Liquisys M CCM223/253

2

Endress+Hauser

Function and system design

Features of the basic version

(EK)

Measurement of free chlorine, chlorine dioxide and total chlorine

The sensor is selected from the menu. The temperature is displayed but the reading can also be

hidden. The EP version has an alternative feature that allows simultaneous display of the pH and redox

measurements.

Calibration

The CCS140/141 sensors for free chlorine and the CCS240/241 sensors for chlorine dioxide are zero-

current-free and therefore require only single-point calibration. This is carried out by entering a DPD

reference measured value.

The sensor CCS120 is also calibrated by entering a DPD reference measured value. Additionally you can

calibrate the zero point of the sensor CCS120 (recommended for measurements below 0.1 mg/l).

Configuration

Different alarms are required depending on application and operator. Therefore the transmitter

permits independent configuration of the alarm contact and error current for each individual error.

Unnecessary or undesirable alarms can be suppressed in this manner. Up to four contacts Up to two

contacts can be used as limit contacts (also for temperature), to implement a P(ID) controller or for

cleaning functions.

Direct manual operation of the contacts (bypassing the menu) provides quick access to limit, control

or cleaning contacts, permitting speedy correction of deviations.

The serial numbers of the instrument and modules and the order code can be called up on the display.

Additional functions of the

Plus package (ES)

Current output configuration

In order to output wide measuring ranges while still achieving a high resolution in specific ranges, the

current output can be configured as required via a table. This permits bilinear or quasi-logarithmic

curves, etc.

Manual pH compensation for free chlorine

Measurement of free chlorine with amperometric sensors is pH-dependent while DPD measurement

used for calibration is pH-independent. Manual pH compensation means the instrument can also be

used to measure a variable pH value with a slow rate of change.

Process Check System (PCS)

It comprises two independent safety functions:

• Errors in applications without control are detected by monitoring the limit beween plausible and

implausible measured values, i.e. the alarm threshold.

• Errors in applications with control are detected by the controller monitor which monitors freely

adjustable, maximum permissible time intervals and reference value overshoot or undershoot.

Live check

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.

Additional functions of

version EP

Alternatively measurement of pH or ORP

This extension allows additional measurement of pH value or ORP in an instrument. It also allows

control of the pH value in the process.

Automatic pH compensation means the instrument can also be used to measure a variable pH value

which is subject to frequent changes.

Second current output

The second current output is freely configurable for the output of temperature, of the main measured

value (free chlorine, chlorine dioxide, total chlorine) or actuating variable.

Current input

The current input of the transmitter allows two different applications: controller shut-down in case of

lower flow rate violation or total failure in the main flow as well as feedforward control. Both functions

are also combinable.