Part i: 3-11 – Teledyne 3010TB - Split architecture trace oxygen analyzer User Manual

Page 27

Oxygen Analyzer

Part I: Control Unit

Part I: 3-11

Teledyne Analytical Instruments

Figure 3-7 Remote Sensor Connector Pinouts

Figure 3-8: Remote Solenoid Return Connector Pinouts

The voltage from the solenoid outputs is nominally 0 V for the OFF

and 15 V dc for the ON conditions. The maximum combined current that
can be pulled from these output lines is 100 mA. (If two lines are ON at the
same time, each must be limited to 50 mA, etc.) If more current and/or a
different voltage is required, use relays, power amplifiers, or other matching
circuitry to provide the actual driving current.

Note that each individual line has a series FET with a nominal ON

resistance of 5 ohms (9 ohms worst case). This can limit the obtainable
voltage, depending on the load impedance applied. See Figure 3-9.

Figure 3-9: FET Series Resistance

Thermistor

Block

Sensor

Block

Thermistor 1

Thermistor 2

Sensor Return (-)

Sensor Hot (+)

Sensor Signal 8

Sensor Signal 2

Sensor Signal 1

Sensor Signal 7

Sample In

+15 V dc

Span (return)

Sample (return)

Zero (return)

+15 V dc

Exhaust (return)

+15 V dc

Exhaust

Zero In

Span In

Solenoid Valve 3

Solenoid Valve 4

Solenoid Valve 9

Solenoid Valve 10

Solenoid Valve 5

Solenoid Valve 6

Solenoid Valve n/a