Endress+Hauser CLD18 Specifications
TI01080C/07/EN/05.19
71454912
2019-10-31
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Technical Information
Smartec CLD18
Compact inductive conductivity measurement for the food
and beverage industry
Application
Compact measuring system for inductive conductivity
measurement in liquids with medium to high conductivity. The
structure is made from highly durable, food-safe
polyetheretherketone (PEEK). The excellent chemical
resistance properties of the sensor mean it can also be used in
applications outside the food industry. The measuring system
is perfectly suited for:
• Phase separation of product/water mixtures in the beverage
industry
• Control of cleaning-in-place facilities (CIP), concentration
control, separation in the cleaning return line
• Industrial water monitoring
• Rinsing processes in pickling plants
Your benefits
• Hygienic sensor design in accordance with EHEDG and 3-A
requirements, no risk of recontamination
• Stainless steel or plastic transmitter housing, IP 69K, can be
cleaned with high-pressure steam
• High level of repeatability, 0.5 % of reading, always
guarantees same separation or monitoring
Function and system design
1
5
4
3
2
Smartec CLD18
Measuring principle
Inductive conductivity measurement
An oscillator (1) generates an alternating magnetic field in the primary coil (2), which induces a
current flow (3) in the medium. The strength of the current depends on the conductivity and thus on
the ion concentration in the medium. The current flow in the medium, in turn, generates a magnetic
field in the secondary coil (4). The resulting induced current is measured by the receiver (5) and used
to determine the conductivity.
Measured variables
Measuring range
1 Inductive conductivity measurement
1 Oscillator
2 Primary coil
3 Current flow in the medium
4 Secondary coil
5 Receiver
Advantages of inductive conductivity measurement:
• No electrodes and therefore no polarization effects
• Accurate measurement in media with a high degree of pollution and a tendency to form buildup
• Complete galvanic isolation of the measurement and the medium
Input
Conductivity
Temperature
Conductivity:
Temperature: –10 to 130 °C (14 to 266 °F)
Recommended range: 200 μS/cm to 1000 mS/cm
(uncompensated)
A0004894
Binary input
The binary input is used for measuring range switching.
Voltage range
Voltage High Min. 12 V
Voltage Low max. 9.0 V
0 V to 30 V
2 Endress+Hauser
Smartec CLD18
Lf
mA
mA
X
I ut1O
I ut2O
L
MRS
Alarm Out
Current consumption at 24 V 30 mA
Undefined voltage range 9.0 to 12 V
Output
Output signal
Load
Characteristic
Signal resolution
Alarm output
Electrical connection
Conductivity: 0 / 4 to 20 mA, galvanically isolated
Temperature: 0 / 4 to 20 mA, galvanically isolated
Max. 500 Ω
Linear
Resolution:
Accuracy: ± 20 μA
The alarm output is implemented as an "open collector".
Max. current
Max. voltage 30 V DC
Error or device without supply voltage Alarm output blocked (0 mA)
No error Alarm output open (up to 200 mA)
> 13 bit
200 mA
Power supply
2 Electrical connection
A0033106
Endress+Hauser 3
Terminal assignment
-
+
L
L
L+
L-
Out+
Out-
MRS+
MRS-
I ut1-O
I ut2+O
I ut1+O
I ut2-O
X
1
2
Smartec CLD18
Supply voltage
Power consumption
Cable specification
Overvoltage protection
3 Terminal assignment
IOut1
Current output conductivity (active)
IOut2 Current output temperature (active)
Out Alarm output (open-collector)
MRS Binary input (measuring range switch)
L+/L- Power supply
X Grounding pin (flat male tab 4.8 mm)
1 Cover on electronics box
2 Electronics box
24 V DC ± 20 %, protected against reverse polarity
3 W
Recommendation
max. 1.0 mm
0.5 mm
2
2
Overvoltage category I
A0029684
Performance characteristics
Response time
Maximum measured error
Conductivity:
Temperature: t90 < 20 s
Conductivity:
Temperature: ± 1.5 K
Signal outputs ± 50 μA
Repeatability
Cell constant
4 Endress+Hauser
Conductivity:
11.0 cm
-1
t95 < 1.5 s
± (2.0 % of measured value + 20 µS/cm)
max. 0.5 % of measured value ± 5 µS/cm ± 2 digits
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