Contents

Revision and Copyright Information
Warranty and Assistance
Table of Contents
AM32 MULTIPLEXER MANUAL
- 1.0 FUNCTION
- 2.0 SPECIFICATIONS
- 3.0 OPERATION
  - 3.1 THE CONTROL TERMINALS
    - 3.1.1 RESET
    - 3.1.2 CLOCK
    - 3.1.3 GROUND
    - 3.1.4 POWER SUPPLY
  - 3.2 THE MEASUREMENT TERMINALS
- 4.0 DATALOGGER PROGRAMMING
  - 4.1 SINGLE LOOP INSTRUCTION SEQUENCE
  - 4.2 MULTIPLE LOOP INSTRUCTION SEQUENCE
- 5.0 SENSOR HOOK-UP & MEASUREMENT EXAMPLES
  - 5.1 SINGLE-ENDED ANALOG MEASUREMENTS
  - 5.2 DIFFERENTIAL MEASUREMENTS
  - 5.3 HALF BRIDGE MEASUREMENTS
    - 5.3.1 HALF BRIDGE MEASUREMENT WITH COMPLETION RESISTOR AT DATALOGGER
  - 5.4 MIXED SENSOR TYPES
- 6.0 THERMOCOUPLE WIRING AND MEASUREMENT CONSIDERATIONS
  - 6.1 REFERENCE JUNCTIONS
  - 6.2 THERMAL GRADIENTS
- 7.0 PROGRAMMING EXAMPLES
  - 7.1 CR10(X) PROGRAMMING EXAMPLE: 32 SOIL MOISTURE BLOCKS, MODEL 223
  - 7.2 21X PROGRAMMING EXAMPLE: THERMOCOUPLES WITH REFERENCE AT THE DATALOGGER
  - 7.3 CR10(X) PROGRAMMING EXAMPLE: 223 MOISTURE BLOCKS AND TYPE T THERMOCOUPLES WITH REFERENCE AT THE MULTIPLEXER
  - 7.4 21X PROGRAMMING EXAMPLE: HALF BRIDGE MEASUREMENT WITH COMPLETION RESISTOR(S) AT THE DATALOGGER - 107 TEMPERATURE PROBES
- 8.0 GENERAL MEASUREMENT CONSIDERATIONS
- 9.0 INSTALLATION
  - 9.1 ENVIRONMENTAL CONSTRAINTS
- 10.0 DIFFERENCES BETWEEN THE AM32 AND THE AM416
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Campbell Scientific AM32 Instruction Manual

Campbell Scientific AM32 Multiplexer manual cover

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Campbell Scientific AM32 Multiplexer Specification

The Campbell Scientific AM32 Multiplexer is a sophisticated device designed to expand the measurement capabilities of data acquisition systems. It features 32 channels, allowing users to connect multiple sensors to a single data logger, thereby optimizing data collection processes in various environmental monitoring applications. The multiplexer operates by sequentially scanning each channel and directing the selected sensor's signal to the data logger's input, thus enabling the simultaneous monitoring of multiple parameters without the need for numerous data loggers.

The AM32 is compatible with a wide range of sensors, including thermocouples, thermistors, and other analog output sensors, making it versatile for different monitoring scenarios. It supports both single-ended and differential measurements, enhancing its application flexibility. The device is equipped with an internal switching mechanism that facilitates the rapid transition between channels, ensuring efficient data acquisition.

The multiplexer is designed for durability and reliability, with a rugged enclosure that protects against environmental hazards, making it suitable for field deployment. It operates within a temperature range of -25°C to +50°C, ensuring functionality in diverse climatic conditions. The AM32 requires a power supply of 12 volts DC, and it interfaces seamlessly with Campbell Scientific data loggers through a simple connection, which allows for easy integration into existing measurement systems.

Overall, the Campbell Scientific AM32 Multiplexer is a crucial component for expanding the monitoring capabilities of environmental data collection systems, providing both robustness and flexibility to meet the demands of complex data acquisition tasks.

Campbell Scientific AM32 Multiplexer F.A.Q.

How do I connect the AM32 Multiplexer to a data logger?

To connect the AM32 Multiplexer to a data logger, use the provided interface cables. Connect the control and power terminals on the multiplexer to the corresponding terminals on the data logger, ensuring all connections are secure to avoid signal loss.

What is the maximum number of sensors that can be connected to the AM32 Multiplexer?

The AM32 Multiplexer can accommodate up to 32 sensors. It allows for expansion of the data logger's input capability by sequentially switching between sensors.

What should I do if the multiplexer is not switching channels correctly?

If the multiplexer is not switching channels correctly, first check the control signals from the data logger. Ensure they are properly configured and correctly wired. Also, inspect the power supply to the multiplexer and ensure all connections are clean and secure.

How can I test if the AM32 Multiplexer is functioning properly?

To test the AM32 Multiplexer, manually switch through each channel using a diagnostic tool or a multimeter to ensure each channel is operating correctly. Additionally, verify the configuration settings in the associated data logger program.

What maintenance is required for the AM32 Multiplexer?

Regular maintenance for the AM32 Multiplexer includes checking all connections for corrosion or wear, ensuring the device is free from dust and debris, and verifying that all channels are switching correctly. Periodically verify firmware updates for the data logger that may affect multiplexer operation.

How can I protect the AM32 Multiplexer from electrical surges?

To protect the AM32 Multiplexer from electrical surges, use surge protectors or arrestors on power and signal lines. Additionally, ensure proper grounding of the equipment and consider installing the multiplexer in an environment with controlled electrical conditions.

What are the common troubleshooting steps if the AM32 Multiplexer stops working?

Common troubleshooting steps include checking power supply connections, verifying control signal integrity, inspecting and cleaning terminals, and reviewing configuration settings in the data logger software. If issues persist, consult the user manual or contact technical support.

Is it possible to use the AM32 Multiplexer in outdoor environments?

The AM32 Multiplexer can be used in outdoor environments, provided it is housed in a weatherproof enclosure to protect against moisture and temperature extremes. Ensure proper ventilation and consider humidity control measures if necessary.

How do I calibrate sensors connected to the AM32 Multiplexer?

To calibrate sensors connected to the AM32, follow the sensor manufacturer's calibration procedure. Use the data logger to record sensor outputs and adjust calibration settings as needed. Ensure that the multiplexer channel connections are stable during calibration.

Can the AM32 Multiplexer be used with different types of sensors?

Yes, the AM32 Multiplexer can be used with various types of sensors, including thermocouples, RTDs, and resistive bridges. Ensure that the data logger and multiplexer configuration are compatible with the specific sensor types being used.