3 Test Programs and Diagnostics
3-2
Service Manual – Osmetech OPTI™ Analyzer
Temperature
The temperature diagnostic test displays three system-operating temperatures.
T1 displays the SMC top plate temperature, T2 displays the SMC lower plate
temperature and T3 displays the ambient temperature of the internal chassis and
is used for the fan control. Circuitry on the main board, optics module, and SMC
heater board provides temperature control for the analyzer. The following
specifications are required for proper operation:
T1 = 37.00
°
C
±
0.05
°
C
T2 = 37.15
°
C
±
0.05
°
C
T3 = Internal analyzer temperature
Adjustment of the temperature circuitry is described in Chapter 4, Adjustments.
Gas Pressure
The newly installed calibration gas cylinder contains a gas pressure of 140-psi
(9.7 bar) and is regulated and monitored by the gas module assembly. The gas
pressure sensor portion of the module provides gas pressure status to the
Osmetech OPTI 1 analyzer. If the gas bottle pressure falls below approx. 35 psi,
the switch closes (low pressure). The pressure needs to be above approx. 50 psi
for the switch to open (high pressure). This diagnostic test indicates HIGH
PRESSURE or LOW PRESSURE depending on the remaining gas cylinder
pressure. When this diagnostic test is completed, an additional screen is
displayed to allow replacement of the gas bottle and a gas purge sequence to be
initiated by the user.
Flow
Performing a flow test requires the use of a new cassette. The purpose of the
flow test is to check proper operation of the pump, gas module and to detect leaks
downstream from the pump.
At the end of the flow test, a pass/fail, as well as two flow numbers are displayed.
If the flow numbers are 99.99, this part of the test failed and no number could be
obtained.
Press
J
to start the test. First, the gas pressure is turned on (tubing upstream
from pump is pressurized). With the pump stopped, the fluid light gates L1 and
L2 check for the buffer to remain in the cassette. If the buffer is pushed out, the
test fails and the pump cartridge needs to be replaced.
Now the pump starts pumping slowly, while L2 is looking for the trailing edge of
the buffer. If the trailing edge is not detected within a certain time-out, the test
fails. Check for leaks downstream from the pump. Replace the SMC gas seal
and the pump cartridge receptacles.
