WIKA TIF50 Betriebsanleitung Seite 20

7. Electrical connection
Configure the input of the transmitter appropriately for the thermocouple type and the cold
junction compensation actually used, otherwise measurement errors may be caused (see
chapter 6.2 "Configuration").
Should the cold junction compensation be operated with an external resistance
EN
thermometer (2-wire connection), connect this to terminals  and .
7.1.3 Voltage source
Make sure that the mV sensor is connected with the correct polarity.
7.1.4 Potentiometer
Connection of a potentiometer is possible.
7.2 Power supply, 4 ... 20 mA current loop
The model TIF5x field instrument is a 2-wire temperature transmitter; depending on the
version, it can be supplied with various types of power supply. Connect the positive pole of
the power supply to the terminal marked with ⊕ and the negative pole of the power supply
to the terminal marked with ⊖.
With flexible leads we recommend the use of crimped connector sleeves.
The integrated reverse polarity protection (wrong polarity on the terminals ⊕ and ⊖)
prevents the transmitter from damage. The following maximum values are applicable:
Model TIF5x-S: DC 42 V
■
Model TIF5x-I: DC 29 V
■
Model TIF5x-F: DC 30 V
■
The model TIF5x field instrument requires a minimum terminal voltage of DC 13.5 V. The
load must not be too high as, otherwise, in the case of relatively high currents, the terminal
voltage at the transmitter will be too low.
The model TIF5x field instrument is equipped with terminal voltage monitoring ("under-
voltage" detection). If too small a voltage is detected at the terminal (< 13.5 V) the error is
signalled on the output (< 3.6 mA).
20 WIKA operating instructions models TIF50, TIF52