Teledyne 9700 instruction manual Alarm and/or Control Circuitry, Output Signal Current

Flue Gas Analysis System Installation 3

3.1.3 Alarm and/or Control Circuitry

Models having a -1 or -2 as part of their model number are equipped with single (-1) or double (-2) alarm and/or control circuits.

The SPDT form "C" (NC/C/NO) contacts of the relay (or relays) are available on the terminal strip within the oxygen analyzer. To properly use the switch that the relay contacts represent, the customer must determine when the relay (or relays) is energized (above or below the setpoint). The appropriate terminal strip connections are identified on the interconnection diagram (see Figure 6).

For those not familiar with relay terminology, the terms normally open (NO) and normally closed (NC) refer to the relay contact configura- tion when the relay is in a de-energized condition.

The load current per relay must be limited to 3 Amperes non-induc-

tive.

3.1.4 Output Signal Current

Instruments which include the designation "I" as part of their model number are equipped with an E-to-I converter to provide a DC milliampere (mA) output signal as well as a DC voltage signal.

Aseparate 1/4 ampere slow-blow fuse, located on the analyzer control panel, protects this circuitry.

The range for current output is:

•4–20 mA dc

Suitable for devices with 0–1500 Ohms impedance (resistive).

The appropriate terminal strip connections are identified on the interconnection diagram (see Figure 6).

TELEDYNE BROWN ENGINEERING 3-3

Analytical Instruments