GE MN_12400 Brochure download pdf (Page 8)

8 | GE Oil & Gas

SIL 2 Capability for Enhanced Safety

The 12400 Series transmitter, SIL2-certified in accordance with IEC61508 per EXIDA, is suitable for

use in safety instrumented functions.

The safety function of the 12400 Series transmitter is not limited to the instrument head but also includes all

measurement components.

The FMEDA analysis results include the entire transmitter from displacer through the torque tube, the sensor,

and the electronics up to the 4-20 mA output signal. In contrast, other available devices limit their analysis to

the instrument head only.

Including all measurement components in the safety function means a higher diagnostic coverage and a Safe

Failure Fraction greater than 90 percent.

Complete Safety Function: From Displacer Up to Analog Output Signal

The 12400 Series instrument has been enhanced with a new sensor bias sub-assembly to enable a better

diagnostic coverage of internal and user faults. Following in the footsteps of many other innovations that have

made GE’s Masoneilan product line a technology leader, this new patented solution improves the diagnostic

analysis on all components between the sensor and the torque rod. In case of failure caused by a loose part or

human error, the spring arm will force the sensor to go into the repeatable failsafe position.

This is particularly useful in detecting the main faults that are often human errors during the coupling procedure.

For instance, the wrong coupling or a loose coupling between the sensor mechanism and the torque rod can occur

when the work is done by untrained people. These errors are now fully detected and diagnosed, and they will

generate a HART fault message and could even activate one of the two optional switches.

Enhanced Diagnostic Coverage

Normal operating

Coupling correctly done

Failure diagnostic

Loosen coupling

The spring arm forces

the sensor to go in

failsafe position.

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GE MN_12400 Brochure Page 8