Teledyne TED-200 - Medical application oxygen monitor - Manual (Page 15)

Operations 2
2-5 Teledyne Analytical Instruments
2. If calibrating for the first time, press the CAL key once. After initial
calibration, press the CAL key twice.
CAUTION: It is very important that air (21 % oxygen) calibration be
performed every time the batteries are disconnected or
replaced in the TED 200-T. The microprocessor cannot
perform its task properly without this data.
After 10 seconds a reading of 20–22% oxygen will be displayed. CAL IN 100%
will flash for a period of 5 seconds, during which time the reading of 20–22 will con-
tinue. This is a reminder that a 100% oxygen calibration should be performed to
achieve maximum accuracy.
Note: When calibrating in 100 % oxygen, it is recommended that the plastic
flow diverter and tee adapter be installed into a flowing circuit with pure
dry oxygen flowing past the sensor assembly. An accessory calibration
assembly (P/N C53790) is available from TET Sensor Technologies for
use where breathing circuits are not normally used.
3. Place the sensor in 100% oxygen (place the sensor in a small plastic bag and
flush with pure, dry oxygen) and allow the reading to stabilize. Wait until the
reading is stable for at least 10 seconds. If the reading is other than 100, press
the CAL key twice. After 15 seconds a reading of 99–101 will display.
Note: For the specified accuracy in monitoring any oxygen level above 30–40%,
a 100% calibration must be performed after the 21% (air) calibration. DO
NOT calibrate in air subsequent to the 100% calibration, as calibrating in
air again will cancel the previous 100% calibration. The 100% calibration
may be repeated as many times as desired without affecting the air
calibration.
It is important to perform the calibration carefully and thoroughly, making certain
that uncontaminated calibration gases are used and that stable readings are achieved
before the calibration is locked in. The accuracy achievable by the monitor is only as
good as the procedure used to calibrate it.
Note: Never calibrate the unit in humidified gas, as water vapor makes the
oxygen concentration appear lower than it really is. See Appendix:
Humidity.
2.1.4 Alarms
1. To set the HI alarm: Press the SET HI ALARM key once. Within 5 seconds,
press the yellow UP or DOWN arrow keys until the screen displays the
desired value.