Crystal nVision Lab Reference - Manual (Page 31)

Modules  29
nVision Operation Manual
Logging Interval
Fastest Logging Interval. . . . . . . 6 readings per second.
Note: Although nVision logging interval may be set to a faster rate, the MA20 module will update the reading at 6 times per second.
ATEX and IECEx Scheme Entity Parameters
The MA20 Module has these specific input entity parameters:
Ui = 28 V Uo = 6.6 V
li = 93.3 mA lo = 4.45 mA
Pi = 653.3 mW Po = 7.34 mW
Ci = 0.36 uF Co = 0.5 uF **
Li = 39.1 uH Lo = 12 uH *
* Total cable inductance between all modules
** Dependent on the supply to the terminals but shall not be greater than 0.5 uF
Current (mA) Input
 Accuracy
±(0.015% of reading + 0.002mA)
Accuracy specifications include all effects of linearity, hysteresis, repeatability, temperature, and stability within the specified operating temperature range
for one year.
Note: Exposure to environmental extremes of temperature, shock, and/or vibration may warrant a more frequent recertification period.
 Ranges, Resolutions, and Units
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 55mA (MA20+)
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 25mA (MA20)
Max Allowable Current . . . . . . . . . . . 93.3mA
Note: Inputs protected by resettable fuse
Resolution . . . . . . . . . . . . . . . . . . . . . . . 0.001mA or 0.01%
Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . mA, % 4-20, %10-50
 mA Input
Input Resistance . . . . . . . . . . . . . . . . . < 17.2 Ω
Voltage Burden @ 50mA . . . . . . . . . < 0.86 V
Voltage Burden @ 20mA . . . . . . . . . < 0.35 V
 HART mA Input
HART Resistance . . . . . . . . . . . . . . . . . 250 Ω