Endress+Hauser CM14 Specifications
Technical Information
Liquiline CM14
4-wire-controller based on digital Memosens technology for
pH/ORP, conductivity and oxygen
Application
Liquiline CM14 is a 4-wire-controller in compact design for
installation in panels or cabinets.
Application
• Wastewater treatment
• Water treatment and drinking water monitoring
• Ion exchanger
• Surface water monitoring
TI494C/07/EN/01.11
71132861
Your benefits
• Compact instrument in 48 x 96 mm panel mounted housing
• Easy to operate
• Memosens technology
– Use of precalibrated sensors
– Safety thanks to active detection of cable break
• Two contacts for limit contactor
• Second current output for temperature
Function and system design
Memosens technology Memosens makes your measuring point safer and more reliable:
• Non-contact, digital signal transmission enables optimum galvanic isolation
• No galvanic corrosion
• Completely watertight
• Laboratory sensor calibration possible, thus increasing measured value availability
• Predictive maintenance thanks to recording of sensor data, e.g.:
– Total hours of operation
– Hours of operation with very high or very low measured values
– Hours of operation with high temperatures
– Number of steam sterilizations
– Sensor condition
pH/ORP measurement
Liquiline CM14
pH/ORP measurement with Liquiline CM14
Functions of the basic version
Mesaurement of pH and ORP value with glas elctrodes.
This is selected via the menu. The temperature is displayed alternatingly.
Process Check System (PCS)
The live check issues an alarm when the sensor signal does not change over a defined period of time. This may
be caused by blocking, passivation, separation from the process, etc.
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Liquiline CM14
Conductivity measurement Conductive or inductive
Two versions are available for the measurement with conductive (two electrode) sensors or inductive sensors.
An inductive sensor is recommended for the measurement of high conductivities, for concentration
measurement or adhering media.
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The measuring range of a measuring point is determined by the connected digital Memosens sensor.
Sensor Cell constant Measuring range
CLS15D-A1A1 k = 0.01 1/cm 0.05 μS/cm to 20 μS/cm
CLS15D-B1A1 k = 0.1 1/cm 0.1 μS/cm to 200 μS/cm
CLS16D-3C1P1 k = 0.1 1/cm 0.04 μS/cm to 500 μS/cm
CLS21D-C1E1 k = 1.0 1/cm 10 μS/cm to 20 mS/cm
CLS50D-AA1B11 k = 1.98 1/cm 0.1 mS/cm to 2000 mS/cm
Measurement of conductivity or resistivity (conductive)
This is selected via the menu.
Temperature compensation
The following temperature compensation selections are available:
• Linear
• NaCl curve according to IEC 746
• Ultrapure water NaCl (neutral compensation)
• Ultrapure water HCl (acid compensation, also ammonia)
Ultrapure water monitoring acc. to USP (United States Pharmacopeia) and EP (European
Pharmacopoeia)
Ultrapure water monitoring according to USP <645> and EP means that the uncompensated conductivity
value and the temperature are measured and the results are compared by a table.
The controller comes with the following functions:
• Monitoring of "Water for Injection" (WFI) according to USP and EP
• Monitoring of "Purified Water" (PW) according to EP
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Oxygen measurement Measurement of the oxygen content und setting of the sea level
2
3
1
mS/cm
Y
1
Y
2
The oxygen content is displayed in mg/l. The setting of the sea level is performed in m or ft.
This is selected via the menu. The temperature is displayed alternatingly.
Liquiline CM14
Oxygen measurement with Liquiline CM14
Sensor Measuring range
COS51D 0.01 to 100 mg/l
COS22D-*1 0.01 to 60 mg/l
Measuring system A complete measuring system comprises:
• The controller Liquiline CM14
• An assembly with sensor
• A measuring cable
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Example of measuring system with Liquiline CM14
1 Assembly with sensor
2 Measuring cable
3 Controller Liquiline CM14
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