Teledyne 4020 - Hydrocarbon analyzer - Manual (Page 69)

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 or AUTO: Manually (MANUAL)or automatically
(AUTO) select the concentration range of analysis.
 DGTL: Use the 24 VDC remote zero and remote span inputs
to select the range.
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.