WIKA T19 - Handbuch (Seite 12)

12
2143014.05 06/2014 GB/D
GB
WIKA operating instructions temperature transmitter, model 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