Evoqua WALLACE & TIERNAN MFC, Instruction Manual

Page: 50 / 268

50
WT.050.580.000.DE.IM.0714
Functions
MFC
4.
4.2.2 pH Measurement
The pH value is a measured variable in the field of water treatment.
The pH measuring system consists of:
• pH module with a solidlysoldered connecting cable
• pH glass electrode
The pH module can be installed to slots 1 to 4 on the MFC. Various
controller functions are available depending on the slot and
application selected.
The electrodes can be installed in the DEPOLOX
®
5/
VariaSens flow block assembly or in separate Y flow-through
adapters.
Installation notes Ambient conditions
The following must be taken into account when installing the pH
measurement:
• Select the sample water extraction point that guarantees a
proper mixture of correction medium and a bubble-free sample
water flow.
• This does not require a certain flow rate.
• The electrode must be immersed at least 2 cm deep into the
sample water.
• If the pH electrode is not installed right next to the MFC,
extension cables with plug connectors are available (see 8.
“Complete Devices, Retrofit Kits and Spare Parts" on
page 215).
• If an extension cable is used (max. 50 m), a impedance
converter (see 8. “Complete Devices, Retrofit Kits and Spare
Parts" on page 215) must be used on the electrode in order to
guarantee a stable measuring signal.
Installing the pH sensor in the
flow block assembly
1 Install the pH sensor in the corresponding opening on the flow
block assembly in the Y flow-through adapter.
2 Screw the sensor cable marked "pH" into place.
3 The pH sensor can be calibrated for the first time after approx.
two to three hours running-in time.
Please note
The calibration must be checked after one day.