Related Manuals for Campbell AM416
Summary of Contents for Campbell AM416
- Page 1 AM416 Relay Multiplexer Revision: 2/96 C o p y r i g h t ( c ) 1 9 8 7 - 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
INSTALLATION 8.1 Environmental Constraints ........................18 APPENDIX A. AM416 STUFFING CHART AND SCHEMATICS ........A-1 APPENDIX B. DIFFERENCES BETWEEN THE AM416 AND AM32 ......B-2 LIST OF FIGURES Plan View of the AM416 Relay Multiplexer ................2 Hook-up Diagrams for Datalogger - AM416 Connections............4 Power and Ground Connections for External Power Supply............5... - Page 4 Four Wire Half Bridge Hook-up and Measurement..............13 Differential Measurement with Sensor Excitation..............13 Full Bridge Measurement with Excitation Compensation............14 Differential Thermocouple Measurement with Reference Junction at the Datalogger.....15 Differential Thermocouple Measurement with Reference Junction at the AM416 ....15 Thermocouple and Soil Block Measurement ................16...
- Page 5 CAUTIONARY NOTES The AM416 is not designed to multiplex power. Its intended function is to switch low level analog signals. Switched current in excess of 30 mA will degrade contacts and render them unsuitable for future low level analog measurements. Customers who need to switch power are directed to CSI's A6REL-12 or A21REL-12 relays.
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Page 7: Typical Applications
2. PHYSICAL DESCRIPTION excitation; Section 6.3.3 and 6.4). The AM416 is housed in a 21 cm x 16.5 cm x 4. In conjunction with an AM32 multiplexer, up 3.5 cm (8.2" x 6.5" x 1.5") anodized aluminum to 16 six-wire full bridges (Section 6.5). -
Page 8: Plan View Of The Am416 Relay Multiplexer
AM416 through a minimum of control of the AM416 (Section 4.1). The seven, but generally nine, individually insulated terminal strips that run the length of the AM416 lead wires. are for measurement connections (Section 4.2). AM416... -
Page 9: Am416 Specifications
RESET * : a continuous signal of 3.5VDC < the contact surfaces of the mechanical relays voltage < 16 VDC holds AM416 in an active (i.e. increase their resistance). This process will state (i.e. a clock pulse can trigger a scan adversely affect the suitability of these relays to advance). -
Page 10: Hook-Up Diagrams For Datalogger - Am416 Connections
AM416 RELAY MULTIPLEXER FIGURE 2. Hook-up Diagrams for Datalogger - AM416 Connections CR10(X) Hook-up 21X Hook-up CR7 Hook-up The 21X or CR7 (with a 725 Card) can be used activate the multiplexer or low to enter to connect 12VDC supply and ground to the quiescent mode). -
Page 11: Power And Ground Connections For External Power Supply
(Instruction 22 - 5,000 mV AM416 is about 0.3 mA. Under the same excitation). If no switched excitation channels conditions, a 2 second scan rate increases the are available it is possible to clock using control average system current drain to about 8.5 mA. -
Page 12: The Measurement Terminals
AM416 RELAY MULTIPLEXER Within each SET, the four terminals are labeled H1, L1, H2, L2. As the AM416 receives clock pulses from the datalogger, each SET is switched sequentially into contact with the COM terminals. For example, when the first clock... - Page 13 5000mV excitation. A control port can be locations (--), one begins with input location 1, used to clock the AM416 if no excitation ports the other with input location 4; no P90. A total are available. The 21X and CR7 instruction of six sensors to be measured;...
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Page 14: Example Program Loops For Cr10(X), 21X, And Cr7 Dataloggers
AM416 RELAY MULTIPLEXER EXAMPLE PROGRAMS - GENERALIZED PROGRAM LOOPS FOR THE CR10(X), 21X 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 Interval... -
Page 15: Multiple Loop Instruction Sequence
Excitation 5.2 MULTIPLE LOOP INSTRUCTION SEQUENCE As shown above, the program for operation of FULL BRIDGE MEASUREMENT INSTRUCTION the AM416 is essentially the same for all CSI Full Bridge dataloggers. To measure sensors of different types, different measurement instructions may 50 mV slow Range be used within successive program loops. -
Page 16: General Programming Considerations
Sensor to Multiplexer wiring - up to two single- DISABLES MULTIPLEXER ended sensors that don't require excitation may Set Port be connected to one AM416 input SET. Set low Port Number Multiplexer to Datalogger wiring - Signal lines from COM terminals are input into two... -
Page 17: Differential Analog Measurement Without Sensor Excitation
AM416 RELAY MULTIPLEXER FIGURE 8. Single-ended Measurement Without Excitation FIGURE 9. Differential Measurement Without Excitation 6.2 DIFFERENTIAL ANALOG MEASUREMENT potentiometers), then excitation, wiper signal, and ground must be multiplexed. Because WITHOUT SENSOR EXCITATION excitation and ground may be multiplexed in... -
Page 18: Half Bridge (Modified 107 Temperature Probe) Hook-Up And Measurement
AM416 RELAY MULTIPLEXER FIGURE 10. Half Bridge (Modified 107 Temperature Probe) Hook-up and Measurement. FIGURE 11. Potentiometer Hook-up and Measurement 6.3.2 POTENTIOMETER MEASUREMENT 6.3.3 FOUR WIRE HALF BRIDGE WITH MEASURED EXCITATION Sensor to Multiplexer wiring - up to two potentiometers may be connected to one input Sensor to Multiplexer Wiring - one sensor per SET. -
Page 19: Full Bridge Measurements
Sensor to Multiplexer wiring - In a six wire reset and clocked by the same control ports measurement, two wires must bypass the and/or excitation channels, which simplifies AM416. One solution is to multiplex the four programming. signal wires through the AM416, but bypass the... -
Page 20: Thermocouple Measurement
When the reference junction is located at the datalogger, the signal wires between the data- 2. Some thermocouple wires have a greater logger and the AM416 must be of the same wire resistance than copper, which adds type as the thermocouple (Figure 15). The resistance to the non-thermocouple sensor "polarity"... -
Page 21: Differential Thermocouple Measurement With Reference Junction At The Datalogger
AM416 RELAY MULTIPLEXER FIGURE 15. Differential Thermocouple Measurement with Reference Junction at the Datalogger. FIGURE 16. Differential Thermocouple Measurement with Reference Junction at the AM416. If a mix of TC's and other sensor types are terminals can cause errors in thermocouple multiplexed through the AM416, it is generally readings. -
Page 22: Mixed Sensor Types
(107 thermistor, RTD, etc.) is datalogger earth ground through the at the AM416, then two pair of copper wires multiplexer shield terminals. may be run between the COM terminals of the multiplexer and two differential input channels. - Page 23 AM416 RELAY MULTIPLEXER MEASURES 1 SOIL MOISTURE BLOCK PER EXAMPLE PROGRAM - THERMOCOUPLE LOOP AND SOIL BLOCK MEASUREMENT AC Half Bridge (PROGRAM IS FOR CR10(X) - 33 250 mV fast Range LOCATIONS ALLOCATED TO INPUT IN Chan STORAGE) Excite all reps w/EXchan 2...
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Page 24: General Measurement Considerations
AM416 RELAY MULTIPLEXER 7. GENERAL MEASUREMENT 8. INSTALLATION CONSIDERATIONS The standard AM416 may be operated in an indoor, non-condensing environment. If 1. Long lead lengths - long lead lengths condensing humidity is a problem or if the contribute to the formation of induced and... -
Page 25: Appendix A. Am416 Stuffing Chart And Schematics
APPENDIX A. AM416 STUFFING CHART AND SCHEMATICS... - Page 26 APPENDIX A. AM416 STUFFING CHART AND SCHEMATICS...
- Page 27 APPENDIX A. AM416 STUFFING CHART AND SCHEMATICS...
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- Page 29 APPENDIX B. DIFFERENCES BETWEEN THE AM416 AND THE AM32 The AM416 differs from Campbell Scientific's 4. The AM416 contains terminals and circuitry AM32 multiplexer in the following ways: for sensor shield wires. This circuitry allows sensor shield wires to be routed through the multiplexer and grounded at the datalogger.
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- Page 32 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)