Teledyne 3290 - OEM percent oxygen analyzer - Manual (Page 31)

Percent Oxygen Analyzer Installation
Teledyne Analytical Instruments 21
Table 3-1: Required RS-232 Data Format
Parameter Setting
Baud 2400
Byte 8 bits
Parity none
Stop Bits 1
Message Rate 2 per second
External Probe: The receptacle for the analysis unit cable is
located in the lower left-hand corner of the rear panel. The 6-pin Minifit
connector is keyed to fit only one way into the receptacle. Do not force
it in. The other end of the cable is made of four separate wires. These
should be connected to the terminal strip on the analysis unit as follows:
Red: #1
Black: #2
Green: #3 The green and white connectors can be
White: #4 interchanged, but be consistent.
Refer to the Final Assembly, Dwg. C-64643.
3.4 Gas Connections
Gas connection instructions depend on the specific External Probe
used and any special requirements of the process being monitored.
The standard Model 3290 External Probe has inlet and outlet
fixtures only. Calibration gases must be tee’d into the sample inlet
through appropriate valves. ¼ inch tube fittings are used. For metric
installations, ¼ inch to 6 mm adapters are supplied.
In general, sample flow and pressure must not create significant
backpressure past the sensor. For the standard probe, set the pressure to
achieve a 2 SCFH flowrate.
The pressure required will depend on the sampling system. When
venting into a constant pressure, such as the atmosphere, controlling
input pressure is simple. If you are venting into a system of varying
pressure, then some form of pressure regulation is required. Refer to
Section 2.2.4 The Effect of Pressure for more information.
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