PuriSys CPF 201

4

Endress+Hauser

Installation

Calibration

When installing a new CPF 201 electrode, perform a two-point calibration using pH 4 and 7 buffer

solutions to establish that the electrode and the transmitter are functional together. To do so, refer

to the operating instructions of the transmitter.

Rinse the electrode thoroughly with ultra-pure water to remove all traces of the buffer solutions

prior to inserting the electrode into the flow assembly.

Since the pH variation in ultra-pure water is very small, routine one-point calibration of the

CPF 201 electrode is performed by comparative sample measurement according to the ASTM

test method. When performing sample measurements take note of the following:

• The sample chamber and the sample line must avoid exposure of the ultra-pure water to the

atmosphere.

– Ultra-pure water is highly unbuffered and the slightest amount of contamination can change

the pH value significantly. Specifically, ultra-pure water rapidly absorbs CO

2 gas from the

atmosphere which lowers the pH value of the sample.

– The sample may contain volatile substances that will rapidly dissipate when exposed to the

atmosphere.

• The sample to be measured should be at the same temperature as the medium stream because

ultra-pure water has a significant temperature coefficient.

• To obtain repeatable measurement results, the flow rate of the sample chamber must be

stabilised. Also, the pressure must be stable.

Installation instructions

The electrode is threaded into the flow assembly and hand-tightened.

When mounting the flow assembly, make sure that the inlet and outlet ports are vertical with the

inlet on the bottom. In this fashion, the electrode mounting hole will be at the top right. This will

ensure that bubbles in the water stream will not collect and interfere with the measurements.

The supplied PVC mounting plate for electrical isolation ensures a noiseless pH reading.

To mount the PVC mounting plate on posts or pipes, use the mounting brackets included in the

package.

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