Teledyne T101, Operation Manual, Page: 41 / 375

Teledyne ML – T101 Operation Manual Getting Started
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Table 3-5. Status Output Signals
REAR PANEL
LABEL
STATUS
DEFINITION
CONDITION
1 SYSTEM OK ON if no faults are present.
2 CONC VALID
OFF any time the HOLD OFF feature is active, such as during calibration
or when other faults exist possibly invalidating the current concentration
measurement (example: sample flow rate is outside of acceptable limits).
ON if concentration measurement is valid.
3 HIGH RANGE ON if unit is in high range of the AUTO Range Mode
4 ZERO CAL ON whenever the instrument’s ZERO point is being calibrated.
5 SPAN CAL ON whenever the instrument’s SPAN point is being calibrated.
6 DIAG MODE ON whenever the instrument is in DIAGNOSTIC mode
7 - 8 SPARE
D EMITTER BUS The emitters of the transistors on pins 1-8 are bussed together.
SPARE
+ DC POWER + 5 VDC, 300 mA source (combined rating with Control Output, if used).
Digital
Ground
The ground level from the analyzer’s internal DC power supplies
3.3.4. CONNECTING THE CONTROL INPUTS
If you wish to use the analyzer to remotely activate the zero and span calibration modes,
several digital control inputs are provided through a 10-pin connector labeled CONTROL
IN on the analyzer’s rear panel.
There are two methods for energizing the control inputs. The in5V available from
the pin labeled “+” is the most convenient method. However, if full isolation is required,
an external 5 VDC power supply should be used.