Endress+Hauser RIA15 - Product Safety

RIA15
8 Endress+Hauser
Wiring with switchable backlighting
An additional current-limited current source is required to implement switchable backlighting, e.g.
active barrier RN221N. This current source is used to supply the LED backlighting of up to 7 RIA15
process display units without causing an additional voltage drop in the measurement loop. The
backlighting can be switched on and off using an external switch.
LED
- +
-
+
I
Y
1
+
-
O-
L
N
PE
O+
7
6
5
+
-
O-
L
N
PE
O+
8
4
2
3
9
10
A0028248
1 Process display unit RIA15
2 3-wire connector, e.g. WAGO 221 series
3 2-wire sensor
4 Terminal block on top-hat rail
5 Active barrier, e.g. RN221N
6 4 to 20 mA output to the control unit
7 Power supply
8 Current source, e.g. RN221N
9 Switch to activate backlighting
10 Power supply
Supply voltage
The display unit is loop-powered and does not require any external power supply. The voltage drop 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 lighting is used.
Performance characteristics
Reference operating
conditions
Reference temperature 25 °C ±5 °C (77 °F ±9 °F)
Humidity 20 to 60 % relative humidity
Maximum measured error
Input Range Measured error of measuring range
Current 4 to 20 mA
Over range up to 22 mA
±0.1 %
Resolution
Signal resolution > 13 bit
Influence of ambient
temperature
< 0.02 %/K (0.01 %/°F) of measuring range
Warm-up period
10 minutes