Thermocont® ST
digital temperature sensor with resistance thermometer Pt100, 4-digit LED-display, 2 PNP-switching outputs, 2- or 3-wire-electronics selectable
- On-site programming with bright LED display
- Many variants of process connections
- ATEX approval
Description
The device Thermocont® ST with integrated digital evaluation electronic is a compact sensor for measuring and monitoring of temperatures in the range from -100°C up to +500°C.
Because of the integrated four digit digital display and two implemented PNP-switching outputs, separate evaluation and display devices are not necessary in most cases.
Function
Through the resistor Pt100, that is implemented in the sensor, flows a constant current. This current leads to a voltage drop, that becomes higher or lower, dependent on the measured medium temperature. The resistance proportional signal that is produced at the Pt100 is recorded from a processor with high resolution, linearized and adjusted according to the settings and converted in to a high resolution output signal of 4…20mA or 0…10V.
By using 3 keys and an LED display the sensor measurement range, a zero correction in the range of -25,0 K to +25,0 K (e.g. for extraction of dissipation‘s in the measurement signal that is produced through the container wall), the PNP-switching outputs and the damping can be adjusted or the behaviour in the case of failure and the release of the fast adjustment can be set. The switching state of the two PNP-switching output is signalled by one LED for every output.
| Output variations A/B | 4…20mA, 2-wire |
|---|---|
| Output variations E/F | 0…10 V, 3-wire |
| Permissible supply voltage | 14,5 V…45 V DC |
| Residual ripple | ≤ 2Vss |
| Deviation Pt100 | 0°C; ±0,15K (class A) 0°C; ±0,30K (class B) 0°C; ±0,10K (class AA) |
| Characteristics deviation | ≤ ±0,2K |
| Resolution | ≤ 1 µA resp. 0,5mV |
| Adjustment range damping | 0,3s…30s 100 steps |
| Switching outputs (S1 / S2) | 2xPNP-switching on +VS |
| Output current | > 250 mA current limited short circuit protected |
| Protection class | IP65 (EN/IEC 60529) IP67 (EN/IEC 60529) |
| Material sensor tube | Steel 1.4404 (AISI 316L) Steel 1.4571 (AISI 316Ti) |
| Material Process connection | Steel 1.4404 (AISI 316L) Steel 1.4571 (AISI 316Ti) |
| Material Connection housing | CrNi-Steel PBT POM |
| Material connection cable | PE – polyethylene |
| Process temperature | -100°C…+500°C |
| Ambient- , storage temperature | -40°C…+85°C |
