Endress+Hauser Liquisys CUM 252 User manual

BA 174C/07/en/01.98
No. 50088699
Software version 1.0 or later
liquisys
CUM 252
Transmitter
for Turbidity and
Solids Content
Operating Instructions
Hauser + Endress
Nothing beats know-how

Please familiarise yourself with the instrument before you
take any other steps:
General information
Safety
Description
You wish to install and start up the instrument.
The required steps are described in these chapters:
Installation First start-up
You wish to operate or reconfigure the instrument.
The operating concept is explained in these chapters:
Operation
Instrument configuration
Need help with problems or maintenance?
Diagnostics
Maintenance and service
See the back cover for a fold-out overview
of the menu structure.

Table of contents
1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Symbols used ............................................2
1.2 Conformity statement ........................................2
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Intended use .............................................3
2.2 General safety notes .........................................3
2.3 Safety devices ............................................3
3 Instrument description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Areas of application .........................................4
3.2 Measuring system ..........................................4
3.3 Essential features ..........................................5
3.4 Instrument variants ..........................................6
3.5 Accessories .............................................7
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1 Storage and transport ........................................8
4.2 Unpacking ..............................................8
4.3 Mounting...............................................9
4.4 Connection ............................................ 11
4.5 Packaging and disposal ...................................... 13
5 First start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1 Operator interface ......................................... 16
6.2 Display elements .......................................... 16
6.3 Keyfunctions ........................................... 18
6.4 Operating concept ......................................... 19
6.5 Operation example ........................................ 21
6.6 Auto / manual operating mode .................................. 23
7 Instrument configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.1 Measuring point configuration .................................. 25
7.2 Limit contactor configuration , ................................... 27
7.3 Current output range selection .................................. 29
7.4 General instrument configuration ................................. 30
7.5 Calibration adaptation ...................................... 32
7.6 3-point calibration of transmitter ................................. 34
7.7 Calibration result data ....................................... 38
8 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.1 Limitalarm............................................. 40
8.2 Errors ................................................ 40
8.3 Possible faults in measuring mode and elimination ....................... 42
9 Maintenance and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.1 Cleaning.............................................. 43
9.2 Repair ............................................... 43
10 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
10.1 Technical data ........................................... 44
10.2 Index ................................................ 47
liquisys CUM 252 Table of contents
Endress+Hauser 1

1 General information
1.1 Symbols used
Warning:
This symbol alerts to hazards which may cause serious injuries as well as damage to
the instrument, measuring system or other equipment if ignored.
Caution:
This symbol alerts to possible malfunction due to operator error.
Note:
This symbol indicates important items of information.
1.2 Conformity statement
The Liquisys CUM 252 measuring transmitter has been developed and manufactured in
accordance with the applicable European standards and directives.
Note:
The corresponding certificate of conformity may
be requested from Endress+Hauser.
General information liquisys CUM 252
2 Endress+Hauser

2 Safety
2.1 Intended use
The measuring transmitter Liquisys CUM 252 is a field-tested and reliable measurement device
for determining turbidity or solids concentration. It is equipped with two current outputs and two
switched outputs for connection to automated process controllers.
2.2 General safety notes
Warning:
Operation of the device in a manner other than as described in these operating
instructions may lead to unsafe and improper functioning of the measuring system.
Installation, start-up, operation
The Liquisys CUM 252 instrument has been designed for safe operation according to the state
of the art in engineering and in keeping with the applicable regulations and EC directives; see
“Technical data”. However, if used improperly or other than for the intended purpose, it may
pose a hazard, e.g. due to improper connection.
Installation, electrical connection, start-up, operation and maintenance of the measuring system
must therefore be performed exclusively by trained specialists authorised by the system
operator. This personnel must have read and understood these operating instructions and must
adhere to them.
2.3 Safety devices
●Access code:
Unauthorised access to the calibration and configuration data of the measuring transmitter is
effectively prevented by access codes. The instrument settings can be read at any time
without entry of an access code.
●Alarm function:
Continuous violation of the limit settings, sensor failure or process-related problems will
activate an alarm. This condition is indicated by an LED on the control panel and via a
switched output. The alarm contact has been designed as a fail-safe switch, i.e. the alarm
condition will be immediately signalled in case of a power failure (requires two separate
current supply circuits). The alarm contact is also activated by internal system errors (see 8.2).
●Data protection:
The instrument configuration is retained even after a power failure.
●Immunity to interference:
This instrument is protected against interference, such as pulse-shaped transients, high
frequency and electrostatic discharges, according to the applicable European standards.
This is, however, only the case for instruments connected as outlined in these operating
instructions.
liquisys CUM 252 Safety
Endress+Hauser 3

3 Instrument description
3.1 Areas of application
The measuring transmitter Liquisys CUM 252 is an excellent choice for measuring and control
tasks in the following areas of application:
●Sewage treatment plants, solids concentration measurement
●Effluent treatment
●Water treatment and water monitoring
●Drinking water
●Surface water (rivers, lakes, dams, ocean)
●Service water
●Indirect discharge
●Water recycling
3.2 Measuring system
UM252SYS.CDR
Universal
suspension
assembly
CYH 101
Sensor
CUS 31, CUS 41
Liquisys CUM 252
2 limit contacts
1 alarm contact
Current output 1: TU
0/4 ... 20 mA
Auxiliary power
supply (15 V)
HOLD
Power (mains)
Current output 2: temp.*
0/4 ... 20 mA
Fig. 3.1 Example of a complete measuring system
* optional
Instrument description liquisys CUM 252
4 Endress+Hauser

A typical measuring system comprises:
●a CUS 31 or CUS 41 sensor with an integrated temperature sensor
●an appropriate immersion, flow or retractable assembly
●an extension cable (shielded standard cable / 2 ×2 wires, twisted pair) with junction box VBM
if necessary
●the Liquisys CUM 252 measuring transmitter
3.3 Essential features
●Field housing with protection type IP 65
●Measuring ranges 0 ... 9999 FNU, 0 ... 3000/9999 ppm, 0 ... 3/300 g/l, 0 ... 200%
(depending on sensor and sample)
●Temperature measuring range –5.0 ... + 70.0 °C
●Easy to read, two-line display
●Simple configuration with only three keys
●Configuration protected by access code
●Quick calibration using the “CAL”key
●Two switched outputs which can be configured as limit contacts
●One contact which can be configured as a spray cleaning contact
●One switched output for alarm signalling in cases of limit violation
●Two current outputs with selectable measurement range, switchable between 0 ... 20 or
4 ... 20 mA proportional (switching affects both outputs)
●Automatic “hold”function to “freeze”the current outputs and switched outputs during
calibration, configuration and cleaning
●“Hold”function can be controlled via a galvanically separated input using an external or
internal auxiliary voltage
●Interference-free communication with the sensor via digital interface
●Wiper control via digital interface
liquisys CUM 252 Instrument description
Endress+Hauser 5

3.4 Instrument variants
You can identify the device variant and the
mains supply type by the order code on the
nameplate of the instrument.
Order code
Version / measuring range
TU Turbidity / solids content measuring transmitter
in PC/ABS protection housing, 247 ×170 ×115 mm (H ×W ×D),
2-line display, protection type IP 65
Application units FNU, ppm, g/l and % or % DM
Power supply
0 Power supply: 230 V AC
1 Power supply: 115 V AC
2 Power supply: 200 V AC
3 Power supply: 24 V AC
5 Power supply: 100 V AC
8 Power supply: 24 V DC
9 Special version to customer specifications
Measurement output
0 Meas. output: turbidity / solids content (DM)
1 Meas. output: turbidity / solids content and temperature
9 Special version to customer specifications
Additional features
10 Base version
20 Moisture protection lacquering
99 Special version to customer specifications
UM252TYP.TIF
Fig. 3.2 Nameplate of Liquisys CUM 252
Instrument description liquisys CUM 252
6 Endress+Hauser

3.5 Accessories
Sensor
Type Features Areas of application
CUS 31 Scattered light sensor in all-plastic housing
with sapphire windows and perm. attached
cable, cable length optionally 7 or 15 m,
prot. type IP 68, with integrated temp. sensor
Drinking water,
surface water,
service water,
waste treatment effluent
CUS 41 Scattered light sensor in all-plastic housing
with sapphire windows and perm. attached
cable, cable length optionally 7 or 15 m,
prot. type IP 68, with integrated temp. sensor
Solids concentr. meas. in
–sewage treatment plants
–sedimentation
–water conditioning
Assemblies
Type Features Areas of application
CYH 101 Universal suspension assembly holder Installation for immersed
operation, e.g. in activated
sludge basins
CYA 611 Immersion assembly
CUA 250 Flow assembly Installation for
flow operation
CUA 461 Retractable assembly
Installation for
in-line operation, e.g.
in pipelines or
on tank walls
Cleaning system
Type Features Areas of application
Chemoclean
CYR 20
Program sequencer for automatic control of
cleaning cycles, user-definable weekly
program, hold output
For use with heavily soiled
media
Chemoclean
CYR 10
Injector with drive water and cleaning agent
valves
Chemoclean
CUR 4
Spray head for CUS 31, CUS 41 also in
conjunction with suspension or immersion
assembly CYH 101 for ½" hose connection,
material: PVC
Spray clean.
system for
CYA 611
Spray cleaning set for immersion assembly
CYA 611, D16 pressure hose bush connection
liquisys CUM 252 Instrument description
Endress+Hauser 7

4 Installation
4.1 Storage and transport
The packaging material used to store or transport the instrument must provide shock and
moisture protection. Optimal protection is provided by the original packaging materials.
Conformance with the ambient conditions (see “Technical data”) must be assured.
4.2 Unpacking
Verify that the contents are undamaged. Inform the post office or freight carrier as well as the
supplier of any damage.
Check that the delivery is complete and agrees with the shipping documents and your order:
●Quantity delivered
●Instrument type and version according to the nameplate (see chapter 3.4)
●Accessories
●Operating instructions
Included in delivery:
●1 set of plug-in screw terminals
●1×cable gland Pg 7
●1×cable gland Pg 16 reduced
●2×cable gland Pg 13.5
The cable gland openings in the housing have not been punctured. Puncture only the
openings needed and leave the cover in place when making the openings to keep the housing
as stable as possible.
The post mounting kit is not included in the delivery.
Save the original packaging in case the device must be stored or shipped at a later time.
If you have any questions, please consult your supplier or the Endress+Hauser sales office in
your area (see back cover of these operating instructions for addresses).
Installation liquisys CUM 252
8 Endress+Hauser

4.3 Mounting
Wall mounting of Liquisys CUM 252 in field housing
Post mounting of Liquisys CUM 252 in field housing (optional)
Additional requirements: post mounting kit (see Mounting accessories). Install the post mounting
kit on the rear of the instrument. Installation is possible on horizontal or vertical piping. The
maximum pipe diameter is 60 mm (see figure 4.2).
pm252wan.cdr
115
157
154
170
247
∅8
Mounting screw: ∅6mm
Anchor: ∅8mm
16
Fig. 4.1 Wall mounting of Liquisys CUM 252
pm252mas.cdr
Fig. 4.2 Post mounting of Liquisys CUM 252
liquisys CUM 252 Installation
Endress+Hauser 9

Mounting accessories
Post mounting kit
Kit for installation of field housing on horizontal or vertical pipes (max. ∅60 mm);
Material: stainless steel VA; order no. 50086842
Caution:
Weather protection cover CYY 101 (see Mounting accessories) is to be used for
outdoor installation. The protection cover is suitable for wall or post mounting.
Weather protection cover CYY 101
Weather protection cover for outdoor use of
instrument, to be installed on field housing.
Dimensions: 320 ×300 ×270 mm (H ×W×D);
Material: stainless steel
Order no.: CYY101-A
A post mounting kit is not needed when
another mounting assembly, e.g. the CYH 101
(cf. page 4), is used.
1:2
pm252mbe.cdr
90
70
70
55
∅8
30
90
∅6
90 70
∅8
M6
Fig. 4.3 Post mounting kit
yh-101-6.cdr
320
300
270
Fig. 4.4 Weather protection cover CYY 101
Installation liquisys CUM 252
10 Endress+Hauser

4.4 Connection
Warning:
●The connection to the mains may only be established by properly trained specialist
personnel.
●Do not perform service work on the instrument while the instrument is energised.
●The instrument must be grounded before start-up!
●A clearly identified mains disconnecting device must be installed close to the
instrument.
●Before connecting the instrument to the mains, make sure the mains voltage
matches the voltage rating on the nameplate.
Instrument connections
um252anr.cdr
Fig. 4.5 Position and designation of connections in wiring compartment; top: wiring comp.; left: instrument
with one current output; right: instrument with two current outputs; connection for 220 V AC
liquisys CUM 252 Installation
Endress+Hauser 11

Connection diagram
Caution:
Do not connect the two signal outputs with each other! If you want to connect them
both to a PLC with common ground of all inputs, then you must anew isolate one
output galvanically.
15 V
86
85
97
88
87
49
48
47
59
58
57
43
42
41
L
N
L+
L-
~=
96
S
S
S
81
82
mA
32
31 TU
mA
34
33
gn
wt
bn
10-50 V
ye
UM252A3E.CDR
Sensor CUS 31
CUS 41
*) Contact
status
shown:
no current,
fault present
Hold input
Signal output 1: TU Power supply
Relay 1
Relay 2
Alarm *)
Liquisys CUM 252
Auxiliary supply voltage
(usable for hold input)
Signal output 2: temp.*)
*) optional
Fig. 4.6 Electrical connection of Liquisys CUM 252
Installation liquisys CUM 252
12 Endress+Hauser

Connection of sensor CUS 31 or CUS 41
The sensor is connected via the multi-core measuring cable attached to the sensor. Should it
become necessary to extend the measuring cable, use junction box VBM and a shielded twisted
pair cable with 2 ×2 wires.
Warning:
Connectors and terminals must be protected against humidity, otherwise faulty
measurements will result!
Connection accessories
Junction box VBM
Junction box for measuring cable extension with 10 high-impedance terminals and Pg 13.5
cable glands for cable entry. Material: painted aluminium; protection type: IP 65
Order no.: 50003987
Extension cable
2×2-wire shielded twisted pair cable
4.5 Packaging and disposal
Packaging
Packaging must provide shock and moisture protection. Optimal protection is provided by the
original packaging materials.
Disposal
Note:
Electronic components to be disposed of are considered special waste!
Please observe local regulations for disposal!
US3141KA.CDR
Terminal:
gn
bn
wt
Assignment:
ye
S
96
97
88
87
Outer screen
Com A
Com B
–UB
+ UB
Fig. 4.7 Permanently attached sensor cable on CUS 31, CUS 41
liquisys CUM 252 Installation
Endress+Hauser 13

5 First start-up
Connect a type CUS 31 or CUS 41 sensor to the CUM 252 transmitter. After power-up, the
measuring chain is ready to measure turbidity (in FNU units) without requiring calibration. If you
intend to measure the solids concentration in ppm, g/l or %, you should select the measured
quantity/unit and the calibration data set after power-up (see chapters 7.1 and 7.4), and then
calibrate the sensor if necessary (see chapter 7.6).
Note:
Familiarise yourself with the operation of the measuring instrument before switching it
on for the first time!
Caution:
Before power-up, check that all connections have been properly made!
Warning:
Before power-up make sure that there is no risk of damage to the system the
instrument is a part of; for example, due to valves or pumps that might operate in an
uncontrolled manner, etc.
Power-up, test
After power-up, the instrument performs a
self-test and then starts up in the measuring
mode.
If the display is similar to figure 5.1, the
instrument is functioning properly.
The measured values shown on the display
may be different.
In order to check the alarm function as well as any connected alarm signalling device, the
current supply can be interrupted for a moment. All configuration data will be retained.
The relays can be operated manually for function checks, maintenance work, etc.
See chapter 6.6, Auto / manual mode of operation.
Fig. 5.1 Display after power-up and completion of
self-test
First start-up liquisys CUM 252
14 Endress+Hauser

Factory settings
The following factory settings are active when the instrument is powered up for the first time:
Type of measurement Turbidity measurement in FNU
Temperature offset /
turbidity offset
0 °C
0 FNU
Limit 1 0 FNU
Contact function, limit contactor 1 MIN contact without delay
(switches when value drops below limit 1)
Limit 2 9999 FNU (upper range value, depending on sensor
and unit selected)
Contact function, limit contactor 2 MAX contact without delay
(switches when limit 2 is exceeded)
Current outputs 1 and 2 4 ... 20 mA
Current output 1: TU value
for 4 mA signal current 0 FNU
Current output 1: TU value
for 20 mA signal current
9999 FNU (upper range value, depending on sensor
and unit selected)
Current output 2: temp. value
for 4 mA signal current* 0 °C
Current output 2: temp. value
for 20 mA signal current* 40 °C
Filter time constant / filter strength 10 s
Calibration data set No. 3
Wiper control Off (“oFF”)
* On instruments with two current outputs
liquisys CUM 252 First start-up
Endress+Hauser 15

6 Operation
6.1 Operator interface
6.2 Display elements
LED indicators
Indication for relay controlled in “manual”mode (red LED).
Indication for “auto”(green LED) or “manual”(yellow LED) mode.
Indicates the status of relays 1 and 2.
LED green: measured value is within permissible limits, relay is inactive.
LED red: measured value is outside of permissible limits, relay is active.
Alarm indication for continuous limit violation, sensor / process alarm, sensor error,
AD converter overflow or system error.
Liquid crystal display
for display of
measured values and
configuration data
4 main control keys for
calibration and instrument
configuration
Key for displaying
limits and switching
relays or wiper
selection in manual
mode
LED indicator for
alarm function
LED indicators
for switched limit
outputs
um221-01.cdr
Key for switching
between automatic /
manual operation
Fig. 6.1 Operating elements of Liquisys CUM 252
Operation liquisys CUM 252
16 Endress+Hauser

Liquid crystal display
Indicator for “hold”
mode (outputs
reflect last current
status)
“Process medium”symbol:
Flashes in case of sensor or
process alarm together with
sensor symbol
Sensor symbol:
Flashes in case of
calibration error or
sensor alarm
In measuring mode:
temperature
In setup / calibr. mode:
e.g. parameter setting
“Error”
indicator
Setup mode
indicator
(configuration)
Measuring mode
indicator (normal
operation)
Calibration mode
indicator
In measuring mode:
main measurement
value
In setup / calibr. mode:
e.g. parameter
ANZ000UM.CDR
Active wiper
indicator
“ATC”:
Flashes in case of
temperature error
Fig. 6.2 Liquid crystal display of Liquisys CUM 252
In measuring mode:
quantity measured
In setup mode:
parameter adjusted
liquisys CUM 252 Operation
Endress+Hauser 17

6.3 Key functions
Quick calibration
Press the CAL key and enter the access code for quick calibration (11) to directly
access the calibration mode.
Setup
After pressing the E key and entering the setup code (22), the instrument switches to
the setup mode. The E key is further used for:
●selecting the individual functions in setup mode
●saving the data entered in setup mode
●starting calibration
In measuring mode: Relay / wiper operation in “manual”mode.
In setup mode: Function group selection, setting of parameters and numerical values
(the setting speed increases when the key is held down).
Note:
Press both keys simultaneously to jump back
to the measuring mode.
Displays the limits set for the relays in “auto”mode,
switches between relay 1, relay 2 and wiper in “manual”mode.
Toggles the relays and the wiper between the “auto”and “manual”modes.
Operation liquisys CUM 252
18 Endress+Hauser