Page 24
5.2.2 Cleaning the Pump Head Assembly
NOTE: If you choose to remove the piston seal or self-flush seals, you should have a new set on hand to install after cleaning. It is not recommended that you reinstall used piston or self-flush seals since they are likely to be scratched and damaged during removal and would not provide a reliable seal if reused. If you decide to remove the seals, use only the flanged end of the plastic seal removal tool supplied with the seal replacement kit and avoid scratching the sealing surface in the pump head. See Section 5.2.3 for seal replacement instructions.
1.Inspect the piston seal cavity in the pump head. Remove any foreign material using a cotton swab, or equivalent, and avoid scratching the sealing surfaces. Repeat for the self-flush housing. Be sure no fibers from the cleaning swab remain in the components.
2.The pump head, check valves, and self-flush housing may be further cleaned using a laboratory grade detergent solution in an ultrasonic bath for at least 30 minutes, followed by rinsing for at least 10 minutes in distilled water. Be sure that all particles loosened by the above procedures have been removed from the components before re- assembly.
CAUTION: When cleaning check valves, be sure that the ball is not against the seat in the ultrasonic bath. This may destroy the precision matched sealing surface and the valve will not check.
CAUTION: If removing the check valves, keep them in the orientation shown below the entire time they are not installed in the pump head. The assemblies may fall apart, parts may be lost, and they may not operate properly when re-assembled.
7-5
Contents
Binary Solvent Delivery Module
Operators Manual
Page
1.INTRODUCTION
1.1.1 Pump Features
fFast & easy setup
1.1.2 Wetted Pump Materials
1.1.3 Self-FlushingPump Head
Microprocessor advanced control
1.1.4 Self-Flushand Seal Life
It is recommended that the Self Flush feature be used to improve seal life in a number of applications. In particular, as stated above if pumping Buffers, Acids/Bases or any inorganic solution near saturation, the pump should utilize the Self Flush feature. With every piston stroke, an extremely thin film of solution is pulled back past the seal. If this zone is dry without use of Self Flush, then crystals will form with continuous operation, which will ultimately damage the seal
Flow Rates
2.INSTALLATION
2.1Unpacking and Inspection
2.2Location/Environment
2.3Fluid Connections & Priming
SELF-FLUSH
PUMP
Connect wash solution inlet and outlet tubing
opaque to the flush housing as shown
2.5.1 Solvent Out-gassingand Sparging
2.4Electrical Connection
2.5Solvent Preparation
2.6.1Mobile Phase Reservoirs
2.5.2 Cavitation
2.5.3 Filtration
2.5.4 Initial system pressurization Daily
2.6.2 Self-FlushSolution
2.6.3 Inlet Tubing and Filters
2.6.4 Priming the Pump and the Flushing Lines
2.6.6 Long Term Pressure Calibration Accuracy
2.7.1Isopropanol Flush
2.7.2 Packaging for Shipping
2.7Preparation for Storage or Shipping
3.OPERATION
3.1.1Control Panel
Non-volatileMemory Reset If the pump is operating erratically, there is the possibility that the memory has been corrupted. To reset the memory and restore the pump to its default parameters, press and hold the UP-ARROWbutton when the power is switched on. Release the button when the display reads rES. The parameters stored in non-volatilememory, i.e., the flowrate, the pressure compensation, the voltage/frequency select, the lower pressure limit, and the upper pressure limit will be set to the factory default values. The head type setting is the only parameter not changed by the non-volatilememory reset function. If the firmware is upgraded to a newer version, a non- volatile memory reset will automatically occur the first time the power is switched on
3.6Symbols
3.5Rear Panel Remote Input
4.THEORY OF OPERATION
4.1.1Liquid System Flow Path
4.1.2 Pump Cycle
4.1.3 Pulse Damping
4.2.2 DC Power Supply
4.2.1 Microprocessor Control
4.2.3 Remote Interfacing
4.2.4 Motor Stall Detector
Page
5.MAINTENANCE
5.1.1 Inlet Filters
5.2.1Removing a Pump Head
5.1Filter Replacement
3.Remove the inlet line from the inlet check valve
OUTLET FLUSHING CHECK VALVE
OUTLET FLUSHING
5.2.2 Cleaning the Pump Head Assembly
1.Inspect the piston seal cavity in the pump head. Remove any foreign material using a cotton swab, or equivalent, and avoid scratching the sealing surfaces. Repeat for the self-flushhousing. Be sure no fibers from the cleaning swab remain in the components
3.If the check valves have been removed, tighten the check valves on stainless steel pumps to 75 inch-poundsor enough to seal at maximum pressure. Do not exceed maximum torque. For Bioclean PEEK pumps, tighten each check valve firmly by hand. Do not go ¼ turn past finger tight
5.2.3 Replacing Piston Seals
Lower than normal pressure, pressure variations, and leaks in the pumping system can all indicate possible problems with the piston seal. Depending on the fluid or mobile phase used, piston seal replacement is often necessary after 1000 hours of running time
1.Remove the pump head as described in Section 5.2.1. Use caution so as not to damage the sapphire piston
5.2.4 Changing the Piston
5.Condition the new seal as described in Section
5.2.5Replacing the Pump Head
5.3Conditioning New Seals
5.5.1Removing the Pulse Damper
5.5.2 Pulse Damper Refurbishing
5.4Check Valve Cleaning and Replacement
5.5Pulse Damper Replacement
5.5.3 Pulse Damper Installation
5.6Cleaning the Pump
5.8Other Pump Maintenance
5.7Lubrication
7-14
5.9Fuse Replacement
1.Unplug the unit 2.Remove the cover
6.PROBLEM SOLVING
Quick Guide to Problem Solving
You Notice
This May Mean
7.LIST OF REPLACEMENT PARTS
880201 Seal Kit, Aqueous, 5mL
APPENDIX A
A.1.1 Hardware Implementation
Part Description
Part Number
Command Interpreter
A.1.3
“/” character
Page
A.2.1 Pressure Fault and Motor Stall Fault Output
A4-pinterminal board connector and a 10-pinterminal board connector are provided on the back panel. Any device capable of providing the proper run/stop logic level, flowrate control frequency, or flowrate control voltage can be used as a remote controlling device for pump operation via this connection. The terminal board connectors can be removed for ease of connecting wires, if desired, by pulling firmly rearward and should be reinserted firmly afterward
A.2.2 General Information on Inputs
the EVENT 1 terminal and the EVENT 2 and EVENT 3 terminals is affected. EVENT 2 is Normally Closed connected to EVENT 1 until a fault occurs and then opens. EVENT 3 is Normally Open not connected to EVENT 1 until a fault occurs and then closes
A.2.4 Run and Stop Inputs
The PUMP-RUN, PUMP-STOP,and ENABLE IN inputs operate from an internal 5 VDC source and each one draws approximately 0.008 amps when connected to COM. To activate either the PUMP- RUN, PUMP-STOP,or ENABLE IN input connect it to COM. Any device capable of switching 0.008 amps can be connected between the PUMP-RUN, PUMP-STOP,or ENABLE IN input and COM, such as: a switch contact, a relay contact, an open collector output, an open drain output, or any output with a high logic level output of 3.8 to 6.0 volts and a low logic level output of 0.0 to 0.5 volts. A switch contact or a relay contact is preferred since this type of connection will provide isolation between the pump and the controlling device. The COM terminal is internally connected to the pumps chassis ground and should be connected to the controlling devices ground or zero volt terminal when the controlling device has an open collector output, an open drain output, or any output with logic level output
A.2.4 Enable Input
When activated ENABLE IN is at a low logic level, the ENABLE IN input disables flowrate control on the front panel and enables flowrate control on the back panel
APPENDIX B
EZ GRIP FITTING GUIDE
Scientific Systems Inc Warranty Statement
A-10
