Dynisco IPX II Series, Operating Manual

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57
COMMISSIONING
When it is decided whether to raise or lower the output current, press the NEXT NEXT
NEXT NEXT
NEXT key, to raise (lower) the 4
mA output signal. Now every time the NEXT
NEXT
NEXT NEXT NEXT key is pressed, the display blinks, and the 4 mA output limit
decreases (-) or increases (+). The decrease or increase is in approximately 2µA increments.
Once the desired trim is reached, press the ENTER ENTER
ENTER ENTER
ENTER key to return to either:
or
Pressing the NEXT
NEXT
NEXT NEXT NEXT key changes to the next function.
7.2.2 7.2.2 7.2.2 7.2.2 7.2.2
L LL
LL
T TT TT
RIM RIM
RIM RIM
RIM
20 20 20 20 20
M M
M M
M
A A A A A
The next function of the IPX II Series Smart Pressure Transmitter is TRIM 20 MA
TRIM 20 MA
TRIM 20 MA TRIM 20 MA TRIM 20 MA. This allows trimming
of the 20 mA output current. The display will sequence as follows:
This function is only for the purpose of adjusting the 20 mA limit of the IPX II Series
Smart Pressure Transmitter loop current to be exactly 20 mA according to the plants
local standard. This is NOT for the purpose of ranging the transmitter!
The 20 mA limit is factory calibrated to a precision standard. Do not arbitrarily trim the output unless
a qualified and accurate local standard is available to measure the adjusted 20 mA output! Also note
that the 20 mA limit should not be trimmed by more than about + 50 µA, or the transmitter operation
may be impaired.
If trimming the 20 mA limit is still desired press ENTER
ENTER
ENTER ENTER ENTER. The IPX II Series Smart Pressure Transmitter
will now output a current equal to its internally set 20 mA current. This 20 mA value should be read
on an external meter and compared to a local standard. It is advisable to use a well calibrated
voltmeter to make these comparisons. It is very possible that the IPX II Series Smart Pressure
Transmitter will be more accurate than many voltmeters. In this case, trimming will make the IPX II
Series Smart Pressure Transmitter less accurate rather than more accurate!
Once TRIM 20 MA TRIM 20 MA
TRIM 20 MA TRIM 20 MA
TRIM 20 MA has been selected, the display will alternate as follows: