Description 0/4-20Ma Outlet; Adjustment Of The Current Signal Outlet; Adjustment Of The Load; Adjustment Of The Max. Current Signal At The Ma-Outlet - M&C PMA Series Instruction Manual

13.3.2

DESCRIPTION 0/4-20MA OUTLET


Every measuring range meets 0/4-20 mA (standard measuring ranges: 0-1 %; 0-3 %; 0-10 %; 0-30 %;
0-100 % O )
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
Current range switchable (see 13.3.3; 4-20 mA standard factory setting)

Galvanically isolated (internal power supply)

For a max. load of 300 Ω in standard factory setting (max. 7 V); switchable to a max. load of 900Ω (max.
22 V)

A max. limit of 20.5–23 mA is adjustable (see 13.3.5; 21 mA standard factory setting)

A min. limit for 0-20 mA is at 0 mA resp. for 4-20 mA at 2.9 mA

Linear range from 0 to 22 mA resp. 3.2 to 22 mA
General evaluation of the 0-20 mA signal:
Measuring Range
General evaluation of the the 4-20 mA signal:
Measuring Range
Lower deviation
If the oxygen measurement is used as a safety function according to SIL the 4-20mA signal has to be evaluated
as follows:
Measuring Range
Lower deviation
Current limiting occurs here when the current is ≥ 21mA.
13.3.3

ADJUSTMENT OF THE CURRENT SIGNAL OUTLET

The range of the mA current signal can be switched via jumper JP13 and JP15 on the main board.
0-20 mA: JP13, JP15 in position 2-3; 4-20 mA: JP13, JP15 in position 1-2 (see figure 12).
13.3.4

ADJUSTMENT OF THE LOAD

Via jumper JP9 on the main board the load will be adjusted.
Max. 300 Ω: position 1-2 (standard); max. 900 Ω: position 2-3 (see figure 12).
13.3.5

ADJUSTMENT OF THE MAX. CURRENT SIGNAL AT THE MA-OUTLET

For adjustment of the max. output current:

E.g. introduce air into the analyzer (20.9 % O
get the max. output signal.

Measure current at D-sub-connector X4, pin 1 and 2

Adjust desired max. current at potentiometer P1 on main board (see figure 12)
www.mc-techgroup.com
Measuring Range
exceedance
Measuring Range
Measuring Range
Measuring Range
Measuring Range
) and switch to the 10%-measuring range This way you
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PMA30 | 1.01.03
exceedance
exceedance
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