Functional Overview

General Description

The AGM300 is designed to support compliance to federal, state and local safety codes governing ammonia gas emissions. Avoiding significant ammonia gas loss reduces equipment replacement costs, maintains equipment efficiency, promotes safety, and protects the environment.

The AGM300 provides for the continuous monitoring of ammonia gas levels in up to 16 separate test zones. Each zone can be independently programmed to identify leak (small), spill (medium), or evacuation (large) levels of gas. The instrument also retains a log of previous readings that can be easily accessed for analysis.

An audible alarm and large LED indicators are provided to signal alarm conditions, and relay contacts are provided for the connection of external alarm devices. The system also includes two 4–20 mA current loop interfaces (optional) for connection to external devices.

The AGM300 requires only minor periodic maintenance such as the occasional replacement of filters. The instrument incorporates active diagnostics that continuously monitor the system for proper operation. An LED indicator is provided to indicate system malfunctions, and fault codes are displayed that enable the operator to identify the source of the fault.

Communication Options

The AGM300 features full two-way communications via an RS-485 interface. MODBUS RTU is the communication protocol standard. The instrument can be connected directly to a Building Management System or it may be operated as a stand-alone system using the ADM800 Ammonia Display Module.

An RS-232C port is also provided for connection to a PC. This enables the AGM300 to be setup from a personal computer.

Please refer to the Appendix for a more complete discussion of communication protocols.

Suggested Location of Sampling Points

At the point of an ammonia gas leak the gas is nearly pure. As the gas is dispersed into the air, the gas molecules diffuse causing a dilution of the original concentration. The AGM300 measures the ammonia gas concentration at the precise point the sample is collected. Therefore, if the termination of the collection line is not at the exact point of the gas leak, then the unit will read a diluted mixture of the gas and air.

It should also be noted that when ammonia gas is cold it is heaver than air and settles below the leak point, but as the gas warms to room temperature it becomes lighter than air and tends to collect above the point of a leak. Consequently, sampling points should ideally be located as close as possible to the source of potential leaks. If this is impractical, then the alarm set points should be adjusted for that zone to compensate for the dilution of the gas. DO NOT plug any of the zones. Plugging a zone will give the monitor a false indication during

start up.

The AGM300 should be centrally located in the mechanical room and be readily accessible for easy visual monitoring and servicing. Air sample tubing may be run in lengths up to 500 feet. The fresh air purge line should draw from an area that does not contain any ammonia gas and cannot exceed 300 feet in length. The exhaust line should run to an out side location if possible. The length of the exhaust line cannot exceed 300 feet.

Ideally, two to three pick up points spaced around each chiller will provide sufficient coverage. It may be necessary to perform a “smoke” test of the mechanical room to determine the best locations. The smoke test would provide the pattern of air currents present in the mechanical room.

Instruction 3015-4275

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Bacharach AGM300 Functional Overview, General Description, Communication Options, Suggested Location of Sampling Points
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AGM300, ADM800 specifications

The Bacharach ADM 800 and AGM 300 are advanced analyzers designed for efficient monitoring and detection of gases in various applications. Known for their reliability and accuracy, these instruments cater to commercial and industrial sectors, ensuring safety and compliance with environmental regulations.

The Bacharach ADM 800 is a portable gas detection device renowned for its ability to detect multiple refrigerants. With a user-friendly interface, it features a high-resolution display that provides real-time data on refrigerant concentrations, allowing technicians to quickly identify leaks during maintenance operations. One of its standout technologies is a highly sensitive thermal conductivity sensor, which enables the ADM 800 to differentiate between various hydrocarbon refrigerants with precision.

Equipped with data logging capabilities, the ADM 800 can store and retrieve measurement data, making it an invaluable tool for tracking refrigerant trends over time. The device supports USB connectivity for easy transfer of data to computers, facilitating detailed reporting and analysis. Its robust design incorporates a protective casing that ensures durability in challenging work environments, making it ideal for both field use and stationary applications.

On the other hand, the Bacharach AGM 300 is specifically crafted for continuous gas monitoring in HVAC systems. This stationary device excels in measuring concentrations of gases such as CO, CO2, and various refrigerants, ensuring optimal performance and compliance. The AGM 300 uses advanced electrochemical sensors for precise gas measurements, providing real-time feedback and alerting users to any hazardous conditions.

One of the notable features of the AGM 300 is its ability to integrate seamlessly with building management systems, enabling centralized control and monitoring of gas levels across multiple locations. This connectivity enhances the safety of industrial and commercial spaces by allowing for automated responses to detected gas levels, which can significantly mitigate risks associated with gas leaks.

Both models emphasize user-centric design, with intuitive interfaces and clear displays, making them accessible even to those with minimal training. Additionally, their low maintenance requirements and long sensor life contribute to reduced operational costs.

In conclusion, the Bacharach ADM 800 and AGM 300 are exemplary solutions for gas detection and monitoring. Their advanced technologies, robust features, and user-friendly designs make them indispensable for ensuring safety and regulatory compliance in various environments.
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