Table of Contents
Advertisement
2
Operation
Helium probe hardware errors
Thermal sensor hardware errors
Gas Heater hardware error
22
The E5080 tests the continuity of the heater current path
within the helium probes only when a particular probe is
active.
Normally the helium liquid level is measured three times per
day, at 01:00 hrs, at 09:00 hrs and at 17:00 hrs, all being
with respect to the internal real- time clock of the unit. If a
hardware error is detected, it is stored and will be displayed
as an error message indicating a helium probe hardware
error, together with which channel is in error. This error
will not be cancelled until the next level measurement is
made, 8 hours later. This does not apply when the unit is
operating in helium fill mode, during which time the
probe(s) is tested every read, being approximately at one
minute intervals.
The E5080 tests the continuity of the thermal sensors during
each measurement cycle, for example, every three or so
seconds. If when tested, a hardware error is detected, it is
stored and is displayed as an error message indicating a
thermal probe hardware error, together with which channel
is in error.
The E5083 tests the continuity of the gas heater resistive
element every few seconds when the heater is energized.
During a period when the heater is off, a fault is not
detected until the heater is next energized.
In normal use the gas heater cycles continuously and
changes state On to Off several times during an hour.
E5080 Series Cryogen Monitor User Guide
Advertisement
Table of Contents
