AMI Analyzer Manual •
••
• 9
Display unit connections:
The Display unit is designed to be connected to the probe, and to provide a calibrated output signal. It
needs between 12 and 24V DC power as above, and uses the 5V supply from the probe as the power for
its meter.
IMPORTANT: CONNECT THE POWER SUPPLY TO THE CHANNEL DISPLAY. THE PROBE WILL GET
POIWER THROUGH THE DISPLAY.
Back Panel
Connections
Model 60 Wires /
Connections
Probe 1 Brown
Probe 2 Black
Probe 3 Blue
Probe 4 White
PWR + +
12-24V DC
PWR - Ground
O/P + 4-20mA +
O/P- 4-20mA -
Initial test:
Install the unit as desired, and connect it to some form of monitoring system. Install the oxygen sensor,
making sure that it is the right way up. The sensing surface (and therefore the whole probe) should be
pointing downwards.
Expose the unit to air, and calibrate the monitoring system to 20.9% oxygen (or equivalent nitrogen for
nitrogen purity systems). The unit should be recalibrated after about one day, and thereafter at a rate
determined by usage, though once a month is typical.
Output connections:
The voltage output circuit is capable of driving an input resistance of 10K Ohms or more. Lower input
resistances will degrade the accuracy of the circuit.
Sample connection:
The sample may be introduced to either of the two barbed fittings on the cap of the unit. It may be
desirable to provide a tee in the line for calibration - see the discussion below. Sample flow rate should be
between 0.1 SCFH to 2.1 SCFH, the exact amount not being critical. Avoid back-pressuring the sensor with
excess flow if there is any restriction on the exhaust.
The first four connections are connections to the probe; the second four are user connections.
(Input Power
Supply)
(Ground Input
Power Supply)
(+) Power for
the Probe
Ground Power
for the Probe
(Auxillary: 5V)
(Voltage Output
from the Probe)
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