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INTRODUCTION
1
1.3 Device description
This device is a 2-wire level transmitter that uses FMCW (Frequency Modulated Continuous
Wave) / Radar technology. Radar is a non-contact technology. It measures the distance, level,
mass, volume, flow rate and reflection of liquids, pastes and slurries. It is particularly suitable
for the level measurement of corrosive and viscous 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.
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
this method can give unrealistic data if assumptions are too optimistic.
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
menu functions related to device configuration
Refer also to "Device description" in the handbook (document [N1]).
1.4 Related documentation
[N1] SmartLine® RM77 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] SmartLine® RM77 Supplementary Instructions for ATEX applications
6
on page 23 (2.4.2 RANGE I).
www.honeywell.com/ps
SMARTLINE® RM77
"
proven in use
"
) because
Limits for supervisor
34-VF-25-105 iss.1 GLO April 15 US
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