Gilson Company, Inc.
Concrete Compression Testing Machines: MC-250CS, MC-300CS, MC-250CP & MC-300CP
Page 8
6.6 Sequence of Operation
1. With Pump Motor switched off, carefully center
specimen in testing machine.
2. Turn Control Knob No. 2 clockwise to a snug posi-
tion. Never over tighten. (If Knob No. 2 has already
been adjusted as in section 6.1, this step may be
skipped until a specimen of different size is tested.
3. Position Valve Control Handle No. 1 to a “metered
advance” position.
4. Switch on pump motor.
5. If a preload of the specimen is desired, position
Valve Control Handle No. 1 to “full advance”.
Cau-
tion is required to avoid overload or failure of
the specimen.
6. Watch the display closely. When the desired pre-
load has been attained, move the Valve Control
Handle No. 1 to the “metered position”.
7. To increase the rate of loading, turn Control Knob
No. 2 counter-clockwise. To decrease the rate of
loading, turn Control Knob No. 2 clockwise.
8. To hold pressure at any desired point, position Valve
Control Handle No. 1 to the “hold” position.
9. To release pressure so that the platen will return af-
ter a test has been completed, position Valve Con-
trol Handle No. 1 to the “retract” position.
10. For repetitive testing of identical specimens, Control
Knob No. 2 can be preset with a stopwatch, then
locked in position by tightening the thumbscrew lo-
cated beneath the knob.
6.7 Maintenance & Safety Precautions
6.7.1 Hydraulic Pump & Flow Control Valve
This two-stage hydraulic pump incorporates precision
design and engineering features. Peak efficiency for ei-
ther continuous or intermittent operation is assured at
the full range of pressures up to 10,000 psi. You will
have uninterrupted, trouble-free service if you keep it
clean and free of dust.
6.5 Figure 1: Control Valve
CONTROL VALVE
Figure 1
