Instruction manual

NGA 2000 MLT Hardware
TEST PROCEDURE / TEST POINTS
11 - 5
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
07/2006
1 ( )
not used
not used
2 (signal)
3 (- 6,3 V dc)
4
5 (+ 6,3 V dc)
11.1.6 Physical Zero Alignment
For physical zero adjustment the raw signal of respective measuring channel is set to ± 100.000
counts while purging instrument with zero gas.
The raw measuring values can be shown by pressing "Status" (F2) → "RawMeas." (F2).
11.1.6.1 IR Measurement
For set of physical zero adjustment see Item 17.5 please.
11.1.6.2 Paramagnetic Oxygen Measurement
Set physical zero adjustment by alteration the position of photodiode of the sensor.
A further test is to measure the output voltage of the sensor while purging with test gas.
Test point: “Pin 2” of P23 of PCB “PIC” (Fig. 1-32, too)
Signal: ≈ + 4 V dc
(purging with test gas 25 Vol.-% / 100 Vol.-% oxygen (O
2
), depending
on installed sensor)
11.1.6.3 Electrochemical Oxygen Measurement (EO
2
)
For set / check of sensor see Item 18.2 and 18.3.4 please.
PHYSICAL ZERO ALIGNMENT