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AM16/32B Relay Analog Multiplexer

"4 X 16" Mode

COM H (ODD)

COM L

COM H (EVEN)

COM L

ODD H

ODD L

EVEN H

EVEN L

SENSOR SHIELDS

COM

"4 X 16" Mode

COM H (ODD)

COM L

ODD H

ODD L

CR23X/

CR800/

CR850/

CR1000

21X/

CR7

CR10(X)

CR3000/

CR5000

EX E E VX

H H H H

L L L L

H H H H

L L L L

FIGURE 17. Full Bridge Measurement with Excitation Compensation

6.6 Thermocouple Measurement

The datalogger manuals contain thorough discussions of

thermocouple measurement and error analysis. These topics will not

be covered here.

6.6.1 Measurement Considerations

Reference Junction - As shown in Figure 18 and 18, two reference

junction configurations are possible: 1) reference located at the

datalogger or 2) reference at the AM16/32B.

Datalogger Reference - The CR1000, CR800, CR850, CR3000,

CR23X, 21X and the CR7 723-T Analog Input card with RTD have

built-in temperature references. The CR10XTCR Thermocouple

Reference (not standard with CR10X purchase), is installed on the

wiring panel between the two analog input terminal strips.

When the reference junction is located at the datalogger, the signal

wires between the data-logger and the AM16/32B must be of the

same wire type as the thermocouple (Figure 18). The "polarity" of the

thermocouple wires must be maintained on each side of the

multiplexer (e.g. if constantan wire is input to an L terminal, then a

constantan wire should run between the multiplexer's COM ODD L

terminal and the datalogger measurement terminal). Figures 17 and

18 depict type T thermocouple applications, but other thermocouple

types (e.g. E, J, and K) may also be measured and linearized by the

dataloggers.

If thermocouples are measured with respect to the datalogger

reference (i.e. the signal wires between datalogger and AM16/32B are

made of thermocouple wire), then it is not recommended that one

make measurements of any other sensor type through the AM16/32B.

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