Related Manuals for Campbell AM32
Summary of Contents for Campbell AM32
- Page 1 AM32 Multiplexer Revision: 2/96 C o p y r i g h t ( c ) 1 9 8 3 - 1 9 9 6 C a m p b e l l S c i e n t i f i c ,...
- Page 2 CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface carrier prepaid. This warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to modification, misuse, neglect, accidents of nature, or shipping damage. This warranty is in lieu of all other warranties, expressed or implied, including warranties of merchantability or fitness for a particular purpose.
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Page 3: Table Of Contents
AM32 Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links to specific sections. 1. Function...............1 2. Specifications .............2 3. Operation..............2 3.1 The Control Terminals................2 3.1.1 Reset....................3... - Page 4 9.1 Environmental Constraints ..............22 10. Differences between the AM32 and the AM416 ..22 List of Figures 1-1. Plan View of the AM32 Relay Multiplexer with Cover Plate Removed ......................1 3-1. Hook-up Diagrams for Datalogger to AM32 Connections ..... 3 3-2.
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Page 5: Function
Two lines are switched simultaneously; a maximum of 32 sets of 2 lines (32 channels) may be scanned. FIGURE 1-1. Plan view of the AM32 Relay Multiplexer with cover plate removed. -
Page 6: Specifications
Without field encl. 21.6 x 16.5 x 2.5 cm The CR10(X), 21X and CR7 dataloggers are (8.5" x 6.5" x 1.0") connected to the AM32 as shown in Figure 3-1. Field enclosure 34.3 x 28.7 x 14.1 cm (13.5" x 11.3" x 5.5") The maximum terminal opening is 1.5 mm,... -
Page 7: Reset
AM32 MULTIPLEXER FIGURE 3-1. Hook-up diagrams for datalogger to AM32 connections. first clock pulse is received, the common lines 3.1.1 RESET are connected to multiplexer channel 1 (1H, Reset (RES) controls activation of the 1L). When a second clock pulse is received, multiplexer. -
Page 8: Ground
If a the AM32 (Figure 3-2). separate supply is used to power the AM32, the ground of that supply should be connected to the datalogger power supply ground or directly to earth ground (Figure 3-2). -
Page 9: The Measurement Terminals
AM32 MULTIPLEXER TABLE 3-1. CR10(X)/AM32 average current drain making differential measurements on 32 thermocouples. integration time SCAN RATE SLOW 60 Hz REJECTION FAST 2 MIN => 0.9mA 1.1mA 0.8mA 2 SEC => 22mA 39mA 17mA channel is connected sequentially with COM 3.2 THE MEASUREMENT TERMINALS... -
Page 10: Single Loop Instruction Sequence
10ms delay with a 5000mV excitation. measurement instructions are connected to the A control port can be used to clock the AM32 if same multiplexer. In this instance, sensors that no excitation channels are available. -
Page 11: Sensor Hook-Up And Measurement Examples
5.0 SENSOR HOOK-UP & MEASUREMENT EXAMPLES This section covers sensor-AM32 connections as well as AM32-datalogger measurement connections. The following are examples only and should not be construed as the only way to make a particular measurement. -
Page 12: Example Programs - Generalized Program Loops For The 21X, Cr10(X), And Cr7
AM32 MULTIPLEXER TABLE 5-1. EXAMPLE PROGRAMS - GENERALIZED PROGRAM LOOPS FOR THE 21X, CR10(X), AND CR7. 21X SAMPLE PROGRAM CR7 SAMPLE PROGRAM CR10(X) SAMPLE PROGRAM Table 1 Table 1 Table 1 Programs Programs Programs Sec. Sec. Sec. Execution Execution Execution... -
Page 13: Differential Measurements
When the reference junction is located at the datalogger, the signal wires between the datalogger and the AM32 must be of the same wire type as the thermocouple (Figure 6-1). The 21X and CR7 have reference temperature FIGURE 5-3. Half Bridge measurement with sensors installed under differential input resistor at the datalogger. -
Page 14: Thermal Gradients
AM32, it is generally best to locate the reference junction on the AM32, as shown in Figure 6-2. So that copper wire, instead of thermocouple wire, can be run between the AM32 and datalogger. If the other sensors have larger outputs (e.g. -
Page 15: Programming Examples
This program samples the 32 soil moisture potentials every 6 hours (360 minutes). The leads from the block electrodes are connected directly to the AM32; the lead from the center electrode attaches to high and the lead from the outer electrode to low. It is... - Page 16 Sec. Execution Interval If time is measure every minutes into a 6 hours minute interval Then Do activate the AM32 Set high Port 1 Beginning of Loop start the loop to Delay measure and clock Loop Count clock the AM32...
- Page 17 AM32 MULTIPLEXER Polynomial 0.1 to 2 Bar coversion X Loc SM Bars#1 F(X) Loc : [SM Bars#1] .06516 .95117 -.25159 -.03736 .03273 -.00394 Else Z=X*F divide by 10 to X Loc SM Bars#1 fit polynomial Z Loc : [SM Bars#1]...
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Page 18: Programming Example: Thermocouples With Reference At The Datalogger
The following example explains the wiring and programming necessary to make measurements of 10 copper-constantan thermocouples (type T) using the AM32 multiplexer. The AM32 should be enclosed in an AM-ENCT enclosure. In the example program, thermocouple temperature measurements are made on the first 10 AM32 channels. - Page 19 AM32 MULTIPLEXER EXAMPLE PROGRAM FOR 21X A PROGRAM TO MEASURE 10 TCs Table 1 Programs Sec. Execution Interval Panel Temperature measure reference Loc [:ref temp ] temp enable AM32 Set high Port 1 Beginning of Loop start loop to Delay...
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Page 20: Cr10(X) Programming Example: 223 Moisture Blocks And Type Tthermocouples With Reference At The Multiplexer
Instruction 11. A thermocouple reference temperature could also be made at the datalogger. Thermocouple wire would have to be run from the AM32 to the FIGURE 7-3. Wiring Diagram for example of datalogger. The use of constantan wire as the... - Page 21 Mult Offset If time is measure every 6 minutes into a hours minute interval Then Do enable the AM32 Set high Port 1 Beginning of Loop start loop to Delay measure and clock Loop Count clock the AM32 Pulse Port 6...
- Page 22 AM32 MULTIPLEXER If X<=>F if Rs < 5k ohms X Loc SM Bars#1 < Then Do Polynomial 0.1 to 2 Bars conversion X Loc SM Bars#1 F(X) Loc : [SM Bars#1] .06516 .95117 -.25159 -.03736 .03273 -.00394 Else Z=X*F divide by 10 to...
- Page 23 AM32 MULTIPLEXER Thermocouple Temp (DIFF) measure TCs 2.5 mV slow Range IN Chan Type T (Copper-Constantan) Ref Temp Loc 17-- Loc : [TCtemp#1] Mult Offset loop for TCs deactivate the Set low Port 1 AM32 Set high Flag 0 (output)
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Page 24: Programming Example: Half Bridge Measurement With Completion Resistor(S) At The Datalogger - 107 Temperature Probes
AM32 MULTIPLEXER Instruction 22 is used to clock the AM32 with an 7.4 21X PROGRAMMING EXAMPLE: HALF excitation channel. BRIDGE MEASUREMENT WITH COMPLETION RESISTOR(S) AT THE DATALOGGER - 107 TEMPERATURE PROBES The 107 temperature probe can be multiplexed with the AM32. The following diagram and program depicts the setup required to make temperature measurements. -
Page 25: General Measurement Considerations
AM32 power ground establishes a common 9.0 INSTALLATION ground. The Installation/Maintenance The standard AM32 may be operated in an Section of your datalogger manual has indoor, non-condensing environment. If more information on grounding procedures. condensing humidity is a problem or if the multiplexer might be exposed to liquids, a 3. -
Page 26: Environmental Constraints
(4 x 16). humidity environments, putty (or a similar substance) helps to reduce the passage of 2. The AM32 comes as a circuit board that moisture into the enclosure via the cable needs to be mounted in an enclosure. The conduits. - Page 27 This is a blank page.
- Page 28 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za sales@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)