CAL Controls 3300 Operating Manual page 31

Linear Input Calibration (continued)
4–20 mA
1 ohm
from transducer
1 Power up the controller, and in response to the
prompt
INPT
Linear Range from the table below.
Ensure that the Nominal Signal Span chosen is wider
than the transducer's actual signal span, and the
Nominal Scale is wider than the full scale of the
engineering units to be displayed.
Linear
Range
Lin 1
Lin 2
Lin 3
Lin 4
Lin 5
2 Select
UNIT
°F , Bar , PSI , Ph , or rh . If the required unit is not
26
shown select Set .
9 10 11 12 13 14 15 16
– + –
+
L N
5Vdc 15mA
1 2 3 4 5 6 7 8
Outputs
Supply
nonE select an appropriate
Nom. Signal Nom. Scale
Span Span
0–20 mV 0 – 100
4–20 mV 0 – 100
0–20 mV 0 –1000
4–20 mV 0 – 1000
0–20 mV 0 – 2000
, then select the process unit, °C ,
3 Allocate the output devices at function
as described in SET-UP , enter the configuration
into the memory and proceed as follows:
Calculate the values for the controller settings for
HI.SC
as a guide:
4 to 7mV input from transducer is required to
display 0 - 110 units
Chose Linear Range Lin4 4-20mV = 0 to 1000 units.
HI.SC
SPAN
Max. Scale
Settings
0 – 400
These settings should provide the correct scaling adjustment,
-25 to 400
but a value for
0 to 3000
applying the lowest and highest mV input signal and
-250 to 3000
recording the display offset. Check that this is the same at
0 to 3000
each end, and enter this plus or minus value as a
adjustment. Should there be a difference between the two
readings, a further adjustment of the
be made.
and using the example below
SPAN
= Nominal Signal Span x required span
actual signal span
(20-4) x (110-0) = 587
(7-4)
= ( hi.SC - nominal scale span) x hi.SC
(587-1000) x 587= -242
1000
may need to be established by
ZERO
SPAN
SP1.D
Nominal Scale Span
ZERO
setting can