Omega Engineering CN9400 specifications G s, V a n c e d S e t t

Linear Input Calibration (continued)	3 Allocate the output devices at function	SP1.D
	as described in SET-UP, enter the configuration
	into the memory and proceed as follows:

i n g s

9 10 11 12 13 14 15 16

+	–	+	–			L	N
		5Vdc 15mA
1	2	3	4	5	6	7	8

Calculate the values for the controller settings

for HI.SC and SPAN using the example below as a guide:

A d v a n c e d S e t t

26

	Outputs
4–20 mA	1 ohm				Supply
from transducer
1 Power up the controller, and in response to
the prompt						INPT
select an appropriate Linear Range from						NONE
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	Nom. Signal	Nom. Scale				Max. Scale
Lin 1	Span	Span				Settings
Lin 2	0–20 mV	0	– 100			0 – 400
Lin 3	4–20 mV	0		– 100		-25 to 400
Lin 4	0–20 mV	0	–1000			0 to 3000
Lin 5	4–20 mV	0	– 1000			-250 to 3000
	0–20 mV	0	– 2000			0 to 3000
2 Select						UNIT
then select the process unit, °C, °F, Bar, PSI,
Ph, or rh. If the required unit is not shown

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

HI.SC = Nominal Signal Span x required span

actual signal span

(20-4) x (110-0) = 587 (7-4)

SPAN

SPAN = (hi.SC - nominal scale span) x hi.SC

Nominal Scale Span

(587-1000) x 587 = -242

1000

These settings should provide the correct scaling adjustment, but a value for ZEro may need to be established by applying the lowest and highest mV input signal and recording the display offset. Check that this is the same at each end, and enter this plus or minus value as a ZEro adjustment. Should there be a difference between the two readings, a further adjustment of the SPAn setting can be made.

select Set.