M&C TechGroup MP47_D Operator's manual - Manual (Page 16)

16
Gas sampling and gas conditioning technology 6-1.1.1-ME
15 SUPPLY LINE CONNECTIONS
15.1 HOSE-/TUBE CONNECTIONS
The gas inlet and outlet hoses/tubes are connected on the top of the pump. Standard G1/4" threaded
joints are available for the connection of the gas sample lines.
N O T E !
The valve body must be fixed while mounting the fittings because moving
may change the pump capacity. Do not confuse hose-/tube connections for
sample gas inlet and outlet; the connections are labeled accordingly! Check
for tightness of all sample lines after connection! The tightness of the con-
nections can only be guaranteed if the end section of the connection
hose/tube is flat (use a hose-cutter)!
When connecting the sample gas supply hoses or tubes to the corresponding threaded connections,
pay attention to the following points:

Loosen the sleeve nut of the clamping-ring threaded joint by turning to the left. Take care that
the nut is removed carefully from the body of the threaded joint to avoid losing the clamping
ring which is mounted loose in the nut.

Push the sleeve nut over the connection hose/tube.

Push the clamping ring onto the connection hose/tube with the thicker bulge pointing to nut.

Push the hose/tube onto the supporting nipple in the threaded joint.

Tighten the sleeve nut by hand. The hose/tube is now mounted in such a way that it cannot
slip and is resistant to pressure.
The appropriate tube or hose threaded joint connections are available optionally from M&C.
16 START UP
Specific safety instructions for media being handled must be observed. Before pumping a medium,
the compatibility of materials of pump head, diaphragm and valves with the medium must be checked
(for pump materials: see technical data). The following steps should be carried out before initial start-
up:

The pump must not start against pressure or vacuum. When it is switched on the pressure in
the suction and pressure lines must be atmospheric. This must be so even when the pump re-
starts after the power has been cut off for a short period.

The maximum permissible operating pressure (see technical date) must not be exceeded,
even when the flow is restricted.

To prevent the maximum permissible operating pressure being exceeded, restriction or control
of the air or gas flow should only be carried out in the suction line.