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A-5
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.2.1.1 Upper and Lower Pressure Limit Range
(pump A only)
The pressure sensing transducer provides accurate, wide range
pressure monitoring. Because of the sensitivity of the transducer,
the zero reading may shift up to 0.1% of the full pressure scale
over years of operational use. The user should also be aware that
the resistance to flow of the fluid being pumped through the
tubing and fittings may cause the pressure to variy with the flow
rate and the viscosity of the mobile phase employed.
If absolute accuracy is needed for the pressure safety limits:
1. Disconnect the column from pumping system and operate the
pump with the mobile phase and flow rate to be used in the
analysis. Observe the resulting pressure displayed on the pump
readout. The column will cause a pressure reading that adds to this
basic reading due to system flow resistance.
2. Set the upper limit shut-off to a pressure equal to the basic
reading plus the safe operating pressure for the column to be used.
For example, if the basic pressure reading (without the column) is
7 PSI and the safe limit for the column is 25 PSI, set the maximum
pressure limit to 32 PSI or less.
3. If the mobile phase or flow rate is changed, reset the pressure
limit as appropriate.
4. Note that a lower pressure limit is available to prevent
continued operation in the event of a leak. For proper operation,
this must be set to a pressure higher than the basic pressure or it
may not sense the reduced pressure.
A.2.2 General Information on Inputs
The pump's inputs are on the 10-pin terminal board connector. The
pinout is: