Teledyne 3220 - Multi-channel oxygen monitor system User Manual

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1 Introduction

Model 3220

Teledyne Analytical Instruments

• 1MAN calibration capability
• Membrane switch control
• Microprocessor based electronics
• Two concentration alarms with adjustable set-points
• System failure alarm
• User-friendly touch key controls
• Passcode protection
• Failure codes and testpoints
• Two selectable analog outputs (0-10V DC or negative ground

4-20 mA DC

• Compact and versatile design: small footprint with accessible

internal PCBs

1.2.4 Remote Probe Assemblies

Each Control Unit allows for up to eight remote probe assemblies.

These assemblies can be of standard configuration (see Probe Assembly
Outline Drawing in the drawing section of the Appendix) or special design
(if equipped, unique features are described in an included addendum to this
manual) depending on the application requirement. In either case, the
probes can be located almost any distance (up to 1000 ft or more!) from the
System Chassis.

Each probe assembly, when placed into service, will contain a Micro-

fuel Cell, a temperature compensating thermistor and auxiliary sample
handling equipment (if required). The Micro-fuel Cell is packaged in a gas
barrier bag and should not be installed in the probe assembly until after
installation of all other components of the system has been accomplished.

Temperature compensation is affected over the range 0-50°C and to an

accuracy of ±5% of full scale. If other than diffusion sampling is to be
employed, it is assumed that the sample gas will be brought to ambient
temperature. The cell and thermistor must always be kept at the same
temperature, otherwise the resultant differential temperature of these two
components can cause inaccuracies in excess of those specified.

If the ambient temperature at the probe assembly can drop below 0°C

(32°F), auxiliary heating should be employed. Normally this condition is
noted at the time of purchase and specially configured probes will have
been provided. TAI can provide sampling probes to cope with most all