3500 System Introduction

The 3500 System provides continuous, online monitoring suitable for machinery protection applications, and is designed to meet the requirements of the American Petroleum Institute’s API 670 standard for such systems. The system’s modular rack-based design includes the following components:

 1.3500/05 Instrument Rack (required)

2.One or two 3500/15 Power Supplies (required)

3.3500/22M Transient Data Interface (TDI) Module (required)

4.One or more 3500/XX Monitor Modules (required)

5.One or more 3500/32M (4-channel) or 3500/33 (16-channel)

Relay Modules (optional)：

1.One or two 3500/25 Keyphasor* Modules (optional)

2. One or more 3500/92 Communication Gateway Modules(optional)

3. Input/Output (I/O) Modules (required)

4. 3500/94M VGA Display (optional)

5. Internal or external intrinsic safety barriers, or galvanic isolatorsfor hazardous area installations (optional)

6. 3500 System Configuration Software (required)

System components are described in more detail in the followingsection and in their individual datasheets.

The 3500/60 & 61 modules 

The 3500/60 & 61 modules provide six channels of temperature monitoring and accept both Resistance Temperature Detector (RTD) and Thermocouple (TC) temperature inputs.  The modules condition these inputs and compare them against user-programmable alarm setpoints.  The 3500/60 and 3500/61 provide identical functionality except that the 3500/61 provides recorder outputs for each of its six channels while the 3500/60 does not. The user programs the modules to perform either RTD or TC temperature measurements using the 3500 Rack Configuration Software.  Different I/O modules are available in RTD/TC non-isolated or TC isolated versions.  The user can configure the RTD/TC non-isolated version to accept either TC or RTD, or a mixture of TC and RTD inputs. The TC isolated version provides 250 Vdc of channel-to-channel isolation to protect against external interference. When used in a Triple Modular Redundant (TMR) configuration, temperature monitors must be installed adjacent to each other in groups of three. When used in this configuration, the system employs two types of voting to ensure accurate operation and to avoid single-point failures.