GREAT PLAINS QM240 Manual del usuario - Página 3

Navegue en línea o descargue pdf Manual del usuario para Instrumentos de medida GREAT PLAINS QM240. GREAT PLAINS QM240 16 páginas. Positive displacement fuel meter

INSTALLATION

Before installing your meter, review
the safety instructions given above�
Examine your meter to make sure
there are no visible signs of shipment
damage� Plan your meter installation
by reviewing the following procedures�
Your system must be mounted on a
vented tank� If the tank is unvented,
your local dealer or distributor can
supply a pressure cap�
If the meter is located in a rigid piping
system where the fluid is trapped
(for example, by gravity, valves or
nozzles) thermal expansion of the fluid
can create pressure spikes that can
damage a meter� Install a thermal relief
valve or otherwise allow for thermal
expansion of the fluid�
The flowmeter MUST be mounted so
that the rotor shafts are in a horizontal
plane� Mounting the meter with the
mechanical display facing horizontally
will orient the rotor shafts correctly�
The mechanical display should never
face upwards or toward the ground�
The weight of the rotors must be
supported by the horizontal rotor shafts�
If installed incorrectly, performance,
life or accuracy could be affected�
(see Figure 1)
Horizontal Flow
figure 1
Liquid can flow in a horizontal direction,
or a vertical direction, but in each case
the rotor shafts must be in a horizontal
plane�
It is preferred to install the flow-meter
upstream of a flow control or shut-off
valve, as the back pressure provided
by the valve will be beneficial to system
accuracy� The flow meter should
remain full of liquid at all times when
connected�
Do not operate the flow-meter directly
discharging to the atmosphere�
Prior to installation, determine whether
horizontal or vertical flow is required�
For vertical flow installations the liquid
should travel from bottom to top, i�e�
it should rise vertically through the
flow-meter� This will ensure that the
flow-meter remains full of liquid, and
will prevent air entrapment in the meter�
The back of the meter housing is
embossed with "INLET" and "OUTLET"
adjacent to its respective port to assist
in correct piping connections�
Correct
InCorrect
Correct
Vertical Flow
3