11
2143014.04 05/2010 GB/D
GB
WIKA Operating Instructions Temperature Transmitter T19
7.1 Preparation
■
Connect a suitable simulation source to the input of the T19 (Pt100).
When simulating a Pt100 connect the simulator in a 3-wire connecting
circuit. We recommend the use of passive resistances. Electronical
simulation sources can cause incorrect measurement values.
■
Connect a mA meter in 4 ... 20 mA-loop according to section 5 (with
R
i
≤ max. permissible load!) to measure the output signal.
■
Connect a suitable power supply to the transmitter.
7.2 Adjustment
Carry out steps
through
in the order given.
Set the lower value of the measurement range with the simulator, e.g.
-30 °C for measurement range -30 ... +50 °C.
Turn the zero potentiometer Z, until the output signal shows the
desired value.
Set the end value of the measurement range with the simulator, e.g.
+50 °C for measurement range -30 ... +50 °C.
Turn the span potentiometer S, until the output signal shows the
desired value.
High output currents (for example 20 mA) should therefore not exist
longer than 1 minute (in total) when doing adjustment. If adjustment
has to be repeated then allow the transmitter to cool down for approx.
20 minutes (disconnect the transmitter from the power supply).
Repeat step
and check output signal of zero point.
Repeat step
and check output signal of span.
7.3 Closing steps
Disconnect the simulator, the mA meter, and the power supply.
7. Adjustment of transmitter
