2 General Description
2-10
Service Manual – Osmetech OPTI™ Analyzer
Then the valve turns to position 1 which connects the I/O port to the reservoir
and the cassette sensors to the vent via the waste. The pump starts pushing the
storage buffer into the waste. L1 and L2 monitor the movement of the buffer
and the pump rate. After the buffer is pushed into the waste, the valve turns to
position 4, which connects the I/O port to the reservoir and the sensors directly
to the vent. The pump first purges the cassette with calibration gas, then slows
down during the actual gas calibration passing the gravimetrically prepared gas
mix across the sensors. The pH sensor is calibrated via the precision storage
buffer. Calibration is completed when stable readings of all sensors are
obtained. The calibration process lasts from 15 to 80 seconds.
After calibration verification, the cassette valve turns to position 8 closing off
all ports. The instrument now waits for aspiration of sample fluid.
After pressing the
J
key, the valve turns to position 2, which connects the fill
port to the sensor channel and the reservoir to the I/O port via waste. The pump
starts aspirating the sample. During aspiration, the sample light gates L1 and L2
check for sample type (blood or clear fluid), bubbles and sufficient sample
volume.
Once the sample has been aspirated successfully, the valve turns again to
position 4. After a short warm-up period, readings are taken from all 3 sensors.
Once stable readings are obtained, the valve turns to position 8 closing off all
ports. The results are calculated and the cassette is ready for disposal.
In case of an OPTI-trol measurement (Osmetech OPTI 1 only), the user has the
option of terminating the measurement or introducing a subsequent blood
sample. If a blood sample is introduced, the OPTI-trol is purged into the waste
and the blood sample is aspirated and analyzed.
