Characteristics:
The STL50Ex safety temperature limiter is used where ever thermal processes in explosion-prone environments (up to zone 0) must be monitored and the system must be transferred into a safe operational state in case of fault. If the permissible temperature limit value is reached, or if a fault occurs within the permissible temperature range on the monitoring equipment (sensor open, sensor short-circuit, failure of a component part in the device, fault in the software, failure or inadmissible value of the supply voltage etc.), the STL50Ex switches off without delay.
The alarm contact is activated, the LED ALARM on the front panel and the back-lighting of the display light up, and the error cause is indicated as plain text on the display.
In addition, there is a 24 V DC signal present on the terminals 17-18 for an external alarm signal.
Brief description:
Programming:
The device is programmed using the front side buttons, in connection with the graphics display.
Operating modes:
The device can be used as:
STB: Maximum or minimum monitoring with lock. Reset following removal of the fault through actuation of the front-sided button or externally connected pushbutton
ASTB: As before, however for the monitoring of the exhaust gas temperature
STW: Maximum or minimum monitoring without lock. Reset automatically on return into the permissible range
Switching hysteresis always acts in the direction of safe range.
Error log memory:
The last fault is stored as plain text and can be called up in the working level and deleted.
Temperature probe:
Attention: The device may be operated only with temperature probes which are certified according to DIN EN 14597!
Technical data:
Input double thermocouple: intrinsically safe ATEX II (1) G [EX ia] IIC/IIB or II (1) D [Ex iaD]
Certification: TUV 07 ATEX 554295
Input thermocouples:
J (Fe-CuNi): -100.0 to +800.0 °C
K (NiCr-Ni): -150 to +1200 °C
N (NiCrSi-NiSi): -150 to +1200 °C
S (Pt10Rh-Pt): 0 to +1600 °C
Output: relay, 1 x CO contacts (SPDT)
Power supply: 24VDC ± 15%
Housing material: polyamide (PA) 6.6 UL94 V-0
Housing: DIN rail mounting TS35
Floor space: 50x100 mm² (BxH)
Mounting height: 110 mm
Weight: ca. 450g
Connection: screw terminals 0.14 to 2.5mm²
Housing protection: IP20, DIN EN 60529, BGV A3
Please note: Sensors need to be ordered separately!
