8
Operating instructions for KME flow meter for compressed air and gases
2.2.3 Pulse output (OUt 2) and consumption meter
The KME flow meter features an integrated meter with pulse output, which totalizes the consump
-
tion of compressed air or gas.
With the display menu or the Product Configurator Software the user can set:
•
Pulse duration: 0.02...2 seconds
•
Pulse value: 0.1...1,000 m³
The pulse - pause ratio must be at least 1:2. This means that the time between pulses must be at
least twice the pulse duration.
The minimum time between two pulses is 2 s.
t
OUT 2
1/3
min. 2/3
≥ 2 s
Fig. 4
Pulse-pause ratio
The pulse duration and the pulse value can be calculated with following MIN/MAX-Formula:
Calculating the min.
“pulse value”
or the max.
“pulse duration”
:
IMPW_MIN = NORMV_MAX [m³/h] * IMPL [s] / 1200
IMPL_MAX = IMPW [m³] * 1200 / NORMV_MAX [m³/h]
IMPW
pulse value [m³]
IMPL
pulse duration [s]
IMPW_MIN
min. value for pulse value [m³]
IMPL_MAX
max. pulse duration [s]
NORMV_MAX max. expected standard volume flow [m³/h]
The totalized consumption is stored every minute and is retained even if the supply voltage is
interrupted.
The totalized consumption can be shown on the display. A reset of the consumption meter can be
performed via display menu or via Product Configurator Software.
Maximum consumption value on the display:
The consumption value on the display is limited at 999,999,999.0 m
3
. Above this, the display
shows “LCD maximum”, while the internally the consumption is metered normally till the
maximum value of 3.4 * 10
38
m
3
. Values above 999,999,999.0 m
3
can be read with the Product
Configurator Software.
2.2.4 Setting the standard conditions
The standard volume flow calculation is based on the standard conditions stored in the KME
transmitter unit. The factory setting for the standard conditions complies with DIN 1343:
P
0
= 1013.25 mbar, t
0
= 0 °C
The standard conditions can be changed via display menu or via Product Configurator Software.
2.2.5
Low flow cut-off
Very small (insignificant) flow values can be suppressed by setting a shutdown threshold.
Measured values below the shutdown threshold have no effect on the output signal, dis-
play and consumption meter.
The minimum shutdown value can be set in m³/h or ft³/min.
