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Oxygen Analyzer Installation
Teledyne Analytical Instruments 35
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
= 100ppm.
Table 3-1: Analog Output Connections
Pin Function
3+ Range ID, 4-20 mA, floating
4– Range ID, 4-20 mA, floating
5+ % Range, 4-20 mA, floating
6– % Range, 4-20 mA, floating
8+ Range ID, 0-1 V dc
23 – Range ID, 0-1 V dc, negative ground
24 + % Range, 0-1 V dc
7– % Range, 0-1 V dc, 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 nonfailsafe.
• Can be configured as latching or nonlatching.
• Can be configured out (defeated).