Kobold MAS Series, Инструкция по эксплуатации

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MAS Instruction Manual
Page 16
right most digits will blank and only the left-hand “1” will appear
on the display.
Overrange conditions are indicated by the display and/or output
going to a high level, above the full scale range. After the overrange
condition has been removed, it may take several seconds for the
MAS to recover and resume normal operation. This will not harm
the instrument.
NOTE 4 O
PTIONAL
4-20 mA O
UTPUT
S
IGNAL
:
The 4-20 mA output signal current flows from the 4-20 mA output
pin on the “D” connector through the load (50 to 500 ohms) to
ground (see Section 2.5.1, 9-P
IN
“D” C
ONNECTOR
P
IN
A
SSIGNMENTS
).
Figures 3-1 and 3-2 illustrate single and multiple installations
with current loop outputs.
NOTE 5 Z
ERO AND
S
PAN
A
DJUSTMENTS
:
The zero and span potentiometers are accessed through marked
ports on the right side of your MAS. If your zero output is more than
±
1.5% of full scale, you may adjust the zero potentiometer when
you are absolutely certain that you have zero flow.
Since the output does not indicate negative numbers, it is necessary
to adjust down from a slightly positive reading. Slowly rotate the
zero pot clockwise until a positive reading is indicated. To complete
the zero adjustment, slowly turn the pot counterclockwise until
zero is reached.
Normally, span adjustments are not made unless you are Normally, span adjustments are not made unless you are
Normally, span adjustments are not made unless you are Normally, span adjustments are not made unless you are Normally, span adjustments are not made unless you are
calibrating your MAS, as described in Section 5.
calibrating your MAS, as described in Section 5.
calibrating your MAS, as described in Section 5. calibrating your MAS, as described in Section 5.
calibrating your MAS, as described in Section 5. The span
adjustment should not be used unless you have a known precise
non-zero flow rate that you wish to match.
NOTE 6 A
TTITUDE
:
Unless specified otherwise, your MAS has been calibrated for
installation with the flow direction in the horizontal plane (
±
15
°
)
with the enclosure facing upward. If your actual installation
orientation is different, you will have to make a small zero
adjustment.