OTT PLS - Page 29

Configuring OTT netDL/OTT DuoSens for OTT PLS with 4 … 20 mA
interface
䡵 Create an OTT netDL/OTT DuoSens channel with function block
"U/I/Pt100/"… ("Analog sensors" tab).
䡵 Apply the following settings:
䊳
Terminal block OTT netDL 500: G … K
O
TT netDL 1000: G … M
O
TT DuoSens: C … F
T
erminal block used (screw terminal strip)
of the OTT netDL/OTT DuoSens.
䊳
Measurement mode – with internal supply:
"I 4-20 mA int."
– with external supply:
"I 4-20 mA ext."
䊳
Sensor lag time (s) switches on the OTT netDL/OTT DuoSens
input 7 seconds before the actual measure-
ment process
䊳
If required: record error codes on range
overflow
䡵 Insert a "2-point scaling" function block into this channel and set the appropri-
ate water level values for the electrical values measured (e.g. Point 1: 4 ➝ 0;
Point 2: 20 ➝ 40) With this function it is possible to reference a level zero at
the same time.
Note on Appendices A and B
To reference OTT PLS measured values to a level zero: Enter the contact
gauge/staff gauge measurement, for example using the scaling function of the
datalogger connected to the OTT PLS (e.g. OTT netDL/OTT DuoSens).
Example:
y = ax + b a = 1 for level measurement and –1 for depth measurement
b = reference or offset value
Alternatively with SDI-12/RS-485 interface: set a reference value or offset value
using the SDI-12 transparent mode of a datalogger when starting up.
Fig. 14: Setting operating parameters of
the OTT netDL/OTT DuoSens
"U/I/Pt100/…" function block.
□
Error code if range overflow
29