Teledyne 3010TAC - Split architecture trace oxygen analyzer (EU - CENELEC) User Manual

Page 53

Oxygen Analyzer

Part I: Control Unit

Part I: 4-19

Teledyne Analytical Instruments

range limits are exceeded, the instrument will automatically shift to the next
higher range. If the concentration falls to below 85% of full scale of the next
lower range, the instrument will switch to that range. A corresponding shift
in the DC percent-of-range 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 oxygen concentration detected. If the
concentration 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 concentra-

tion are unaffected by the fixed range. They continue to read accurately with
full precision. See Front Panel description in chapter 1.

The automatic air calibration range is always 0-25 % and is not pro-

grammable.

4.6.1 Setting the Analog Output Ranges

To set the ranges, enter the range function mode by pressing the

Range

button on the front panel.

L—### M—####
H—##### Mode—AUTO

Use the < > arrow keys to blink the range to be set: low (L), medium

(M), or high (H).

Use the

∆∇

arrow keys to enter the upper value of the range (all ranges

begin at 0 ppm). Repeat for each range you want to set. Press

Enter

accept the values and return to

Analyze

mode. (See note below.)

Note: The ranges must be increasing from low to high, for example,

if range 1 is set as 0–100 ppm and range 2 is set as 0–1,000
ppm, range 3 cannot be set as 0–500 ppm since it is lower than
range 2.

Ranges, alarms, and spans are always set in ppm units (over the entire

0-250,000 ppm range), even though all concentration-data outputs change
from ppm units to percent when the concentration is above 10,000 ppm.

4.6.2 Fixed Range Analysis

The autoranging mode of the instrument can be overridden, forcing the

analyzer DC outputs to stay in a single predetermined range.