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Introduction OT-3
Teledyne Analytical Instruments 2
The Model 3300/OT-3 Control Unit has its own long list of features
including:
• Keypad lockout feature
• Two user settable fail-safe alarms (with a user settable 0-20
min. time delay )
• Two user settable ranges (from 0-10PPM – 0-9999PPM)
with user selectable auto-ranging.
• Power fail alarm
• SSR power output (Solid State Relay power available on AC
control units)
• Micro processor based electronics 8 bit ADC & 18 bit DAC
• Large 3 ½ digit LED O2 concentration read-out
• 7 button user interface keypad
• Alarm condition indicator LED
• 100-240 VAC 50/60 Hz power (optional 9-36VDC )
• 0-10 VDC output
• 4-20 mA output
• 0-10 VDC range ID output
• Electronic temperature compensation
• Optional RS323 interface
• Accuracy: +/- 2% of range (at constant temp.)
• Response time: 90% in 65 sec of less @ 25 degrees C
• Temperature range (0-50 degrees C)
1.3 Front Panel Description
All controls are accessible from the front panel. See Figure 1-1.
The front panel has seven push-button membrane switches, a digital
meter, and an alarm indicator LED for operating the analyzer. These
features are described briefly here and in greater detail in Chapter 4,
Operation.