ABB LS4000 Operating Instructions Manual page 101

Installation - Cable
length menu
Installation - Process
parameters menu
Clarifications
regarding the
"process path
length" parameter
OI/LS4000/NH3/H2O-EN
Step Procedure
3 Leave all values unchanged.
4 Click on "Next".
The Installation - Process parameters menu (see page 65) is dis-
played.
Make the following settings:
Process path length
Pressure input
Temperature input
Fixed pressure level
Fixed temperature level
Enable process broadening
Due to the gasket materials used in the transmitter unit and the receiver unit,
it is recommended not to apply test gas with more than 50 ppm NH
To be able to perform calibration for measuring ranges > 50 ppm NH
standard process path length (OPL) of 0.7 m needs to be appropriately re-
duced at a consistent test gas concentration of 40 ppm NH
In the process, the product of the OPL and c
 0.7 * 40 ppm * m. Specified in the following table are:
 Concentration of the test gas c
 the process path length OPL to be entered for 80% of the measuring
range, as well as
 the resulting total concentration c
Measuring range c
test gas
 20 ppm 16 ppm
 50 ppm 40 ppm
40 ppm
 100 ppm
 200 ppm 40 ppm
Step Procedure
5 Leave the other settings unchanged.
6 Click on "Next".
The Installation - Installation flanges menu (see page 67) is dis-
played.
Operating instruction LS4000 for NH
see the following clarifications
FIXED
FIXED
Enter the pressure value
Enter the temperature value
No
must always amount to
meas.value
and
test gas
meas.value
OPL
0.7 m
0.7 m
0.35 m
0.175 m
and H O
3 2
.
3
, the
3
.
3
c
meas.value
16 ppm
40 ppm
80 ppm
160 ppm
101