User's Manual

Micropilot FMR20
Endress+Hauser V. 5, Rev. 3, 20-12-2016 13
FMR20, RIA15 with installed HART communication resistor module
The HART communication module for installation in the RIA15 can be ordered together with
the device.
Product structure, feature 620 "Accessory enclosed":
Option R6 "HART communication resistor hazardous / non-hazardous area"
The voltage drop to be taken into account is:
Max. 7 V
Alternatively available as an accessory, for details see Technical Information TI01043K and
Operating Instructions BA01170K
Circuit diagram / Description
FMR20 connection and RIA15 without
backlight
1
LED
- +
3
2
Y
I
R
s
DC
A0020839
 6 FMR20 block diagram, RIA15 without light, HART
communication resistor module
1 HART communication resistor module
2 Micropilot FMR20
3 Power supply
FMR20 connection and RIA15 with
backlight
1
3
2
Y
I
R
s
DC
LED
- +
A0020840
 7 FMR20 block diagram, RIA15 with light, HART
communication resistor module
1 HART communication resistor module
2 Micropilot FMR20
3 Power supply
Cable specification
Unshielded cable, 2 × 0.75 mm
2
As per IEC/EN 60079-11 section 10.9, the cable is designed for a tensile strength of 30 N (6.74 lbf)
(over a period of 1 h).
The FMR20 is supplied with 5 m (16 ft) cable length as standard. Optional lengths are available with
10 m (33 ft) and 20 m (66 ft).
Lengths can be selected by the user up to an overall length of 300 m (980 ft) and are available by the
meter (ordering option "8") or foot (ordering option "A").
Overvoltage protection
The device is equipped with integrated overvoltage protection.