Endress+Hauser Waterpilot FMX21 - Page 26

Electrical connection Waterpilot FMX21
26 Endress+Hauser
6.1.3 Waterpilot FMX21 with RIA15
The RIA15 remote display can be ordered together with the device.
Product structure, feature 620 "Accessory enclosed":
• Option R4 "Remote display RIA15 non-hazardous area, field housing"
• Option R5 "Remote display RIA15 Ex= explosion protection approval, field housing"
Compensation of the atmospheric pressure must be ensured for the installation. A black,
vented cable gland is supplied for this purpose.
The RIA15 process display unit is loop-powered and does not require any external power
supply.
The voltage drop to be taken into account is:
• ≤1 V in the standard version with 4 to 20 mA communication
• ≤1.9 V with HART communication
• and an additional 2.9 V if display light is used
Circuit diagram / Description
Waterpilot FMX21 connection, HART
communication and RIA15 without backlight
Y
I
R
s
DC
1
2
3
LED
- +
A0019567
 1 Waterpilot FMX21 block diagram, HART with RIA15
process display unit without light
1 Waterpilot FMX21
2 Power supply
3 HART resistance
Waterpilot FMX21 connection, HART
communication and RIA15 with backlight
Y
I
R
s
DC
1
2
3
LED
- +
A0019568
 2 Waterpilot FMX21 block diagram, HART with RIA15
process display unit with light
1 Waterpilot FMX21
2 Power supply
3 HART resistance