Safety Temperature Limiter, Safety-TL4896, acc. to DIN EN 14597, SIL 2
The STL4896 safety temperature limiter is used whereever thermal processes need to be monitored and the system has to 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 STL4896 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 24VDC signal present on the terminals 16-17 for an external alarm signal. Alternatively, the device can be reset using an external contact. In addition, the STL4896 has a programmable analog output with up or downscaling function, as well as a pre-contact.
Programming:
The device is programmable via front side buttons in connection with the graphic display.
Operating modes:The device can be used as:
STB-> Maximum- or minimum-monitoring with hold.
Reset possible after omission of the fault with the external or internal button.
ASTB-> as before, but monitoring the exhaust gas temperature
STW-> Maximum- or minimum-monitoring without hold.
Automatic reset after leaving the dangerous range
Switching hysteresis always acts in the direction of safe range.
The last fault is stored as plain text and can be called up in the working level and deleted.
Temperature sensor:When using the device according to DIN EN 14597, temperature sensors which are approved according to DIN EN 14597 must be used!
Technical data:Power supply (please select when ordering)
Supply voltage: 230VAC ±10%
24VDC ±15%
Power consumption: < 4VA
CE-conformity: EN 61326-1: 2013
EN 61326-2-2: 2013
Environmental conditionsOperating temperature: -10...+55°C
Storage temperature: -30...+60°C
Relative humidity: < 95%
Condensation: not permitted
Vibrations: operation only in vibrationless environment
Approvals Title
EN 14597:2012: temperature control devices and temperature limiters for heat-generating systems
EN 61508:2011 SIL2: functional security safety-related electrical/electronic/programmable electronic systems
Input
Pt100: in the range -100.0...+600.0°C
3-wire, max. line resistance 4 Ohm each line
sensor current <1 mA (non self-heating)
Thermocouple:
Type J: Fe-CuNi -100.0...+800.0°C
Type K: NiCr-Ni -150...+1200°C
Type N: NiCrSi-NiSi -150...+1200°C
Type S: Pt10Rh-Pt 0...+1600°C
Cold junktion compensation integrated.
Accuracy: <0.5 %, ±2 digits
Temperature coefficient: 0.01%/K
Display: graphic LCD display with 128 x 64 pixels, with white LCD backlight
OutputsMain relays : SPDT, <250VAC <200VA <2A
cos Phi >=0.7
<250VDC <80W <2A
forcibly guided, internal fuse 2 A (slow-blow)
Pre-alarm relays: SPDT
<250VAC <500VA <2A ohmic load;
<30VDC <60W <2A
Analogue output: 0/4...20mA burden <= 500 Ohm;
0/2...10V burden > 500 Ohm, galvanically isolated,
output automatically changing (burden dependent)
Accuracy (analogue output): 0.4%; TK: 0.01%/K
Mounting: Front panel mounting, 45mm x 92mm, depth: 119mm
Housing: Polyamide (PA) 6.6 , UL94V-0
Weight: approx. 450 g
Connection: Spring terminals 0,2...2,5mm² (AWG 24 ... 12)
Protection class: Front IP65, DIN EN 60529, BGV A3
Optional accessories:When using Safety-TL4896 as safety limiter -or guard- according to EN14597, safety temperature sensors acc. to EN 14597 have to be used, i.e. TR296/293, TC296/293. Temperature sensors for SIL applications: Temperature sensors without transducers are passive elements and not SIL-classified.
