Teledyne 4040 - Methane / Nonmethane analyzer - Manual (Page 63)

Operation
Teledyne Analytical Instruments 63
RANGE LIMITS: Ranges may be set as low as 50.0 ppb and as
high as 1000.0 ppm. Range 3 can only be set at a value greater than
Range 2. Range 2 can only be set at a value greater than Range 1.
4.15 Changing Stream
Affects the relay on the rear panel that controls which gas is allowed
to flow to the column and detector.
When the instrument has electronically controlled calibration valves,
the gas stream can be switched here. You can set the incoming gas
source to span, sample (or zero gas, which is nothing more than a 3
rd
source of gas) without entering the calibration mode in order to check
instrument response. During a span calibration, the span stream is
activated. After a span calibration, the stream reverts to whatever was
set before the span. This value is not remembered if the power in cycled
on the unit, the analyzer will default to the analyze stream.
4.16 Analog output Adjustment
The software in this instrument provides a way to enter to manage
the analog output of the analyzer FOR ANALOG CHANNEL 1
ONLY. To access the offset function:
<▲▼>
From the MAIN MENU, scroll to the ANALOG
ADJUST function using the UP/DOWN keys.
<Enter> Pressing activates the function and takes you to
the next screen.
ANALOG-OUT ADJUST
-----------------------
CH1 Offset: 0
CH1 Gain: 0
CH1 Select: CH4
CH2 Select: NMH
-----------------------
<Enter> Use the key to move over to the Offset field.
<▲▼> Use the UP/DOWN keys to change each digits value.
<Enter> Use the key to save the value.
<Escape> Use the key to revert to the original value.