Safety function
10
TTH200, TTR200, TTH300, TTF300, TTF350 SM/TTX200/TTX300/SIL-EN
The DCS power supply for the transmitter
must be capable of providing the required voltage
level even when the current output is running with the configured high alarm.
The device does not meet safety requirements under the following conditions:
• During
configuration
• When write protection is deactivated
• When HART multidrop mode is activated
• During a simulation
• When the safety function is being checked
Warning!
The device's safety function includes the basic device TTH200-.H, TTR200-.H, TTH300-.H,
TTF300-.H, and TTF350-.H with connected sensor, inclusive of the housing and the process
connections used. The information in the corresponding documentation must be taken into
consideration.
Overall safety accuracy
The value defined for the overall accuracy of the safety function for this device is ± 2 % of the
measuring range.
The basic accuracy depends on the sensor model and is specified in the corresponding data
sheets.
Switch-on time and safety operating mode
After switching on the device, all safety-relevant errors are detected after 2 minutes in low
demand mode.
6.1
Measuring point for SIL 2 – Single configuration
One transmitter
DCS for SIL2
B
C
A00132
J
A
E
D
Fig. 1
A Sensor
B Transmitter
C DCS
D 4 ... 20 mA measurement circuit
E Interface for LCD indicator
