YSI Pro20 - Manual (Page 17)

MEMBRANE TYPE
Membrane Type sets the type of membrane used on the dissolved oxygen sensor;
either 1.25 PE (Yellow) or 2.0 PE (blue). Use the up or down arrow keys to
highlight Membrane Type and press enter to open the membrane submenu.
Highlight the membrane type corresponding to the membrane installed on the
sensor and press enter to confirm. The enabled membrane type will have an ‘X’ in
the box next to it. Use the down arrow key to highlight the ESC – Exit box and
press enter to save changes and to close the membrane submenu.
The dissolved oxygen sensor is supplied with membranes specific to the sensor
type ordered and are color coded as described in the following tables.
Galvanic Membrane Kits
Item Color Material Description
5913 Yellow 1.25 mil polyethylene Faster response time and less flow
dependence than traditional Teflon®
membranes
5914 Blue 2.0 mil polyethylene Less flow dependence than 1.25 mil
but somewhat slower response
Polarographic Membrane Kits
Item Color Material Description
5908 Yellow 1.25 mil polyethylene Faster response time and less flow
dependence than traditional Teflon®
membranes
5909 Blue 2.0 mil polyethylene Less flow dependence than 1.25 mil
but somewhat slower response
Selecting a Dissolved Oxygen Membrane
Membrane Type Flow Dependence After 4 Minutes Typical Response Time
to 95%
5913, 5908 - Yellow 25% 8 seconds
5914, 5909 – Blue 18% 17 seconds
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