KROHNE OPTITEMP TT 10 C-R EN - Manual (Page 38)

5
OPERATION
38
OPTITEMP TT 10 C/R
www.krohne.com 02/2013 - 4000752703 - MA OPTITEMP TT 10 C/R R03 en
• Connect the power supply and the precision measuring device for current measurement
according to the connection diagram in the chapter "Electrical connections" (the typical power
supply is 24 VDC and depends on the overall output load (also refer to
Output load diagrams
on page 47).
• Connect the input signal (Pt100 or thermocouple simulator) according to the connection
diagram in the chapter "Electrical connections".
• Set an input signal that delivers an output signal of approximately 12 mA.
• Wait circa 15 minutes and check the stability of the output signal afterwards. Only if the output
signal is stable then, the transmitter is ready for calibration and you can go to the next step!
• Use the input simulation source to set an input signal T
in
that corresponds to the selected
lower measuring range value (e.g. 100 Ω for a measuring span from 0...+100°C / +32...212°F).
• Use the potentiometer for zero point setting to set exactly a current of I
out
= 4.00 mA (refer to
the drawing above).
• Use the input simulation source to set an input signal T
in
that corresponds to the selected
upper measuring range value (e.g. 138.5 Ω for a measuring span from 0...+100°C /
+32...212°F).
• Use the potentiometer for the measuring span setting to set exactly a current of
I
out
= 20.00 mA
• Repeat the steps 5 till 8 until all of the signals are set exactly.
• Secure the potentiometers with varnish.
i The calibration is complete now.
Potentiometers of the rail-mount version
1 Potentiometer for zero point setting
2 Potentiometer for measuring span setting
INFORMATION!
The following calibration procedure is valid not only for the rail-mount transmitter, but also for
the Ex and the Non-Ex version of the in-head transmitter.
.book Page 38 Tuesday, February 26, 2013 1:43 PM