Teledyne 514 - NDIR analyzer - Manual (Page 32)

4–2
4.0 Operations
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
1. POWER ON/OFF: This switch controls power to the analysis
section.
2. NORM/ZERO: NORM setting gives a local meter reading of
the peak-to-peak (P-P) voltage of the measuring or reference
signal, depending upon the mode setting of the MEAS/REF
switch.
ZERO setting allows the meter to display the voltage output of
the analysis section after comparing the logarithm of the
measuring and reference signals. This output is fed to meter
driver prior to conversion to a current signal for transmission to
the control module.
With zero fluid in the cell, the analysis section local meter
should read zero when the NORM/ZERO control is set to
ZERO. The setting of the MEAS/REF switch has no effect on
meter readout in the ZERO position of this switch.
3. MEAS/REF: selects either the measuring or reference peak
voltage to be fed to the local meter driver. The NORM/ZERO
switch must be in the NORM position; the reference peak
voltage should read 9±0.1 volts. With zero fluid in the sample
cell, the measuring peak voltage should be the same as the
reference peak voltage.
4. ZERO: potentiometer control allows an adjustment of the
analysis section output voltage to the E-to-I converter. The
ZERO control should be adjusted to give a zero reading when
zero fluid is in the sample cell.
5. Local Meter Readout: reads reference or measuring peak
heights, or voltage output from buffer amplifier before E-to-I
conversion.
4.1.2 General Purpose Version, Control Module
l. ZERO:control to adjust the control module to read zero output
when zero fluid is in the sample cell, i.e., fine zero.
2. SPAN: control to adjust the span calibration to make the control
module meter read the correct concentration of the span fluid.
3. POWER ON/OFF: This switch controls power to the control
module.