Ultra Trace Oxygen Analyzer Installation 3
3-5
Teledyne Analytical Instruments

3.3.2.2 50-Pin Equipment Interface Connector

Figure 3-4 shows the pin layout of the Equipment Interface connector.
The arrangement is shown as seen when the viewer faces the rear panel of
the analyzer. The pin numbers for each input/output function are given
where each function is described in the paragraphs below.
Figure 3-4: Equipment Interface Connector Pin Arrangement
Analog Outputs: There are four DC output signal pins—two pins per
output. For polarity, see Table 3-1. The outputs are:
0–1 V dc % of Range: Voltage rises linearly with increasing oxygen, from
0 V at 0 ppm to 1 V at full scale ppm. (Full scale =
100% of programmable range.)
0–1 V dc Range ID: 0.25 V = Low Range, 0.5 V = Medium Range,
0.75 V = High Range, 1 V = Air Cal Range.
4–20 mA dc % Range: Current increases linearly with increasing oxygen,
from 4 mA at 0 ppm to 20 mA at full scale ppm.
(Full scale = 100% of programmable range.)
4–20 mA dc Range ID: 8 mA = Low Range, 12 mA = Medium Range, 16
mA = High Range, 20 mA = Air Cal Range.
Table 3-1: Analog Output Connections
Pin Function
3 + Range ID, 4-20mA, floating
4– Range ID, 4-20 mA, floating
5 + % Range, 4-20mA, floating
6– % Range, 4-20 mA, floating
8 + Range ID, 0-1V dc
23 – Range ID, 0-1 Vdc, negative ground
24 + % Range, 0-1V dc
7– % Range, 0-1 Vdc, negative ground
Alarm Relays: The nine alarm-circuit connector pins connect to the
internal alarm relay contacts. Each set of three pins provides one set of Form
C relay contacts. Each relay has both normally open and normally closed