Armfield PCT40 - RCD Test; Calibration of the Sensor Conditioning Circuits

Routine Maintenance
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Note: Before attempting to replace the flexible tubing in either peristaltic pump head,
ensure that the equipment has been switched off to prevent inadvertent rotation of
the rollers.
Before installing the flexible tubing ensure that the adjusters on either side of the
pump head (at the bottom) have been set to the diameter of tube in use. (The
standard tubing supplied with PCT40 has a bore of 6.3mm and the tubing supplied
with PCT41 has a bore of 3.2mm so the indicator must align with the 6.4 mark or the
3.2 mark as appropriate when the head is unclamped.) To install or replace the
flexible tubing lift the clamp (on the top of the pump head) upwards and backwards to
expose the rotor. Load the tubing into the slot between the rotor and pump head then
close the pump head by pushing the clamp forwards and downwards. The clamp will
click shut. The tube will retain its elasticity for many hours of use but there is
sufficient length to allow the tube to be moved to other positions of less wear. It is
essential to release the clamp when the equipment is not being used to prevent
permanent deformation of the tube.
RCD Test
Test the RCD by pressing the TEST button at least once a month. If the RCD button
does not trip when the Test button is pressed then the equipment must not be used
and should be checked by a competent electrician.
Calibration of the sensor conditioning circuits
Zero and Span potentiometers for the sensor conditioning circuits are grouped
together at the right hand end of the bottom moulded plinth section. These controls
can be accessed by removing the small cover plate. The location of the
potentiometers is shown on a diagram attached to the rear of the cover plate. The
diagram is included below for information.
Note: The software supplied with the PCT40 includes the ability to recalibrate each
of the sensors if necessary. Small changes in calibration should therefore be made
using the software. Re-calibration using the potentiometers should not therefore be
necessary unless a large change is required such as following the replacement of a
sensor etc.