Detcon 700 Series Remote Sensor/Alarm Relay Module With HART Interface - Manual (Page 5)

700 HART-RAM I.M.
1. Introduction
1.1 Description
The Model 700 Remote Sensor/Alarm Relay Module with HART Interface (known as the HART Remote
Alarm Module or HART-RAM) is sold separately as an accessory for Model 700 Series Gas Sensors. It is a
universal design and can be used with any of the Model 700 Gas Sensors. The HART-RAM is provided in
an explosion-proof junction box constructed of either epoxy-painted aluminum or 316 stainless steel and
includes a glass-viewing window.
Figure 1 700 HART-RAM
The HART-RAM performs three functions: 1) The first function is to set gas alarm levels and to configure
the three local relay contacts. 2) The second function is to provide a HART Interface to the Model 700 Gas
Sensor 3) The third function is to operate a Model 700 Gas Sensor remotely. The remote sensor function is
typically used when the sensor must be mounted in a position where it cannot be viewed or accessed readily.
All three functions can be used at the same time.
1.2 Installation
The HART-RAM can be installed as a wall mount or pipe mount using the mounting holes of the explosion-
proof junction box. It should be oriented such that the LED display is horizontal. If the 700 Gas Sensor is
mounted directly to the HART-RAM, use 0.5” spacers underneath the mounting holes to provide access
clearance for the 700 Gas Sensor (Figure 3).
NOTE: Block any unused ¾” NPT holes with the proper Plug. (Detcon P/N 8522-750)
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