Contents

Revision and Copyright Information
Limited Warranty
Assistance
Safety
Table of Contents
1. Introduction
2. Precautions
3. Initial Inspection
4. Overview
- 4.1 Measurement Terminals
- 4.2 Excitation Terminal (VX)
- 4.3 Power (12V)
- 4.4 Power Ground (G), Ground Terminals ()
- 4.5 Analog Ground ()
- 4.6 Reset (RES)
- 4.7 Clock (CLK)
5. Terminal Strips
6. Specifications
7. Installation
- 7.1 Installing the AM25T
- 7.2 Data Logger to AM25T Wiring
- 7.3 Sensor to AM25T Wiring
  - 7.3.1 Thermocouple Measurement
  - 7.3.2 Differential Analog Measurements
  - 7.3.3 Mixed Sensor Types
8. Operation
- 8.1 General Measurement Considerations
- 8.2 Data Logger Programming
  - 8.2.1 CRBasic Programming
9. Maintenance
Appendix A. Importing Short Cut Code Into CRBasic Editor
Appendix B. Example Program
Campbell Scientific Companies

Campbell Scientific AM1625T Product Manual

Campbell Scientific AM1625T Multiplexer manual cover

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Campbell Scientific AM1625T Multiplexer Specification

The Campbell Scientific AM1625T Multiplexer is a sophisticated device designed to expand the channel capacity of compatible data loggers, providing the ability to monitor multiple sensors efficiently. It is engineered to handle 16 differential or 32 single-ended inputs, optimizing the data collection from numerous sensors simultaneously. The multiplexer operates seamlessly with various Campbell Scientific data loggers, enhancing their versatility and deployment in diverse environmental monitoring applications.

The AM1625T features an operational temperature range of -55°C to +85°C, making it suitable for extreme environments. It supports a wide range of sensor types, including thermocouples, RTDs, and other resistance-based sensors, ensuring broad applicability across different fields such as meteorology, hydrology, and agriculture. The device is equipped with low thermal EMF terminal blocks to minimize measurement errors associated with temperature gradients, thus ensuring high accuracy and reliability in data collection.

Communication with the data logger is facilitated through a control port, allowing automated switching between input channels under the control of the data logger's program. This automation significantly enhances data acquisition efficiency and reduces manual intervention. The AM1625T's robust design includes surge protection, which safeguards the connected sensors and the multiplexer itself from electrical transients and spikes.

Power consumption is optimized to be minimal, making the AM1625T suitable for remote or solar-powered applications where energy efficiency is crucial. The multiplexer is housed in a durable, weather-resistant enclosure, ensuring long-term performance even in harsh environmental conditions. Overall, the Campbell Scientific AM1625T Multiplexer is a reliable and efficient solution for expanding data collection capabilities in various scientific and industrial applications.

Campbell Scientific AM1625T Multiplexer F.A.Q.

What is the primary function of the Campbell Scientific AM1625T Multiplexer?

The AM1625T Multiplexer is designed to increase the number of sensors that can be connected to a datalogger by allowing multiple sensors to share the same input channel. This is particularly useful for large monitoring applications.

How do I connect sensors to the AM1625T Multiplexer?

To connect sensors, first ensure the multiplexer is powered off. Connect each sensor to the appropriate channel on the multiplexer, following the wiring diagram provided in the user manual. Secure all connections to prevent loose wiring.

What are the power requirements for the AM1625T Multiplexer?

The AM1625T requires a 12 VDC power supply. It is important to ensure the power supply is stable and meets the voltage requirements to prevent damage to the device.

How can I troubleshoot connectivity issues with the AM1625T Multiplexer?

Check all wiring connections for security and correctness. Verify that the multiplexer is properly powered. Use diagnostic tools to ensure signals are being correctly routed through the multiplexer. Consult the user manual for additional troubleshooting steps.

How often should I perform maintenance on the AM1625T Multiplexer?

Regular maintenance should be performed every 6 to 12 months. This includes checking all connections, cleaning the unit, and ensuring all components are functioning correctly.

What environmental conditions can the AM1625T Multiplexer withstand?

The AM1625T is designed to operate in a wide range of environmental conditions, typically -25°C to +50°C. It is important to protect the unit from extreme conditions such as direct sunlight and excessive moisture.

Can the AM1625T Multiplexer be used with any datalogger?

The AM1625T is compatible with most Campbell Scientific dataloggers. However, it is recommended to verify compatibility with your specific datalogger model before use.

What is the maximum number of sensors that can be connected to the AM1625T Multiplexer?

The AM1625T can connect up to 25 sensors, allowing for extensive data collection in large monitoring systems.

How do I configure the AM1625T for different types of sensors?

Configuration involves setting the appropriate channel settings for each sensor type. Refer to the user manual for specific instructions based on sensor type and application.

What should I do if the AM1625T Multiplexer is not responding to commands?

First, verify that the power supply is connected and functioning. Check all cable connections and ensure they are secure. If the issue persists, consult the troubleshooting section of the user manual or contact technical support.