PMA Digital 280-1, Operating Manual

Page: 13 / 52

3.3.4 O
2
measurement
For measurement, lambda probes ( λ probes) are used.
The electromotive force (in Volt) supplied by the λ probes is dependent of the
instantaneous oxygen content and of the temperature. Therefore, Digital 280-1
can display accurate measurement results only, provided that the probe tempera-
ture is known to the indicator.
Enter the temperature in °C in parameter tEmP . When using heated λ probes, the
probe temperature can be entered directly. When using non-heated λ probes, ho-
wever, the displayed values can be accurate only for a narrow temperature band.
g
Unless the probe temperature is known, we recommend using our KS90-1
Oxygen (temperature measurement via a second input).
Configuration:
Adjust O
2
measurement in function 1:
Func r Fnc.1 3 O2 measurement
Display: The displayed value is always a % value.
As it is mostly necessary to cover a wide measuring range, we recommend adju-
sting a high number of digits behind the decimal point during configuration, whe-
reby loss of high values is prevented due to floating decimal point display
(0,0001 (1 ppm) to 99999 is possible) .
Specify the number of digits behind the decimal point below othr :
othr r dP
0 0 digits behind the decimal point
1 1 digit behind the decimal point
2 2 digits behind the decimal point
3 3 digits behind the decimal point
4 4 digits behind the decimal point
Adjust the sensor type to one of the high-impedance voltage inputs in InP :
Specification in BlueControl Effective measuring range
Inp.1 r
S.tYP
41 Special ( 0...100 mV) -2,5...115 mV
42 Special ( 0...1000 mV) -25...1150 mV
43 Special ( -25...90 mV)
44 Special ( -500...500 mV)
These high-impedance inputs are not provided with break monitoring. If necessa-
ry, measurement input protection is possible via limit value processing.
Operation
Digital 280-1 Operating level 13