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AM16/32B Relay Multiplexer 28

Appendix C.

Thermocouple

measurement

If the AM16/32B will be used in thermocouple measurements, the practices outlined below should

be followed to make the best possible measurement. The data logger manuals contain thorough

discussions of thermocouple measurement and error analysis. These topics will not be covered

here.

NOTE:
The AM16/32B is not recommended for making highly accurate thermocouple measurements.

Instead, Campbell Scientific recommends the AM25T, which uses an onboard PRT as a

reference junction.

C.1

Measurement considerations

C.1.1 Reference junction

As shown in

FIGURE C-1

and

FIGURE C-2

, two reference junction configurations are possible:

1) reference located at the data logger or 2) reference at the AM16/32B.

C.1.2 Data logger reference

If the reference junction is at the data logger, matching thermocouple wire should be run

between the COM terminals of the multiplexer and the differential input channel on the data

logger (observe TC wire polarity).
The CR6, CR3000, CR1000X, CR800 series, CR300 series, and CR1000 have built-in temperature

references.

NOTE:
The measurement from the CR6 and CR300

PanelTemp()

instruction does not accurately

reflect the temperature of the wiring panel, since it measures the temperature of the main

processing board. Therefore, if the processor or charge (CHG) input are active, the PanelTemp

measurement will be warmer than ambient. This should be taken into consideration if this

measurement is used as a reference temperature for thermocouples.

Содержание AM16/32B

Страница 2: ...sure 15 8 Operation 15 8 1 Programming 16 8 1 1 Short Cut programs 16 8 1 2 Using CRBasic MuxSelect instruction 18 8 1 3 General programming considerations 18 8 1 4 Mixed sensor types 19 8 2 General m...

Страница 3: ...nection 24 FIGURE B 4 Full bridge measurement 26 FIGURE C 1 Differential thermocouple measurement with reference junction at the data logger 29 FIGURE C 2 Differential thermocouple measurement with re...

Страница 4: ...sors to be measured NOTE This manual provides information for CRBasic data loggers and AM16 32Bs with serial numbers greater than 5056 For Edlog and other retired data logger support or for specificat...

Страница 5: ...ging the setting of the mode switch from 4x16 to 2x32 connects COM ODD H to COM EVEN H and also COM ODD L to COM EVEN L After wiring the AM16 32B exercise due care to avoid inadvertently putting exces...

Страница 6: ...for programming the CR300 series to use the AM16 32B To use the AM16 32B with the CR300 series the program must be created in the CRBasic Editor See Single ended voltage measurement p 21 and Differen...

Страница 7: ...ejection for the United States and areas using 60 Hz AC voltage Select 50 Hz Noise Rejection for most of Europe and areas that operate at 50 Hz A second prompt lists sensor support options Campbell Sc...

Страница 8: ...ger The Progress Bar is used to track the progress of the program being created It is also used to jump directly to any step in the programming process The next window displays Available Sensors and D...

Страница 9: ...6 32 tab selected select the Sensors Temperature subfolder Double click on 107 Temperature Probe 4 wire In the resulting window enter the number of 107 temperature probes to measure on this AM16 32B m...

Страница 10: ...or longer is recommended Enter 30 and select Seconds Click Next After adding the measurements click Wiring Diagram to see how the sensors are wired to the AM16 32B and how the AM16 32B is wired to the...

Страница 11: ...s list to return to the sensor selection screen Select any other sensors being installed in the Sensors section Add sensors to the data logger by selecting the data logger tab CR6 in this example Add...

Страница 12: ...erview Under data logger control the AM16 32B sequentially connects terminal pairs or groups to data logger terminals This effectively expands the number of terminals available on a data logger FIGURE...

Страница 13: ...ctive 6 mA typical in 2x32 mode 11 mA typical in 4x16 mode Reset RES 1 A continuous signal between 3 3 VDC and 8 VDC holds the AM16 32B in an active state where a clock pulse can trigger a channel adv...

Страница 14: ...s per CR6 4 AM16 32Bs per CR3000 4 AM16 32Bs per CR1000X 2 AM16 32Bs per CR800 CR850 1 AM16 32B per CR300 4 AM16 32Bs per CR1000 Maximum cable length Depends on sensor and scan rate In general longer...

Страница 15: ...56 refer to an older version of this manual at www campbellsci com old manuals 3 Assumes sequential activation of multiplexers and that each data logger channel is uniquely dedicated If the applicatio...

Страница 16: ...ated under the blue COM label next to the mode switch The terminals are labeled ODD H L and EVEN H L In 4x16 mode the AM16 32B maintains the four COM terminals electrically isolated from one another I...

Страница 17: ...eld ground and the ground lug to provide surge suppression The AM16 32B GND terminal is connected to data logger power ground The AM16 32B GND terminal is also connected to the cable shield and via th...

Страница 18: ...tate In the low power state the common COM terminals are electrically disconnected from all the sensor input channels Always connect RES to a data logger terminal configured for control The MuxSelect...

Страница 19: ...channel numbers apply The SETs are labeled beginning with 1H 1L and ending with 32H 32L In 2x32 mode when the AM16 32B selects a given channel the H terminal is relay connected to both COM H terminal...

Страница 20: ...er is in 2x32 mode the first seven terminal pairs numbers in white on the multiplexer will be used When in 4x16 mode this instruction will use the first seven groups of four numbers in blue on the mul...

Страница 21: ...tiplexer and the PortSet instruction to disable it The generalized programming sequence follows Turn AM16 32B Multiplexer on C1 CLK C2 RES Advance to first measurement channel in SET 1 MuxSelect C1 C2...

Страница 22: ...nt instruction to allow time for wire capacitances to discharge after advancing a channel before the measurement is made This can be done by increasing the Delay parameter in the PulsePort instruction...

Страница 23: ...This program can now be edited for additional refinement NOTE Once the file is edited with CRBasic Editor Short Cut can no longer be used to edit the program it created 2 To add the Short Cut wiring...

Страница 24: ...ns also require a 150 ms Delay instruction immediately after the PortSet instruction Using MuxSelect with the AM16 32B does not require the delay allowing for faster operation In all cases PortSet is...

Страница 25: ...16 mode Sensors Control and COM terminals Measurement terminals Signal Ground Signal Ground COM ODD H Odd numbered H terminal Sensor 1 2 and 3 grounds 1H 1H COM ODD L Odd numbered L terminal Sensor 1...

Страница 26: ...0 CR800 series or CR1000 In either case the AM16 32B must be in 2x32 mode View the program in the CRBasic Editor FIGURE B 2 Typical differential voltage measurement connection These programs use array...

Страница 27: ...exer See AM16 32B Example B 5 CR6 107 temperature probe measurements CR6 and Table B 3 for the program and wiring diagram or use Short Cut to create the program With minor adjustments the CR6 program...

Страница 28: ...Full bridge measurement Up to sixteen full bridge measurements may be multiplexed through the AM16 32B A problem with making full bridge measurements with this configuration is that the resistance of...

Страница 29: ...EVEN L Even numbered L Low COM Shield 12V 12V G G C1 CLK C2 RES B 5 CS616 measurement Example AM16 32B Example B 7 CR1000X CS616 measurements CR1X is a CR1000X program measuring 48 Campbell Scientifi...

Страница 30: ...1 2 and 3 Orange 1H COM ODD L Odd numbered L Sensor 1 Green 1L COM EVEN H Even numbered H Sensor 2 Green 2H COM EVEN L Even numbered L Sensor 3 Green Signal Ground COM Black 12V 12V G G C1 CLK C3 RES...

Страница 31: ...configurations are possible 1 reference located at the data logger or 2 reference at the AM16 32B C 1 2 Data logger reference If the reference junction is at the data logger matching thermocouple wire...

Страница 32: ...AM16 32B if thermocouples are measured with respect to the data logger reference the signal wires between the data logger and AM16 32B are made of thermocouple wire Two problems would arise due to the...

Страница 33: ...in thermocouple readings For example with type T thermocouples a one degree gradient between the input terminals and the COM terminals will result in an approximate one degree measurement error Insta...

Страница 34: ...ther manufacturer s products that are resold by Campbell Scientific are warranted only to the limits extended by the original manufacturer Refer to www campbellsci com terms warranty for more informat...

Страница 35: ...ion or Repair Reference number contact your CAMPBELL SCIENTIFIC regional office Please write the issued number clearly on the outside of the shipping container and ship as directed For all returns the...

Страница 36: ...and prohibit climbing by other persons Take reasonable precautions to secure tripod and tower sites from trespassers Use only manufacturer recommended parts materials and tools Utility and Electrical...

Страница 37: ...nfo campbellsci fr www campbellsci fr Germany Location Phone Email Website Bremen Germany 49 0 421 460974 0 info campbellsci de www campbellsci de India Location Phone Email Website New Delhi DL India...

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