pH probe with controller M 1122


Measuring range: from 0,00 to +14,00 pH

  • Online Redox measurement
  • PI regulation option
  • Communication output (SELECAN) or galvanically separated current output
  • IP 65 housing
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pH measurement is used in chemical industry, in swimming pools, potable and wastewater treatment and also in different kinds of industrial measurements.

Controlmatik probe M 1122 is designed for continuous measurement of pH in swimming-pools, potable, waste and industrial waters. With special versions of measuring electrodes, it can also be used for measurement of other media. 

The unit consists of:

· pH measuring electrode 

· Controller with graphic display


Electronics evaluates and amplifies the measured potential. PI regulator that independently controls a certain process, can be build in a probe. The probe can be equipped with manual or automatic temperature compensation (depends on customer request) and with galvanic separated 4–20 mA signal on the amplifiers output. The user can easily communicate with a probe over graphic display and four function keys. 

The probe guarantees accurate and continuous measurement.


Ambient temperature
Relative humidity
10...95 % non-condensating
Control unit protection
IP 65
0,2 kg
98 x 64 x 38

pH measurement

Max. Measuring range (M.R.)
from 0,00 to +14,00 pH
Measured value resolution
0,01 pH
Deviation of indication, measured value
maximum 0,5% of M.R.
Zero point shift range
from 0,00 to +14,00 pH
Automatic temperature compensation range
pH input signal:
Input resistance at nominal operating conditions
> 1000 MOhm
Current input at nominal operating conditions
< 1 pA

Electrical data

Power supply
9 - 36 VDC,12 - 24 VAC±10%
2 W

Current output connector

2 (galvanic separated)
Isolation voltage
Current range
4...20 mA
Power supply
9...26 VDC
Output range
adjustable to (MR)
Output Mode options
pH signal output, Regulator output, Temperature
Regulator connector
Regulator 3 point switch or PI regulator
3 x 24 VAC / 250 mA
3 x 24 VAC
Mode options
Motor Control, Pump Control


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