SICK EuroFID, Operating Instructions Manual

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Main Menu Functions
EuroFID · Operating Instructions · 8011094 V2.3 · © SICK AG 95
Pressure ratios on the ejector pump
Control of the ejector pump
D i a g n o s i s
S a m p l e I n p u t P r e s s u r
a c t u a l 9 9 6 . 5 m b a r
I n s t r . - A i r P r e s s u r e
a c t u a l 2 4 0 4 . 6 m b a r
S a m p l e G a s P r e s s u r e
a c t u a l 1 1 4 5 . 3 m b a r
F a c t o r P i n p . / P m e a p g a s
0 . 8 7 6 6
F a c t o r P d r i v / P m e a p g a s
2 . 1 0 1 3
1 . 2 p p m
R a n g e . . . 1 0 0
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Menu title
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P2 (P): Sample gas pressure at the gas inlet of the analyzer
unit 1
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P1 (T): Pressure of instrument air on the ejector pump 2
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P3 (M): Sample gas pressure before the sample gas
capillary 3
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Q1: Quotient of P2 and P3
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Q2: Quotient of P1 and P3
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Current measured value
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Current measuring range (measuring range end value)
1
Set range: Ambient pressure ±50 mbar; greater deviations trigger a malfunction message (system failure)
2 determines the suction capacity of the ejector pump
3 Backpressure upstream from the sample gas capillary; is kept constant in relation to the ambient pressure
D i a g n o s i s
E j e c t o r
F i x e d P
S a m p l e I n p u t P r e s s u r
a c t u a l 1 0 0 6 . 6 m b a r
I n s t r . - A i r P r e s s u r e
a c t u a l 2 4 0 4 . 6 m b a r
S a m p l e G a s P r e s s u r e
a c t u a l 1 1 4 5 . 3 m b a r
F a c t o r
3 7 4 1 . 6 6 5 0
0 . 1 8 p p m
R a n g e . . . 1 0 0
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Menu title
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Setpoint value: Ambient pressure – (5 … 10 mbar)
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Setpoint value: 2350 … 2500 mbar
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Setpoint value: Ambient pr 130 mbar
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Setpoint value: 2900 … 4900
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Current measured value
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Current measuring range (measuring range end value)
The “factor” is calculated from Q1 and Q2 and other individually determined
characteristic parameters of the ejector pump. The dimensionless “factor”
represents the hypothetically determined measured value of a test gas, which
contains approx. 8,000 ppm C
3
H
8
. The “factor” is used to compensate the
variable dilution of the sample gas in the ejector pump.
In addition the current “factor” is constantly compared with the threshold
values:
– If the “factor” drops below the lower threshold value, this is interpreted as
filter soiling (sample gas intake faulty).
– If the “factor” exceeds the upper threshold value, the EuroFID issues a
warning against implausible measured values.
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