Teledyne 3160 manual Operations

Operations 4

When waiting for manual sensor settling during calibration zeroing, wait until the oxygen concentration has reached its lowest value and has remained so for 10–15 minutes. It is important to make sure that the sensor is reading the lowest possible value, since zeroing will reset the point at which the sensor reads zero. Do not zero prior to reaching the lowest possible oxygen concentra- tion. When initially installing the sensor(s), do a zero calibration, then a span calibration. If desired, the instrument may be programmed for automatic periodic zeroing (AutoZeroing) if the optional scrubber is installed. AutoZero- ing uses the scrubber to generate a zero gas from a low O2 sample gas.

NOTE: 1. Zeroing in the 0-1 PPM range preserves the life of the scrubber.

In scheduled zeroing and spanning (AutoZeroing and AutoSpanning), a time interval must be chosen. This interval determines how often the instru- ment zeros or spans itself. To change the scheduled time, edit it after setting the interval in the Set Up Clock Functions mode.

NOTE: 2. AutoZeroing and AutoSpanning may be delayed until the alarms have been enabled.

Calibration Using Span Gas: After zeroing, the instrument can now be calibrated using a span gas with a known oxygen concentration. The analyz- er may be calibrated on any range other than 0–1 PPM, but it is best to cali- brate one range up from the range where the sample is expected to be. The span gas concentration should be within 70% to 99% of full scale of the range selected.

NOTE: 3. Prior to calibration, allow the analyzer reading to come to a stable value with zero or sample gas flowing through the analyzer.

Select Active Sensor (Two cell blocks only): One or two O2 sensor blocks can be installed in the system. In dual sensor systems, either sensor can be isolated with pneumatic valves, and the other sensor chosen as the active sensor for O2 measurements. The system software is aware of how many sensor blocks are present, but will not automatically switch sensors should one fail.

This menu will not appear if only one cell block is installed.

Install Sensor and Test Alternate Sensor (Two cell blocks only): Pro- cedures are provided for installing a new sensor and for testing the alternate O2 sensor.

This menu will not appear if only one cell block is installed.

O2 Range Set-Up:The measurement range may be manually chosen, or the system may be set to automatically choose the range (AutoRanging). In the AutoRanging mode, the range will step up at greater than 100% and step down at 80% of full scale of the current range. The analyzer is programmed to prevent oscillation between ranges during rapidly changing oxygen levels.

TELEDYNE ANALYTICAL INSTRUMENTS 4-3