Table of Contents
Advertisement
4.2
Testing the input of a pH transmitter
4.2.1
Transmitter settings
Depending on the device configuration (manual temperature specification or automatic temperature
compensation), you first have to set the reference conditions for the temperature compensation on the
transmitter.
In the case of a manual temperature specification, you have to set the temperature to 25 °C.
In the case of automatic temperature compensation, the temperature of the connected temperature
probe must be adjusted to 25 °C. If this is not possible, an alternative solution is to connect a resistor of
110 Ω (Pt100) or 1.1 kΩ (Pt1000).
4.2.2
Settings and steps for operating the simulator
1. Test the battery of the pH simulator and visually in-
spect the connecting cable (coaxial cable).
2. Connect the simulator to the transmitter using the cor-
rect coaxial cable.
3. Switch on the simulator.
4. Set the simulator's output resistance to "Direkt" (1).
5. Turn the pH selection switch to "7".
The pH transmitter must display 7.00 pH +0.05 pH. If
necessary, correct the display using the zero point ad-
justment.
6. Turn the pH selection switch to "14". Wait until the val-
ue displayed on the transmitter is stable
The pH transmitter must display 14.00 pH +0.05 pH. If
necessary, correct the display using the slope adjust-
ment.
7. Set the simulator's output resistance to "1000 MΩ".
The displayed pH value is allowed to change by a max-
imum of +0.05 pH, and the output current by a maxi-
mum of 0.5 %.
8. Switch off the pH simulator (2).
4 Operation
1
2
9
Advertisement
Table of Contents
