KROHNE OPTIFLEX 2200C SIL - Manual (Page 5)

INTRODUCTION
1
5
OPTIFLEX 2200 C
www.krohne.com 01/2013 - 4000738603 - AD SIL OPTIFLEX 2200 R03 en
1.3 Device description
This device is a 2-wire level transmitter that uses TDR (Time Domain Reflectometry) / Guided
Radar technology. It measures the distance of liquids, liquid gases, pastes, powders, slurries
and granular products.
Measurements are given through a 4...20 mA current output and can be displayed via a DTM
(device type manager) for remote communication or an integrated display screen with wizard-
driven set-up and online help functions. Only the 4...20 mA current output is used as the safety
function.
When the device detects a measurement error, it supplies an output current less than 3.6 mA.
Although the device can be set to a high error value (≥ 21 mA), some hardware failures can cause
the device to give a low error value (≤ 3.6 mA). For more data, refer to
Limits for supervisor
menu functions related to device configuration on page 17 (2.4.2 RANGE I).
Refer also to "Device description" in the handbook (document [N1]).
1.4 Related documentation
INFORMATION!
The manufacturer designed and developed the device for safety integrity level (SIL) 2.
Data for the SIL approval is not taken from field experience (i.e. it is not
“ proven in use ” ) because
this method can give unrealistic data if assumptions are too optimistic.
[N1] OPTIFLEX 2200 Handbook
[N2] IEC 61508-1 to 7:2010 Functional safety of electrical / electronic / programmable
electronic safety-related systems
[N3] NAMUR Recommendation NE 043 Standardization of the Signal Level for the Failure
Information of Digital Transmitters
[N4] NAMUR Recommendation NE 053 Software of Field Devices and Signal Processing
Devices with Digital Electronics
[N5] OPTIFLEX 2200 Supplementary Instructions for ATEX applications