1.7 Connecting components
Temperature module TED8xxx / page 20
What in case of a faulty sensor
The measurement input (Pin 10 and 11) is connected internally to the output of the
current source (Pin 3 and 4) via a 1 k
Ω
resistance.
Therefore the following behavior can be expected with a faulty sensor:
•
No sensor connected
Error message „no sensor“, the display shows the upper range limit for actual
resistance or actual temperature. The output cannot be activated.
•
Pin 10 and / or Pin 11 are not connected.
The resistance measurement is done as 2-wire measurement, the resistances of
cable and connectors are included in the measurement.
The temperature control works at normal conditions.
•
Pin 3 and / or Pin 4 are not connected
The resistance measurement is done as 2-wire measurement, the resistances of
cable and connectors are included in the measurement.
The temperature control works at normal conditions.
1.7.8 Connecting TEC elements with voltage detector
The TEC element is connected between pins 5,6,7 (plus pole) and pins 13,14,15
(minus pole). For a 4-point measurement of the TEC voltage connect the TEC
element to pin 2 and 9 to measure the voltage directly at the TEC element.
Pin 2 and pin 9 may also be connected directly to the plug at the temperature module
(i.e. pin 2 with pin 5,6,7 and Pin 9 with pin 13,14,15), but this may lead to a
measurement error due to a voltage drop in the lines to the TEC element. The
indicated voltage will then be slightly higher.