Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 170)

Model 9110TH NOx Analyzer Operating Instructions
Teledyne Analytical Instruments 150
Table 4-29: Status Output Pin Assignments
CONNECTOR
PIN
STATUS CONDITION (ON=CONDUCTING)
1 SYSTEM OK ON if no faults are present.
2 CONC VALID ON if concentration measurement is valid, OFF when invalid.
3 HIGH RANGE ON if unit is in high range of any AUTO range mode.
4 ZERO CAL ON whenever the instrument is in ZERO calibration mode.
5 SPAN CAL ON whenever the instrument is in SPAN calibration mode.
6 DIAG MODE ON whenever the instrument is in DIAGNOSTIC mode.
7 LOW RANGE ON if unit is in low range of any AUTO range mode.
8 Unused.
D EMITTER BUS
The emitters of the transistors on pins 1-8 are bussed together. For
most applications, this pin should be connected to the circuit ground
of the receiving device.
+ DC POWER + 5 VDC, 30 mA maximum (combined rating with Control Inputs).
DIGITAL
GROUND
The ground from the analyzer’s internal, 5 VDC power supply.
4.15.1.2. Control Inputs
Control inputs allow the user to remotely initiate ZERO and SPAN calibration modes
are provided through a 10-pin connector labeled CONTROL IN on the analyzer’s rear
panel. These are opto-isolated, digital inputs that are activated when a 5 VDC signal
from the “U” pin is connected to the respective input pin.
Table 4-30: Control Input Pin Assignments
INPUT STATUS CONDITION WHEN ENABLED
A
EXTERNAL ZERO
CAL
Zero calibration mode is activated. The mode field of the display
will read ZERO CAL R.
B
EXTERNAL SPAN
CAL
Span calibration mode is activated. The mode field of the display
will read SPAN CAL R.
C
EXTERNAL LOW
SPAN CAL
Low span (mid-point) calibration mode is activated. The mode field
of the display will read LO CAL R.
D, E & F Unused
DIGITAL GROUND Provided to ground an external device (e.g., recorder).
U
DC power for Input
pull ups
Input for +5 VDC required to activate inputs A - F. This voltage can
be taken from an external source or from the “+” pin.
+ Internal +5V Supply
Internal source of +5V which can be used to activate inputs when
connected to pin U.