Vaisala MI, Инструкция по эксплуатации

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MI instruction manual
Document/Revision No. IM-EN-MI /2.00 Effective: September 2, 2019
6.4 mA output module PR-50021
The mA output module card adds mA outputs to Multichannel user interface MI. On
the module card there are two independent 4-20 mA current sources. Both current
outputs are configurable independently to indicate for example process concentration
or temperature or other diagnostic data of any connected refractometer. A mA output
has traceable calibration, accuracy is ±0.02 mA.
Maximum load (compliance) is 1000 Ohm. There is a place inside the Multichannel
user interface MI where the cable shield can be connected for grounding.
Cable specifications
Conductor cross section 0.14-1.5 mm
2
(28-16 AWG)
Tightening torque 0.25 Nm (0.18 lbf.ft)
10 mA out 1+
9 mA out 1-
8 no connection
7 no connection
6 mA out 2+
5 mA out 2-
4 no connection
3 no connection
2 Frame ground
1 Frame ground
Figure 6.9 mA output pinout
The mA outputs are compliant to Namur NE43. NAMUR NE 43 uses the 3.8 to 20.5 mA
signal range for measurement information, with values ≥21 mA or ≤3.6 mA to indicate
diagnostic failures (see Figure 6.10). With that information, it is easier to detect a failure
condition on a refractometer, for example, it clearly tells you if you have an empty pipe.