Chapter 4
Diagnostics
OsmoTECH XT Single-Sample Micro-Osmometer Service Guide
21
3.
After five minutes, the block temperature should
roughly equal the set point temperature.
NOTE:
Power level is expressed as a percentage,
indicating how much power the
thermoelectric cooler uses to reach a
temperature set point sensed by the block
probe. An increasing power level requirement
indicates deteriorating performance of the
cooling assembly.
4.
If you select
R5K
, the test runs with known resistor
values, (bypassing the cooling circuitry) to verify
that the A/D is operating correctly.
NOTE:
When testing in this mode, appropriate
readings should be the same as the 5K gold
values ± 50
Ω
. Readings outside this range
might point to issues with the A/D (see
Contacting Advanced Instruments
for
service contact information).
5.
If you select
R10K
, the test runs with known resistor
values, (bypassing the cooling circuitry) to verify
that the A/D is operating correctly.
NOTE:
When testing in this mode, appropriate
readings should be the same as the 10K gold
values ± 100
Ω
. Readings outside this range
might point to issues with the A/D (see
Contacting Advanced Instruments
for
service contact information).
6.
When you are finished working on this screen, press
Exit
to return to the Diagnostics menu.
4.3 Checking consumables status
The Consumables function allows you to check the
status of the instrument’s consumables (test kit).
NOTE:
The test kit must be positioned correctly on the
OsmoTECH XT for this diagnostic to function
properly (see
Placing the Micro-Sample Test Kit
).
1.
Press
DIAGNOSTICS > CONSUMABLES
to open the
Consumables status screen.
–
When the sampler tip count is between 100 (new
box) and 20, the Consumables screen shows the
current count of consumables and the Status field is
empty.
–
When the count is below 20, the Consumables
screen shows the current count of consumables in
yellow as a warning that the sampler tips are low.
The Status field displays the message
Replace AI
Consumable Box
.
–
When the system does not detect a test kit, the
current count of consumables is empty and the
Status field displays the message,
AI consumable
box not detected
. When this message appears, place
a new consumables box on the instrument to run a
test.
2.
Press
Exit
to return to the Diagnostics menu.
