Pulsafeeder Pulsa GLM DM7 - Manual (Page 5)

5
2.1 Reagent Head Assembly
The typical reagent head assembly consists of reagent head, diaphragm, and
suction and discharge cartridge check valves. This assembly is the only part of the
pump to contact the process liquid; consequently, maintenance is critical to pump
performance.
2.2 Control Assembly
The GLM ® DM7 pump incorporates a full motion style of stroke length adjustment.
The stroke length setting is indicated by a (0% – 100%) scale located on the stroke
adjustment assembly.
Stroke length is changed by loosening the locking screw and turning the hand knob.
This turns a mechanism, which changes the amplitude of the stroke length. As the
stroke adjustment knob is turned towards 100%, it displaces the cam eccentrically
to the rotating drive shaft. This in turn causes the pushrod and diaphragm to travel
over a longer distance. Refer to Section 6.2 for further information.
For automatic flow rate control, users can consider the Pulsafeeder MPC speed
based control system, please contact your local Pulsafeeder dealer or representative
for more information.
2.3 Gear Ratio Assembly
GLM ® DM7 pumps are driven by an electric motor mounted on the motor adaptor input
flange. The motor drives a set of worm gears that convert rotational speed into torque.
They, in turn, power the eccentric shaft assembly that converts rotary motion into
reciprocating motion. The gear assembly and eccentric shaft run submerged in a
lubricating oil bath.
Figure 2, isometric view