Jenway 6715 - Manual (Page 156)

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Setting Up the Sipper Pump
There are three modes of operation:
1. independent 2. Segmented 3. Bi-Directional
1. independent
This is similar to the old continuous mode. Here operation of the sipper pump is via the switch on
the front of the accessory module. It can be switched on and off independently of the measurement
functions of the spectrophotometer.
This is the simplest mode of operation and can be used to take up samples from bulk containers or as
a bypass from a flow or pipeline.
Measurements may be made on the flowing sample using the auto-log function or the pump switched
off and measurement on the stopped flow be made manually on the instrument.
This mode is also useful for checking the cuvette and tubing for correct and leak free connection.
No other options are available with this mode selected.
2. Segmented
This mode uses the programmability feature to take up a controlled volume of each sample in a
sequential manner. This chain of sample segments can be broken up, by inserting an air (or wash) seg-
ment between each. If air (or wash) is not needed, this option is set to zero during calibration. This can
be controlled by using the switch on the front of the accessory module or the touch screen of the in-
strument, depending on the
Automatic Sip setting and the instrument measurement mode selected.
The sample always moves forward from the container to the waste receptacle.
3. Bi-Directional
This is identical to the segmented mode, but here the sample is returned to the original container, i.e;
pump direction is reversed during the drain sequence.
For draining a flow through cuvette:
note: Whilst using a 1.8 ml flow cell, order number 035 044 (quartz), the sample can only be drained
in Bi-Directional mode.
If you wish to drain the flow through cell between sample measurements in Independent or
Segmented modes it is recommended that you use a 80µl flow through cell; order numbers 035 045
(glass) and 035 047 (quartz).
Automatic Sip on/off
When Automatic Sip is set to On the measurement sequence is followed automatically once the
sample measurement is started. This is dependent on both the instrument and sipper mode with vari-
ous prompts and warnings displayed, as necessary. In general, the instrument controls will produce the
same effect as a press of the accessory pushbutton.
note: Measuring calibration standards using the sipper pump can only be performed when
Automatic Sip is set to On.
With Automatic Sip set to off the sipper will go through the sample handling process step-by-step
with each press of the accessory pushbutton.
In Kinetics mode when Auto Log is set to On readings will not be saved or printed until the sample
has been drained. In all other modes the result is printed before the drain cycle.