Remote Sensor And Solenoid Valves - Teledyne 3020M Operating Instructions Manual

Percent Paramagnetic Oxygen Analyzer

3.3.9 Remote Sensor and Solenoid Valves

The 3020M is a single-chassis instrument, which has its own sensor
and, in the –C option, its own gas-control solenoid valves. The REMOTE
SENSOR connector is not used, and the SOLENOID RETURN connectors
are used (without the –C option) to synchronize external gas control valves.
See Figure 3-7.
+15 VDC
16-2
+15 VDC
15-2
+15 VDC
14-2
+15 VDC
13-2
SAMPLE (return)
16-1
SPAN (return)
15-1
ZERO (return)
14-1
EXHAUST (return)
13-1
Figure 3-7: Remote Solenoid Return Connector Pinouts
The voltage from these 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 a relay, power amplifier, or other matching circuitry
to provide the actual driving current.
In addition, each individual line has a series FET with a nominal ON
resistance of 5 ohms (9 ohms worst case). This could limit the obtainable
voltage, depending on the load impedance applied. See Figure 3-8.
Matching
Circuitry
(If
Necessary)
Figure 3-8: FET Series Resistance
Teledyne Analytical Instruments
Installation 3
Remote Solenoid 1
Remote Solenoid 2
Remote Solenoid 3
Remote Solenoid 4
Remote Solenoid 1
Remote Solenoid 2
Remote Solenoid 3
Remote Solenoid 4
3-11