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