Teledyne MD300 - Oxygen analyzer and monitor (Diving) - Manual (Page 10)

Introduction AD300/MD300
Teledyne Analytical Instruments 10
Figure 1-2: AD300 Front View
The LCD display consists of up to 3.5 characters plus a decimal
point indicator capable of displaying up to 105%. (See Section 1.2
Options for alternate display configuration). An integral battery life
indicator is displayed continuously on the AD300 and ―on demand‖
with the MD300.
The instrument is powered by three AA alkaline batteries and is
designed to operate for 2000 hours in Non-alarm State.
Oxygen analysis is linear across the single range of 0-100% using
Teledyne’s class R17S oxygen sensor. A unique sensor failure alarm is
incorporated which warns the user if the sensor signal is lost or low.
When this occurs, the √ SENSOR display flashes. The alarm buzzer can
be silenced by pressing the ALARM SILENCE key. If the alarm
condition is not corrected within 115 seconds the alarm buzzer will
reactivate.
The MD300 unit incorporates a dual concentration alarm with
individual user-defined set points. The set points are displayed on the
lower portion of the LCD display with the low alarm set point appearing
at the lower left and the high alarm appearing on the lower right of the
display. The alarm circuitry provides both an audible and visual alarm.