Operation, 4 scaling – KROHNE OPTISENS AAS 2000 EN User Manual

Page 27

OPERATION

OPTISENS AAS 2000

www.krohne.com

12/2008 • MA AAS 2000 R01 en

Air pressure conversion

It is important to enter the correct air pressure before doing an air calibration. Air pressure is
measured in mbar (which is exactly the same as the SI-unit hPa).Below is a formula and a table
to convert from inHG to mbar (and thus to hPa):

mbar = (inHg * 1000) ÷ 29.5

5.4 Scaling

The Scale / Alarm

Scale / Alarm

Scale / Alarm menu (see the OPTISENS MAC 080 manual) allows the user to set the high and

low boundaries for a 4...20 mA output signal. In addition, this menu allows the user to set high
and low alarm values to switch a relay when solids have reached critical points.

inHg

mbar

29.2

990

29.3

993

29.4

997

29.5

1000

29.6

1003

29.7

1007

29.8

1010

29.9

1014

30.0

1017

30.1

1020

30.2

1024

30.3

1027

30.4

1030

Max

sets the 20 mA point output

Min

sets the 4 mA point output (may be negative for special applications)

Hi-Alarm

sets the high alarm set point; the value zero inactivates the alarm

Low-Alarm

sets the low alarm set point; the value zero inactivates the alarm

.book Page 27 Monday, December 15, 2008 12:43 PM