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Macro 900 Operation Manual
V3
22. Appendix 2. Flow Through Cell
22.1. Introduction
The Palintest Flow Through Cell (Flowcell) is designed for use with any model of
Macro Accessory Probe and most third party pumping devices.
The Flowcell allows sample water to flow up through the probe, passing over all
the individual electrodes simultaneously. This eliminates air contact with
pumped samples from groundwater boreholes allowing truly representative
measurements to be obtained.
Made from marine grade aluminium and 6mm wall thickness acrylic, the
Flowcell is ruggedly constructed for hard use in the field. The base flange
includes four holes to allow the unit to be pegged down if necessary.
22.2. Spigot Installation
The Palintest Flowcell is supplied with two pairs of spigots, one pair to fit 6mm
(1/4") ID tube and one pair to fit 10mm (3/8") ID tube.
The spigots have a tapered thread so should be screwed into the inlet and
outlet holes of the Flowcell until they are tight. At this point, they should seal
due to the taper. If a spigot will not seal properly, remove it then re-insert with
some PTFE plumber's tape wrapped around the thread.
22.3. Probe Installation
The probe sleeve and protective Sleeve End
Cap must be fitted to the MAP.
Probe
Loosen the screw collar located at the top
of the Flowcell and slide the MAP in all the
way, ensuring it is properly seated in the
recess where the clear tube enters the
base. Tighten the collar to clamp the MAP in
place.
22.4. Operation
Connect the Flowcell to a pumping device
so that sample water enters at the bottom
and exits at the top. Adjust the flow rate so
that there is no visible turbulence or
cavitation within the Flowcell. Connect a
Macro 900 Meter and monitor the readings.
If the readings are jumpy or erratic, reduce
the flow rate. The ideal flow rate is around
30 litres/hour (8 US gallons/hour), although
the MAP is capable of operating at flow
rates as low as 15 litres/hour (4 US
© 2013 Palintest Ltd.
www.palintest.com
Page 135 of 147
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