Daytronic AA14-4F010 Handleiding

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1GENERALDESCRIPTIONANDSPECIFICATIONS

The AA14-4F010 is a high-isolation, four-channel conditioner, accepting real-world

temperature signals from

Types E, J, K, N, R, S, and T Thermocouples. Based on

NISTpolynomials, linear output is produced over each thermocouple’s stated operat-

ing range, and within the rated accuracy limits—

without the need for additional output

processing.

See Table 1 for the “mV/degree” linear output produced by the AA14-

4F010 for different TCtypes and ranges (°C or °F).

PLEASENOTE: WHILE ALL FOUR CHANNELS OF A GIVEN AA14-4F010 CARD MUST

BE DEDICATED TO THE SAME TC TYPE

, INDIVIDUAL CARDS DEDICATED TO DIFFER-

ENT TC TYPES MAY BE MIXED AS DESIRED WITHIN THE TOTAL DATA ACQUISITION

SYSTEM. ITISALSOREQUIREDTHATTHE AA14-4F010’S

CHANNELNO. 1BEUSED.

This conditioner features

true galvanic isolation with pulse-width modulation,

allowing sensor-to-chassis or sensor-to-sensor common-mode voltages as high as

1500 V (rms) to be accommodated. Internal reference-junction compensation is auto-

matically selected by thermocouple choice. No external cold junction is required

(although the user may supply his own Controlled Ambient Temperature Zone for ref-

erence-junction purposes, if desired).A conventional Daytronic four-channel isother-

mal connector assembly (No. 60323, shown in Figs. 2 and 3) is supplied with each

Model AA14-4F010, with screw terminals for direct connection of TC leads (which can-

not be soldered), and with a

precision thermistor for measurement of the reference-

junction temperature. The same connector may be used with any TC type.

In the event of a broken thermocouple wire or other “open TC” condition, the AA14-

4F010 will automatically report an indeterminate off-scale reading for the TC channel

in question, with positive or negative polarity selectable on a per-channel basis (as

explained in Section 3.a).

Each AA14-4F010 input channel employs an active low-pass filter with a fixed cutoff

frequency of 10 Hz. A nominal ±5-V ANALOGOUTPUT is produced by each active

AA14-4F010 input channel, for purposes of real-time signal monitoring. Each of these

“Auxiliary Outputs” is available on a corresponding mainframe wire-wrap pin. Each

output may be individually set, if desired, to represent the

prefiltered value of the cor-

responding input (see Section 3.b).

“Absolute” calibration lets you quickly set up each TC-based data channel simply by

entering appropriate “type” and “range” information. During operation, appropriate

reference-junction compensation, real-time digital linearization, and engineering-unit

scaling are automatically applied for each type of thermocouple used. A second, two-

point “zero and span” calibration technique is provided, however, for applications

where it is desirable to force multiple TC readings to the same exactly known temper-

ature.*

MODELAA14-4F010

THERMOCOUPLE

CONDITIONERCARD

GENERALDESCRIPTIONANDSPECIFICATIONSAA14-4F010.1

SYSTEM10

ANALOGINPUTCARDS

*In heat balance applications, for example, it is useful to be able to zero all readings simultane-

ously.

1.E.2.AA14-4F010

Product specificaties