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Trace Oxygen Analyzer Installation
Teledyne Analytical Instruments 19
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: 7.2 mA = Low Range
12 mA = Medium Range
16.8 mA = High Range
Table 3-1: Analog Output Connections
Pin Function
3 + Range ID, 4-20 mA, floating
4 – Range ID, 4-20 mA, floating
5 + ppm Range, 4-20 mA, floating
6 – ppm Range, 4-20 mA, floating
8 + Range ID, 0-1 VDC
23 – Range ID, 0-1 V dc, negative ground
24 + ppm Range, 0-1 VDC
7 – ppm 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 contact connections. The contact connections are shown in Table
3-2. They are capable of switching up to 3 amperes at 250 VAC into a
resistive load. The connectors are:
Threshold Alarm 1:
Can be configured as high (actuates when concentration
is above threshold), or low (actuates when concentration
is below threshold).
Can be configured as failsafe or non-failsafe.
Can be configured as latching or non-latching.
Can be configured out (defeated).