Sensor Diagnostic Device; Ptc Sensor Fault; Ptc Sensor Fault Diagnosis; Ptc" Type Temperature Sensors - TECSYSTEM T119 DIN Instruction Manual

SENSOR DIAGNOSTIC DEVICE

This new function allows enabling or disabling the PTC diagnostic device (Foc and Fcc):
Diagnostics disabling method:
power the instrument keeping the TEST button pressed until the FAULT LED comes ON
With the diagnostics disabled, the FAULT yellow LED will be ON all the time.
Diagnostics re-enabling method
Power the instrument keeping the TEST button pressed until all LEDs go OFF. With the diagnostics enabled, the FAULT
yellow LED will be OFF and flash in case of sensor faults.
The T119 DIN control units will be supplied with the sensor diagnostics ENABLED.

PTC SENSOR FAULT

ACTION
one of the PTCs is short-circuited
replace or repair the PTC

PTC SENSOR FAULT DIAGNOSIS

If one of the PTCs is short-circuited or open you get the following warnings:
PTC alarm ALL1(L1)
PTC TRIP release ALL2(L2)
PTC FAN FAN
ATTENTION
If the T119 DIN control unit is not connected to the correct PTC model, the LEDS flash.
The PTC temperature is δnat + T = 1300 ohm.

"PTC" TYPE TEMPERATURE SENSORS

The PTCs can be compared to bimetallic thermostats where the contact opens and closes at the approximate temperature,
defined as their operating characteristic (δNAT=operating temperature).
The sensor is calibrated for one temperature only that can vary from 60°C to 190°C, in 10°C (In relation to the acquired
probe), in 10°C steps (60-70-80-90-100-110-120-130-140-145-150-155-160-170-180-190).
The PTCs are electronic thermometric sensors made with a chemical mixture that vary their electrical resistance according
to the recorded temperature.
There is a δNAT (operating temperature) for the PTCs as well as for the bimetallic thermostats.
The PTCs do not allow precision adjustments since the characteristic resistance values are fixed at –5°C and +5°K of
δNAT.
The PTC characteristic resistance values are set by the DIN 44081 and 44082 standards.
Since the PTC resistance curve is very rapid, in the section between δNAT -5°C andδNAT +5°K, it is quite difficult to make
adjustments in a temperature span of less than +/- 5°K.
10
EFFECT
the FLT yellow LED and the corresponding LED
(ALL1-ALL2-FAN) are flashing
the LEDs go OFF
The FAULT + ALL1 LEDs are flashing
The FAULT + ALL2 LEDs are flashing
The FAULT +FAN LEDs are flashing
T119DIN