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20 Model 7500 Instruction Manual
Teledyne Analytical Instruments
Terminal block 3 <TN3>
Between 1 – 4: For internal connection. Must not be
wired. (Must not be used as junction
terminal.)
Between 5 – 6: Remote hold input. No hold when open.
Output hold when short-circuited.
Between 7 – 8: Average value reset input. Short-
circuiting the contact input (for at 1.5 sec
or more) resets O2 average and O2
correction average simultaneously.
Opening it restarts the average value.
Between 9 – 10: Automatic calibration remote start
input. Open input after strapping for
at least 1.5 seconds starts the automatic
calibration whether automatic calibration
setting is ON or OFF.
Between 11 – 12: Conductive when analyzer unit error
is producted. Normally open.
Between 13 – 14: CH4 range identication signal
Between 15 – 16: CH3 range identication signal
Between 17– 18: CH2 range identication signal
Between 19– 20: CH1 range identication signal
Note: Range identication signal is conductive at Low range
or open at High range. In case of 1-range system, the signal
remains open.