Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 71)

Total Hydrocarbon Analyzer Operation
Teledyne Analytical Instruments 53
<Enter> Press to move to the setpoint field.
<▲▼> Use the UP/DOWN keys to increase or decrease the
value of the setpoint.
<Enter> Press to accept the setpoint value and move to
the next alarm function.
4.6.13 The Range Function
The RANGE function allows you to:
 MANUAL: Manually change the range of analysis as
needed.
 AUTO: Automatically (AUTO) select the concentration
range of analysis.
In the MANUAL screen, you are further allowed to define the low
(concentration) limits of each range, and select a single, fixed range to
run.
CAUTION: IF THIS IS A LINEARIZED APPLICATION, THE NEW
RANGE MUST BE WITHIN THE LIMITS
PROGRAMMED USING THE LINEARIZATION
FUNCTION, IF LINEARIZATION IS TO APPLY
THROUGHOUT THE RANGE. FURTHERMORE, IF
THE LIMITS ARE TOO SMALL A FRACTION OF THE
ORIGINALLY LINEARIZED RANGE (APPROX 10 %
OR LESS), THE LINEARIZATION WILL BE
COMPROMISED.
4.6.13.1 M ANUAL (S ELECT /D EFINE R ANGE ) S CREEN
The Manual range-switching mode allows you to select a single,
fixed analysis range. It then allows you to redefine the upper and lower
limits, for the range. To enter a MANUAL or fixed range:
<▲▼> Scroll to the Range function using the UP/DOWN keys.
<Enter> Press to activate the RANGE function.