Teledyne 6600 manual Oil in Water Analyzer Operation Set Range Screen

Oil in Water Analyzer Operation 3

3.8.1 The Set Range Screen

TheSetRangescreenallowsreprogrammingofthethreeanalysisranges and the calibration range (background gas, low end of range, high end of range, and % or ppm units). Original programming is usually done at the factory ac- cordingtothecustomer’sapplication.

Note: It is important to distinguish between this System program- ming subfunction and the Range button function, which is an operator control. The Set Range Screen of the System func- tion allows the user to DEFINE the upper and lower limits of a range AND the application of the range. The Range function only allows the user to select or define the limits, or to select the application, but not to define the application.

Normally the Model 6600 is factory set to default to manual range selec- tion,unlessitisorderedasasingle-applicationmultiple-rangeunit(inwhichcase itdefaultstoautoranging).Ineithercase,autorangingormanualrangeselection can be programmed by the user.

Intheautorangingmode,themicroprocessorautomaticallyrespondsto concentrationchangesbyswitchingrangesforoptimumreadoutsensitivity.Ifthe upperlimitoftheoperatingrangeisreached,theinstrumentautomaticallyshifts to the next higher range. If the concentration falls to below 85% of full scale of the next lower range, the instrument switches to the lower range. A correspond- ing shift in the DC concentration output, and in the range ID outputs, will be noticed.

The autoranging feature can be overridden so that analog output stays on a fixed range regardless of the contaminant concentration detected. If the concen- tration exceeds the upper limit of the range, the DC output will saturate at 1 V dc (20 mA at the current output).

However, the digital readout and the RS-232 output of the concentration are unaffected by the fixed range. They continue to read beyond the full-scale settinguntilamplifiersaturationisreached.Belowamplifiersaturation,the overrangereadingsareaccurateUNLESStheapplicationuseslinearizationover the selected range.

To program the ranges, you must first perform the four steps indicated at the beginning of section 3.8 Programming. You will then be in the second System menu screen.

ALGORITHM	APPLICATION
MODEL	OUTPUT: 4MA

Use the UP/DOWN switch again to move the blinking to APPLICATION and Enter.

Teledyne Analytical Instruments Part I 3-29