
83
11 Supplement
NCR-84 Two-wire 4 … 20 mA/HART
51141-EN-181127
Integrated clock
Date format
Day.Month.Year
Time format
12 h/24 h
Time zone, factory setting
CET
Max. rate deviation
10.5 min/year
Additional output parameter - Electronics temperature
Range
-40 … +85 °C (-40 … +185 °F)
Resolution
< 0.1 K
Deviation
±3 K
Output of the temperature values
Ʋ Indication
Via the display and adjustment module
Ʋ Analogue
Via the current output, the additional current output
Ʋ Digital
Via the digital output signal (depending on the electron-
ics version)
Voltage supply
Operating voltage U
B
Ʋ Non-Ex instrument
12 … 35 V DC
Ʋ Ex-d instrument
12 … 35 V DC
Ʋ Ex-ia instrument
12 … 30 V DC
Operating voltage U
B
- illuminated display and adjustment module
Ʋ Non-Ex instrument
18 … 35 V DC
Ʋ Ex-d instrument
18 … 35 V DC
Ʋ Ex-ia instrument
18 … 30 V DC
Reverse voltage protection
Integrated
Permissible residual ripple - Non-Ex, Ex-ia instrument
Ʋ for 12 V< U
B
< 18 V
≤ 0.7 V
eff
(16 … 400 Hz)
Ʋ for 18 V< U
B
< 35 V
≤ 1.0 V
eff
(16 … 400 Hz)
Load resistor
Ʋ Calculation
(U
B
- U
min
)/0.022 A
Ʋ Example - Non-Ex instrument with
U
B
= 24 V DC
(24 V - 12 V)/0.022 A = 545 Ω
Potential connections and electrical separating measures in the instrument
Electronics
Not non-floating
Reference voltage
11)
500 V AC
Conductive connection
Between ground terminal and metallic process fitting
11)
Galvanic separation between electronics and metal housing parts
925-0373 Rev A