubing connection (pos. 4)
to supply the sensor with a dependable sample flow.
6. Connect a 4.75 mm (3/16") ID tube to the lower part of the drain tubing connection (pos. 9)
to route the sensor drain to a suitable site drain.
The drain vent (pos. 8) allows for atmospheric equalization, thus helping to alleviate bubble
formation in the cuvette.
If your CUE21 / CUE22 is integrated in a high-pressure system, insert the supplied 6:32 seal
screw into the vent hole and tighten it.
a0003614
Fig. 7: Recommended plumbing
1
2
3
4
5
6
Connection for intake tube
Shutoff clamp
Connection for intake tube
Connection for intake tube
Connection for drain tube
Backpressure valve
7
8
9
10
11
12
Connection for drain tube
Drain vent
Connection for drain tube
Insert
Nut
Tubing (not supplied)
2
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Turbimax CUE71
4
6
8
9
Detail A
10
11
12
Detail A
OUT
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OUT
1
3
5
7

Turbimax CUE21 / CUE22 Installation
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3.5 Post-installation check
• After installation, check the instrument for damage.
• Make sure that all connections are fitted tightly and are leakage resistant.
• Ensure that the tubing cannot be removed without effort.
• Check all tubes for damage.

Wiring Turbimax CUE21 / CUE22
14 Endress+Hauser
4 Wiring
4.1 Electrical connection
#Warning!
• The electrical connection must only be carried out by authorised technical personnel.
• Technical personnel must have read and understood the instructions in this manual and must
adhere to them.
• Ensure that there is no voltage at the power cable before beginning the connection work.
4.1.1 Position of the terminals
#Warning!
• The instrument is equipped with a 100 to 240 V AC, 47 to 63 Hz switching power supply. Before
connection, ensure that the line voltage falls within these specifications.
• Place a circuit breaker prior to the power connection to allow for service.
a0003464
Fig. 8: Field terminal box
1
2
3
4
Power supply terminal block
Power cable strain relief
Power cable gland
Alarms terminal block, 240 VA, 2A
5
6
7
8
4 to 20 mA / RS485 terminal block
Sensor wiring
4 to 20 mA / RS485 cable gland
Alarm cable gland

Turbimax CUE21 / CUE22 Wiring
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4.1.2 Connecting the RS-485 cable
The RS-485 half-duplex (2-wire) digital interface operates with differential levels that are not
susceptible to electrical interferences. This is why cable lengths up to 914 m / 3000 ft can be
implemented. The last device on each bus may require terminating with a 120-ohm resistor to
eliminate signal reflection on the line. Do not run RS-485 cables in the same conduit as power.
4.1.3 Connecting the relays
The Alarm 1 and Alarm 2 relays are mechanical relays rated at 240 V AC 2A. Please note that the
relays are labeled NO (Normally Open), NC (Normally Closed), and C (Common). As these alarms
are configured fail-safe, the normal condition is with power applied to the Turbimax and in a
non-alarm condition. Operation of these alarms is covered in section "Configuring the alarms".
4.1.4 Connecting the 4 ... 20 mA output
The 4 ... 20 mA output is driven by a 15 V DC power source and can drive recorder loads up to
600 ohms. This output is isolated from line power and earth ground. Do not run 4 ... 20 mA cables
in the same conduit as power. Operation of this output is covered in section "Selecting the output".
4.2 Post-connection check
After the electrical connection, carry out the following checks:
Device condition and specifications Notes
Are the transmitter and cables damaged on the outside? Visual inspection
Electrical connection Notes
Are the mounted cables strain relieved?
Cable run without loops and cross-overs?
Are the signal lines correctly connected in accordance with the wiring
diagram?
Are all screw terminals tightened?
Are all cable entries installed, tightened and sealed?

Operation Turbimax CUE21 / CUE22
16 Endress+Hauser
5Operation
5.1 Display and operating elements
a0003471
Fig. 9: Display and operating elements
1 Display of turbidity levels and user guidance in configuration
2 Mode arrow to indicate instrument operating mode; AUTO (measurement), CAL (calibration), CONFIG
(configuration)
3 Display of error messages and user guidance
4 MODE/EXIT key used to cycle between the three instrument operating modes
5 Icon indicating the use of access code
6 Icon indicating OFFSET mode
7Fkey to confirm an option or mode that is highlighted or chosen
8VWkeys used to change settings
5.2 Key assignment
MODE
EXIT
E
47
5
AUTO
CAL
CONFIG
Å
00000..:.
0000 OFFSET
1
2
8
6
3
Cycle between the operating modes of the instrument: CAL, CONFIG
and AUTO (measurement).
FConfirm the option or mode that is highlighted or chosen.
VScroll up the menu.
Increase numerical values.
WScroll down the menu.
Reduce numerical values.
MODE
EXIT

Turbimax CUE21 / CUE22 Operation
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5.3 Access code
The instrument is equipped with a security access code feature to protect it from unintended or
undesired changes in the configuration and calibration data. The access code can be enabled in the
configuration mode. If the access security features is enabled, the code 333 must be entered to
access CAL or CONFIG menus. This code may not be changed.
The screen shown in the figure below will appear when the MODE/EXIT key is pressed.
5.4 Menu structure
The instrument has three operating modes that can be selected by the MODE/EXIT key:
• AUTO: standard mode of operation displaying current measured values
• CAL: mode to perform calibration procedures
• CONFIG: setup mode to configure customer-specific settings
Configuration menu
The configuration menu is split into sub-menus to facilitate configuration. The following sub-menus
are available:
• Output selection
• RS-485 port configuration
• Alarm configuration
• Security access configuration
• Offset configuration
• Extended settings
The extended settings are grouped together to prevent them from being modified by accident:
– Speed of response
– Displayed resolution
– LCD backlight brightness
– Displayed units
– Ultrasonic cleaning
– RS-485 parameters
– Desiccant alarm
For a detailed explanation of the sub-menus, see the chapter "Instrument configuration".
a0003619
Fig. 10: Enabling security access code
AUTO
CAL
CONFIG
000
CODE

Commissioning Turbimax CUE21 / CUE22
18 Endress+Hauser
6 Commissioning
6.1 Function check
#Warning!
• Check all connections for correctness.
Especially check that all tube connections are firmly attached and no leakages occur.
• Make sure that the supply voltage falls within the range of 100 ... 240 V AC!
6.2 Switching on
1. Familiarize yourself with the operation of the transmitter prior to switching on the device. For
this purpose, read sections 1 "Safety instructions" and 5 "Operation" in particular.
2. Apply power to the instrument and allow the unit to warm up (typically 45 ... 60 minutes on
intial commissioning).
3. When a continuous process stream is flowing through the instrument, it will display the
measured turbidity level of the sample on the LCD screen. In addition, the equivalent signal is
provided on the analog (4 ... 20 mA) output, or the digital output, depending on the options
selected.
4. Configure the instrument according to your needs.
6.3 Instrument configuration
6.3.1 Selecting the output
Function Selection Info
Output (O/P) Selection
•4-20
•485
•OFF
4-20
4 mA value 0 to 1000 NTU Set the lower (LOLM) turbidity limit
corresponding to the 4 mA output level.
20 mA value 0 to 1000 NTU Set the upper (UPLM) turbidity limit
corresponding to the 20 mA output level.
485
Baud 1200, 2400, 4800,
9600, 19200
Set the correct baud rate for operation of the
I/O port.
Addr 1 to 255 Select the desired instrument address.
MBUS ASCII
RTU
Select ASCII or RTU.
AUTO
CAL
CONFIG
4-20
O/P
Å

Turbimax CUE21 / CUE22 Commissioning
Endress+Hauser 19
6.3.2 Configuring the alarms
The system provides two relays that are designed to operate as two independent programmable
alarms. Three types of information must be input to fully program each alarm:
• Alarm function (HI, LO or OFF)
• Alarm set point (level at which alarm activates)
• Alarm delay time (the time that the set point must be exceeded prior to alarm activation and the
time before resetting the alarm)
Alarm function
The alarms can either be turned OFF or programmed to operate in one of the following manners:
•HIalarm
The relay changes state when the turbidity level is higher than the programmed alarm level for a
given period of time.
•LOalarm
The relay changes state when the turbidity level is lower than the programmed alarm level for a
given period of time.
!Note!
The relays automatically change state when an internal system failure is detected.
Alarm set point
The turbidity level at which an alarm activates is called the alarm set point. The set point is
adjustable to any valid turbidity level over the range of the instrument in steps of 0.01 NTU.
Alarm delay time
The alarm delay times are used to prevent ringing of the alarm when the turbidity level is close to
the set point. The function of the delay times is as follows:
•Delayon
The turbidity level must exceed the alarm set point continuously for at least this number of
seconds before the alarm activates.
If the delay on time is set to 5 seconds and the process turbidity exceeds the set point for only
4 seconds, the alarm will not be activated. If, however, process turbidity exceeds the set point for
5 seconds or more, the instrument will activate the alarm.
•Delayoff
The turbidity level must not exceed the alarm set point continuously for at least this number of
seconds before the alarm deactivates.
If the delay off time is set to 5 seconds and the process has exited out of the alarm condition, the
alarm will be reset only if the process is out of the alarm condition for a continuous 5 seconds.
Otherwise the system will still signal an alarm condition.

Commissioning Turbimax CUE21 / CUE22
20 Endress+Hauser
Alarm menu
6.3.3 Enabling security access
6.3.4 Extended settings
Function Selection Info
Alarm 1 (ALM1) Selection
•HI
•LO
•OFF
Set point (S/P) 0 to 1000 NTU Set the desired alarm level.
Delay on (DLYÅ) 1 to 30 s Set the desired number of seconds for the
delay on time.
Delay off (DLYÆ) 1 to 30 s Set the desired number of seconds for the
delay off time.
Alarm 2 (ALM2) Selection
•HI
•LO
•OFF
Set point (S/P) 0 to 1000 NTU Set the desired alarm level.
Delay on (DLYÅ) 1 to 30 s Select the desired number of seconds for the
delay on time.
Delay off (DLYÆ) 1 to 30 s Select the desired number of seconds for the
delay off time.
Function Selection Info
Access code (CODE) Selection
•On
•Off
If the security access is turned on, you are
required to input the access code to get to any
other mode than AUTO.
The only valid code is 333. This code may not
be changed.
Function Selection Info
Extended settings (EXTD) Selection
•On
•Off
Turn extended settings on to gain access to
configuration of the following options:
• Response speed
• Displayed resolution
• LCD backlight brightness
•Units
• Ultrasonic cleaning
• RS-485 parameters
• Desiccant alarm
AUTO
CAL
CONFIG
HI
ALM1
Å
AUTO
CAL
CONFIG
On
Å
CODE
AUTO
CAL
CONFIG
On
Å
EXTD