Function Check; Pulse Generators - Elster RGV Mode D'emploi

Important! Dirt particles, such as welding beads, swarf and other foreign bodies, may be
contained in the gas for a short while after installation.
For this reason, always fit a coarse filter (e.g. cone strainer) in order to avoid damage to
the piston. Do not forget to remove the coarse filter after approx. 4 to 6 weeks since, should
it become saturated, this would produce an obstacle to flow.
10. Function Check by Means of Pressure Loss Measurement
The correct function of the rotary gas meter can be inferred by measuring the pressure loss.
If the pressure loss has increased by more than 50% compared to the value at the initial start-
up, then there may be dirt, for example, in the measuring chamber that can lead to an
incorrect result being obtained. In comparing the pressure loss, the load and the operating
pressure must be considered.
We recommend recording the pressure loss at several points in the flow when commissioning
and logging these with the current operating pressure. If the current flow rate and operating
pressure in later checks deviate from the original values, then the nominal pressure loss can
be calculated from the original values. The pressure loss is proportional to the absolute
pressure (p ) and the square of the flow rate (Q).
abs

11. Pulse Generators

Type RVG:
LF pulse generators (Type IN-S) or Wiegand pulse
generators (Type IN-W) may be plugged onto the side
of the counter cover for volume pulse output to external
devices (e.g. a volume corrector).
Fit the pulse generator (if required) as follows:
– Slide both guides of the pulse generator into the
guide slot on the counter cover until the guides can
be heard to engage (clicking sound).
– Assign the terminals on the plug in accordance with
the pin assignment on the meter/pulse generator.
– Use screened cables to the external device (in
accordance with DIN 60079-14).
© Elster GmbH · All rights reserved · Subject to technical modification
2
p ~ p · Q
abs
IN-S11
IN-W11
Elster-Instromet
15