Surface Temperatures; Single Element Probes; Protective Membranes - Cygnus 1 Ex Manual

flat and even. Most probes allow up to 1mm of re-facing before they are considered
unserviceable.

Surface Temperatures

Standard twin element probes must only be used on surfaces with a temperature
under 70°C (160°F).

Single Element Probes

Protective Membranes

All Cygnus single element probes have a soft face and therefore are fitted with a
Polyurethane Membrane which provides better contact on rough surfaces and
protects the probe face from wear, prolonging the life of the probe.
Check the membrane regularly as it is important the membrane is
changed as soon as it shows any signs of wear.
Cygnus 1 Ex Operating Manual
Fig 7. Single Element Probe Membrane Parts.
Page 25 of 91
Probe Body
Locking Ring
Polyurethane Membrane
Knurled Ring