Fairbanks FB6002 INSTRUMENTATION - Manual (Page 70)

Section 6: Serial Input / Output
01/13 70 51293 Rev. 2
6.6. 4-20
M
A ANALOG CARD ( 30919 )
The 4-20 mA ANALOG CARD is a Passive Current Loop Device with 16 Bit
High Resolution Output.
4-20mA
Specifications
– 16 bit resolution +/- .01 integral linearity
Current Loop
Voltage
Compliance
•
A PASSIVE DEVICE , as the 4-20 Analog Card is, does not supply any
current loop voltage.
•
Customer’s external source must furnish 7 to 40 VDC power (typical
voltage 24 VDC).
•
The negative (-) power of the supply MUST be isolated from chassis
ground
•
See important CAUTION box below.
•
A separate power supply must be furnished for each output.
Full Scale Setting
Time
– 8 msecs.
Output Impedance – 25 Meg Ohms.
Alarm Current
– 3.5 to 24mA (underload/overload conditions), Offset at
25°C; +/- .1% of full scale. Offset drift; +/- 25 ppm of full
scale per degree Celsius.
Total Output Error – (20mA) at 25°C: +/- .2% of full scale max.
Total Output Drift – +/- 50 ppm of full scale per degree Celsius max.
C A U T I O N
Failure to have an
ISOLATED POWER SUPPLY
WILL CAUSE
CATASTROPHIC DAMAGE!
Above is an example of wiring two (2) passive
nodes with an external power supply.