Watson-Marlow 504S - Manual (Page 4)

4
• Check that the power switch is on.
• Check the mains supply is available at the pump unit.
• Check the voltage selector switch is in the correct position.
• Check the fuse in the mains socket.
• Check that the pump is not stalled by incorrect fitting of tubing.
Manual operation
• Start up direction Start the pump by turning the Forward/Off/Reverse switch to the required direction of rotation. The
preferred direction of rotation is clockwise (with fluid entering at the bottom of the right of the pumphead), which will ensure
the longest possible tube life. To operate against higher pressures, use anticlockwise rotation.
• Prime To prime the pump at maximum speed turn the Auto/Manual/Max switch on the front panel to its Max position.
When released the switch will return to its Manual position.
• Speed control The speed setting dial is calibrated in percentage of maximum speed and has a locking knob to prevent
accidental speed changes.
• Stop Stop the pump by turning the Forward/Off/Reverse switch to its central Off position. To change the direction of flow,
turn the Forward/Off/Reverse switch to its central Off position until the pumphead rotor stops, and turn it to the required
direction of rotation.
If returning from auto control to manual control, it is not necesssary to disconnect the process signal from the pump or adjust the
calibration potentiometers.
Care and maintenance
The only scheduled maintenance of the pump unit is to inspect the motor brushes and to replace them before their length is less
than 10mm. The life of the brushes depends on the duty of the pump but is expected to be at least 4,000 hours at maximum
speed.
If the pump requires cleaning use a mild solution of detergent in water after removing the pumphead. Do not use strong solvents.
For gearbox rebuilds, use 15ml of the recommended lubricant RD-105. This is a SAE 30 mineral oil loaded with molybdenum
disulphide to form a soft fluid grease.
Specification
Maximum rotor speed 55rpm, 220rpm
Shaft torque 2.2Nm
Control range 100:1
Voltage/frequency 100-120/220-240V 50/60Hz
Power consumption 100VA
Operating temperature range 5C to 40C
Storage temperature range -40C to 70C
Noise <70dB(A) at 1m
Weight 8.0kg
Standards IEC 335-1, EN60529 (IP55)
Machinery Directive 98/37/EC EN60204-1
Low Voltage Directive 73/23/EEC EN61010-1
EMC Directive 89/336/EEC EN50081-1/EN50082-1
Specific drive performance details such as loaded drive speed variation against mains supply voltage fluctuation and drive
stability from a cold start to normal operating temperature are available on request. For further information please contact
Watson-Marlow Technical Support Department.
501RL Pumphead
The 501RL pumphead has two spring-loaded working rollers, which automatically compensate for minor variations in tubing
wall thickness, giving extended tube life. The 501RL is set during manufacture to accept tubing with wall thicknesses of between
1.6mm and 2.0mm, and internal diameters of up to 8.0mm. It is equipped with a "tool lockable" guard for increased safety. This
should be locked shut whilst the pump is in use.
The pumphead can be run clockwise for extended tube life, or anti-clockwise to operate against higher pressures.
Flow rates
Flow rates for the 504S were obtained using silicone tubing with the pumphead rotating clockwise, pumping water at 20C with
zero suction and delivery pressures. For critical applications determine flow rates under operating conditions.