JUMO 202610.0, Operating Instructions Manual, Page: 42 / 68

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10 Calibration
10.1 General
When to
calibrate? - during commissioning
- when the sensor module is replaced
- after lengthy breaks in operation without supply voltage
Application-
specific
calibration
cycles - drinking water: 1 to 6 months
- monitoring of waterbodies
(river or lakes): 1 to 4 months
- municipal effluents: 2 weeks up to 3 months
- industrial effluents: 1 week to 2 months
10.2 Calibrating
General The transmitter is matched to the specific characteristics of the sensor module
during calibration.
Since the measuring system of this transmitter does not require zero-point
calibration, calibration is performed as single-point calibration.
Calibration can generally be carried out in two ways:
- in vapor-saturated air, i.e. in close proximity to the water surface. The
sensor must , however, remain dry !
- in air-saturated water. For this, the water is aerated until it is saturated with
air.
Air calibration As it is rather involved to produce air-saturated water and difficult to
reproduce, the simpler method of air calibration is recommended for industrial
measurements.
Preconditions - Transmitter, terminal box / operating unit and indicator must be connected
and powered.
➩
Chapter 7 “Installation”, page 30ff.
- The sensor module (membrane and/or the optional protective film) is clean
and dry on the outside.
- The transmitter is in the air, as close as possible to the water surface.
In many cases, it will be sufficient to clean the transmitter head,
➩
"Cleaning”, page 58.
Pressure fluctuations in the measured medium will affect the
output signal!
The sensor must remain dry during calibration!