Teledyne 326, 327 and 328 - Oxygen analyzers User Manual

Page 23

Teledyne Analytical Instruments

Installation

Model 326/327/328

3-3

ground wire should be securely attached to a cold water pipe so that per-
sonnel are afforded maximum short circuit protection.

As with all other barrier strip connections, the wiring should be termi-

nated in an appropriate lug. Because of the #6 terminal screw and the
spacing between barrier dividers, TAI recommends that the gauge of the
wire employed not exceed that specified on the interconnection diagram.

3.2.2 Output Signal

Voltage Output

All models of the 326 series are equipped to provide a 0-1 V dc output

signal voltage. Other ranges can be negotiated. Refer to the Specific Appli-
cation Data and/or Special Addendum to determine the output signal magni-
tude for specials.

The output signal, regardless of magnitude, is suitable for high imped-

ance devices only (i.e., 10,000 ohms minimum). Optional outputs are
required for low impedance devices.

Two conductor, 22 gauge (AWG), shielded cable is recommended for

interconnecting the signal and the accessory readout device. Polarize the
signal connections as shown on the interconnection diagram (to avoid loss
of signal or possible damage to this instrument or other devices), and
connect the shield to the analyzer only

connect the shield to the analyzer only

connect the shield to the analyzer only. Do not connect the shield to the
accessory instrument, as this will create a ground loop, slowing down the
response from the high impedance device.

In the 327RAC/RBC and 328RC, the conduit port most conveniently

located with respect to the appropriate barrier strip terminals is indicated on
the control unit outline diagram. The conduit access hole is sized for ½" and
¾" conduit.

Current Output

Analyzers with the designation I or O appended to the model number

are equipped with an E to I converter to provide a DC current output
signal, as well as a DC voltage output signal. An O indicates an isolated
output, and one or two digits following the O specify the fullscale output in
milliamps. An I, followed by one or two digits, indicates a negative-ground
output and its fullscale value.

If your instrument is equipped with an isolated current output, be sure

to maintain the isolation of both positive and negative conductors from
ground.