Metek 920, Operator'S Manual With Essential Health And Safety Requirements

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Controller / User Interface | 4-15
RUN / CFG Mode – F1 Commands
Note the differences for the F1 • command in RUN and CFG modes.
The Auto-Setup is not used in RUN mode.
Keystroke Term Definition
F1
•
(RUN) — —
F1
•
(CFG) Auto-Setup The Auto-Setup optimizes PMT gains and the source lamp currents. Always initiate an
Auto-Setup after any lamps, optical filters, or PMTs have been installed or replaced. For
complete details about Auto-Setup and results, refer to the Auto-Setup information in
Chapter 5. This function is available in CFG mode only.
F1 – PTPara z Temperature zone parameters used only with systems using a heated probe (e.g., M&C
Probe or optional Heated Acid Gas Probe) with a dedicated temperature controller (con-
trolled by analyzer). This menu item displays a variety of temperature zone parameters,
where ‘ z ’ = 1..4. The parameters and their default values are:
1 = Probe temperature signal low scale for 0 V.
2 = Probe temperature signal high scale for full-scale V.
3 = Probe temperature low alarm set point.
4 = Probe temperature high alarm set point.
F1 0 KFtr
z
** Position of the key filter which gives the weakest signal for a given source lamp current,
where ‘
z
’ (1..2) is the filter being used.
1 = Measure Filter 1
2 = Reference Filter 2
F1 1 Ftr z ** The default source lamp pulse current-control signal (V) for each filter, where ‘ z ’ = 1..6.
The normal operating range is between 0.5 V and Lamp Max (LampMax typical range is
4.5–7.8 VDC – may vary, check EEPROM Data Sheets for actual value), with the control
signal for the key filter being Lamp Max. If the Ftr value is negative, the filter position is not
used.
1 = Filter 1 4 = Filter 4
2 = Filter 2 5 = Filter 5
3 = Filter 3 6 = Filter 6
Note: The filter positions assigned to each lamp will change, depending on the species
being measured, the lamp types, and the application. For the filter sequence
for your application, view the Bench Type code (press F2 1 in RUN mode) and
then refer to the Bench descriptions (see “F2 1” under “RUN/CFG Mode – F2
Commands” in this chapter).
F1 2 LmpB
z
** The base-current Set Point (V) for each source lamp, which is the minimum operating
current, where ‘
z
’ = 1..2.
1 = Lamp 1 (closest to the Measuring Cell)
2 = Lamp 2 (farthest from the Measuring Cell)
F1 3 LmpMax ** Voltage to which the lamp pulse current-control signal for the key filter location is set
during Auto-Setup. To ensure a PMT Level of 7.2–7.4 VDC after an Auto-Setup, the Lamp
Max typical range is 4.5–7.8 VDC.
F1 4 PmtLvl ** The photomultiplier tube (PMT) gain control signal (V), which is based on the signal from
the PMT when the key filter is in the light path. Normal values after a successful Auto-Setup
are from 7.2–7.4 VDC. If the PMT Level is not in this range, adjust the Lamp Max and start
another Auto-Setup.

NOTE