Teledyne 9110E - Nitrogen Oxides Analyzer - Manual (Page 90)

Operating Instructions Model 9110E Instruction Manual
76 M9110E Rev B
6.7.8. Flow Calibration
The flow calibration allows the user to adjust the values of the sample and ozone flow rates
as they are displayed on the front panel and reported through COM ports to match the
actual flow rate measured at the respective pneumatic ports. This does not change the
hardware measurement of the flow sensors, only the software calculated values. This is one
of the two parameters in the DIAG menu that is retained after you exit the menu. To carry
out this adjustment, connect an external, sufficiently accurate flow meter to the respective
test port (Chapter 11 contains more details on this setup). Once the flow meter is attached
and measures the actual flow, follow this key sequence:
SAMPLE RANGE = 500.0 PPB NOX=X.X
< TST TST > CAL
SETUP
SETUP X.X PRIMARY SETUP MENU
CFG ACAL DAS RNGE PASS CLK MORE EXIT
SETUP X.X SECONDARY SETUP MENU
COMM VARS DIAG
EXIT
Exit at
any time
to return
to main
the
SETUP
menu
DIAG SIGNAL I / O
NEXT ENTR EXIT
Exit returns
to the
previous menu
Repeat Pressing NEXT until . . .
DIAG FLOW CALIBRATION
PREV NEXT
ENTR EXIT
DIAG FCAL ACTUAL FLOW: 480 CC / M
0 4 8 0 ENTR EXIT
ENTR accepts the
new value and
returns to the
previous menu
EXIT ignores the
new value and
returns to the
previous menu
Adjust these values until
the displayed flow rate
equals the flow rate being
measured by the
independent flow meter.
DIAG FLOW SENSOR TO CAL: SAMPLE
SAMPLE OZONE
ENTR EXIT Choose between
sample and ozone
flow sensors.
SETUP X.X ENTER DIAG PASS: 818
8 1 8
ENTR EXIT
6.8. Digital Inputs and Outputs
6.8.1. Status Outputs
The status output signals report analyzer conditions through optically isolated transistors
which can sink up to 50 mA of DC current to ground. These outputs can be used with
interface devices that accept logic-level digital inputs, such as programmable logic
controllers (PLC).
NOTE
Most PLC devices have internal provisions for limiting the current that the output
can draw from an external device. When connecting the M9110E status outputs to
a unit that does not have this feature, a 120 Ω external pull-up resistors must be
used to limit the current through the transistor output to 50 mA or less. Refer to
the motherboard schematic 04069 in Appendix D.